Chemical Reactions Worksheet
Explore the fundamentals of chemical reactions, including types, indicators, and balancing equations, suitable for Grade 9 science students.
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Chemical Reactions Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. Which of the following is an indicator that a chemical reaction has occurred?
Change in state (solid to liquid)
Formation of a precipitate
Dissolving a solid in a liquid
Heating water to boiling point
2. In the reaction shown, what type of chemical reaction is occurring?
Synthesis reaction
Decomposition reaction
Single displacement reaction
Combustion reaction
3. The law of conservation of mass states that matter cannot be created or during a chemical reaction.
4. A chemical equation is when it has the same number of atoms of each element on both sides of the equation.
5. All chemical reactions release heat.
True
False
6. Catalysts are consumed in a chemical reaction.
True
False
7. Describe the difference between an exothermic and an endothermic reaction.
8. Balance the following chemical equation: H₂ + O₂ → H₂O
Match each term on the left with its definition on the right.
9. Reactants
a. Substances formed in a chemical reaction
10. Products
b. Substances that undergo change in a chemical reaction
11. Catalyst
c. A substance that speeds up a chemical reaction without being consumed