MATTER AND ENERGY

2.5 - Energy

All physical and chemical changes (section 2.3) are accompanied by changes in energy. Here are a few common processes and their associated energy changes:

1. eating an orange results in a release of energy.
2. burning charcoal in a summer BBQ results in a release of energy.
3. ice melting in your thirst quenching drink uses energy.
4. boiling water in a kettle uses energy.

What is ENERGY?

Energy exists in a variety of forms. Energy associated with chemical reactions is evolved as heat. Other forms of energy are:

• light energy
• sound energy
• electrical energy
• mechanical energy
• chemical energy
  

Although there are various forms of energy, they can be interconverted from one form to another.

The chemical energy stored in the battery

is converted to electrical energy

to useful light energy emitted from a flashlight

and to less useful heat energy

 

Section 3.5
Energy ..p62

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