Energy in Reactions

Name:

Date:

🔬 Part 1: Reaction Classification

1. During a chemical reaction, calcium chloride dissolves in water and the temperature increases from 20°C to 35°C. This is an:

Exothermic reaction

Endothermic reaction

2. When baking soda and vinegar mix, the temperature drops from 22°C to 18°C. This is an:

Exothermic reaction

Endothermic reaction

3. Which of the following are indicators that energy is being released in a chemical reaction? (Check all that apply)

Temperature increases

Heat can be felt

Temperature decreases

Mixture feels warm

4. A hand warmer packet becomes hot when activated. This is an example of:

Exothermic reaction

Endothermic reaction

📊 Part 2: Observation Recording

5. Complete the observation table from today's demonstrations:

Reaction	Starting Temperature (°C)	Final Temperature (°C)	Exothermic or Endothermic?
Calcium chloride + water	_____	_____	_____________
Baking soda + vinegar	_____	_____	_____________

6. Explain what happens to energy in an exothermic reaction:

7. Explain what happens to energy in an endothermic reaction:

🌟 Part 3: Real-World Applications

8. Give one example of an exothermic reaction you might encounter in everyday life:

Example: ________________________________

Explanation: ____________________________

9. Extension Challenge: Research and explain how energy efficiency considerations apply to exothermic reactions in industry (e.g., combustion engines, manufacturing processes):

10. Success Criteria Check: Can you do the following? (Tick when complete)

I can classify reactions as exothermic or endothermic based on temperature changes

I can explain energy transfer in chemical reactions

I can give real-world examples of both reaction types

Differentiation Support:

• Audio recordings of lesson notes are available on the class portal

• Use the temperature data from class demonstrations if you missed recording your own

• Extension learners: Complete question 9 and research photosynthesis as an endothermic process

Energy in Reactions

Energy in Reactions

🔬 Part 1: Reaction Classification

📊 Part 2: Observation Recording

🌟 Part 3: Real-World Applications

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