1. Chemical Properties Chemical Property – something that leads to a change in composition of matter

2. Flammability – – ability to burn when oxygen is present –Can be a good and bad property (lighter fluid SHOULD be flammable, Carpet is bad to be flammable) –Solids, liquids or gases.

3. Reactivity- – the ability to combine with another substance easily –Oxygen reacts with most substances Causes rusting of metals, allows fire to burn Nitrogen is not very reactive and is often added to reduce the other element side effects

4. How to tell the difference Physical and Chemical Changes

5. Physical Change- – physical properties change, but the substance is the same –Change in what you see but does not produce a new substance Painting a house, cutting hair, ironing shirt, melting water/boiling water

6. Some physical changes are reversible, some are not Reversible—freezing & melting water, braiding hair Non-reversible—slicing a tomato, peeling an orange

7. It’s a physical change if It changes shape or size It dissolves.

8. It changes phase (freezes, boils, evaporates, condenses) It’s a physical change if...

9. Chemical Change Chemical Change- – when substances react to form one or more NEW substances –Look for permanent change in color, gas bubbles, leftover solid –Non-Reversible

10. It’s a chemical change if…. It burns Temperature changes without heating/cooling

11. It’s a chemical change if... It bubbles (makes a gas)

12. It’s a chemical change if... It changes color permanently It forms a leftover solid

13. –Examples: Silver ring that turns green Rusting cars Copper pennies turning green Baking powder in cake – cake rises Vinegar and baking soda Adding vinegar to milk Lighting a match Explosion or burning of wood

14. What kind of change is it if someone... Tears up paper? Physical change Mixes salt and water? Physical change

15. What kind of change is it if someone... Burns paper? Chemical change Evaporates salt water? Physical change

16. What kind of change is it if someone... Mixes vinegar and baking soda? Chemical change