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Chemistry FINAL
Question | Answer |
---|---|
Define physical change. | a substance changing from one state of matter to another. |
List 13 physical properties. | color, smell, freezing point, attraction, repulsion, magnets, opacity, density, viscosity, heat combustion, sublimation, acid resistance, length of metal object, magnetizing steel. |
Define chemical change. | A change in a substance that involves the rearrangement of the way the atoms are bonded. |
List 6 chemical properties. | heat combustion, reactivity with water, PH, electromotive force, reactivity, combustible. |
What are the two things a solid have | Definite shape and volume |
What are the two things liquids have | No definite shape but definite volume. |
What are the two things gases have | No definite shape no definite volume. |
What is Distillation? | Liquid to Gas to Liquid |
What is sublimation? | solid to gas to solid |
what is recrystallization? | solid to liquid to solid |
what is dissolution? | Involves a material (usually a solid) disappearing when placed into a liquid. Example sugar in water |
What is crystallization? | The reverse of dissolution. Example evaporating away the water to retrieve the sugar. |
What is recrystallization? | combing both processes. |
Time for the Atomic Theory Quiz. (turn to page two) | I'm already |
Non-metal to non-metal make what bond. | A coefficient bond. |
Metal to non-metal make what bond. | A Ionic bond. |
What makes a Isotope unique? | A Isotope has more/less number of neutrons in the atom so the mass of the atom will be different. |
What is the Isotope of carbon with 8 neutrons? | Carbon-14 |
list the three groups on the periodic table? | Metals, non-metals, and metalloids. |
What is the most reactive non-metal and metal groups. | Group 1 and group 17. |
When is the appropriate time to use brackets with charges. | When showing bonding through ions. |
What type of bond and how many connections does H4C2 have when bonded? | Ionic bond because of the single transfer of valence electrons and its a double bond between the carbon and a single with the hydrogen's. |
What type od bond and how many connections does H20 have when bonded? | Ionic bond and single bond. |
How many valence electrons are ____________ and how many connections does N2 have when bonded. | 3 valance electrons are shared and have a 3 bond connection. |
On the back of your atomic theory quiz we are going to do chemical equations. | ok |
CO + O2 = CO2 solve | *show you the paper 2CO + OS = 2CO2 |
NaNO3 = NaNO2 + O2 | *show you the paper 4NaNO3 = 3NaNO2 + O2 |
What is synthesis and give a example | two or more substances react to from a single substance. Ex): 2Na + 2Cl = 2NaCl |
What is decomposition and give a example | a compound breaks down into two more simpler substances. Ex): 2HO = H2 + O2 |
What is single replacement and give example | one element takes the place of another element in a compound Ex): A + BC = A +AC |
What is double replacement and give example | two element takes the place of another element in a compound. Ex): AB + CD = AD + CB |
What is combustion and give a example | Combustion is when all substances in the compound are combined with oxygen and produces carbon dioxide and water. Ex): AB + O2 = CO2 + H2O |
What is Avogadro's number and what does it help us find? | Avogadro's number is 6.02*10^23. this number is used to find the exact mass of the atom. |
What is the mol of Carbon and Hydrogen 2 | mol = 14 |
What is the difference between Endothermic and Exothermic? | Endothermic absorbs heat from its surroundings and Exothermic releases heat into its surroundings. |
What do temperature, particle size, pressure, stirring, concentration and catalyst have in common with rate of reaction. | All of these factors increase the rate of reaction. |
Fill this out on back of sheet | ok |
How many moles of CaCl2 are produced with 45g of calcium chlorine? | 45g CaCl2 * 1mole Cacl2/110g CaCl2 = 0.49 mol |
How many grams are in 2.4 moles of Sulfur? | 2.4 mol * 32gs/1m = 76.8grams |