Question | Answer |
what is a solid? | a solid is the state of matter in which materials have a definite shape and a definite volume. |
what is a liquid? | a liquid is the state of matter in which a material has a definite volume but a variable shape. |
what is a gas? | a gas is the sate of matter in which a material has a variable shape and variable volume. |
what is kinetic energy? | kinetic energy is the energy an object has due to motion. |
what is a phase change? | a phase change is the reversible physical change that occurs when a substance changes from one state of matter to another. |
what happens during an endothermic change? | during an endothermic change, the system absorbs energy from it's surroundings. |
what is heat of fusion? | heat of fusion is the amount of energy. the fusion is another term for melting. the heat of fusion varies from substance to substance. |
what happens during an exothermic change? | during an exothermic change, the system releases energy to its surroundings. |
what is vaporization? | vaporization is the phase change in which a substance changes from a liquid into a gas. (endothermic change) |
what is heat of vaporization? | heat of vaporization is the amount of energy on the water. it varies from substance to substance. |
what is evaporation? | the process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point. |
what is vapor pressure? | vapor pressure is pressure caused by the collisions of this vapor and the walls of the container. |
what is condensation? | condensation is the phase change in which a substance changes from a gas or vapor to a liquid. |
what is sublimation? | sublimation is the phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first. |
what is deposition? | deposition is when a gas or vapor changes directly into a solid without changing into a liquid. |