Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat or light to its surroundings.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What happens to temperature during an exothermic reaction?

Back

The temperature of the surroundings increases because heat is released.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature of the surroundings decreases because heat is absorbed.

Front

Give an example of an exothermic reaction.

Back

Combustion of fuels, such as burning wood or gasoline, is an example of an exothermic reaction.

Front

Give an example of an endothermic reaction.

Back

The process of photosynthesis in plants is an example of an endothermic reaction.

Front

What is the role of energy in chemical reactions?

Back

Energy is either absorbed or released during chemical reactions, determining whether the reaction is exothermic or endothermic.

Front

How does a hand warmer work?

Back

A hand warmer typically contains chemicals that undergo an exothermic reaction, releasing heat to warm the hands.

Front

What is the significance of temperature change in reactions?

Back

Temperature change indicates whether a reaction is exothermic (heat released) or endothermic (heat absorbed).

Front

What is the relationship between endothermic reactions and cold sensations?

Back

Endothermic reactions absorb heat, which can cause a cold sensation when touching the reaction mixture.