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Environmental Change Investigation
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Environmental Change Investigation
🔍 Part 1: Identifying Changes Around Us
Instructions: Look at each scenario below. Decide if it's a physical change (reversible, no new substance formed) or a chemical change (irreversible, new substance formed).
1. Ice melting on a hot summer day in Auckland
Physical change
Chemical change
2. A piece of paper burning in a campfire
Physical change
Chemical change
3. Salt dissolving in seawater at a New Zealand beach
Physical change
Chemical change
4. An apple turning brown after being cut and left in the air
Physical change
Chemical change
5. Which of these are signs of a chemical change? (Tick all that apply)
Gas bubbles forming
Colour change
Change in shape
Temperature change
New smell produced
📝 Part 2: Environmental Change Investigation
6. Describe one physical change you have observed in your environment (home, school, or outdoors):
7. Explain why this is a physical change using scientific reasoning:
8. Describe one chemical change you have observed in your environment:
9. What evidence tells you this is a chemical change? List at least two observable signs:
🧪 Part 3: Scientific Analysis
10. Complete this sentence: Physical changes are _____________ because _____________.
11. Complete this sentence: Chemical changes are _____________ because _____________.
12. Research Challenge: Choose one environmental change from your observations above. Research and explain why this change is important in nature or everyday life:
✅ Answer Key
1. Ice melting on a hot summer day in Auckland
Correct Answer: Physical change
2. A piece of paper burning in a campfire
Correct Answer: Chemical change
3. Salt dissolving in seawater at a New Zealand beach
Correct Answer: Physical change
4. An apple turning brown after being cut and left in the air
Correct Answer: Chemical change
5. Signs of a chemical change:
Correct Answers: Gas bubbles forming, Colour change, Temperature change, New smell produced
6. Sample Answer: Melting ice in a drink.
7. Sample Answer: Because the ice returns to water when it melts, indicating a physical change.
8. Sample Answer: Rust forming on a bicycle.
9. Sample Answer: Observable signs include colour change (rust) and heat production.
10. Sample Answer: Physical changes are reversible because no new substances are formed.
11. Sample Answer: Chemical changes are irreversible because new substances are created.
12. Sample Answer: The rusting of iron is important because it affects the durability of structures.
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