14.3 Thermochemical Equations

A chemical reaction that occurs when a substance reacts with oxygen releasing energy in the form of heat and light. What am I?

Combustion reaction

Is a balanced chemical equation that includes the physical states of all reactants and products and the energy change. What am I?

Thermochemical equation

Is the enthalpy change for the complete burning of one mole of the substance.

The enthalpy (heat) of combustion

The energy change is usually expressed as………?

Change in enthalpy ΔH

Transforming a solid to liquid is called……………….?

Fusion/melting

Transforming a liquid to a gas is called?

Evaporation

Transforming a gas to a Liquid is called……….?

Condensation

Transforming a Liquid to a solid is called……………?

Freezing

Examples of endothermic reactions:

Fusion, evaporation, baking, photosynthesis

Examples of exothermic reactions:

Freezing, condensation, combustion, cellular respiration

In ΔH° what does the zero superscript mean?

Changes were determined under standard conditions

is the heat required to vaporize one mole of a

liquid

Molar enthalpy (heat) of vaporization (ΔHvap)

is the

heat required to melt one mole of a solid.

Molar enthalpy (heat) of fusion (ΔHfus)

Combustion is the reaction of a ……….. with oxygen

Fuel

………is the fuel in combustion reactions in biological systems

Food