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chemistry unit test
| Question | Answer |
|---|---|
| List and explain chemical properties: | the ability to change (react) and form a new substance |
| 3. What are the names for the three subatomic particles and what are their respective charges? | electrons = negative protons = positive neutrons = neutral |
| What two important pieces of information can be extrapolated from the atomic number: | protons and electrons |
| 7. How did Mendeleev organize the periodic table? | by atomic mass |
| 8. Identify which properties are common to each of the following chemical families? What group do the following families belong to and how many electrons are found in their valence shells. b) Alkaline earth metals | Group 2. 2+ electron. Never uncombined in nature. |
| 8. Identify which properties are common to each of the following chemical families? What group do the following families belong to and how many electrons are found in their valence shells. c) Halogen family | group 7 17 1- electron most active non metal, free in nature, react with alkali metals to form salts |
| 10. Where on the periodic table would you find a: i. metal: ii. non-metal: iii. metalloid: | left right side of staircase along the stair step (B, Si, Ge, As, Sb, Fe, Po) |
| Explain how an atom is neutral? What needs to be balanced? | neutral when the same elections and protons. needs to be balanced to keep itself stable. |
| What is a molecular element? Give 3 examples. | a molecule consisting of the same element ex: o2, n2, cl2 |
| What is an ionic compound? Give 3 examples. | an ionic compound exists of positively and negatively charged ions ex: NaCl, MgO, CaClâ‚‚ |
| What is the name of a positive particle? | cation |
| What is the name of a negative particle? | anion |
| Explain how an atom becomes a positive OR negative ion. What type of element would have an positive OR negative charge? | positive- loses elections negative- gains elections |
| What is a diatomic molecule? List The 7 diatomic molecules. | a molecule of only 2 atoms |
| Define ion | |
| Define element | |
| Define compound | |
| Define isotope | |
| Define valance shell | |
| Define molecular compound | |
| Define ionic compound | |
| Define molecular (covalent) bond | |
| Define ionic bond | |
| 3 different test tubes containing hydrogen, oxygen, carbon dioxide are not labeled. How could you figure out which gas is in each of test tubes? | |
| The mass of a sample of gold is 11.7 g. The volume is 9.2 cm3. What is the density of the gold? (show all of your work using the GRASP method). | |
| 8. Identify which properties are common to each of the following chemical families? What group do the following families belong to and how many electrons are found in their valence shells. b) Alkaline metals | |
| colums of element are called families. what are 2 |
Created by:
Nicole224L