Reaction Evidence and Energy Worksheet
📝 Worksheet hard ⏱️ 20 minutes 8 problems
Reaction Evidence and Energy Worksheet
Grade 7 Science LearnCrux.com
Name:
Date:
Directions
- Fill in each blank carefully.
- Circle or mark the best answer for each multiple-choice question.
- Match each prompt to the best option before writing your answer.
- Use the larger space to show your thinking on word problems.
1. A reaction that makes a hand warmer heat up gives evidence of an energy __.
2. Which statement best explains why students should use multiple clues before claiming a reaction occurred?
3. Match the observation to the likely meaning: bubbles forming in a new mixture
Match with:
Answer:
4. A process that forms new substances is a chemical __.
5. Why is observation different from inference in reaction work?
6. Which situation most likely involves energy absorbed by a chemical process?
7. Evidence should help students decide whether new __ were formed.
8. Why do reaction explanations improve when students mention both particles and energy?
📋 Teacher Answer Key
1. change
2. One clue alone may not be enough to prove that new substances formed.
3. possible gas product
4. reaction
5. Students observe clues such as bubbles or heat, then infer that a reaction occurred based on that evidence
6. a cold pack becoming cooler
7. substances
8. That combination links visible evidence to a deeper model of how substances and energy change during reactions