Chapters 1 through 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| How many significant figures? 0.1111s | 4
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| How many significant figures? 0.03 mm | 1
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| How many significant figures? 108,700 km | ambiguous
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| How many significant figures? 25.3100 x 10^-3 s | 6
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| How many significant figures? 30,800 | ambiguous
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| Properties of iron: RUSTING in water. REACTING with chlorine to FORM iron chloride. | Chemical Properties
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| Properties of an ice cube: It is HARD. It is COLD to the touch. It has a MASS of 27.3 g. | Physical Properties
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| Element, Compound, or Mixture? --- argon, Ar | Element
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| Element, Compound, or Mixture? --- iron, Fe | Element
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| Element, Compound, or Mixture? --- carbon monoxide, CO | Compound
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| Element, Compound, or Mixture? --- salt, NaCl | Compound
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| Element, Compound, or Mixture? --- air | Mixture
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| Homogeneous or Heterogeneous? --- vodka | Homogeneous
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| Homogeneous or Heterogeneous? --- saltwater | Homogeneous
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| Homogeneous or Heterogeneous? --- bronze | Homogeneous
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| Homogeneous or Heterogeneous? --- fruit salad | Heterogeneous
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| Homogeneous or Heterogeneous? --- granite | Heterogeneous
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| The speed of light is 3.00 x 10^8 m/s. How fast is this in miles per hour (miles/h)? Use the conversion 1 mile = 1610 m. (hw page 4) | 6.71 x 10^8 miles/h
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| You have been told that a certain house is 164 m^2 in area. How much is this in square feet? Use the conversion 1ft = 0.305 m. (hw page 4) | 1760 ft^2
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| How many significant figures? 6.07 m | 3
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| How many significant figures? 0.0030 s | 2
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| Round the value 44.981 g to three significant figures: | 45.0 g
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| You wash dishes for a chem. lab to make extra money for laundry. You earn 6 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 6 quarters/load. --- How many shifts must you work if you wish to wash 10 loads of laundry? | 2 shifts
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| You wash dishes for a chem. lab to make extra money for laundry. You earn 6 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 6 quarters/load. --- How many loads of laundry can you wash if you work 3 shifts? | 15 loads
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| You wash dishes for a chem. lab to make extra money for laundry. You earn 6 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 6 quarters/load. --- How many loads of laundry will each shift pay for if the cost per load is 8 quarters? | 3 loads
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| Compute 3.5 x 4.48697 and round the answer appropriately: | 16
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| Compute 1240.64/12.5 and round the answer appropriately: | 99.3
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| Compute 9.3456 + 2140.56 and round the answer appropriately: | 2149.91
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| In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 20.0 mi/gal, how many liters of gas would you need to buy to complete a 142-km trip in Europe? -- 1 km = 0.6214 mi ; 1 gal = 3.78 L | 16.7 L
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| While in Europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 35.0 mi/gal? -- 1 euro = $1.26 | $81.40
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| A sprinter set a high school record in track and field, running 200.0 m in 21.7 s. What is the average speed of the sprinter in kilometers per hour? | 33.2 km/h
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| A specific brand of gourmet chocolate candy contains 7.00 g of dietary fat in each 22.7-g piece. How many kilograms of dietary fat are in a box containing 1.00 lb of candy? | 0.140 kg
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| The density of iron is 7.87 g/mL. What is the mass of a 4.00 cm x 4.00 cm x 1.00 cm block of iron? | 126 g
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| Physical Change or Chemical Reaction? -- Oxygen gas changes to ozone during thunderstorms: | Chemical Reaction
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| Physical Change or Chemical Reaction? -- Freezing rain develops when a warm air mass overrides a cold air mass: | Physical Change
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| Physical Change or Chemical Reaction? -- Carbon dioxide is produced by the combustion of gasoline in an automobile engine: | Chemical Reaction
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| Physical Change or Chemical Reaction? -- Fog forms from water vapor when the temperature drops below the dew point: | Physical Change
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| Physical Change or Chemical Reaction? -- Solid waste decomposes in landfills and produces methane gas: | Chemical Reaction
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| Rank the size of a change in temperature of 1 degree Fahrenheit, 1 degree Celsius, and one kelvin: | One Celsius degree = One kelvin ... smallest is One Fahrenheit degree
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| Convert the number 0.000127 to scientific notation: | 1.27 x 10^-4
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| Determine the answer to the following calculation: 10^-15/4.2 x 10^-7 | 2.38 x 10^-9
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| 4.3 x 10^-6 is between which two numbers? | 1 x 10^-5 and 1 x 10^-6
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| What is equal to 5 x 10^10? | 0.5 x 10^11 ... 50 x 10^9 ... 500 x 10^8
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| Intensive Properties or Extensive Properties? -- Gold begins to melt at 1064 degrees Celsius: | Intensive Property
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| Intensive Properties or Extensive Properties? -- Gold is lustrous yellow in color: | Intensive Property
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| Intensive Properties or Extensive Properties? -- Gold has a density of 19.3 g/mL: | Intensive Property
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| Intensive Properties or Extensive Properties? -- Gold has a mass of 82.6 g: | Extensive Property
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| Intensive Properties or Extensive Properties? -- Gold has a volume of 4.28 mL: | Extensive Property
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| You are given a sample resembling gold. What could be used to help determine whether the sample is really gold? | The DENSITY of the sample; the MELTING POINT of the sample.
