(Q2) Endothermic and Exothermic Reactions

Front

What is an exothermic reaction?

Back

A chemical reaction that releases energy in the form of heat or light when the products form.

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs energy from its surroundings, requiring more energy to break the bonds of the reactants than is released when the products form.

Front

What happens to energy in an exothermic reaction?

Back

More energy is released when the products form than is required to break the bonds of the reactants.

Front

What happens to energy in an endothermic reaction?

Back

More energy is absorbed than is released, resulting in a net gain of energy.

Front

What is an example of an exothermic reaction?

Back

Combustion of fuels, such as burning wood or gasoline.

Front

What is an example of an endothermic reaction?

Back

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

Front

What is the role of energy in chemical reactions?

Back

Energy is required to break bonds in reactants and is released when new bonds form in products.

Front

How can you identify an exothermic reaction?

Back

By observing that light and heat are released during the reaction.

Front

How can you identify an endothermic reaction?

Back

By noticing that the reaction absorbs heat, often resulting in a temperature drop.

Front

What is the law of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.