1. Chapter 2: Matter
Sections 2.2 & 2.3

2. 2.2 Properties of Matter Objectives
To learn to distinguish between physical and chemical properties
To learn to distinguish between physical and chemical changes

3. Physical Property
Characteristic of a substance that can change without changing the substance’s composition.

4. Physical Change
A change that does not affect the composition of a substance

5. Examples of Physical Changes
Melting/ Freezing
Vaporizing/ Condensing
Cutting
Grinding
Squishing

6. Chemical Property
Characteristic that describes the ability of a substance to change into a different substance.

7. Chemical Change
Change in which a substance becomes a different substance.

8. Examples Flammability (burning) Exploding Fermenting Digesting
Corroding
Tarnishing
Rusting

9. Evidence of a chemical change

10. Evidence of a chemical change
Formation of bubbles
Formation of a precipitate (a solid)
A color or odor change
Heat, Cold and/ or light evolves

11. 2.3 Classifying Matter Objectives
To learn to distinguish between mixtures and pure substances.
To learn two methods of separating mixtures.

12. Mixtures and Pure Substances
Defined as something w/ a variable composition.
Examples:
Soda – water, sugar, carbon dioxide
Sea water – water, minerals, salt, etc.
14 carat gold – 36% gold, 25% silver, 37% copper
Dirt
Air – nitrogen, oxygen, argon, helium, neon, carbon dioxide, water vapor, etc.

13. 2 Types of Mixtures
Homogeneous Mixture: mixture that is the same throughout. Can also be called… solutions!
Heterogeneous Mixture: mixture containing regions of varying composition.

14. Heterogeneous or Homogeneous Mixture?

15. Separation of Mixtures
Mixtures can be separated utilizing each substances physical properties.
There are several ways to separate mixtures…
Use a magnet
FILTRATION
DISTILLATION
Picking it out

16. Distillation
A separation process that depends on the different boiling points of the substances.

17. Filtration
Separation of a solid from a liquid by using filter paper.

18. Mixtures and Pure Substances
Always has the same composition, no matter what!
Can be
Elements
See Periodic Table
Compounds
There are millions!!!!!!
H2O, NaOH, Al2(SO4)3, NaCl, C6H12O6