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ZIMSEC O-Level Chemistry

Heating and cooling curves

Heating and cooling curves in ZIMSEC O-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic40 practice questions2 lessons
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Overview

Form 4 (competency matrix 8.18.1), including the effect of impurities on melting and boiling points.

Learning objectives

What the syllabus expects you to be able to do.

  1. 7.1.2.5Interpret heating and cooling curves.
  2. 7.1.2.6Describe how impurities affect melting points and boiling points.

Lessons

  • Heating and cooling curves

    25 min

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  • Purity: melting points and boiling points

    25 min

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Sample question

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

Exam style

Heating and cooling curves: sample question

1 mark

The heating curve of a pure substance has two flat sections, one at 17 ∘C17\ ^\circ\text{C} and one at 118 ∘C118\ ^\circ\text{C}. What is the boiling point of the substance?

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