1. Can you change your matter?

2. Name one physical property of this bear.
Review
Name one physical property of this bear.

3. Chemical Properties
The ability of a substance to undergo chemical reactions and form NEW substances
Chemical Properties describe CHEMICAL CHANGES
Example: burning a tree creates new substances (ash and smoke)

4. Examples of Chemical Properties
Combustibility
Reactivity with oxygen, acid or water
Flammability

5. Give an example of a chemical property.
Review
Give an example of a chemical property.

6. Study Buddy Review!!
Classify each as a physical or chemical property of matter:
Blue Color
Ability to Rust
Density
Flammability
Reacts with a base to form water
Boiling Point
Reacts with water to form a gas
Luster
Mass
Odor

7. What could you do to this lemon to change it physically?
Physical Change is a change that affects one or more physical properties of a substance.
What could you do to this lemon to change it physically?

8. How can you physically change the paper?
Crumble it.
Rip it.
Cut it.

9. How can you physically change ice?
Cut it.
Melt it.

10. Examples of Physical Changes
Freezing water into ice cubes
Sanding a piece of wood
Cutting your hair
Crushing an aluminum can
Bending a paperclip
Ironing your clothes

11. What are chemical changes?
A chemical change occurs when a substance changes into something new. This occurs due to heating, chemical reaction, etc.
Definition of chemical change.

12. You can tell a chemical change has occurred if the density, melting point or freezing point of the original substance changes.

13. Examples of Chemical Changes…
Combustion
Electrolysis
Oxidation
Tarnishing
Reacting with oxygen, acid or water

14. Evidence for Chemical Reactions…
Color Change
Precipitation
Gas production
Temperature changes
Changes in properties

15. Characteristics of Chemical Changes
Reaction with acids
Reaction with bases (alkalis)
Reaction with oxygen (combustion)
Ability to act as oxidizing agent
Ability to act as reducing agent
Reaction with other elements
Decomposition into simpler substances
Corrosion
Chemical Changes are characterized by the following:

16. Discover Activity
Obtain a small piece of chalk. Observe it and record its properties in your notebook.
Place the chalk on a piece of paper and crush it with the back of a spoon. Record the changes that occurred in your notebook

17. Discover Activity (Cont.)
Place some of the crushed chalk into the bowl of the spoon. Add about 8 drops of vinegar. Record what happens in your notebook.

18. Explanation
Chalk is mostly a single substance, calcium carbonate. Do you think a new substance was formed when the chalk was crushed?
Do you think a new substance was formed when vinegar was added? Provide evidence for your answers.

19. Physical Changes Changes that alter the form or appearance of matter.
Does not change the substances in the matter into new substances.

20. Examples of Physical Changes…
Changes in State
When matter changes from a solid to a liquid or a liquid to a gas.
Ice/water vapor/liquid water
Dissolving
Bending, crushing, breaking, chopping

21. Check for understanding
Why is the melting of an ice cube called a physical change?
The substance is still water, just the form has changed.

22. Chemical Change
Occurs when a substance is transformed into a different substance.
The newly formed substances have different properties than the original substances.

23. Discover Activity Take a beaker and fill with 50 mL of water
Drop 3 drops of red dye into the water
Make observations.
Is it a physical or chemical change?
Which one is the Solvent? Solute?

24. Cont. Discover Activity
Now, add 5 drops of bleach to the solution of red colored water.
Make observations.
Is this a physical or chemical change? Explain.

25. Let’s See What You Have Learned About the Properties of Matter…