Enthalpy Quiz

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1. Which of the following is used to calculate the change in enthalpy?

  • Σ(heat content of the products) x Σ(heat content of the reactants).
  • Σ(heat content of the products) - Σ(heat content of the rectants).
  • Σ(heat content of the reactants) - Σ(heat content of the products).
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2. What is enthalpy change of formation?

  • Tthe enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mole of water.
  • The enthalpy change of a compound when one mole of the compound, in its standard state, is formed from its constituent elements in their standard states.
  • The enthalpy change that takes accompanies a rection in the molar quantities expressed in a chemical equation under standard conditions.
  • The enthalpy change that takes place when one mole a substance reacts completly with oxygen under standard conditions.

3. When 1.0 mole of ZnO(s) decomposes, the ΔH = 348 kJ/mol of heat energy. What does this tell you about the formation of ZnO(s)?

  • The formation of ZnO(s) is exothermic.
  • The formation of ZnO(s) is endothermic.
  • The formation of ZnO(s) does not require energy.

4. Under what set of standard conditions do standard enthalpies occur?

  • A stated temperature of 298 K (25°C), a pressure of 100 kPa (1 atmosphere) and a concentration of 1.0 mol dm−3 (for reactions with aqueous solutions).
  • A stated temperature of 298 K (25°C), a pressure of 100 kPa (1 atmosphere) and a concentration of 2.0 mol dm−3 (for reactions with aqueous solutions).
  • A stated temperature of 297 K (24°C), a pressure of 100 kPa (1 atmosphere) and a concentration of 1.0 mol dm−3 (for reactions with aqueous solutions).
  • A stated temperature of 297 K (24°C), a pressure of 100 kPa (2 atmosphere) and a concentration of 2.0 mol dm−3 (for reactions with aqueous solutions).

5. What does Hess' Law state?

  • If a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route.
  • When a system in dynamic equilibrium is subjected to a change, the point of equilibrium will shift to minimise the change.
  • No materials are being added or taken away from a system in equilibrium, and no external conditions, such as temperature or pressure, are altered.
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