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WorksheetYear 8Level 2 · Standard

Free Year 8 Solutions, Solubility and Dissolving Worksheet

Students learn the vocabulary of solutions (solute, solvent, soluble, insoluble, saturated, concentrated and dilute), explain dissolving with the particle model, and identify the factors that change how fast a solid dissolves. They read a solubility table, calculate how much solid stays undissolved or crystallises on cooling, work out a concentration in grams per litre and plan a fair test.

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Year
Year 8
Subject
Science
Topic
Mixtures & Chemical Reactions
Difficulty
Level 2 · Standard
Estimated time
40 minutes
Curriculum
New Zealand Curriculum
Questions
14
Answers
Included, with working
Format
PDF (A4), print or complete online

Students will practise

  • using the terms solute, solvent, solution, soluble and insoluble
  • explaining dissolving using the particle model
  • identifying factors that affect the rate of dissolving
  • interpreting solubility data
  • calculating concentration in grams per litre

Curriculum: New Zealand Curriculum. We show specific outcome codes only where they have been verified against the official curriculum document.

What's next?

Completed: Solutions, Solubility and Dissolving

Ready for more? Move on to Year 9 Science.

How to use this worksheet

  1. Print the PDF or complete it on screen. Write the student's name and date at the top.
  2. Read the instructions for each part together before starting. Encourage working to be shown.
  3. Mark with the answer sheet. Use the model answers and success criteria as a guide rather than a single right answer.
  4. Record the score, celebrate what went well, then follow the "What's next" suggestion.

Common questions

Who is this worksheet for?

Year 8 students (typically ages 12–13) working on mixtures & chemical reactions. It is pitched at level 2 · standard.

Are the answers included?

Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.

How long does it take?

About 40 minutes for 14 questions. Short, regular sessions work best: two or three a week beats one long one.

Do I need to sign up to download?

No. Click Download Free PDF and it opens immediately. It is free for personal, classroom and homeschool use.

What should we do next?

Explore more Year 8 science resources.

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Success TutoringWorksheetsYear 8 · Science · Mixtures & Chemical Reactions

Solutions, Solubility and Dissolving

Name

Date

Score /

Remember: the solute dissolves IN the solvent to make a solution.

Part A: The language of solutions

Read the passage, then answer the questions.

A solution forms when a solute dissolves in a solvent. Water is called the universal solvent because it dissolves so many substances. Substances that dissolve are soluble; those that do not are insoluble.

In the particle model, dissolving happens when the solute particles separate and spread out evenly between the solvent particles. The solute does not disappear, so the total mass stays the same.

A concentrated solution has a lot of solute in a given volume; a dilute solution has only a little. A saturated solution cannot dissolve any more solute at that temperature.

1.Match each term to its meaning.
  • solute
  • solvent
  • solution
  • insoluble
  • saturated
  • the liquid that does the dissolving
  • holds as much solute as it can at that temperature
  • the substance that dissolves
  • the mixture formed when a solute dissolves in a solvent
  • does not dissolve
2.When sugar dissolves in water, what happens to the sugar?
  1. AIt disappears and no longer exists.
  2. BIts particles spread out between the water particles.
  3. CIt turns into water.
  4. DIt becomes a gas.
3.In salt water, which substance is the solvent?
  1. Asalt
  2. Bwater
  3. Cboth
  4. Dneither
4.Sand is insoluble in water. ☐ True   ☐ False
5.When 10 g of salt dissolves in 100 g of water, the solution has a mass of 110 g. ☐ True   ☐ False

Part B: How fast does it dissolve?

Three factors affect how quickly a solid dissolves: the temperature of the solvent (hotter is usually faster), stirring (faster) and the size of the pieces (smaller pieces have a larger surface area, so they dissolve faster).

6.Which change would make a sugar cube dissolve more slowly?
  1. Astirring the water
  2. Busing hotter water
  3. Ccrushing the cube into powder
  4. Dusing colder water
7.Why does powdered sugar dissolve faster than a sugar cube?
  1. APowder is a different substance.
  2. BPowder has a larger surface area in contact with the water.
  3. CPowder is heavier.
  4. DPowder is colder.
8.Stirring speeds up dissolving because it brings fresh (answer space) into contact with the solute.

Part C: Solubility data and concentration

Show your working.

Solubility of substance X (the greatest mass that dissolves in 100 mL of water)

0 °C: 15 g · 20 °C: 30 g · 40 °C: 50 g · 60 °C: 75 g · 80 °C: 100 g

Concentration tells us how much solute is in a volume of solution: concentration (g/L) = mass of solute (g) ÷ volume of solution (L).

9.What is the greatest mass of substance X that dissolves in 100 mL of water at 40 °C? (answer space)
10.A student adds 40 g of substance X to 100 mL of water at 20 °C and stirs well. How much stays undissolved? (answer space)
11.A saturated solution of X in 100 mL of water at 60 °C is cooled to 20 °C. What mass of crystals forms? (answer space)
12.25 g of salt is dissolved to make 250 mL of solution. What is its concentration in grams per litre (g/L)? (answer space)
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About this resource

Created by
Success Tutoring Science Team
Last reviewed
1 October 2026
How it was made
Written by our team

Free to print and share for personal, classroom and homeschool use. Please don't resell. Spotted an error? Let us know.