1. Matter and Related Terms
Chapter 2

2. MATTER yes no MIXTURE PURE SUBSTANCE yes no yes no Homogeneous Mixture
Can it be physically separated?
MIXTURE
PURE SUBSTANCE
yes
Is the composition uniform? no
yes
Can it be chemically decomposed? no
Homogeneous Mixture
(solution)
Heterogeneous Mixture
Compound
Element
Colloids
Suspensions

3. Pure Substances Elements composed of identical atoms
EX: copper wire, aluminum foil

4. Pure Substances Compounds
composed of 2 or more elements in a fixed ratio
properties differ from those of individual elements
EX: table salt (NaCl)

5. Mixtures Variable combination of 2 or more pure substances.
Heterogeneous
Homogeneous

6. Mixtures Solution homogeneous very small particles no Tyndall effect
particles don’t settle
EX: rubbing alcohol

7. Mixtures Colloid heterogeneous medium-sized particles Tyndall effect
particles don’t settle
EX: milk

8. Mixtures Suspension heterogeneous large particles Tyndall effect
particles settle
EX: fresh-squeezed lemonade

9. Mixtures Examples: colloid mayonnaise suspension muddy water
solution (homogeneous)
Examples:
mayonnaise
muddy water
saltwater
Italian salad dressing

10. Physical and Chemical Changes
How to tell the difference

11. Physical Change
Substance may seem different, but the way the atoms link up is the same.

12. It’s a physical change if
It changes shape or size
It dissolves.

13. It changes phase (freezes, boils, evaporates, condenses)
It’s a physical change if...
It changes phase (freezes, boils, evaporates, condenses)

14. Chemical Change
Changes the way the molecules link up
Makes new substances

15. It’s a chemical change if….
It burns
Temperature changes without heating/cooling

16. It’s a chemical change if...
It bubbles (makes a gas)

17. It’s a chemical change if...
It changes color
It forms a precipitate

18. What kind of change is it if someone...
Tears up paper?
Physical change
Mixes salt and water?

19. What kind of change is it if someone...
Burns paper?
Chemical change
Evaporates salt water?
Physical change

20. What kind of change is it if someone...
Mixes vinegar and baking soda?
Chemical change