Thermochemistry Vocabulary

4. Energy that transfers from one object to another because of a temperature difference between the objects
5. The temperature at which the vapor pressure of a liquid is just equal to the external pressure on the liquid
6. A form of matter that takes the shape and volume of its container; a gas has no definite shape or volume
8. A process that releases heat to its surroundings
11. The change of a solid into a liquid when heat is applied
12. The process through which matter transitions from its initial gaseous state into its final liquid state
13. The process in which a solid changes to a gas or vapor without passing through the liquid state
16. The zero point on the Kelvin temperature scale, equivalent to -273.15 degrees C
19. When the internal vapor pressure of a liquid equals the external pressure
20. Vaporization that occurs at the surface of a liquid that is not boiling

1. The temperature at which a substance changes from a solid to a liquid; the melting point of water is 0 degrees C
2. The temperature of a liquid at which it changes its state from liquid to solid at atmospheric pressure
3. The temperature scale on which the freezing point of water is 0 degrees C and the boiling point is 100 degrees C
7. A measure of the average kinetic energy of particles in matter; temperature determines the direction of heat transfer
9. A process that absorbs heat from the surroundings
10. The SI unit of energy; 4.184 J equal one calorie
14. Describes the gaseous state of a substance that is generally a liquid or solid at room temperature
15. The temperature scale in which the freezing point of water is 273 K and the boiling point is 373 K; 0 K is absolute zero
17. A form of matter that has a definite shape and volume
18. A form of matter that flows, has a fixed volume, and an indefinite shape