Science · Grade 5

Active learning ideas

Understanding Solutions

Active learning helps students grasp dissolving by letting them see, touch, and measure real mixtures. When students test salt, sugar, sand, and chalk in water, they build mental models that stick because they connect abstract concepts to concrete experiences.

• Ontario Curriculum Expectations
• 5-PS1-2

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Solubility Stations

Prepare four stations with water, solutes (salt, sugar, sand, oil), hot/cold water options, and stirring tools. Students test dissolving at each station, record clarity and settling time, then rotate every 10 minutes. End with a class share-out of patterns noticed.

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

Facilitation Tip

During Solubility Stations, circulate with a checklist to ensure students label cups clearly and record observations for each solute within the 10-minute rotation.

What to look for

Provide students with three unmarked cups containing water, one with dissolved salt, one with sand, and one with sugar. Ask them to observe each mixture and write down which one is a solution and which is a suspension, justifying their answers with one observation for each.

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

Activity 02

• Inquiry Circle
• 30 min · Pairs

Pairs Experiment: Temperature Effects

Pairs dissolve sugar in room-temperature, warm, and hot water, timing how long full dissolving takes. They stir consistently and graph results. Discuss why heat speeds dissolving based on particle movement.

Compare the properties of a solution to those of a suspension.

Facilitation Tip

For Temperature Effects, remind pairs to measure water temperature at the start and after adding solute to control variables in their fair test.

What to look for

On an index card, ask students to draw a simple diagram of a solution and a suspension. Below each diagram, they should write one sentence explaining a key difference between the two types of mixtures.

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

Activity 03

• Inquiry Circle
• 20 min · Whole Class

Whole Class Demo: Solution vs Suspension

Display salt water (solution) and flour water (suspension) on projectors. Students predict properties, observe settling under microscope or magnifier if available, then vote on differences. Follow with solute hunts in classroom items.

Predict how changing the temperature of a solvent will affect the rate of dissolving.

Facilitation Tip

In Solution vs Suspension, pour the mixtures slowly to preserve any settled particles, making the suspension visible for the whole class.

What to look for

Pose the question: 'Imagine you are making lemonade. You add sugar to water. What would happen if the water was very cold versus very warm? Explain your prediction using what you know about dissolving.'

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

Activity 04

• Inquiry Circle
• 25 min · Individual

Individual Challenge: Prediction Sheets

Students predict dissolving for five solutes, test individually with droppers and cups, then check predictions against class data. Shade sheets to show solution or suspension outcomes.

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

Facilitation Tip

For Prediction Sheets, provide sentence stems like 'I think ____ will dissolve fastest because ____' to support written responses.

What to look for

Provide students with three unmarked cups containing water, one with dissolved salt, one with sand, and one with sugar. Ask them to observe each mixture and write down which one is a solution and which is a suspension, justifying their answers with one observation for each.

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

A few notes on teaching this unit

Teach this topic by having students test materials first, then introduce the particle model to explain their observations. Avoid lecturing about solubility before hands-on work, as this can reinforce misconceptions. Use collaborative graphing after experiments to let students discover patterns together, which builds deeper understanding than listening alone.

Successful learning looks like students explaining why some solids dissolve completely while others settle, using observations from their tests. They should connect particle behavior to dissolving rates and link temperature or stirring to changes they see.

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Watch Out for These Misconceptions

• During Solubility Stations, watch for students assuming all solids dissolve equally because they look similar at first glance.

  Use the Solubility Stations to have students group solutes by behavior and describe differences they observe, then revisit their initial ideas with evidence from their tests.

• During Temperature Effects, watch for students believing stirring is required to keep particles dissolved.

  After their pairs experiment, ask students to leave one cup unstirred and compare it to the stirred cup, using their observations to explain that solutions stay dissolved without stirring.

• During Temperature Effects, watch for students thinking hot water dissolves less solute because they confuse dissolving with evaporation.

  Have students graph their class data on dissolving rates at different temperatures, then discuss why the graph shows more solute dissolving in hot water, using particle motion explanations.

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Methods used in this brief

• Stations Rotation
• Inquiry Circle