Endothermic and Exothermic Reactions

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs energy from its surroundings, resulting in a decrease in temperature.

Front

What is an exothermic reaction?

Back

A chemical reaction that releases energy to its surroundings, usually in the form of heat, resulting in an increase in temperature.

Front

What happens to energy in a reaction where energy required to break bonds equals energy released when products form?

Back

Energy remains the same.

Front

In an endothermic reaction, what happens to the energy?

Back

More energy is absorbed than is released.

Front

What is the role of energy in breaking chemical bonds?

Back

Energy is absorbed to break bonds between atoms.

Front

What is the conservation of energy principle in chemical reactions?

Back

Energy cannot be created or destroyed; it can only change forms.

Front

Give an example of an endothermic reaction.

Back

Photosynthesis, where plants absorb sunlight to convert carbon dioxide and water into glucose.

Front

Give an example of an exothermic reaction.

Back

Combustion of fuels, such as burning wood or gasoline, which releases heat.

Front

What is the effect of temperature on endothermic reactions?

Back

Endothermic reactions typically require heat, so increasing temperature can speed up the reaction.

Front

What is the effect of temperature on exothermic reactions?

Back

Exothermic reactions release heat, so increasing temperature can slow down the reaction.