Science 2 Review Sheet by nuhman10


									Grade 7 Science
Review Sheet: Cluster 2
Particle Theory of Matter

I. You should understand the following terms:

1. matter                   2. solids                       3. liquids
4. gases                    5. properties                   6. mixture
7. heterogeneous            8. homogeneous                  9. mechanical mixture
10. solution                11. pure substance              12. particle
13. theory                  14. particle theory of matter   15. solute
16. solvent                 17. dissolve                    18. soluble
19. insoluble               20. distillation                21. sieving
22. filtration              23. magnetism                   24. settling
25. saturated solutions     26. unsaturated solution        27. concentrated
28. solubility              29. dilute                      30. agitated
31. temperature             32. heat energy                 33. mechanical energy
34. chemical energy         35. thermometer                 36. degrees
37. Fahrenheit              38. Celsius                     39. thermal pollution
40. melting                 41. evaporation                 42. freezing
43. condensation            44. sublimation                 45. radiation
46. conduction              47. heat insulators             48. convection

II. You should be able to answer the following questions:

   1. What is matter?
   2. What are the three states of matter?
   3. The characteristics that are used to describe matter are called what?
   4. True or False: Every material has its own set of properties.
   5. Name three properties of water.
   6. Do different materials ever share some of the same properties?
   7. What is formed when two or more substances are combined?
   8. True or False: All materials can be described by a single set of properties.
   9. True or False: In a mixture, each kind of matter keeps its own properties.
   10. Mixtures that are made up of parts that keep their own properties are said to be
   11. Materials that have only one set of properties are called what?
   12. Give an example of a heterogeneous mixture.
   13. Give an example of a homogenous mixture.
   14. A substance made of more than one kind of material, in which the different
       materials can easily be identified is called what?
   15. Why is soda water considered to be a mechanical mixture?
   16. What is a solution?
   17. True or False: All solutions are liquids.
   18. A material that is composed of only one type of particle is called what?
19. Give an example of a pure substance.
20. True or False: Pure substances can be solids, liquids or gases.
21. When is a theory generally accepted by scientists?
22. The theory that scientists use to explain the properties of various mixtures and
    substances is called what?
23. According to the particle theory of matter, all matter is made up of what?
24. According to the particle theory of matter, each pure substance has its own kind
    of what?
25. True or False: Two different pure substances could contain particles that were
    exactly the same.
26. What will eventually happen if drink powder is added to a jug of water and
27. In a drink powder and water solution, which is the solute and which is the
28. Any substance into which a solute may be dissolved is called what?
29. When a solute is completely mixed with a solvent, what is formed?
30. True or False: Particles have an attraction to each other.
31. True or False: Any solute, if stirred enough, can be dissolved in a solvent.
32. True or False: If two materials are combined in a mixture, they can never be
    separated again.
33. List several methods of separating different components in a mixture.
34. True or False: There is no limit as to how concentrated a solution can become.
35. The limit to how concentrated a solution can become is called what?
36. What do you do to a solution when you weaken its strength by increasing the
    amount of the solvent?
37. If you dilute a solution, it will make it more concentrated.
38. Name three factors that will affect the rate at which dissolving takes place.
39. Name three things you could do to help a sugar cube dissolve quicker in a cup of
40. The relative measure of how hot or cold something is, measured on a scale is
    called what?
41. What other forms of energy can be transformed into heat energy?
42. True or False: The sense of touch is always a reliable indicator of temperature.
43. Name something that is a more reliable indicator of temperature than the sense of
44. A device used to measure temperature is called what?
45. True or False: Thermometers have scales.
46. What unit of measure is used on thermometers?
47. What are the two most common scales used to measure temperature?
48. What are the freezing point and the boiling point of water on a Fahrenheit scale?
    on a Celsius scale?
49. Why would an alcohol thermometer be better than a water thermometer to
    measure outdoor winter temperatures in Manitoba?
50. True or False: Heat causes particles to move faster.
51. What name is given to the accidental warming of the environment?
52. Name some properties of all solids.
   53. Name some properties of all liquids.
   54. Name some properties of all gases.
   55. What happens to the particles in materials when they are heated or cooled?
   56. The process by which a solid changes to a liquid is called what?
   57. The process by which a liquid changes to a gas is called what?
   58. The process by which a gas changes to a liquid is called what?
   59. The process by which a liquid changes to a solid is called what?
   60. The process by which a solid changes to a gas or a gas changes to a solid without
       becoming a liquid is called what?
   61. Name three ways in which heat can be transferred from one object to another?
   62. The transfer of energy in a special form of wave that can travel though many
       materials or empty space is called what?
   63. True or False: Heat from the sun reaches us through conduction.
   64. The process of transferring heat through direct collisions between particles is
       called what?
   65. Why is metal a better conductor of heat than wood?
   66. Give four examples of good heat insulators.
   67. The method of transferring heat through the movement of fluids is called what?
   68. Why does warm air rise?


