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What makes things dissolve faster? Read the results

5th grade (Year 6 in England) · 16 questions · Common Core: NGSS.5-PS1-4, NGSS.SEP 4 · England: KS2 Y5 Properties and changes of materials, KS2 Y5–Y6 Working scientifically

Name

Date

Score/ 16

  1. Question 1

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012014012310 °C6930 °C4950 °C1770 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  2. Question 2

    How does stirring help sugar dissolve faster?

    • A. It turns the sugar into salt.
    • B. It makes the sugar bigger.
    • C. It cools the water.
    • D. It moves fresh water next to the sugar.

  3. Question 3

    True or false? Dissolving makes the total mass smaller.

    • A. True
    • B. False

  4. Question 4

    A sugar cube was dropped into water at four temperatures. What pattern do the results show?

    Seconds for a sugar cube to dissolve02040608010012010710 °C9030 °C4650 °C1870 °C
    • A. The hotter the water, the faster the sugar dissolves.
    • B. Sugar only dissolves at 70 °C.
    • C. The colder the water, the faster the sugar dissolves.
    • D. Temperature makes no difference.

  5. Question 5

    Can you keep dissolving more and more sugar in one cup of water for ever?

    • A. No, eventually no more will dissolve and it settles at the bottom.
    • B. Yes, but only cold water.
    • C. Yes, water never fills up.
    • D. No, sugar never dissolves.

  6. Question 6

    True or false? Sand dissolves if you stir it long enough.

    • A. True
    • B. False

  7. Question 7

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012010510 °C7430 °C3650 °C1570 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  8. Question 8

    To test if temperature affects dissolving fairly, what must you keep the same?

    • A. only the cup colour
    • B. the amount of water, the type and amount of sugar, and the stirring
    • C. nothing
    • D. the temperature

  9. Question 9

    True or false? Sugar dissolves faster in hot water than in cold water.

    • A. True
    • B. False

  10. Question 10

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012014013210 °C6630 °C4650 °C2170 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  11. Question 11

    Can you keep dissolving more and more sugar in one cup of water for ever?

    • A. Yes, but only cold water.
    • B. No, sugar never dissolves.
    • C. No, eventually no more will dissolve and it settles at the bottom.
    • D. Yes, water never fills up.

  12. Question 12

    True or false? Dissolving makes the total mass smaller.

    • A. True
    • B. False

  13. Question 13

    How many seconds faster did the sugar dissolve at 70 °C than at 10 °C?

    Seconds for a sugar cube to dissolve02040608010012014013810 °C6230 °C3850 °C1570 °C

    Answers

  14. Question 14

    Can you keep dissolving more and more sugar in one cup of water for ever?

    • A. No, sugar never dissolves.
    • B. Yes, water never fills up.
    • C. No, eventually no more will dissolve and it settles at the bottom.
    • D. Yes, but only cold water.

  15. Question 15

    True or false? Dissolving makes the total mass smaller.

    • A. True
    • B. False

  16. Question 16

    A sugar cube was dropped into water at four temperatures. What pattern do the results show?

    Seconds for a sugar cube to dissolve02040608010012014013810 °C8530 °C4950 °C2470 °C
    • A. Temperature makes no difference.
    • B. The hotter the water, the faster the sugar dissolves.
    • C. Sugar only dissolves at 70 °C.
    • D. The colder the water, the faster the sugar dissolves.

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  1. 10 °C
  2. It moves fresh water next to the sugar.
  3. False
  4. The hotter the water, the faster the sugar dissolves.
  5. No, eventually no more will dissolve and it settles at the bottom.
  6. False
  7. 10 °C
  8. the amount of water, the type and amount of sugar, and the stirring
  9. True
  10. 10 °C
  11. No, eventually no more will dissolve and it settles at the bottom.
  12. False
  13. 123 s
  14. No, eventually no more will dissolve and it settles at the bottom.
  15. False
  16. The hotter the water, the faster the sugar dissolves.