1. Chapter 2–3 Warm Up Changes of Matter
1. What is 2 physical and 2 chemical properties?
2. Describe density.
3. What is the unit that density is measured in?
4. What does an object need in order to burn?

2. Chapter 2-3 Matter
Changes of Matter

3. Physical Changes
Physical Change – change of matter from one form to another without a change in chemical properties
Breaking a stick

5. Physical Changes
Dissolving in water
Melting
Sanding
Crushing

6. Physical Change Physical changes do not change a substance's identity
Quartz to sand
Gold nugget to gold ring

7. Dissolving
Dissolving is a physical change

8. Using Physical Properties to Separate
Size - one physical property often used to separate substances.
Magnetic attraction - can be used to separate substances in a mixture.

9. Distillation Process for separating substances in a mixture
Evaporating a liquid and recondensing its vapor is distillation.

10. Centrifuge
Separates part of blood

11. Chemical Changes
Chemical Change – occurs when a substance changes composition by forming a new substance

12. Chemical Changes
Respiration
Digestion

13. Chemical Changes
Form new substances with new properties
Baking a cake

14. Chemical Changes Chemical changes can be detected Color change Odor
Fizzing
Sound
Heat
Light

15. Chemical Change
Chemical changes cannot be reversed by physical changes
Unbake a cake?

16. Chemical Changes Compounds can be broken down through chemical changes
Carbonic acid give pop the fizz
Breaks down into carbon dioxide and water