Chemical reactions

1. Oxygen
2. water

1. Fuel
2. Oxygen
3. Thermal energy

1. Fungi
2. Bacteria
3. Mould

Anotações:

• Atoms ar not created or destroyed, Their bond break and the atoms are rearranged inside the new product. New bond are formed

Anotações:

• The colour of the new substance changes

Anotações:

• A gas is produced as a new product, it may smell.

Anotações:

• 2 liquids react to form a solid

Anotações:

• Energy in the form of light is produced

Anotações:

• Heat is released

Anotações:

• Heat is absorbed