Potential energy, from reactants to products, does this in an exothermic reaction.

Potential energy, from reactants to products, does this in an endothermic reaction.

Heat content of a substance at constant pressure.

Energy required to turn 1 mole liquid into gas at the boiling point.

Energy required to melt 1 mole solid at the melting point.

Highest potential energy state in a chemical reaction, referred to as transition state.

Heat is __ in an endothermic reaction, and heat of reaction is a __.

Energy is __ in an exothermic reaction, and heat of reaction appears as a __.

A reaction where change in enthalpy is positive.

A reaction where change in enthalpy is negative.

Type of equation that includes heat of reaction.

Tells you how 1 gram of a substance heats up when 1 calorie of energy is added.

A device used to measure energy changes in a chemical or physical change.

Type of energy found stored in chemical bonds.

Type of energy that is directly proportional to the Kelvin temperature.

When two substances reach thermal equilibrium, they have the same

What we call the potential energy increase supplied from reactant particles colliding to reach transition state.

All reactions require activation energy to get started.

Two reactant particles colliding means a reaction will take place.

Two reactant particles colliding in the proper orientation with enough activation energy means a reaction will take place.

What is characteristic of all phase changes?

For any substance, the specific heat of the solid, liquid, and gas phases are the same.

The specific heat of water is

What phase changes are possible when a substance cools? (select all that apply)