Energy in Reactions Worksheet
Grade 11 Chemistry worksheet covering endothermic and exothermic reactions, enthalpy changes, activation energy, and reaction profiles.
Includes
Standards
Topics
Energy in Reactions
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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 best describes an exothermic reaction?
A reaction that absorbs heat from its surroundings.
A reaction that releases heat to its surroundings.
A reaction that only occurs at high temperatures.
A reaction that forms a precipitate.
2. What is the sign of ΔH (enthalpy change) for an endothermic reaction?
Positive
Negative
Zero
Depends on the reaction
3. The minimum energy required to initiate a chemical reaction is called the .
4. In an exothermic reaction, the products have energy than the reactants.
5. Distinguish between an endothermic and an exothermic reaction, providing an example for each.
6. Draw a reaction profile diagram for an exothermic reaction. Label the reactants, products, activation energy, and enthalpy change (ΔH).
7. Catalysts increase the activation energy of a reaction.
True
False
Match the term with its definition.
8. Enthalpy
a. Energy released or absorbed during a chemical reaction.
9. Activation Energy
b. The total heat content of a system.
10. ΔH
c. Minimum energy required to start a reaction.