# callahan-pnhs-Solids, Liquids, and Gas

Question Answer
Name the properties of a solid. Materials have a definite shape and a definite volume.
Name the properties of a liquid. A material has a definite volume but not a definite shape.
Name the properties of a gas. A material has neither a definite shape nor a definite volume.
What is kinetic energy and what does it mean in Greek? It is the energy an object has due to its motion and it means "to move" in Greek.
What is the result of a force distributed over an area? It is pressure.
At what temperature is absolute zero? A temperature of 0 K.
What does Charles's law state? That the volume of a gas is directly proportional to its temperature in kelvins if the pressure and the number of particles of a gas are constant.
What does Boyle's Law state? That the volume of a gas is inversely proportional to its pressure if the temperature and the number of particles are constant.
What is a reversible physical change that occurs when a substance changes from one state of matter to another? A phase change.
What happens during an endothermic change? The system absorbs energy from its surroundings.
What is the heat of fusion? The energy a substance must absorb in order to change from a solid to a liquid.
What happens during an exothermic change? Give an example. The system releases energy to its surroundings. Ex: Freezing.
What is vaporization? The phase change in which a substance changes from a liquid into a gas.
What is heat of vaporization? It is the energy a substance must absorb in order to change from a liquid to a gas.
Explain the process of evaporation. Evaporation is the process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point.
What is the pressure caused by the collisions of particles in a vapor with the walls of a container? Vapor pressure.
What is condensation? Give an example. It is the phase change in which a substance changes from a gas or vapor to a liquid. Ex: Morning dew on blades of grass.
What is the phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first? Sublimation.
What is the phase change of deposition? When a gas or vapor changes directly into a solid without first changing to a liquid.