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Pershing Chemistry 2
Pershing Chem Chpt 2
| Question | Answer |
|---|---|
| What things do we know about atoms? (how big, movement, where are they found, do they bump other atoms?) | They are tiny. They are always moving. They are found in everything. They bump into other atoms |
| How do the particles move in a gas? | quickly or fast |
| What kind of solid has particles in an orderly repeating pattern? | Crystalline solid |
| In what state are the particles packed close together and vibrate in place? | in a solid |
| What is different in maple syrup than in water? | its viscosity |
| What happens to the particles at higher temperatures? | the particles moved faster |
| Why can balloons be twisted into shapes? | the particles can be compressed or put in smaller areas |
| What does Charles's law tell us about the effect of temperature on the volume of a gas? | if you decrease the temperature, the volume decreases |
| Describe the particles in a volleyball that is under high pressure? | There are more particles and they are closer together. (if the pressure is decreased, there are less and the particles have more space |
| What does Boyle's law say? | in a gas, the volume of the gas is inversely related to pressure and the temperature does not change. |
| What is sublimation? | a substance going directly from a solid to a gas |
| What is vapor pressure? | pressure inside bubbles of boiling liquid |
| What is it called when a substance goes from a solid to a liquid? | melting |
| What is "change of state"? | the changing from one physical state to another |
| What is an endothermic change? | when energy is gained in a substance as it changes state |
| What is an exothermic change? | when energy is removed as a substance changes state |
| What is evaporation? | changing from liquid to a gas |
| What is it called when gas changes to a liquid? | condensation |
| What are the characteristics of the boiling state? | the changing of liquid to a gas throughout the liquid |
| What point is the same as the freezing point in water? | melting point |
| Why can someone smell something from across the room in a short period of time? | particles evaporate into the air |
| What is the opposite of evaporation? | condensation |
| What happens when the particles of dry ice gain energy? | an exothermic reaction takes place and the dry ice can enter the air |
| What happens in an exothermic change? | the substance looses energy and cools down |
| What is viscosity? | the resistance of a substance to flow |
| What state has a fixed volume but not a fixed shape? | a liquid |
| Describe the particles in a gas. | They are far apart and moving quickly |
| What is surface tension? | It describes the strength of the bonds between the molecules in a liquid. |
| The opposite of evaporation is... | condesation |
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ellist
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