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| Intensive Properties are... | INDEPENDENT of the amount of the sample.
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| Extensive Properties are... | VARIES with the amount of the sample.
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| Pure Chemical Substances can... | Be further divided into ELEMENTS or COMPOUNDS.
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| Mixtures can be... | Either HETEROGENEOUS or HOMOGENEOUS.
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| Homogeneous Mixtures are... | Also called SOLUTIONS.
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| A sample of tap water consists of water, fluoride ions, calcium ions, and several other dissolved ions. The ions are evenly distributed throughout the water. Which terms could be used to describe this sample of tap water? | Mixture; Homogeneous Mixture; Solution
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| A sample is composed completely of gold, absolutely free of impurities. Which terms could be used to describe this sample? | Pure Chemical Substance; Element
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| A blood sample contains several different types of cells, which contain different combinations of specific ions and molecules. The cells are suspended in water, which also contains many molecules and ions. Which terms describe this sample? | Mixture; Heterogeneous Mixture
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| A balloon is filed with pure carbon dioxide. Which terms could be used to describe the contents of this balloon? | Pure Chemical Substance; Compound
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| A particular brand of gasoline has a density of 0.737 g/mL at 25 degrees Celsius. How many grams of this gasoline would fill a 14.2 gal tank? -- 1 gal = 3.78 L | 3.96 x 10^4 g
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| A block of metal has a width of 3.2 cm, a length of 17.1 cm, and a height of 4.5 cm. Its mass is 1.5 kg. Calculate the density of the metal. -- 1000 g = 1 kg | 6.1 g/cm^3
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| What is the weight, in pounds, of a 195-kg object in Jupiter? -- W = mass x gravity .. 1 lb = 0.454 kg | 1010 lbs
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| Which subatomic particle(s) are found in the nucleus of the atom? | Protons, Neutrons
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| The atomic number of oxygen is 8. What is the mass number of an oxygen atom with 7 neutrons? | 15
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| An atoms has a mass number of 25 and 13 neutrons. What is the atomic number of this atom? | 12
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| An atom of sulfur is represented by 33/16 S. How many neutrons are in the nucleus of this atom? | 17
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| Give the nuclear symbol for the isotope of silicon (Z=14) for which A=29? | 29/14 Si
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| The atomic number ... | is represented by "Z", and it is the number of protons in the nucleus.
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| The mass number ... | is represented by "A", and it is the sum of protons and neutrons in the nucleus.
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| Law of Definite Proportions | Applies to 2 or more samples of the same compound and states that the ratio of one element to the other in the samples will always be the same.
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| Law of Multiple Proportions | Applies to two different compounds containing the same 2 elements (A and B) and states that the masses of B that combine with 1g of A are related as a small whole number ratio.
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| What defines and element? | The number of protons in the nucleus.
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| Explain the difference between Z (atomic number) and A (mass number): | Z-is the number of protons in an atom's nucleus. A-is the sum of the neutrons and protons in an atom.
