1.  SNC1D Findlay

2.  Cut a hold in a standard sized piece of paper that is large enough for you to fit your body through.

3. Chemical ChangesPhysical Changes food colouring and water tearing up paper magnesium + hydrochloric acid manganese dioxide + hydrogen peroxide sugar dissolved in water water boiling copper sulfate + sodium hydroxide crushing a solid copper sulfate + iron sodium + water potassium thiocyanate + iron (III) nitrate ice melting

4.  During a physical change, some properties of a material change, but the composition of the material does not change.  As gallium melts in a person’s hand, the shape of the sample changes, but the composition of the material does not change.

5.  Physical changes can be classified as reversible or irreversible. o All physical changes that involve a change from one state to another are reversible. o Cutting hair, filing nails, and cracking an egg are examples of irreversible physical changes.

6.  Five Clues of a Chemical Change 1. Heat or light is produced (or absorbed). 2. A new solid is formed  called a precipitate. 3. A gas is released.  Bubbles, fizzing or a new smell. 4. A change in colour. 5. It is hard to reverse. Keep in mind…these are just clues, not hard and fast rules!