1. Who Wants to Pass Science 9?
Chapter 2

2. A mixture that appears to contain only one substance is a(an)
A. Element
B. Compound
C . Heterogeneous mixture
D. Homogeneous mixture

3. Which of the following is a characteristic of a mixture?
A. Contains only pure substances
B. Has a fixed composition
C. Has varying properties
D. Both b and c

4. Which of the following is a mixture?
A. Sand
B. Silicon dioxide
C. Silicon
D. Carbon dioxide

5. Water is a compound because it
A. Is made of water atoms joined together
B. Always has two hydrogen atoms for each oxygen atom
C. Can be broken down into simpler substances
D. Both a and b

6. If a material contains three elements joined in a fixed proportion, it is a(an)
A. Compound
B. Atom
C. Solution
D. Mixture

7. The symbol for gold is
A. Go
B. Gl
C. Al
D. Au

8. What is the symbol for aluminum?
A. A
B. Au
C. Al
D. AL

9. If an unknown substance CANNOT be broken down into simpler substances, it is
A. Made of one kind of atom
B. An element
C. A compound
D. Both a and b

10. A substance that is made up of only one kind of atom is a(an)
A. Solution
B. Element
C. Homogeneous mixture
D. Compound

11. Which of the following is NOT a pure substance?
A. Carbon dioxide
B. Water
C. Oxygen
D. Milk

12. Which of the following are pure substances?
A. Colloids
B. Homogeneous mixtures
C. Compounds
D. Solutions

13. Filtration can be used to separate mixtures based on
A. The size of their particles
B. Their melting points
C. Their densities
D. Their boiling points

14. Which of the following materials is useful for making molds because it has a low melting point?
A. Wax
B. Clay
C. Metal
D. Wood

15. What physical properties of nylon and leather make them good materials to use for shoelaces?
A. Low viscosity and flexibility
B. Hardness and durability
C. Durability and flexibility
D. High density and low conductivity

16. A material that is malleable and conducts electricity is most likely
A. Motor oil
B. A metal
C. Ice
D. Wood

17. A substance has a melting point of 0°C and a boiling point of 100°C
A substance has a melting point of 0°C and a boiling point of 100°C. The substance is most likely
A. Table salt
B. Gold
C. Hydrogen
D. Water

18. Which of the following has the highest viscosity?
A. Orange juice
B. Water
C. Milk
D. Corn syrup

19. Which of the following is malleable?
A. Gold
B. Ice
C. Pottery
D. Glass

20. You are about to open a container of soy milk but notice that there are instructions to “shake well before serving”. The soy milk is most likely a
A. Suspension
B. Colloid
C. Pure substance
D. Solution

21. A mixture can be classified as a solution, suspension, or colloid based on the
A. Size of its smallest particles
B. Color of its particles
C. Size of its largest particles
D. Number of particles it contains

22. Which of the following is a heterogeneous mixture?
A. Stainless steel
B. A jar of mixed nuts
C. Sugar water
D. Water in a swimming pool

23. Which of the following is a clue of a chemical change?
A. A gas forms when vinegar and baking soda are mixed
B. Balls of wax form when melted wax is poured into ice water
C. Gas bubbles form in boiling water
D. Iron changes color when heated

24. During which of the following is NOT a clue that a chemical change has occurred?
A. Change in shape
B. Formation of a precipitate
C. Production of a gas
D. Change in color

25. Which of the following is a chemical change?
A. Water breaking down into hydrogen and oxygen
B. Water boiling
C. Ice being carved
D. Ice melting

26. During which of the following chemical changes does a precipitate form?
A. A banana ripens
B. Lemon juice is added to water
C. Lemon juice is added to milk
D. Vinegar is added to baking powder

27. A substance that has high reactivity
A. Has a high boiling point
B. Displaces dissolved oxygen
C. Burns in the presence of water
D. Easily combines chemically with other substances

28. Flammability is a material’s ability to burn in the presence of
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen

29. Which of the following is a physical change?
A. A copper roof changing color from red to green
B. Rust forming on an iron fence
C. Burning a piece of wood
D. Sawing a piece of wood in half

30. When a physical change in a sample occurs, which of the following does NOT change?
A. Composition
B. Volume
C. Temperature
D. Shape

31. What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?
A. Screening
B. Straining
C. Distillation
D. Filtration

32. Fill-ins
Matter that always has exactly the same composition is classified as a(an)__________________________.

33. Fill-ins
A(An) ________________________ change occurs when a material changes shape or size but the composition of the material does not change.

34. Fill-ins
_______________________ is a process that could be used to separate dissolved particles from the liquid in a solution.

35. Fill-ins
A material used for electrical wiring would need to have good _______________________.

36. Fill-ins
If a spoon gets hot quickly when it is used to stir a pot of soup, it is probably made of __________________________.

37. Fill-ins
Measuring ___________________ can be used to test the purity of some substances.

38. Fill-ins
If the particles in a mixture scatter light, the mixture is either a(an)_____________________ or a(an)________________________.

39. Fill-ins
Fresh milk is a suspension, but homogenized milk is a(an) ________________________.

40. Fill-ins
In a(an) _______________________ mixture, the parts of the mixture are noticeably different from one another.

41. Fill-ins
The substances in a (an) _______________________ mixture are evenly distributed throughout the mixture.

42. Fill-ins
A compound can be made from two or more elements or other _________________ joined together in a fixed composition.

43. Fill-ins
The symbol for elements have either ___________ or _________________ letters.

44. Fill-ins
An element has a fixed composition because it contains only one type of _____________________.

45. Fill-ins
Pure substances are either __________________ or _______________________.

46. Fill-ins
When a metal changes color because it has been heated, a(an)__________________ change occurred. When a metal changes color because it has reacted with another substance, a(an)_____________________ change occurred.

47. Fill-ins
A cake rises as it bakes because a chemical change causes _________________ to be produced.

48. Fill-ins
A solid that forms and separates from a liquid mixture is a(an) _____________________.

49. Fill-ins
Rust forms because iron and oxygen are highly ________________ elements.

50. Fill-ins
____________________ properties can be observed only when the substances in a sample of matter are changing into different substances.

51. Other
You will be presented with questions about data tables that you need to interpret.