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| What is an ion? | A charged particle
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| What is a cation? | A POSITIVELY charged ion
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| What is an anion? | A NEGATIVELY charged ion
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| A car gas tank holds 21 kg of gas. When the gas burns, 86 kg of oxygen is consumed and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide and water that is produced? | 107 kg
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| 2 samples of NaCl were decomposed into their constituent elements. SAMPLE 1: 6.98 g Na & 10.7 g Cl .. SAMPLE 2: 11.2 g Na & 17.3 g Cl .. Are these results consistent with the law of definite proportions? | Yes
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| Decomposition of a sample of sulfur hexafluoride produced 4.48 g of fluorine & 1.27 g of sulfur. Calculate the mass of fluorine per gram of sulfur for the sample of sulfur hexafluoride: | 3.53 g fluorine/1 g sulfur
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| Decompostion of a sample of sulfur tetrafluoride produced 4.42 g of fluorine & 1.88 g of sulfur. Calculate the mass of fluorine per gram of sulfur for the sample of sulfur tetrafluoride: | 2.35 g fluorine/1 g sulfur
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| Protons and electrons have charges of the same magnitude but opposite sign: | True
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| Protons have about the same mass as neutrons: | True
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| Some atoms don't have any protons: | False
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| Protons and neutrons have charges of the same magnitude but opposite sign: | False
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| A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass of a helium nucleus? | 7300 electrons
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| 39/19 K .. Protons and neutrons? | 19 protons; 20 neutrons
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| 222/87 Fr .. Protons and neutrons? | 87 protons; 135 neutrons
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| 96/42 Mo .. Protons and neutrons? | 42 protons; 54 neutrons
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| 33/15 P .. Protons and neutrons? | 15 protons; 18 neutrons
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| Symbol for the following element: tin | Sn
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| Symbol for the following element: neon | Ne
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| Symbol for the following element: potassium | K
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| Symbol for the following element: gold | Au
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| Symbol for the following element: xenon | Xe
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| Metal, Nonmetal, or Metalloid? -- tin | Metal
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| Metal, Nonmetal, or Metalloid? -- potassium | Metal
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| Metal, Nonmetal, or Metalloid? -- gold | Metal
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| Metal, Nonmetal, or Metalloid? -- neon | nonmetal
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| Metal, Nonmetal, or Metalloid? -- xenon | nonmetal
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| Alkali Metal, Alkaline Earth Metal, Halogen, or Noble Gas? -- Fr | Alkali Metal
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| Alkali Metal, Alkaline Earth Metal, Halogen, or Noble Gas? -- Sr | Alkaline Earth Metal
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| Alkali Metal, Alkaline Earth Metal, Halogen, or Noble Gas? -- F | Halogen
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| Alkali Metal, Alkaline Earth Metal, Halogen, or Noble Gas? -- At | Halogen
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| Alkali Metal, Alkaline Earth Metal, Halogen, or Noble Gas? -- Ne | Noble Gas
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| Bromine has 2 naturally occurring isotopes (Br-79 & Br-81) w/ an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu, & its natural abundance is 49.31% Calculate the mass of Br-79 | 78.92 amu
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| Bromine has 2 naturally occurring isotopes (Br-79 & Br-81) w/ an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu, & its natural abundance is 49.31% Calculate the natural abundance of Br-79 | 50.69%
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| What is the mass, in grams, of: 2.0 x 10^-3 mol Sb | 0.24 g
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| What is the mass, in grams, of: 3.58 x 10^-2 mol Ba | 4.92 g
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| What is the mass, in grams, of: 44.3 mol Xe | 5820 g
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| What is the mass, in grams, of: 1.5 mol W | 2.8 x 10^2 g
