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Chemistry
Don't forget to study those terms! ;)
| Question | Answer |
|---|---|
| What is a significant figure? | Those digits that carry meaning and contribute to the precision of a measurement. |
| What is the mass of Earth in scientific notation? | 5.98x10^24 kg |
| What is the mass of one electron in scientific notation? | 9.1x10^-31 kg |
| What is it called when one substance breaks down into two or more simpler substances? | Decomposition |
| What is it called when one element replaces another in a compound? | Single Displacement |
| When does neutralization occur? | When a solution of an acid and a base are mixed. |
| What happens when a metal undergoes corrosion? | It loses electrons to form cations. |
| What does it mean to be oxidized? | Loss of electrons. |
| What does it mean to be reduced? | Gain of electrons. |
| Do nonmetals usually have negative or positive oxidation numbers? | Negative. |
| What does aqueous mean? | Dissolved in water. |
| True or False? The number of elements can be balanced by changing coefficients of compounds. | True. |
| True or False? The same number of elements must ONLY exist before a reaction. | False. The same number of elements must exist before AND after a reaction. |
| What do we call a well-defined example of a chemical change? | A chemical reaction. |
| What is the smallest whole number ratio of elements in a compound? | Empirical Formula. |
| What is density? | Mass per unit volume. |
| What is the SI unit for temperature? | Kelvin or K. |
| 100 degrees Celsius is equivalent to how many degrees Fahrenheit? | 212 degrees Fahrenheit. |
| What degree in Celsius does water freeze? | 0 degrees Celsius. |
| What degree in Celsius does water boil? | 100 degrees Celsius. |
| What is mass? | The amount of matter in an object. |
| What is an exact quantity people agree to use for comparison? | A standard. |
| What is volume? | The amount of space occupied by an object. |
| True or False? Oxyacids contain oxygen. | True. |
| What does a chemical formula indicate? | The elements in a compound and the ratio of those elements. |
| What is a chemical bond? | A force that holds atoms together in a compound. |
| In a(n) ______ electrons are transferred, creating opposite charges that attract. | Ionic bond. |
| What kinds of bonds usually occur between elements at opposite ends of the periodic table? | Ionic bonds. |
| A negative ion is also referred to as | Anion. |
| A positive ion is also referred to as | Cation. |
| What is an ion? | An atom that has gained or lost electrons. |
| What is a shorthand method of showing the number of valence electrons? | Electron dot structure. |
| What are the rows on the periodic table called? | Periods. |
| Define ductile. | Can be drawn into wires. |
| What do we call something that can be easily bent or pounded into sheets? | Malleable. |
| What do we call the elements that are found along the "stair steps" line of the periodic table? | Metalloids. |
| What famous Russian Chemist designed the first periodic table? | Dimitri Mendeleev. |
| What famous English scientist developed the modern periodic table in 1913 and based the position of the elements on their atomic numbers? | Mosely. |
| What are the columns on the periodic table called? | Groups or Families. |
| True or False? Elements in a group have similar properties. | True. |
| True or False? The group number indicates the number of atoms. | False. The group number indicates the number of valence electrons. |
| Define allotrope. | The same element or isotope with a different formation. |
| What is the amount of time is takes for half of a sample of an isotope to break down into other elements? | Half-life. |
| What are electrons in an outer level or sub-level that are involved in reactions called? | Valence electrons. |
| What makes up protons and neutrons? | Quarks. |
| What famous scientist won two Nobel Prizes in chemistry and coined the term "Radiation"? | Marie Curie. |
| What famous scientist discovered the neutron in 1932? | James Chadwick. |
| Define Chemistry. | A science that deals with the materials of the Universe and the changes that these materials undergo. |
| How many known elements are arranged in the periodic table? | 118. |
| How many known elements occur naturally? | 88. |
| What are the smallest units of elements with properties of the element? | Atoms. |
| What are the two most abundant elements in the Universe? | Hydrogen and Helium. |
| What is the element symbol of Copper? | Cu. |
| What is the element symbol of Magnesium? | Mg. |
| What is the element symbol of Sodium? | Na. |
| What is the element symbol of Potassium? | K. |
| What is the element symbol of Iron? | Fe. |
| Name this element: Ni | Nickel. |
| Name this element: Zn | Zinc. |
| Name this element: B | Boron. |
| Name this element: Ar | Argon. |
| Name this element: He | Helium. |
| Name this element: Co | Cobalt. |
| What is the element symbol of Phosphorus? | P. |
| What is the element symbol of Gold? | Au. |
| Name this element: Hg | Mercury. |
| Name this element: Sn | Tin. |
| What is the element symbol of Silver? | Ag. |
| What charge does Oxygen have? | -2 |
| What charge does Hydrogen have? | +1 |
| What charge does Aluminum have? | +3 |
| What charge does Sulfur have? | -2 |
| What is the BEST CLASS EVER?! | CHEMISTRY! |
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