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Unit 2 Science
Phase Change
| Question | Answer |
|---|---|
| What has a definite shape and volume? | solid |
| What takes the shape of its container but has NO definite shape or volume? | liquid |
| A ____ has no definite shape or volume | gas |
| A very high-energy, gas-like state with an electrical charge is called ______. | plasma |
| What two phases do melting involve? Is energy added or removed? | solid to liquid, added |
| What two phases do freezing involve? Is energy added or removed? | liquid to solid, removed |
| What two phases do condensation involve? Is energy added or removed? | gas to liquid, removed |
| What two phases do sublimation involve? Is energy added or removed? | solid to gas, added |
| What two phases do deposition involve? Is energy added or removed? | gas to solid, removed |
| What two things make up matter? | space and mass |
| What is mass a measure of? | how much something weighs |
| What is an element? An example? | A pure substance that can not be separated into anything simpler physically or chemically, hydrogen |
| What is a compound? | is a pure substance that has two or more elements that are chemically bonded. |
| A mixture that looks the same throughout is called a ____ mixture. Give an example. | homogeneous, sugar, soda, air |
| A mixture that DOESN'T look the same throughout is called a ____ mixture. Give an example. | heterogeneous, salad, cereal with milk |
| Atoms can achieve stability by _______ or _______. | losing a valence electron(s) or gaining valence electrons(s) |
| A covalent bond is when atoms ____ electrons while an ionic bond is when electrons are _____. | share, transferred |
| Viscosity is.... | a liquids resistance to flow |
| Which has a higher viscosity, maple syrup or water and why? | Maple syrup, the molecules are more dense and they move more slowly |
| A crystalline solid has its particles arranged in a rigid pattern. Wax is an example of this. (T or F) | False, salt |
| An amorphous solid has particles arranged _______. An example of this is ______ | randomly, wax |
| What is condensation? | The process of gas cooling and changing phases into a liquid. |
| How are a solid's particles arranged? | compact |
| How are a liquid's particles arranged? | loosely spread out |
| How are a gases particles arranged? | very spread out |
| What is the difference between a compound and a molecule? | an compound has to have different elements chemically bonded while a molecule can have the same or different elements chemically bonded. |
| What is a molecule? | is composed of two or more (same or different) elements that are joined by chemical bonds. |
| How many electrons should an element with 3 valence electrons gain or lose? | lose 3 valence electrons |
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