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Chemical Reactions Practice

📝 Worksheet medium ⏱️ 18 minutes 8 problems
Chemical Reactions Practice
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. Match the term to its meaning: reactant
Match with:
Answer:
2. A new substance formed in a chemical reaction is a __.
3. Which observation best supports that a reaction may have occurred?
4. Match the term to its meaning: conservation of mass
Match with:
Answer:
5. Why is a particle model useful in chemical reactions?
6. Which change is most likely physical, not chemical?
7. During a reaction, atoms are rearranged rather than __.
8. Why can a reaction in an open container seem to lose mass?
📋 Teacher Answer Key
1. starting substance in a reaction
2. product
3. a new gas forms and temperature changes
4. total mass stays the same in a closed system
5. It helps explain how reactant particles rearrange to form product particles
6. ice melting
7. destroyed
8. Some matter may leave the measured system as a gas even though matter is still conserved overall

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