🔬 Part 1: Understanding Energy Changes

1. Complete the definitions using the words below:

Words: heat, releases, absorbs, increases, decreases

Exothermic reaction: A reaction that __________ energy to the surroundings. The temperature __________.

Endothermic reaction: A reaction that __________ energy from the surroundings. The temperature __________.

2. Circle the correct answer for each reaction:

a) Hand warmers that heat up when activated:

Exothermic

Endothermic

b) Ice melting on a hot day:

Exothermic

Endothermic

c) Burning wood in a fireplace:

Exothermic

Endothermic

d) Instant cold packs used for sports injuries:

Exothermic

Endothermic

📊 Part 2: Observation and Analysis

3. During our class experiment, record your temperature observations:

Calcium chloride + water:

Starting temperature: ____°C Final temperature: ____°C

Temperature change: ____°C Type of reaction: ______________

Baking soda + vinegar:

Starting temperature: ____°C Final temperature: ____°C

Temperature change: ____°C Type of reaction: ______________

4. Explain what happens to energy in each type of reaction:

5. Give two real-world examples of each type of reaction:

Exothermic reactions:

1. _________________________________

2. _________________________________

Endothermic reactions:

1. _________________________________

2. _________________________________

🎯 Part 3: Application and Extension

6. A student mixes two chemicals and notices the test tube becomes very hot. Tick all statements that are correct:

This is an exothermic reaction

Energy is being released to the surroundings

The reaction is absorbing heat from the surroundings

The temperature of the surroundings increases

7. Extension Challenge: Research and describe one industrial process that uses either an exothermic or endothermic reaction. Explain why understanding energy changes is important in this process:

8. Success Criteria Check: Tick when you can do each skill:

I can describe the difference between exothermic and endothermic reactions

I can classify reactions based on temperature changes

I can explain energy transfer in chemical reactions

I can give real-world examples of both reaction types

Exothermic vs Endothermic Reactions

Exothermic vs Endothermic Reactions

🔬 Part 1: Understanding Energy Changes

📊 Part 2: Observation and Analysis

🎯 Part 3: Application and Extension

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