H Chem Enthalpy

Front

What is enthalpy?

Back

Enthalpy is a measure of the chemical energy in a substance.

Front

What is an exothermic reaction?

Back

A reaction or process that releases heat energy is described as exothermic.

Front

Why might exothermic reactions require heat to be removed in industry?

Back

To prevent the temperature from rising.

Front

What is an endothermic reaction?

Back

A reaction or process that takes in heat energy is described as endothermic.

Front

What is a potential cost associated with endothermic reactions in industry?

Back

Endothermic reactions may incur costs in supplying heat energy to maintain the reaction rate.

Front

How can the enthalpy change associated with a reaction be calculated?

Back

The enthalpy change can be calculated from the quantity of heat energy released.

Front

What formula is used to calculate the quantity of heat energy released?

Back

Eh=cmΔT

Front

What is the enthalpy of combustion?

Back

The enthalpy of combustion is the enthalpy change when one mole of a substance burns completely in oxygen.

Front

What does Hess’s law state?

Back

Hess’s law states that the enthalpy change for a chemical reaction is independent of the route taken.

Front

What is molar bond enthalpy?

Back

Molar bond enthalpy is the energy required to break one mole of bonds in a diatomic molecule.