Chemical Change Worksheet
Explore the principles of chemical change, including types of reactions, energy changes, and factors affecting reaction rates, suitable for Grade 12 Chemistry.
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Chemical Change 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 NOT an indicator of a chemical change?
Formation of a precipitate
Change in color
Change in state (e.g., melting ice)
Evolution of gas
2. What type of reaction is represented by the equation: AB + CD → AD + CB?
Synthesis
Decomposition
Single displacement
Double displacement
3. A chemical reaction that releases energy in the form of heat is called an reaction.
4. The minimum energy required to initiate a chemical reaction is known as the .
5. Catalysts are consumed during a chemical reaction.
True
False
6. Increasing the surface area of a reactant will generally decrease the rate of reaction.
True
False
7. Differentiate between an endothermic and an exothermic reaction.
8. List three factors that can affect the rate of a chemical reaction and briefly explain how each factor influences the rate.
Match each term on the left with its definition on the right.
9. Catalyst
a. Speeds up a reaction without being consumed
10. Activation Energy
b. Minimum energy to start a reaction
11. Reactant
c. Substance present at the start of a reaction
12. Product
d. Substance formed at the end of a reaction
13. Observe the image below, which depicts a thermite reaction. Based on your understanding of chemical changes and energy transformations, describe why this reaction is classified as a chemical change and discuss its energy profile (i.e., is it endothermic or exothermic?).
