Science · Year 5

Active learning ideas

Solutions and Solutes

Active learning helps Year 5 students grasp solutions and solutes because hands-on experiments let them see dissolving in real time, moving beyond abstract ideas to observable evidence. By testing materials themselves, students connect textbook definitions to lived experiences, building durable understanding of how solutes and solvents interact.

• ACARA Content Descriptions
• AC9S5U04

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Solute Testing Stations

Set up stations with water, oil, salt, sugar, sand, and chalk. Small groups add equal amounts of each solute to solvents, stir for one minute, observe changes, and record solubility on charts. Rotate every 10 minutes to test all combinations and discuss patterns.

Explain why some solids dissolve in water while others do not.

Facilitation Tip

During Solute Testing Stations, ensure each station has labeled containers, spoons, and timers so students can compare dissolving rates directly without confusion.

What to look for

Present students with three beakers: one with salt and water, one with sand and water, and one with sugar and water. Ask them to identify the solute and solvent in each beaker and write down which substance they predict will dissolve and why.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Inquiry Circle
• 35 min · Pairs

Fair Test: Temperature Effects

Pairs prepare cold, warm, and hot water samples at safe temperatures. Add identical sugar amounts, time dissolving with stopwatches, and measure maximum solubility by adding until undissolved particles remain. Plot results on class graphs to identify trends.

Analyze how temperature affects the solubility of a solute.

Facilitation Tip

For Temperature Effects, provide identical beakers and a single source of hot water to control variables, helping students focus on temperature as the only changing factor.

What to look for

Pose the question: 'Imagine you are making lemonade. You add sugar to cold water and then to warm water. What do you observe about how quickly the sugar dissolves in each? Explain your observations using the terms solute, solvent, and solubility.'

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 03

• Inquiry Circle
• 30 min · Individual

Prediction Challenge: Particle Size

Individuals predict dissolving times for whole salt crystals versus powdered salt in water. Test predictions by timing both, then share data in whole class discussion to compare averages and refine ideas about surface area.

Predict which substances would dissolve best in a given solvent.

Facilitation Tip

In the Prediction Challenge with Particle Size, give students fine, coarse, and powdered salt so they can observe how smaller pieces expose more surface area to the solvent.

What to look for

Provide students with a scenario: 'You have a new cleaning product that needs to dissolve grease. What type of liquid (solvent) would you suggest it be mixed with, and why? Consider what kinds of substances dissolve well in oil versus water.'

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 04

• Inquiry Circle
• 25 min · Whole Class

Solvent Matching Relay

Divide class into teams. Each team member predicts and tests one solute-solvent pair like flour in water, runs to board to record, and tags next teammate. Review results as a class to vote on best matches.

Explain why some solids dissolve in water while others do not.

Facilitation Tip

During the Solvent Matching Relay, prepare sets of small cups with labeled solvents and solutes so teams rotate efficiently while collecting evidence.

What to look for

Present students with three beakers: one with salt and water, one with sand and water, and one with sugar and water. Ask them to identify the solute and solvent in each beaker and write down which substance they predict will dissolve and why.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

A few notes on teaching this unit

Teachers should start with concrete examples students already know, like sugar in tea, then move to controlled experiments that test their ideas. Avoid rushing to definitions; instead, let students articulate their observations first, then name the parts. Research shows that students learn best when they predict outcomes, test them, and explain discrepancies, not just follow instructions. Use frequent turn-and-talk moments to let students verbalize their thinking before recording it.

Students will explain that dissolving spreads solute particles evenly through a solvent without disappearing forever, and they will use evidence from experiments to predict how temperature, stirring, and particle size affect dissolving rates. Evidence should include clear labels, recorded data, and oral explanations that use these terms accurately.

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Watch Out for These Misconceptions

• During Solute Testing Stations, watch for students saying the solute has 'gone away' when the solution looks clear.

  Use a hand lens to show students that sugar crystals remain in the liquid by evaporating a drop on a microscope slide to reveal crystal formation again.

• During Solvent Matching Relay, listen for students saying 'sand dissolves in water because it mixes.'

  Ask students to pour the sand-water mixture through a filter to show sand remains undissolved, then discuss why particle size and chemical structure matter.

• During Temperature Effects, expect some students to claim heat slows dissolving because ice cubes take longer to melt.

  Provide data from their fair tests and guide students to graph dissolving time against temperature, highlighting that most solids dissolve faster in warm solvents.

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Methods used in this brief

• Stations Rotation
• Inquiry Circle