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Chemical Reactions and Equations Quiz

Class X
Science
Chemical Reactions and Equations
10 questions
EASY

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1. What is a chemical reaction?

A change in state of matter · A process where substances combine or break apart · A physical change · A measurement of temperature

2. Which of the following is a sign of a chemical reaction?

Change in shape · Change in color · Change in volume · Change in temperature only

3. In a chemical equation, the substances that undergo change are called:

Products · Reactants · Catalysts · Solvents

4. What does the law of conservation of mass state?

Mass can be created or destroyed · Mass is always conserved in a chemical reaction · Mass can change forms · Mass is irrelevant in chemical reactions

5. Which of the following equations is balanced?

H2 + O2 → H2O · 2H2 + O2 → 2H2O · H2 + O2 → 2H2O · H2 + O2 → H2O2