Maheswari

A chemical reaction is when one or more substances change into completely new substances.

Example:

When you burn wood:

• Wood + oxygen → ash + gases

• The new substances have different properties from the wood.

Key points:

• Reactants = substances you start with.

• Products = new substances made.

• Chemical reactions usually involve breaking and forming chemical bonds.

• They can cause changes like color, temperature, bubbles/gas, light, or a new smell.