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5 marksThe Mole Concept

CAPE Chemistry Unit 1 · 2015 · Paper 2 · Question 1(c)

A student is asked to determine the enthalpy of the neutralization reaction between 75 cm³ of 1.00 M hydrochloric acid and 75 cm³ of 1.00 M potassium hydroxide solution. Assume that the densities of the solutions of acid and base and their heat capacities are equal to the density (1 g cm⁻³) and heat capacity (4.18 J g⁻¹ °C⁻¹) of water.

Outline the experimental steps (including calculations) required to obtain an accurate value.

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Other parts of this question

  1. 1(a)(i)Define the term 'bond energy'.[1 mark]
  2. 1(a)(ii)State the relationship between the strength of a covalent bond and its length.[1 mark]
  3. 1(b)(i)Write a balanced equation to represent the reaction above.[2 marks]
  4. 1(b)(ii)Using bond energy values from Table 1, calculate the enthalpy change of reaction, ΔHrxn, for the equation required in (b) (i).[3 marks]
  5. 1(b)(iii)Is the reaction in (b) (i) exothermic or endothermic?[1 mark]
  6. 1(b)(iv)On the axes provided below, draw the energy-profile diagram for the reaction in (b) (i).[2 marks]

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