Thermochemistry Vocab Review

Why kinetic energy increases when potential energy decreases and vice versa.

• Temperature

• Law of Conservation of Energy

• Heat

• To conserve mass

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

• release

• decrease

• increase

• absorb

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

• absorb

• decrease

• increase

• release

Heat content of a substance at constant pressure.

• heat of vaporization

• heat of fusion

• heat of reaction

• enthalpy

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

• heat of vaporization

• heat of fusion

• heat of reaction

• enthalpy

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

• heat of vaporization

• heat of fusion

• heat of reaction

• enthalpy

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

• Reactants

• Products

• Activated Complex

• Activation Energy

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

• absorbed, product

• released, product

• released, reactant

• absorbed, reactant

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

• absorbed, product

• absorbed, reactant

• released, reactant

• released, product

A reaction where change in enthalpy is positive.

• Exothermic

• Endothermic

• Slow

• Fast