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Name ______________________________ Class ___________________ Date __________________
Skills Worksheet
7.1 Concept Review
Section: The Nature of Chemical Reactions
1. Identify the reactants and products in the following chemical reaction:
Isooctane and oxygen burn to form carbon dioxide and water. (1 point)
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2. Explain where the energy to cook food comes from when a gas stove burns
natural gas, CH4, and oxygen, O2. (2 points)
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3. Identify the type of energy that is stored in a molecule’s bonds. (1 point)
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4. Describe three signs that a chemical reaction has taken place, and give an
example of each sign. (3 points)
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5. Contrast endothermic and exothermic reactions. (2 points)
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6. Explain why an endothermic reaction might cause a drop in temperature.
(2 points)
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Grading Scale: 0-11 points
A: 10-11
B: 8-9
C: 7
D: 7
F: <6
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science Spectrum
1
Chemical Reactions