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ZIMSEC O-Level Chemistry

Enthalpy changes

Enthalpy changes in ZIMSEC O-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic20 practice questions1 lesson
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Overview

Form 4 (competency matrix 8.22.1): enthalpy changes of combustion, neutralisation and solution.

Learning objectives

What the syllabus expects you to be able to do.

  1. 7.1.9.5Describe the concept of enthalpy change, including enthalpy changes of combustion, neutralisation and solution.
  2. 7.1.9.6Determine enthalpy changes by experiment.
  3. 7.1.9.7Calculate enthalpy changes using q = mcΔT, taking the mass of a solution from its volume.

Lessons

  • Measuring enthalpy changes

    40 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Enthalpy changes: sample question

1 mark

Calculate the energy, in joules, needed to raise the temperature of 100 g of water by 15.0 °C. (Specific heat capacity of water = 4.2 J/g/°C.)

Answer in J.

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