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| What is the mass of 5.08 x 10^21 platinum atoms? | 1.65 g
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| Calculate the mass, in grams, of: 1.4 x 10^23 gold atoms | 46 g
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| Calculate the mass, in grams, of: 2.90 x 10^22 helium atoms | 0.193 g
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| Calculate the mass, in grams, of: 1.4 x 10^23 lead atoms | 48 g
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| Calculate the mass, in grams, of: 7.8 x 10^21 uranium atoms | 3.1 g
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| The ratio of sulfur to oxygen by mass in SO2 is 1.0:1.0 -- Find the ratio of sulfur to oxygen by mass in SO3 | 1.0:1.5
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| The ratio of sulfur to oxygen by mass in SO2 is 1.0:1.0 -- Find the ratio of sulfur to oxygen by mass in S^2O | 4.0:1.0
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| Periodic Table -- Group 1A (tendency and charge): | LOSES one electron; +1 charge
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| Periodic Table -- Group 2A (tendency and charge): | LOSES two electrons; +2 charge
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| Periodic Table -- Group 3A (tendency and charge): | LOSES three electrons; +3 charge
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| Periodic Table -- Group 5A (tendency and charge): | GAINS three electrons; -3 charge
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| Periodic Table -- Group 6A (tendency and charge): | GAINS two electrons; -2 charge
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| Periodic Table -- Group 7A (tendency and charge): | GAINS one electron; -1 charge
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| Periodic Table -- Group 8A (tendency and charge): | Rarely gains/loses electrons; 0 charge
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| If "Be" were to form ions, it would attain the same number of electrons as which noble gas? | He
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| If "N" were to form ions, it would attain the same number of electrons as which noble gas? | Ne
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| If "Mg" were to form ions, it would attain the same number of electrons as which noble gas? | Ne
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| If "Al" were to form ions, it would attain the same number of electrons as which noble gas? | Ne
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| If "S" were to form ions, it would attain the same number of electrons as which noble gas? | Ar
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| If "Br" were to form ions, it would attain the same number of electrons as which noble gas? | Kr
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| If "Se" were to form ions, it would attain the same number of electrons as which noble gas? | Kr
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| A certain element forms an ion with 54 electrons and a charge of +2. Identify the element: | Ba
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| How many neutrons are found in one atoms of 40 K? | 21 neutrons
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| The two isotopes of chlorine are 35/17 Cl and 37/17 Cl. Which isotope is the most abundant? | 35/17 Cl
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| Specify the number of protons, neutrons, and electrons in the neutral atom bromine-80 | 35 protons, 45 neutrons, 35 electrons
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| The ion O^2- has __ protons and __ electrons: | 8 protons; 10 electrons
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| What isotope has 13 protons and 14 neutrons? | Aluminum-27
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| Which element does X represent in the following expression: 41/20 X | Ca
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| Group 1 (name and properties) | Alkali Metals .. React to form 1+ ions.
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| Group 2 (name and properties) | Alkaline Earths .. React to form 2+ ions.
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| Group 17 (name and properties) | Halogens .. React to form 1- ions.
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| Group 18 (name and properties) | Rare Gases (noble gases) .. Stable and unreactive (elements from other groups form ions to achieve the same number of electrons as a noble gas).
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| What is the atomic number of the element located in group 16, period 2 of the periodic table? | 8
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| If a new element were discovered and it was found to form 1- ions, in which group would you place it in the periodic table? | 17
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| Phosphorus, metal? | No!
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| Water, element? | No!
