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Chpt 9 Les.3 Science
| Question | Answer |
|---|---|
| Most matter can be found in what 3 states? | solid, liquid, gas |
| What is the measure of the average amount of kinetic energy of the atoms/molecules in a material? | temperature |
| Temperature measures what type of energy? | kinetic energy |
| Where is the kinetic energy that is measured as temperature found? | in the atom/molecules in the materia; |
| What is needed to change a state of matter? | energy |
| When a substance goes from a solid to a liquid to a gas what must the substance do with the energy to make this happen? | it must absorb the energy (energy is added) |
| To make a substance go from a gas to a liquid to a solid what happens to the energy? | the energy is removed |
| When energy is removed what 3 things happen? | 1. the substance cools 2.molecules slow down 3. molecules move closer together |
| Name the fourth state of matter. | plasma |
| What happens to the energy in the state of plasma? | there is so much energy that all of the electrons have separated from the nuclei of the atom |
| What is the temperature like during the state of plasma? | very high temperature |
| Changing from a gas to a liquid as heat is removed and the particles lose energy and slow down...what are you called? | condensation |
| How are a substance's melting point and freezing point related? | they are at the same temperature |
| What is at the same temperature for a substance? | melting point and freezing point |
| What 2 things do most substances do when they freeze? | !. shrink and 2. take up a smaller volume |
| What substance behaves differently when it freezes? | water |
| What does water do when it freezes? | 1. expands and 2. takes up more volume |
| Water changes from ______ to _______ when it freezes. | liquid to a solid |
| What occurs when a liquid reaches a temperature at which bubbles of gas form rapidly throughout the liquid? | boiling |
| Boiling occurs when a liquid reaches a temperature at which bubble of _______ form rapidly throughout the liquid. | gas |
| What happens on the surface of a liquid at any temperature below the boiling point? | evaporation |
| True or false Molecules at the surface of a liquid have enough energy to escape? | true (they escape through evaporation) |
| When you increase pressure on a gas what happens to the volume? | it decreases the volume |
| How can you decrease the volume of a gas? | increase the pressure |
| Why does increasing pressure on a gas decrease the volume? | The space between the molecules decrease and the air inside the balloon has a smaller volume. |
| What happens to gas when it is cooled? | it contracts |
| What happens to gas when it is heated? | it expands |
| For gas, as temperature decreases, the volume____________________. | decreases |
| For gas, as the temperature increases, the volume _______________. | increases |
| When you change the size, shape, or state of matter of a substance without forming a new substance this is called what? | physical change |
| What is the process that occurs when the molecules of a solid move apart and are separated by the molecules of a liquid? | dissolving |
| What speeds up the process of dissolving? | heat |
| In dissolving, heat causes different molecules to move around faster so they can ______more rapidly. | mix |
Created by:
douglastmo
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