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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) _______________________________________________________________ _______________________________________________________________ 2. Explain where the energy to cook food comes from when a gas stove burns natural gas, CH4, and oxygen, O2. (2 points) _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 3. Identify the type of energy that is stored in a molecule’s bonds. (1 point) _______________________________________________________________ 4. Describe three signs that a chemical reaction has taken place, and give an example of each sign. (3 points) _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 5. Contrast endothermic and exothermic reactions. (2 points) _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 6. Explain why an endothermic reaction might cause a drop in temperature. (2 points) _______________________________________________________________ _______________________________________________________________ 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