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| Main Group Element, Transition Metals, or Inner Transition Metals? -- Ca | Main Group Elements
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| Main Group Element, Transition Metals, or Inner Transition Metals? -- Pb | Main Group Elements
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| Main Group Element, Transition Metals, or Inner Transition Metals? -- O | Main Group Elements
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| Main Group Element, Transition Metals, or Inner Transition Metals? -- Fe | Transition Metals
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| Main Group Element, Transition Metals, or Inner Transition Metals? -- Ag | Transition Metals
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| Main Group Element, Transition Metals, or Inner Transition Metals? -- U | Inner Transition Metals
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| Halogens, Alkali Metals, Alkaline Earth Metals, or Noble Gases? -- Br | Halogens
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| Halogens, Alkali Metals, Alkaline Earth Metals, or Noble Gases? -- I | Halogens
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| Halogens, Alkali Metals, Alkaline Earth Metals, or Noble Gases? -- Li | Alkali Metals
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| Halogens, Alkali Metals, Alkaline Earth Metals, or Noble Gases? -- K | Alkali Metals
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| Halogens, Alkali Metals, Alkaline Earth Metals, or Noble Gases? -- Mg | Alkaline Earth Metals
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| Halogens, Alkali Metals, Alkaline Earth Metals, or Noble Gases? -- Ne | Noble Gases
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| Period 1,2,3,4,5,6 or 7? -- H | Period 1
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| Period 1,2,3,4,5,6 or 7? -- F | Period 2
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| Period 1,2,3,4,5,6 or 7? -- Al | Period 3
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| Period 1,2,3,4,5,6 or 7? -- Cr | Period 4
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| Period 1,2,3,4,5,6 or 7? -- Sr | Period 5
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| Period 1,2,3,4,5,6 or 7? -- Au | Period 6
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| Period 1,2,3,4,5,6 or 7? -- Fr | Period 7
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| Metal, Nonmetal, or Semimetal? -- Mn | Metal
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| Metal, Nonmetal, or Semimetal? -- Na | Metal
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| Metal, Nonmetal, or Semimetal? -- O | Nonmetal
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| Metal, Nonmetal, or Semimetal? -- Kr | Nonmetal
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| Metal, Nonmetal, or Semimetal? -- Si | Semimetal
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| Metal, Nonmetal, or Semimetal? -- B | Semimetal
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| What is the ratio of hydrogen atoms (H) to oxygen atoms (O) in 2 L of water? Enter the simplest whole number ratio in order of hydrogen to oxygen. | 2,1
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| How many atoms of hydrogen (H) are present in 200 molecules of ammonia (NH3)? | 600 H atoms
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| A solution of ammonia and water contains 3.40x10^25 water molecules and 7.40x10^24 ammonia molecules. How many total hydrogen atoms are in this solution? | 9.02 x1 0^25 H atoms
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| There are 2 different compounds of sulfur and fluorine. In SF6, the mass of fluorine per gram of sulfur is 3.55g. In the other compound, SFx, the mass of fluorine per gram of sulfur is 1.18g. What is the value of X for the second compound? | 2
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| Is N2+O2-->2NO possible according to Dalton's Atomic Theory? | Yes! Atoms rearrange but they do not change their identities.
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| Magnesium oxide decomposes into magnesium and oxygen. If 12.09 g of magnesium oxide decomposes to form 7.29 g of magnesium, what mass of oxygen gas is also released in the reaction? | 4.80 g
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| Adrenaline contains 13 hydrogen atoms, 9 carbon atoms, 3 oxygen atoms, and 1 nitrogen atom. What is the chemical formula for adrenaline? | C9H13NO3
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| A certain compound is made up of two fluorine atoms, one chlorine atom, and one phosphorus atom. What is the chemical formula of this compound? | PClF2
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| Calcium chloride contains only calcium and chlorine. What is the formula for this compound? | CaCl2
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| What is the name of the acid whose formula is HI? | hydroiodic acid
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| What is the formula for chlorous acid? | HClO2
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| CaSO4 + AlCl3 --> CaCl2 + Al(SO4)3 ... What number should be placed in front of CaSO4 in order to give the same total number of sulfate ions on each side of the equation? | 3
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| 3CaSO4 + AlCl3 --> CaCl2 + Al(SO4)3 ... now that we've added the 3, what coefficient should go in front of CaCl2 to balance calcium? | 3
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| 3CaSO4 + AlCl3 --> 3CaCl2 + Al(SO4)3 ... Now that we've added the coefficients, what coefficient should go in front of AlCl3 to balance both the Cl atoms and the Al atoms? | 2 ... final balanced equation: 3CaSO4 + 2AlCl3 --> 3CaCl2 + Al(SO4)3
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| What is the name of the base that has the formula Mg(OH)2? | magnesium hydroxide
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| What is the chemical formula for the base sodium hydroxide? | NaOH
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| Is HCl a base? | No!
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| How many covalent bonds does carbon form in neutral compounds? | 4
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| How many covalent bonds does oxygen form in electrically neutral compounds? | 2
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| How many covalent bonds does nitrogen form in electrically neutral compounds? | 3
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| How many covalent bonds does hydrogen form in electrically neutral compounds? | 1
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| Covalent Bonds occur: | between two nonmetal atoms. The resulting cluster of atoms is called a molecule, and the compound is considered to be molecular.
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| Ionic Bonds occur: | between a metal and a nonmetal atom.
