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Science lesson plan · 5th grade (Year 6 in England) · 30 minutes

What makes things dissolve faster? Read the results

Materials and their properties

CCSS NGSS.5-PS1-4CCSS NGSS.SEP 4England: KS2 Y5 Properties and changes of materialsEngland: KS2 Y5–Y6 Working scientifically

Objective and success criteria

Students will: What makes things dissolve faster? Read the results.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Dissolving and solutions

Leads to: the next skill in this area.

Materials: A tray of everyday objects, Sorting hoops, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 4 min

  • Quick retrieval from earlier learning (Dissolving and solutions). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Is salt soluble or insoluble in water? (soluble (dissolves in water) / insoluble (does not dissolve)) → soluble (dissolves in water)Prompt: Imagine stirring it into a glass of water. Would it disappear from view?
  2. 30 g of salt is dissolved in 500 g of water. What is the mass of the solution, in g? → 530 gPrompt: When something dissolves, does it disappear or is it still there?
  3. In salt water, what is the solvent? (salt water / the cup / water / salt) → waterPrompt: The solvent is the liquid that does the dissolving.

Hook · 3 min

  • Pass round objects made of different materials and ask why each one was chosen.
  • Share the objective: What makes things dissolve faster? Read the results. Read the success criteria together.

I do: model it · 7 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: To test if temperature affects dissolving fairly, what must you keep the same?
  • Step 1: Change only the temperature; keep everything else the same.
  • Step 2: So the answer is: the amount of water, the type and amount of sugar, and the stirring
  • Answer: the amount of water, the type and amount of sugar, and the stirring
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 6 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. To test if temperature affects dissolving fairly, what must you keep the same? (only the cup colour / the amount of water, the type and amount of sugar, and the stirring / the temperature / nothing) → the amount of water, the type and amount of sugar, and the stirringPrompt: What is the one thing you are changing?
  2. True or false? Dissolving makes the total mass smaller. (True / False) → FalsePrompt: Temperature, stirring and particle size: what does each do?

You do: independent practice · 7 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 6 questions are on the student sheet below, with answers in the key.

Exit ticket · 3 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. True or false? Sugar dissolves faster in hot water than in cold water. (True / False) → TruePrompt: Temperature, stirring and particle size: what does each do?
  2. Granulated sugar dissolves faster than a sugar cube of the same mass. Why? (Cubes are heavier. / Granulated sugar is a different substance. / Water dislikes cubes. / Smaller pieces have more surface touching the water.) → Smaller pieces have more surface touching the water.Prompt: Where does dissolving happen?

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: Dissolving and solutions.
  • Use concrete materials: a tray of everyday objects.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-5.

Free lesson plan from eurekami.com/lesson-plan-builder

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What makes things dissolve faster? Read the results

Name

Date

Score/ 6

  1. Question 1

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

    Seconds for a sugar cube to dissolve02040608010012010810 °C6030 °C3750 °C2470 °C

    Answers

  2. Question 2

    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.

  3. Question 3

    True or false? Crushed sugar dissolves faster than a whole cube.

    • A. True
    • B. False

  4. Question 4

    At which temperature did the sugar take longest to dissolve?

    Seconds for a sugar cube to dissolve02040608010012011410 °C6430 °C4450 °C1770 °C
    • A. 10 °C
    • B. 30 °C
    • C. 50 °C
    • D. 70 °C

  5. Question 5

    True or false? Cold water dissolves sugar fastest.

    • A. True
    • B. False

  6. Question 6

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

    Seconds for a sugar cube to dissolve02040608010012014013210 °C6530 °C3650 °C2170 °C
    • A. Sugar only dissolves at 70 °C.
    • B. The hotter the water, the faster the sugar dissolves.
    • C. The colder the water, the faster the sugar dissolves.
    • D. Temperature makes no difference.

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

  1. 1. 84 s

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

  3. 3. A. True

  4. 4. A. 10 °C

  5. 5. B. False

  6. 6. B. The hotter the water, the faster the sugar dissolves.