Chemical Reactions Energy Worksheet

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Date:

🔥 Part 1: Energy in Chemical Reactions

Starter Question: When you strike a match, it gets hot and produces light. What type of energy change is happening?

1. Which statement best describes an exothermic reaction?

Heat energy is absorbed from surroundings

Heat energy is released to surroundings

No energy change occurs

Temperature stays constant

2. Select ALL examples of endothermic reactions:

Photosynthesis in plants

Burning wood

Cooking an egg

Fireworks exploding

3. Complete the sentence: In an endothermic reaction, the temperature of the surroundings will _________ because energy is being _________.

4. Which type of reaction requires continuous energy input to keep going?

Exothermic reaction

Endothermic reaction

Both types

Neither type

⚗️ Part 2: Types of Reactions & Word Equations

5. Write word equations for these reactions:

a) Zinc displaces copper from copper sulfate solution:

________ + copper sulfate → ________ + ________

b) Hydrogen peroxide decomposes into water and oxygen:

________ → ________ + ________

6. Observation Task: Describe what you would observe during these reactions:

Iron + Copper Sulfate → Iron Sulfate + Copper

7. Real-world Application: Explain why understanding exothermic reactions is important for:

a) Fire safety:

b) Food preservation:

🧠 Part 3: Reflection & Extension

8. Thinking Question: A student mixes two chemicals and notices the test tube becomes very cold. What can you conclude about this reaction? Explain your reasoning.

9. Extension Challenge: Research and name one industrial process that uses:

An exothermic reaction: ________________

An endothermic reaction: ________________

10. Success Check: Rate your understanding (1-5 scale):

Energy changes in reactions: ___/5

Writing word equations: ___/5

Types of chemical reactions: ___/5

What would help improve your understanding?

Chemical Reactions Energy Worksheet

Chemical Reactions Energy Worksheet

🔥 Part 1: Energy in Chemical Reactions

⚗️ Part 2: Types of Reactions & Word Equations

🧠 Part 3: Reflection & Extension

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