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| Ionic or Molecular? -- CO | Molecular
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| Ionic or Molecular? -- HCl | Molecular
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| Ionic or Molecular? -- SO | Molecular
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| Ionic or Molecular? -- NaI | Ionic
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| Ionic or Molecular? -- KF | Ionic
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| Ionic or Molecular? -- MgO | Ionic
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| Ionic or Molecular? -- KCl | Ionic
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| Ionic or Molecular? -- CaS | Ionic
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| Covalent or Ionic Bond? -- carbon dioxide | Covalent
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| Covalent or Ionic Bond? -- dinitrogen trioxide | Covalent
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| Covalent or Ionic Bond? -- calcium chloride | Ionic
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| Covalent or Ionic Bond? -- magnesium nitride | Ionic
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| Covalent or Ionic Bond? -- sodium bromide | Ionic
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| Covalent or Ionic Bond? -- aluminum oxide | Ionic
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| Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction: __H3PO4 + __Mg(OH)2 --> __Mg3(PO4)2 + __H2O .. Balance the equation: | 2H3PO4 + 3Mg(OH)2 --> Mg3(PO4)2 + 6H2O
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| You carefully weight out 11.00 g of CaCO3 powder and add it to 44.55 g of HCl solution. You notice air bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 51.04 g. What mass of CO2 was produced? | 4.51 g
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| Quartz, contains one silicon atom and two oxygen atoms per formula unit. What is the chemical formula for quartz? | SiO2
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| How many oxygen atoms are in 2.80 g of quartz? | 5.62 x 10^22
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| What is the formula for the compound nitrogen monoxide? | NO
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| What is the formula for the compound tetraphosphorus decoxide? | P4O10
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| What is the formula for the compound methane? | CH4
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| What is an empirical formula? | It expresses the simplest ratio of the elements involved.
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| What is the empirical formula for the compound P4O6? | P2O3
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| A compound is 80.0% carbon & 20.0% hydrogen by mass. Assume a 100 g sample of this compound. How many grams of each element are in this sample? | mass of C = 80.0 g ... mass of H = 20.0 g
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| A compound is 80.0% carbon & 20.0% hydrogen by mass. Assume a 100 g sample of this compound. How many moles of each element are in this sample? | moles of C = 6.66 mol ... moles of H = 19.8 mol
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| moles of C = 6.66 mol ... moles of H = 19.8 mol ----- Based on this information, what is the empirical formula of this compound? | CH3
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| Ionic or Molecular Compound? -- KMnO4 | Ionic
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| Ionic or Molecular Compound? -- Cr2O3 | Ionic
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| Ionic or Molecular Compound? -- ClO2 | Molecular
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| Ionic or Molecular Compound? -- NI3 | Molecular
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| Formula for the compound that forms between lithium and carbonate: | Li2CO3
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| Formula for the compound that forms between lithium and phosphate: | Li3PO4
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| Formula for the compound that forms between lithium and hydrogen phosphate | Li2HPO4
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| Formula for the compound that forms between lithium and acetate: | LiC2H3O2
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| Formula for potassium chloride: | KCl
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| Formula for iron(II) iodate: | Fe(IO3)2
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| Formula for iron(III) chromate: | Fe2(CrO4)3
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| Formula for potassium fluoride: | KF
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| Formula for potassium hydroxide: | KOH
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| Formula for iron(II) phosphate: | Fe3(PO4)2
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| Name NO2: | nitrogen dioxide
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| Name XeF8: | xenon octafluoride
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| Name RnF2: | radon difluoride
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| Name Si3N4: | trisilicon tetranitride
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| Name SCl2: | sulfur dichloride
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| Name the acid: HClO4 | perchloric acid
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| Name the acid: HClO2 | chlorous acid
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| Name the acid: H2SO4 | sulfuric acid
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| Name the acid: HI | hydroiodic acid
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| Formula for the acid: chromic acid | H2CrO4
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| Formula for the acid: hydrocyanic acid | HCN
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| Formula for the acid: perchloric acid | HClO4
