Energy in Chemical Reactions
Explore the concepts of endothermic and exothermic reactions, activation energy, and factors affecting reaction rates.
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Energy in Chemical Reactions
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Read each question carefully and provide your best answer. 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 creates energy.
A reaction that requires a catalyst to occur.
2. What is activation energy?
The energy released during a chemical reaction.
The minimum energy required for a reaction to occur.
The energy of the products in a reaction.
The energy of the reactants in a reaction.
3. In an endothermic reaction, the temperature of the surroundings will .
4. A substance that speeds up a chemical reaction without being consumed is called a .
5. All chemical reactions involve a change in energy.
True
False
6. Increasing the concentration of reactants generally decreases the reaction rate.
True
False
7. Describe the difference between an endothermic and an exothermic reaction in terms of energy flow and temperature change.
8. Analyze the energy diagram below. Is this reaction endothermic or exothermic? Explain your reasoning.
Match the term with its definition.
9. Catalyst
a. Energy required to start a reaction
10. Endothermic
b. Releases heat
11. Exothermic
c. Absorbs heat
12. Activation Energy
d. Speeds up a reaction
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