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Chemistry 3
Chemistry Test
| Question | Answer |
|---|---|
| Why do chemical reactions occur? | Atoms want to be stable and need a full outer shell to become stable. |
| What is a homogeneous mixture? Give an example. | A mixture in which the different materials appear to be the same (state, shape, size) making it difficult to tell them apart. An example is salt water. |
| What is a heterogeneous mixture? Give an example. | A mixture in which the materials appear to be different (state, shape, size). An example is cereal and milk. |
| What is an ionic bond? | a bond that is created from the transfer of one or more electrons from one atom over to the next atom |
| What is a covalent bond? | when atoms share electrons |
| What is a compound? | A substance made of two or more different kinds of atoms that are chemically bonded together |
| Can compounds be separated by a physical process? Explain. | No. Compounds cannot be separated by a physical process because they are chemically bonded. |
| Define physical properties | can be observed or measured without changing the composition of matter. |
| Give three examples of physical properties. | change of state, malleability (capable of being shaped or formed), luster, conductivity, shape, size, texture, color, boiling point, solubility, and many others. |
| Define chemical properties. | describes the potential to undergo some chemical change or reaction |
| What is always true about chemical changes? | Something new is being formed by bonds being formed or broken. |
| Give an example of chemical properties. | Flammable, reactive |
| What do families or groups tell us about the element? | The number of valence electrons |
| What are valence electrons? | The number of electrons in the outer shell |
| What do periods tell us about the element? | the number of shells the element has |
| Where are families or groups on the periodic table? | Columns |
| Where are the periods located on the periodic table? | Rows |
| Know how to write chemical formulas for compounds | Remember that + means the element wants to give an electron(s) and - means the element wants to take an electron(s) refer to page 67 |
| What is the conservation of matter? | matter cannot be created or destroyed (pg 72) |
| Define an element. Give an example. | A substance made up of all the same atoms (found on periodic table). An example is gold. |
| Define solution.Give an example. | A mixture in which a solid has dissolved in. Am example is Kool-Aid. |
| Define mixture.Give an example. | A collection of substances that are NOT bonded together. An example is air. |
| Know how to identify the number of atoms in a compound. | refer to page 47 and 59 |
| Know how to identify the number of elements in a compound. | count the number of capital letters |
| What is a polyatomic ion bond? | A compound that has both ionic and covalent bonds |
| The metals are to the ___________ of the stair step. | left |
| The nonmetals are to the ___________ of the stair step. | right |
| In general, when a metal bonds with a nonmetal, it forms what type of bond? | ionic |
| In general, when a nonmetal bonds with a nonmetal, it forms what type of bond? | covalent |
| Be able to draw a Bohr's diagram to represent an element. | page 50-51 |
| Know how to balance chemical equations. | Remember that the reactants needs to be balanced with the products (same number of atoms need to be on each side; conservation of matter). Refer to pages 73-75, 77 |
Created by:
kallayj
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