AP Chem Unit 6 Thou Shall Not Forget

Front

According to Hess' Law, if you reverse a reaction, ΔH will ________________________

Back

Change signs

Front

Bond enthalpy is the amount of energy it takes to break __________ of a bond.

Back

one mole

Front

According to Hess' Law, if you double the coefficients of a reaction, ΔH will ________________________

Back

Double

Front

In the dissolution process, the increase in separation between ions in the solute is __________.

Back

endothermic

Front

Back

This equation helps calculate the change in enthalpy during a reaction.

Front

What is Hess' Law?

Back

Hess' Law states that the total enthalpy change for a reaction is the sum of the enthalpy changes for the individual steps, regardless of the pathway taken.

Front

Define bond enthalpy.

Back

Bond enthalpy is the energy required to break one mole of a bond in a gaseous substance.

Front

What happens to ΔH when a reaction is reversed?

Back

ΔH changes signs.

Front

What is the relationship between reaction coefficients and ΔH according to Hess' Law?

Back

If the coefficients of a reaction are doubled, ΔH will also double.

Front

What type of process is the dissolution of ionic compounds in water?

Back

It is often endothermic, as energy is required to separate the ions.