Energy (1)

Exothermic and Endothermic Reactions

Chemical reactions either give out or take in energy. So chemical reactions cause a temperature change.

• Exothermic reactions release energy to the surroundings and cause a temperature rise.
• Endothermic reactions absorb energy from the surroundings and cause a temperature drop.

The energy given out by an exothermic chemical reactions can be used to: 

• heat things
• produce electricity
• make sound
• make light

Energy is measured in joules (J) or kilojoules (kJ).

Temperature is measured in degrees Celsius.

Comparing Fuels:

A calorimeter can be used to compare…