Safe Experiments

Overview

Lesson 4 of 5 in “Safety First: Science Basics” focuses on running a short, safe investigation using the scientific method. Students work in pairs to apply lab safety rules, measure and record observations, and communicate results.

Learning intentions

• Students will be able to follow established safety procedures during a classroom experiment.
• Students will be able to use the scientific method to plan and conduct an investigation.
• Students will be able to collect relevant data through careful observation and measurement.
• Students will be able to record results clearly and reflect on whether the investigation followed the scientific process.

Success criteria

• I can follow safety rules (including PPE, safe handling, and material disposal) throughout the experiment.
• I can work safely and respectfully with my partner, sharing roles and responsibilities.
• I can record observations and measurements in an organized table using appropriate units.
• I can explain how my procedure relates to the scientific method (question, hypothesis, method, results, conclusion).

Curriculum links

• Inquiry and investigation: planning and conducting investigations using scientific process skills.
• Safety and responsible behaviour: demonstrating safe practices when using materials and tools.
• Data management and scientific communication: recording observations, organizing data, and communicating findings.
• Connections to the science classroom: understanding how safety supports reliable results.

Lesson structure (45 minutes)

1. 0–5 min: Safety check-in and goals

• Teacher reviews key lab safety expectations for Grade 8: wearing required PPE, reading labels, not eating/drinking, safe tool use, and cleanup routines.
• Students preview today’s investigation roles (materials manager, recorder, timekeeper).

2. 5–10 min: Scientific method mini-brief

• Teacher models a “question → hypothesis → procedure → results → conclusion” flow using a brief example.
• Students identify the variables for today’s investigation (what changes, what is kept the same, what is measured) and connect this to making results trustworthy.

3. 10–15 min: Form pairs and assign roles

• Students partner up and receive an activity sheet with a short procedure and data table.
• Pairs do a quick “procedure run-through” (verbal rehearsal) before touching materials, confirming steps match the written method.

4. 15–30 min: Conduct the experiment

• Students carry out the investigation according to the provided procedure.
• Teacher circulates, observing safety behaviours, correct measurement technique, and accurate recording.
• Students collect data, repeat where required by the procedure (e.g., multiple trials), and note any anomalies.

5. 30–38 min: Organize results

• Pairs transfer raw observations into the data table (with units) and ensure measurements are readable.
• Students write a short statement answering: What did we observe? What did our hypothesis predict compared to our results?

6. 38–43 min: Pair share and quick safety reflection

• Each pair shares one safety success (e.g., correct PPE use, careful handling) and one science improvement (e.g., clearer measurements, better control of variables).
• Teacher highlights how following safety procedures supports accurate, reliable results.

7. 43–45 min: Exit ticket

• Students complete a short exit ticket: “One safety rule I followed well was… One part of the scientific method I used was…”
• Teacher collects for formative assessment.

Resources

• Prepared lab materials for a simple Grade 8 investigation (teacher pre-set benches)
• Student activity sheet with procedure summary and blank data table
• Safety rules poster and PPE check (goggles, lab apron, gloves as needed)
• Measuring tools appropriate to the activity (e.g., rulers, measuring cups/spoons, thermometer if used, stopwatch)
• Lab notebooks or lined paper for supporting notes
• Waste and cleanup supplies (designated bins, paper towels)
• Timer for trials and step reminders
• Teacher safety checklist for circulating and observing

Assessment

• Formative observation: teacher checklist of safety behaviours during setup and experiment.
• Data review: teacher checks that students record measurements with units and organize results.
• Exit ticket: assesses understanding of safe procedure use and scientific method components.

Differentiation

• Support for ESL learners
• Provide sentence frames for hypothesis, results, and conclusion (e.g., “My hypothesis was… Our results showed…”).
• Use visuals on the activity sheet (icons for PPE, measurement steps, and data table headings).
• Repeat key safety phrases and model them during the mini-brief; allow students to rehearse the procedure verbally.
• Support for learners who need additional scaffolding
• Provide a partially completed data table for some students (missing units prompts, pre-labeled columns).
• Assign roles with clear responsibilities and checklists (materials manager vs recorder vs timekeeper).
• Extension for advanced learners
• Challenge students to identify at least one potential source of error and suggest how to improve the procedure.
• Ask for a “control variable explanation” (how a specific variable was kept the same).
• SEN considerations
• Offer reduced writing demand by allowing brief bullet responses for the exit ticket.
• Seat students strategically to reduce distraction during active lab time; offer teacher proximity during measurement steps.