1. Physical and Chemical Changes

2. Matter Anything that has mass and takes up space (has volume) Matter
Pure Substances
Mixtures
Element
Compound
Heterogeneous
Homogeneous

3. Matter Can be described as
Physical property – description of substance. I.e. Colour, smell, taste, density, etc.
Chemical property – describes how a substance reacts when mixed with other substances. I.e. Gas burns in heat and oxygen.

4. Physical Change A change that does not produce a new substance.
Usually reversible
Change involving:
Melting, boiling, evaporation, condensation, crystallization, dissolving
E.g. melting ice, dissolving salt

5. Chemical Change A reaction takes place creating new substance.
Usually hard or impossible to reverse.
Ex. Cooking an egg

6. There are 5 clues that a chemical change may have occurred…
1. A new colour appears.

7. There are 5 clues that a chemical change may have occurred…
2. Heat or Light is given off.

8. There are 5 clues that a chemical change may have occurred…
3. Bubbles of Gas are formed.

9. There are 5 clues that a chemical change may have occurred…
4. A new solid material (precipitate) forms

10. There are 5 clues that a chemical change may have occurred…
5. A new odour is made.