Energy and Chemical Change
Science

A unit of heat used to measure the energy content of food, a calorie is the amount of heat required to raise the temperature of 1 g of water by 1°C
Calorie
A unit of heat used to measure the energy content of food, a calorie is the amount of heat required to raise the temperature of 1 g of water by 1C. A calorie is a measure of energy in food.

The total heat content of a system, the internal energy of the system plus the product of pressure and volume
Enthalpy
The total heat content of a system, the internal energy of the system plus the product of pressure and volume. Enthalpy. Enthalpy is the measure of energy in a system, including internal energy and the energy needed to make room for it by displacing its environment.

The amount of heat energy needed to increase the temperature of an object exactly 1°C
Heat capacity
The amount of heat energy needed to increase the temperature of an object exactly 1C. Heat capacity. Heat capacity is the measure of how much heat energy an object can absorb before its temperature rises by 1C.

The amount of heat released or absorbed in a reaction does not depend on the number of steps in the reaction
Hess law
The amount of heat released or absorbed in a reaction does not depend on the number of steps in the reaction. Hess's law. Hess's law states that the total energy change in a chemical reaction is the same, no matter how many steps the reaction takes.

A balanced equation that includes the reactants and products, and specifies the change in enthalpy
Thermochemical equation
A balanced equation that includes the reactants and products, and specifies the change in enthalpy thermochemical equation. A thermochemical equation shows the energy change in a chemical reaction.