HW4.2 Thermochemistry

Front

What happens to the temperature of a substance during a phase change?

Back

The temperature always stays the same.

Front

What type of reaction occurs when the temperature decreases after mixing two chemicals?

Back

It is an endothermic reaction.

Front

What are chemical reactions that absorb energy called?

Back

Endothermic reactions.

Front

What type of reaction releases heat into the surroundings?

Back

Exothermic reaction.

Front

What does the potential energy diagram for the reaction A + B → C + energy represent?

Back

It represents an exothermic reaction.

Front

Define thermochemistry.

Back

Thermochemistry is the study of the heat energy associated with chemical reactions and changes of state.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings.

Front

What is the significance of the heat of reaction?

Back

The heat of reaction indicates the amount of energy absorbed or released during a chemical reaction.

Front

What is the role of activation energy in a chemical reaction?

Back

Activation energy is the minimum energy required for a chemical reaction to occur.