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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

    Granulated sugar dissolves faster than a sugar cube of the same mass. Why?

    • A. Smaller pieces have more surface touching the water.
    • B. Water dislikes cubes.
    • C. Cubes are heavier.
    • D. Granulated sugar is a different substance.

  2. Question 2

    True or false? Stirring speeds up dissolving.

    • A. True
    • B. False

  3. Question 3

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012014013110 °C8130 °C3850 °C2070 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  4. Question 4

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

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

  5. Question 5

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

    • A. True
    • B. False

  6. Question 6

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012011710 °C8030 °C4650 °C1670 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  7. Question 7

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

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

  8. Question 8

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

    • A. True
    • B. False

  9. Question 9

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012010110 °C7730 °C3750 °C2370 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  10. Question 10

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

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

  11. Question 11

    True or false? Stirring speeds up dissolving.

    • A. True
    • B. False

  12. Question 12

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012014012710 °C7330 °C3650 °C2170 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  13. Question 13

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

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

  14. Question 14

    True or false? Dissolving makes the total mass smaller.

    • A. True
    • B. False

  15. Question 15

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

    Seconds for a sugar cube to dissolve02040608010012014012210 °C6930 °C4350 °C1570 °C

    Answers

  16. Question 16

    How does stirring help sugar dissolve faster?

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

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Answer key: What makes things dissolve faster? Read the results

  1. 1. A. Smaller pieces have more surface touching the water.

  2. 2. A. True

  3. 3. A. 10 °C

  4. 4. B. No, eventually no more will dissolve and it settles at the bottom.

  5. 5. B. False

  6. 6. A. 10 °C

  7. 7. C. No, eventually no more will dissolve and it settles at the bottom.

  8. 8. A. True

  9. 9. A. 10 °C

  10. 10. D. No, eventually no more will dissolve and it settles at the bottom.

  11. 11. A. True

  12. 12. A. 10 °C

  13. 13. C. No, eventually no more will dissolve and it settles at the bottom.

  14. 14. B. False

  15. 15. 107 s

  16. 16. A. It moves fresh water next to the sugar.