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CHEMISTRY FORM 1


i Common Chemistry Laboratory Chemicals
ii Common Chemistry Laboratory Apparatus
iii Safety in the Chemistry Laboratory
iv Why we should learn Chemistry
1. INTRODUCTION TO CHEMISTRY
2. SIMPLE CLASSIFICATION OF SUBSTANCES AND SEPERATION OF MIXTURES
3. ACIDS, BASES AND INDICATORS
4. AIR AND COMBUSTION
5. WATER AND HYDROGEN
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Simple Classification of Substances and Separation of Mixtures: Effect of heat on physical states

2.0 Simple Classification of Substances and Separation of Mixtures


2.13 Effect of heat on physical states

Open the video below, effect of heat on physical states

(courtesy Youtube - Science Experiment | Physics | Heating Changes the state of a substance by LearnNext). Note the changes that occur during the heating of ice water and candle wax.

Questions 2.13


  1. The changes that occur during heating and cooling can be summarized as follows.
    1. Identify the direction which represents heating in this diagram (whether from right to left or the other way round).
    2. Name the physical states labelled K and L. K --- L ---
    3. Name the processes represented by A to D.
  2. A------- B------ C------D ------- or -------
  3. For process C, state the corresponding possible names of K.
  4. Explain in terms of the kinetic theory the changes that occur during process
    1. A ------------
    2. B ------------
    3. C ------------
    4. D ------------
  5. For some substances, the solid state changes directly to L.
    1. Name the process in which a substance changes directly from solid to L.
    2. Name three substances which behave in the manner described.
    3. State the process that involves change from L directly to solid.
    4. What is the general name of the solid formed directly from L?

Answers to Questions 2.13