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Year 7

Mixtures and solutions

I can use key terms to describe a solution and describe how making a solution affects its total mass.

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New
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Year 7

Mixtures and solutions

I can use key terms to describe a solution and describe how making a solution affects its total mass.

Download all resources
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Share activities with pupils
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Lesson details

Key learning points

  1. A solution is formed when a soluble solid dissolves in an appropriate solvent
  2. Mass is measured in grams
  3. The mass of substances that are mixed adds together to give the total mass of the mixture (mass is conserved)

Keywords

  • Solute - A solute is a substance that has dissolved into a solvent.

  • Solvent - A solvent is a substance into which a solute dissolves.

  • Soluble - When a solute dissolves, it is described as soluble.

  • Solution - When a solute and solvent combine, a solution forms.

  • Conservation of mass - The combined mass of starting materials equals the combined mass of the end products.

Common misconception

Pupils confuse similarly sounding key terms; solute, solvent, solution, soluble, insoluble.

Spend time discussing ways to remember the differences, e.g. solvent has more letters = have more of it in the solution.

Demonstrations of solubility in different solvents: iodine / sugar & water / cyclohexane work well. Using a visualiser for illustrating difference in volumes is particularly useful here.
Teacher tip

Content guidance

  • Risk assessment required - equipment

Supervision

Adult supervision required

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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Starter quiz

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6 Questions

Q1.
Which picture shows an insoluble substance?
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Q2.
Mass is measured in __________.
centimetres
millilitres
Correct answer: grams
centimetres-cubed
Q3.
Sugar dissolves in water, so sugar can be described as a solid.
Correct Answer: soluble
Q4.
A is a material formed from two or more substances which can be physically separated.
Correct Answer: mixture, mixtures
Q5.
Some students have been asked to describe this diagram using key terms. Who has used their key words correctly?
An image in a quiz
That shows a pure liquid.
I'm think that might be a liquid mixture.
I'm fairly certain this shows an impure solid.
Correct answer: I reckon that's a pure solid.
Q6.
Melting is a reversible, physical change. Which of the following statements is also true about melting?
Melting is what happens when a substance disappears.
Melting occurs when solid particles become more regularly arranged.
Melting is the process of a substance disappearing in a liquid.
Correct answer: Melting occurs when solid particles become more irregularly arranged.
Q1 image 1 UYSEG Q1 image 3 UYSEG Q1 image 4 UYSEG

Exit quiz

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6 Questions

Q1.
Select the two units used to measure mass.
cm³
km
Correct answer: g
s
Correct answer: kg
Q2.
Sugar will dissolve in tea. Sugar is in tea.
An image in a quiz
Correct Answer: soluble
Q3.
If salt is dissolved in water. How would you describe the solution formed?
clear
Correct answer: colourless
cloudy
translucent
opaque
Q4.
Match the definition to the word.
Correct Answer:solute,can dissolve in a liquid

can dissolve in a liquid

Correct Answer:solvent,a liquid in which a substance can dissolve

a liquid in which a substance can dissolve

Correct Answer:solution,formed when a substance dissolves in a liquid

formed when a substance dissolves in a liquid

Correct Answer:insoluble,unable to dissolve in a particular liquid

unable to dissolve in a particular liquid

Q5.
If 52.3 g of copper sulfate, a soluble substance, is added to some water and the final mass of the solution is 97.6 g, what was the mass of water?
47.6 g
52.3 g
Correct answer: 45.3 g
97.6 g
42.3 g
Q6.
A cross is drawn on two white tiles using marker pen. The pen's ink is soluble in acetone and insoluble in water. What will you see if the left is wiped with acetone and the right is wiped with water?
An image in a quiz
A
B
Correct answer: C
D