1. Matter and Change
Chapter 2

2. Matter Substances Mixtures Element Compound Homogeneous Heterogeneous
Can be physically separated
Substances
Mixtures
Can be separated chemically
Element
Compound
Homogeneous
Heterogeneous

3. Properties of Matter Matter: Anything that has mass and takes up space
Two ways to describe matter:
Extensive: a property that depends on the amount of matter in a sample. (mass, volume)
Intensive: property that depends on the type of matter in a sample, not the amount of matter. (hardness, melting point, color, boiling point)

4. States of Matter Solid: definite shape and volume
Liquid: indefinite shape, flows, fixed volume
Gas: indefinite shape and volume, compresses easily
Vapor: gaseous state of a substance that’s liquid at room temp.

5. Identifying Substances
Substance (or pure substance): matter that has a uniform and definite composition and can’t be separated without changing chemical composition.
Every sample of a substance has identical intensive properties
Substances can be either an element or a compound
Element Compound
Simplest form of matter that has a unique set of properties
Substance that contains two or more elements chemically combined in a fixed proportion
-can be broken down chemically

6. Mixtures Mixture: physical blend of two or more components
Heterogeneous: composition is not uniform
Homogeneous (aka solution): composition is uniform throughout

7. Hetergeneous or Homogeneous?
Milk
Chicken Noodle Soup
Muddy Water
Air
Hot Chocolate
Red Bull
Apple
Bronze

8. Complete the “Whatsa Matter” Worksheet with a partner!
Partner Review!

9. Physical Property: quality or condition of a substance that can be observed or measured without changing the substance’s composition.(color, melting point, boiling point)
Physical change: some properties of a material change, but the composition of the material does not change.
Can be reversible or irreversible
Words: boil, freeze, melt, condense, break, split, grind, crush, cut
mentos/676123
Physical Changes

10. Chemical Property: the ability of a specific substance to undergo a specific chemical change. (Ability to rust)
Chemical Change (aka chemical reaction): A change that produces matter with a different composition than the original matter.
The composition of matter always changes
Words: burn, rot, rust, decompose, ferment, explode, corrode
Chemical Change

11. Recognizing chemical changes
Clues (although they can be tricky)
Transfer of energy
Change in color
Production of gas
Formation of a precipitate (solid that forms and settles out of a liquid)
How can you know for sure it’s a physical or chemical change? Test the sample’s composition
Recognizing chemical changes

12. Law of Conservation of Mass: in any physical or chemical change, mass is conserved.
The mass of the products is always equal to the mass of the reactants.
Conservation of Mass

13. Is it a chemical or physical change?
Sugar dissolving in tea
Chemical Change
Physical Change

14. Is it a chemical or physical change?
Logs burning
Chemical Change
Physical Change

15. Is it a chemical or physical change?
Breaking water up by separating it into hydrogen and oxygen
Chemical Change
Physical Change

16. Is it a chemical or physical change?
Metal rusting
Chemical Change
Physical Change

17. Matter SWAT THAT! Physical Change Homogenous Pure Substance
Chemical Change
Matter
Heterogeneous