   1.  Matter is any material that occupies space and has mass.
   2.  Solids, liquids and gases
   3.  properties
   4.  True
   5.  Answer may include: clear, colorless, odorless liquid; freezes at 0°C and boils at
   6. Yes; for example, there are other clear, odorless liquids besides water.
   7. a mixture
   8. False; for example, a multi-colored rock.
   9. True
   10. heterogeneous
   11. homogenous
   12. Answers could include: salad dressing, soda water, orange juice, milk, strawberry
   13. Answers could include: antifreeze, Kool Aid, air
   14. mechanical mixture
   15. The different materials in it can easily be identified; the water and the bubbles.
   16. A solution is a homogenous mixture of two or more substances; the distinct
       properties of the different substances that make up the solution are combined into
       one set of properties.
   17. False: solutions can be solids (sterling silver: silver and copper), liquids (ocean
       water: water and salt) or gases (air: oxygen, nitrogen and other gases).
   18. a pure substance
19. gold, oxygen, water
20. True: gold, oxygen, water
21. when it has been repeatedly tested and shown to be consistent
22. the particle theory of matter
23. extremely small particles
24. particle, different from the particles of other pure substances.
25. False
26. It will dissolve.
27. The drink powder is the solute and the water is the solvent.
28. a solvent
29. a solution
30. True
31. False. Some substances are insoluble; for example, fat in milk.
32. False
33. distillation, evaporation, sieving, filtration, magnetism, settling
34. False. Eventually, if enough solute is added, the solution will eventually become
35. solubility
36. dilute it
37. False
38. temperature, agitation, surface area exposed to the solvent
39. break the sugar cube up, stir the coffee, or heat up the coffee
40. temperature
41. mechanical energy, chemical energy, electricity
42. False: The sense of touch can be fooled such as when your hands are already
    very cold or very hot and they are then placed into lukewarm water.
43. a thermometer
44. a thermometer
45. True
46. degrees
47. the Fahrenheit scale and the Celsius scale
48. freezing: 32°F boiling: 212°F freezing: 0°C boiling: 100°C
49. Alcohol has a lower freezing point. The water in a water thermometer would
    freeze so you couldn’t measure very low temperatures.
50. True
51. thermal pollution
52. Solids have a definite size and shape.
53. Liquids have a definite size or volume but no fixed shape. They take the shape of
    their container.
54. Gases have no definite shape or size. They expand to fill all parts of their
    container and can be easily compressed into a smaller space.
55. As materials are heated their particles move faster and spread apart so they
    expand. When they are cooled, their particles slow down and move closer
    together so they contract.
56. melting
57. evaporation
58. condensation
59. freezing
60. sublimation
61. radiation, conduction, convection
62. radiation
63. False: through radiation
64. conduction
65. The particles are closer together; there are more collisions between the particles
    so more conduction occurs.
66. glass, wood, rubber, plastic, inner layers of clothing, Styrofoam
67. convection
68. It is lighter; the particles are farther apart.

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