Testing Water Quality to Solve Factory Mystery
Grade 5 · Science · 45 minutes
Objective
Students will analyze water samples using observation and testing to determine pollution sources and effects on ecosystems
Materials
- Clear plastic cups
- Water
- Food coloring
- Cooking oil
- Small pieces of paper
- Magnifying glasses
Hook
The town's fish are mysteriously dying in Crystal Lake, and three factories nearby claim they're not responsible. As environmental detectives, you must test water samples from each factory's drainage area to solve this ecological mystery.
Main Activity
Students work in teams of three detectives, each receiving water samples labeled Factory A, B, and C (clear water, water with food coloring, and water with oil). They observe each sample's color, smell, and clarity using magnifying glasses and record findings on detective report sheets. Teams test how paper dissolves differently in each sample and discuss which properties might harm aquatic life. They compare their findings with a control sample of clean lake water, then present their conclusions about which factory is the pollution source and why.
Discussion Questions
- What observable properties helped you identify the polluted water samples?
- How might each type of pollution affect the fish and plants living in Crystal Lake?
- What evidence would you present to convince the town council about the pollution source?
- How could the responsible factory change their practices to protect the lake?
- What other tests might real environmental scientists use to detect water pollution?
Exit Ticket
Write one sentence explaining which factory you think is causing the fish deaths and one piece of evidence that supports your conclusion
Differentiation
Support: Provide a checklist of specific observations to look for in each water sample and sentence starters for recording findings
Extension: Challenge students to research real water quality tests and design additional experiments using safe materials to detect other types of pollution
