Grade 12 Physical Science 2018 Paper 1

Question 10

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In the flow diagram below, I and II represent industrial processes used in the fertiliser industry. P and Q are chemical reactions that take place to produce ammonium sulphate and fertiliser Y respectively. 10.1 Write down the name of the industrial process: 10.1.1 I (1) 10.1.2 II (1) 10.2 Write down the NAME or FORMULA … Read more

Question 6

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Dinitrogen tetraoxide, N2O4(g), decomposes to nitrogen dioxide, NO2(g), in a sealed syringe of volume 2 dm3. The mixture reaches equilibrium at 325 °C according to the following balanced equation: When equilibrium is reached, it is observed that the colour of the gas in the syringe is brown. 6.1 State Le Chatelier’s principle. (2) 6.2 The … Read more

Question 5

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The reaction of zinc and EXCESS dilute hydrochloric acid is used to investigate factors that affect reaction rate. The balanced equation for the reaction is: The reaction conditions used and the results obtained for each experiment are summarised in the table below.  The same mass of zinc is used in all the experiments. The zinc … Read more

Question 4

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4.1 Three reactions of organic compounds from the same homologous series are shown below.  4.1.1 Define a homologous series.       (2) 4.1.2 Name the type of reaction represented by I.       (1) 4.1.3 Write down the formula of the inorganic compound P.         (1) 4.1.4 Give the structural formula of a POSITIONAL isomer of   2-bromobutane.        … Read more

Question 3

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The boiling points of different organic compounds are given below.  3.1 Define boiling point.         (2) 3.2 Write down the: 3.2.1 Name of the FUNCTIONAL GROUP of these compounds            (1) 3.2.2 IUPAC name of compound C      (1) 3.2.3 Structural formula of the FUNCTIONAL isomer of compound B      (2) 3.3 Which ONE of … Read more