1. Pure Substances and Mixtures
Categorizing Matter

2. All matter in the universe is either a pure substance or a mixture.

3. Two Types of Pure Substances
Made of either a single element or one particular kind of compound
Has a definite composition
H2O, NaCl, C, etc.
Can’t be broken down into simpler substances through physical changes
Two Types of Pure Substances
Elements
Compounds

4. Consists of only one type of atom
Element =
Consists of only one type of atom
Au, Ag, C, Na, Br, K, H, etc.
Compound =
2 or more different atoms chemically combined together
Composition is always the same
Cannot be broken down using physical changes
H20, NaCl, CO2, etc.

5. Substances that have been combined physically (no chemical reaction)
Mixtures =
Substances that have been combined physically (no chemical reaction)
Homogeneous Mixtures = solutions
“Homo” = same
Mixture that looks the same everywhere
Air, salt water, sugar water
Heterogeneous Mixtures = suspensions
“Hetero” = different
Looks different throughout
Mud puddle, blood, salad dressing, chocolate chip cookie, bird seed

7. Element, Compound, or Mixture?

8. Element, Compound, or Mixture?

9. Element, Compound, or Mixture?

10. Element, Compound, or Mixture?

11. Element, Compound, or Mixture?

12. Element, Compound, or Mixture?

13. Element, Compound, or Mixture?

14. Element, Compound, or Mixture?

15. Exam Review and ET:
#9-12

16. 9. A heterogeneous mixture is one that is not a. uniform throughout. b
9. A heterogeneous mixture is one that is not a. uniform throughout. b. made of two or more liquids. c. easily mixed together. d. edible by humans.

17. 10. Which of the following is a homogeneous mixture. a
10. Which of the following is a homogeneous mixture? a. salad dressing b. rubbing alcohol c. gelatin d. orange juice with pulp

18. 11. A compound differs from a mixture because it a
11. A compound differs from a mixture because it a. always remains frozen even at high temperatures. b. is formed from two cations. c. always contains the same elements in the same proportion. d. can form only in the presence of heat energy.

19. 12. Each molecule of table sugar, C12H22O11, contains
0 atoms of carbon.
6 atoms of carbon.
c. 1 atom of carbon.
d. 12 atoms of carbon.