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Enthalpy Multiple Choice Questions for Higher Chemistry Unit 2 Section 2

Practice multiple choice questions on enthalpy in reactions for students. Includes diagrams and explanations. Ideal for teachers and students alike.

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Enthalpy Multiple Choice Questions for Higher Chemistry Unit 2 Section 2

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  1. Higher Chemistry Unit 1Section 2 EnthalpyMultiple Choice Questions This is designed to be used by teachers to help students develop skills in answering multiple choice questions. Douglas Racey, Waid Academy, Anstruther, Fife, Scotland

  2. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 1. The potential energy diagram for the reaction CO(g) + NO2(g)  CO2 (g) + NO(g) is shown. DH, in kJmol-1, for the forward reaction is A. -361 B. -227 C. -93 D. +361 A. Answer

  3. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 2. The enthalpy of neutralisation in an acid/alkali reaction is always the energy released in A. the neutralisation of one mole of acid B. the neutralisation of one mole of alkali C. the formation of one mole of water D. the formation of one mole of salt D. Answer

  4. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 3. Ethanol­ (C2H5OH) has a different enthalpy of combustion from diethyl ether (CH3OCH3) because the compounds have different A. molecular masses B. bonds within the molecules C. products of combustion D. boiling points B. Answer

  5. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 4. Which of the following represents an exothermic change? A. O2(g)  2O(g) B. CH4(g)  C(g) + 4H(g) C. 2N(g)  N2(g) D. H2O(g)  2H(g) + O(g) C. Answer

  6. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 5. The enthalpy change for the forward reaction can be represented by A. x B. y C. x + y D. x - y D. Answer

  7. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 6. The enthalpy of combustion of methanol is -715 kJ mol-1. The mass of methanol which has to be burned to produce 71.5 kJ is A. 3.2g B. 32g C. 71.5g D. 715g A. Answer

  8. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 7. A group of students added 6 g of ammonium chloride crystals to 200 cm3 of water at a temperature of 25oC. The enthalpy of solution of ammonium chloride is +13.6 kJ mol-1. After dissolving the crystals, the temperature of the solution would most likely be A. 30oC B. 27oC C. 26oC D. 23oC D. Answer

  9. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 8. Which equation illustrates an enthalpy of combustion? A. C2H5OH + O2 CH3COOH + H2O B. CH3CHO + ½ O2 CH3COOH C. C2H6 + 3 ½ O2 2CO2 + 3H2O D. CH4 + 1 ½ O2 CO + 2H2O C. Answer

  10. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 9. When 3.6 g of butanal (relative formula mass = 72) was burned, 134 kJ of energy was released. From this result, what is the enthalpy of combustion, in kJ mol-1? A. -6.7 B. +6.7 C. -2680 D. +2680 C. Answer

  11. Higher Chemistry Unit 2 - Section 2 EnthalpyMultiple Choice Questions 10. The activation energy for the forward reaction shown in the diagram below can be represented by A. x B. y C. x+y D. x-y A. Answer

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