Energetics Quiz
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5 questions, one answer each
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1. What happens to the temperature of the surroundings during an exothermic reaction?
- A. It increases
- B. It decreases
- C. It stays constant
- D. It fluctuates randomly
2. What is the specific heat capacity of water used in Q = mcT calculations?
- A. 1 J/g°C
- B. 2.1 J/g°C
- C. 4.2 J/g°C
- D. 10 J/g°C
3. A student adds 0.02 mol of a solid to water and measures a heat energy release of 1680 J. What is the molar enthalpy change?
- A. +84 kJ/mol
- B. -84 kJ/mol
- C. -33.6 kJ/mol
- D. +33.6 kJ/mol
4. On an energy level diagram for an endothermic reaction, how are the reactants and products positioned?
- A. Reactants higher than products
- B. Products higher than reactants
- C. Reactants and products at the same level
- D. Products first decrease then increase
5. Using bond energies, a reaction requires 950 kJ/mol to break all reactant bonds and releases 1100 kJ/mol making product bonds. What can be concluded?
- A. The reaction is endothermic, ΔH = +150 kJ/mol
- B. The reaction is exothermic, ΔH = -150 kJ/mol
- C. The reaction is exothermic, ΔH = -2050 kJ/mol
- D. No overall energy change occurs