Heat Energy Changes in Chemical Reactions Quiz
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5 questions, one answer each
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1. What is an exothermic reaction?
- A. A reaction that takes in heat energy from the surroundings
- B. A reaction that gives out heat energy to the surroundings
- C. A reaction with no energy change
- D. A reaction that only occurs in solution
2. Is breaking a chemical bond an exothermic or endothermic process?
- A. Exothermic
- B. Endothermic
- C. Neither, it releases no energy and needs none
- D. It depends on the element
3. On a reaction profile, how is the activation energy shown?
- A. The full height of the hump from the x-axis
- B. The height of the hump above the reactants' energy level
- C. The difference between reactant and product energy levels
- D. The width of the hump along the x-axis
4. A student measures the temperature of a solution rising when two chemicals are mixed. What does this indicate about the reaction?
- A. The reaction is endothermic
- B. The reaction is exothermic
- C. No reaction has occurred
- D. The reaction has stopped
5. A reaction has a total bond-breaking energy of 950 kJ/mol and a total bond-making energy of 1120 kJ/mol. What can be concluded?
- A. The reaction is endothermic, releasing 170 kJ/mol
- B. The reaction is exothermic, releasing 170 kJ/mol overall
- C. The reaction is exothermic, releasing 2070 kJ/mol overall
- D. No conclusion can be drawn without a reaction profile