Grade 11 Physical Science 2016 Paper 2

The discovery of gold played a significant role in the economic development of SouthAfrica. In 1970 gold mining in South Africa contributed 68 per cent to global production. 10.1 Which TWO mining methods are used in South Africa? (2) 10.2 Give TWO reasons why mining is important for the South African economy. (2) 10.3 State … Read more

A silver Christmas tree can be made by placing copper wire, shaped in the form ofa tree, into a silver nitrate solution. The unbalanced equation for the reaction is: Cu(s) + AgNO3(aq) → Cu(NO3)2(aq) + Ag(s) 9.1 Define the term oxidation in terms of oxidation number. (2) 9.2 Write down the following for the reaction … Read more

8.1 Define an acid in terms of the Lowry-Brønsted theory. (2) 8.2 Consider the following acid-base reaction: H2PO4+ NH3 → HPO42- + NH4+ 8.2.1 Identify the conjugate acid-base pairs in the above reaction. (4) 8.2.2 Define the term ampholyte. (1) 8.2.3 Choose an ampholyte in the above reaction. (2) 8.3 Ten grams (10 g) of … Read more

Methane is used as an alternative fuel. The combustion of methane releases carbondioxide and water. The balanced equation for this reaction is:CH4(g) + O2 (g) → CO2 (g) + 2H2O (g) + 891 kJ.mol-1 The activation energy for this reaction is 172 kJ.mol-1. 7.1 Is this reaction ENDOTHERMIC or EXOTHERMIC? Give a reason for theanswer. … Read more

Learners made a mini volcano in a science laboratory by adding sodium bicarbonate toethanoic acid. They added 100 mℓ of a 0,2 mol. dm-3 ethanoic acid solution to 10 g of NaHCO3 to start the reaction of the volcano.The balanced equation for this reaction is: CH3COOH(aq) + NaHCO3(s) → CH3COONa(aq) + H2O(l) + CO2(g) 6.1 … Read more

5.1 Define the term concentration. (2) 5.2 Eight (8) grams of Na2S2O3 is dissolved in water to prepare 500 cm3 ofsolution. Calculate the concentration of the Na2S2O3 solution. (3) 5.3 A 10 g sample of a compound contains 2,66 g of potassium, 3,54 g ofchromium and 3,81 g of oxygen. 5.3.1 Define the term empirical … Read more

4.1 Charles’ Law describes the relationship between the volume and temperatureof an enclosed mass of gas at constant pressure. The volumes of a gas atdifferent temperatures at constant pressure are given in the table below. 4.1.1 Explain Charles’ Law in terms of the kinetic molecular theoryof gases. (2) 4.1.2 Draw a graph of volume versus … Read more