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| Calculate the mass (in grams) for: 5.56 x 10^20 SO3 molecules | 7.39 x 10^-2 g
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| Calculate the mass (in grams) for: 3.2 x 10^22 H2O molecules | 0.96 g
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| Calculate the mass (in grams) for: 4.7 x 10^25 O3 molecules | 3700 g
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| Calculate the mass (in grams) for: 9.69 x 10^19 CCl2F2 molecules | 1.95 x 10^-2 g
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| Calculate the mass (in grams) of a single chitin molecule (C8H13O5N) | 3.375 x 10^-22 g
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| A salt crystal has a mass of 0.16 mg. How many NaCl formula units does it contain? | 1.6 x 10^18
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| Iron is mined from the earth as iron ore. Common ores are Fe2O3 (hematite), Fe3O4 (magnetite), and FeCO3 (siderite). Calculate the mass percentage composition of iron for the first one of these iron ores: | 69.9%
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| Iron is mined from the earth as iron ore. Common ores are Fe2O3 (hematite), Fe3O4 (magnetite), and FeCO3 (siderite). Calculate the mass percentage composition of iron for the second one of these iron ores: | 72.4%
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| Iron is mined from the earth as iron ore. Common ores are Fe2O3 (hematite), Fe3O4 (magnetite), and FeCO3 (siderite). Calculate the mass percentage composition of iron for the third one of these iron ores: | 48.2%
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| Iron is mined from the earth as iron ore. Common ores are Fe2O3 (hematite), Fe3O4 (magnetite), and FeCO3 (siderite). Which ore has the highest iron content? | magnetite
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| The ADA recommends that an adult female should consumer 3.0 mg of fluoride (F-) per day to prevent tooth decay. If the fluoride is consumed as sodium fluoride (45.24% F), what amount of sodium fluoride contains the recommended amount of fluoride? | 6.6 mg
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| Determine the number of moles of oxygen atoms in: 4.98 mol H2O2 | 9.96 mol
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| Determine the number of moles of oxygen atoms in: 2.18 mol N2O | 2.18 mol
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| Determine the number of moles of oxygen atoms in: 2.16 x 10^-2 mol H2CO3 | 6.48 x 10^-2 mol
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| Determine the number of moles of oxygen atoms in: 26.0 mol CO2 | 52.0 mol
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| When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide. Write a balanced chemical equation for this reaction. | 4Fe(s) + 3O2(g) --> 2Fe2O3(s)
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| Name the hydrate MgSO4*7H2O | magnesium sulfate heptahydrate
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| If 24.0 g of MgSO4*7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain? | 11.7 g
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| What is the chemical formula for potassium permanganate? | KMnO4
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| Blue vitrol is commonly used in industrial dyeing processes. What is the chemical formula for blue vitrol, whose systematic name is copper(II) sulfate? | CuSO4
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| Sodium carbonate is used in the manufacture of paper. What is the chemical formula for this compound? | Na2CO3
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| Give the systematic name for the compound Al(NO3)3 | aluminum nitrate
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| Give the systematic name for the compound Fe2(SO4)3 | iron(III) sulfate
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| Write the formula for the compound magnesium oxide: | MgO
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| Write the formula for the compound lead(II) phosphate: | Pb3(PO4)2
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| What is the name for the compound CCl4? | carbon tetrachloride
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| What is the name for the compound P4O10? | tetraphosphorus decoxide
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| What is the name of the covalent compound CCl4? | carbon tetrachloride
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| What is the name of the covalent compound N2O5? | dinitrogen pentaoxide
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| What is the systematic name of Mg(NO3)2? | magnesium nitrate
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| What is the systematic name of NH4ClO3? | ammonium chlorate
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| What is the systematic name of PbO? | lead(II) oxide
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| A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100-g sample of this compound. What are the subscripts in the empirical formula for this compound? | C = 1 ; H = 2 ; O = 1
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| A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100-g sample of this compound. The molecular formula mass of this compound is 120 amu. What are the subscripts in the actual molecular formula? | C = 4 ; H = 8 ; O = 4
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| Calculate the empirical formula for the compound: 0.294 g Li , 5.381 g I | LiI
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| Calculate the empirical formula for the compound: 2.677 g Ba , 3.115 g Br | BaBr2
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|
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| Calculate the empirical formula for the compound: 10.838 g Na , 7.557 g S , 15.107 g O | Na2SO4
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|
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