States of Matter Unit 5

Endothermic

energy is absorbed by the substance from the surroundings; temperature of the surroundings decreases

Exothermic

energy is released by the substance to the surroundings;

temperature of the surroundings increases

Vaporization

a substance changes from a liquid to a gas

Boiling, evaporation

______ occurs when the entire liquid becomes a gas; this occurs at a specific temperature and pressure. ______ occurs when only the surface of the liquid becomes a gas; this can occur at any temperature

vapor, gas

A ______ is formed when a liquid evaporates; a _____ is formed when

a liquid boils

Condensation

the process by which a gas becomes a liquid

Melting

the process by which a solid becomes a liquid

Freezing

the process by which a liquid becomes a solid

True

True or false: Freezing and Melting require the same amount of heat and occur at the same temperature.

Endothermic

Melting is an ______ change because heat is being added from

the surroundings and particle attractions weakening

exothermic

Freezing is an _______ change because heat is being lost to the

surroundings and particle attractions strengthening.

endothermic

Vaporization is an ________ change because heat is being added

from the surroundings and particle attractions weakening.

exothermic

Condensation is an _______ change because heat is being lost to

the surroundings and particle attractions strengthening.

kinetic energy

As the heat increases, so does the average _____________