🎯 Learning Intentions & Safety

Today I will learn to:

• Use red cabbage indicator to test different substances
• Record colour changes accurately
• Identify evidence of acidic and basic properties
• Carry out a fair scientific investigation

Safety Reminders:

🔮 Predictions

Sample A (Lemon juice): ________________

Sample B (Baking soda solution): ________________

Sample C (Water): ________________

Sample D (Vinegar): ________________

Sample E (Mystery sample 1): ________________

Sample F (Mystery sample 2): ________________

🔬 Method & Variables

Independent variable (what we change): ________________

Dependent variable (what we measure/observe): ________________

Controlled variables (what we keep the same): ________________

📊 Results Table

Colour Key for Red Cabbage Indicator

(Your teacher will help you complete this colour scale)

🧠 Analysis Questions

📝 Conclusion

In our investigation, the red cabbage indicator changed from _________ to _________ when mixed with acidic substances.

The indicator changed from _________ to _________ when mixed with basic substances.

This evidence suggests that _________________________________

______________________________________________________

👩‍🏫 Teacher Notes & Suggested Answers

(Remove this section before printing for students)

Expected Results:

• Lemon juice & vinegar: Red/pink colours (acidic)

• Baking soda solution: Blue/green colours (basic)

• Water: Purple (neutral, close to original indicator colour)

Key Teaching Points:

• Colour change indicates chemical interaction, not necessarily formation of new substance

• Red cabbage contains anthocyanins that change structure in different pH conditions

• Students should use cautious language: "suggests", "appears to be", "evidence indicates"

Assessment Focus:

• Accurate observations vs predictions

• Understanding of controlled variables

• Use of evidence to support conclusions

• Recognition of investigation limitations