Types of Changes

Front

Melting ice

Back

Physical Change: Ice turns into water, but its chemical composition (H₂O) remains the same.

Front

Tearing paper

Back

Physical Change: The paper changes shape and size, but no new substance is formed.

Front

Dissolving sugar in water

Back

Physical Change: Sugar dissolves, but it remains sugar in the solution.

Front

Boiling water

Back

Physical Change: Water turns into steam, but it is still H₂O.

Front

Rusting of iron

Back

Chemical Change: Iron reacts with oxygen to form rust (iron oxide), a new substance.

Front

Burning wood

Back

Chemical Change: Wood reacts with oxygen to produce ash, carbon dioxide, and water vapor, resulting in new substances.

Front

Baking a cake

Back

Chemical Change: Ingredients react chemically during baking, forming a new product (the cake).

Front

Souring of milk

Back

Chemical Change: Bacteria cause chemical changes in milk, producing lactic acid and curdling the milk.