1. Chemical and Physical Properties of Matter

2. Matter
Matter is
Different matter has different

3. Physical Properties A physical property Some physical properties are
Ex – Will your books fit into you backpack?
You are using the physical property of volume.

4. Physical Properties
Thermal conductivity –
State of Matter –
Density –

5. Physical Properties
Solubility –
Ductility –
Malleability –

6. Physical Changes A physical change
Ex. A piece of silver is pounded and molded into a heart-shaped pendent. (it is still silver)
Ex. – changing from a liquid to a solid (or any phase change)
Ex. – crushing an Aluminum can. It is still aluminum, just the shape has changed.
Ex – Sawdust – it is still wood – only in smaller pieces.

7. Chemical Properties Chemical properties Chemical changes occur when
Ex. – burning wood, tarnishing, and rusting

8. Chemical Properties Flammability – Reactivity –
Chemical reactions involve two main kinds of changes that you can observe –

9. Physical Properties vs. Chemical Properties
___________________– physical property being changed is shape
___________________– chemical property being changed is composition (iron is reacting with oxygen to make iron oxide - rust)
___________________– physical change of state
___________________– chemical change – it is not alcohol any more.

10. How do I know that a chemical change is taking place?
There will be a change in odor and/or color, heat will be either absorbed or released, the substance will bubble or fizz, light or sound may be given off.
Ex.

11. Changes in Energy
As matter changes, _____________________. A change in energy occurs during a chemical reaction.
An endothermic reaction
Many endothermic reactions occur when heat is constantly added. (Ex: egg frying) In other words…they need energy to keep going.

12. Changes in Energy An exothermic reaction
After an exothermic reaction, the products have ______________________________. (Ex: the burning of fuel)
The reaction between fuel and oxygen in an airplane engine releases energy, mostly in the form of heat. The expansion and movement of the gases out of the plane exerts a force that moves the plane forward.

13. Can physical and chemical changes be reversed?
Physical changes are _________________. You can melt ice and then freeze it again.
Chemical changed are___________________. When a firework explodes it would be almost impossible to put the materials back together.