The balanced chemical equation for the EXTRACTION of gold from its ore is as follows: 10.1 State ONE disadvantage of using cyanide (CN– ) in the extraction of gold. (1) 10.2 Will the final solution of the extraction process be ACIDIC or BASIC (ALKALINE)? Give a reason for the answer. (2) 10.3 Determine the oxidation … Read more
Choose ONE of the following topics and write a short text. The body of your response should be between 80 and 100 words in length. Write down the number and the heading of the text you have chosen, e.g. 3.1 DIARY ENTRY Spend approximately 30 minutes on this section. 3.1 DIARY ENTRY Your Grade 10 … Read more
The unbalanced equations for two redox reactions, in which SO2 is involved, are shown below. 9.1 Explain what is meant by the term redox reaction. (2) 9.2 Write down the oxidation number of Mn in: 9.2.1 KMnO4 (1) 9.2.2 MnSO4 (1) 9.3 Is Mn in Reaction 2 OXIDISED or REDUCED? Give a reason for the … Read more
Respond to ONE of the following transactional writing tasks. The body of your response should be between 120 and 150 words in length. Write down the number and the heading of the text you have chosen, e.g. 2.1 FRIENDLY LETTER. Pay particular attention to format, language and register. Spend approximately 40 minutes on this section. … Read more
8.1 Consider the balanced equations for the reaction of water with nitric acid and ammonia below 8.1.1 Define an acid in terms of the Lowry-Brønsted theory. (2) 8.1.2 Write down the FORMULA of ONE conjugate acid-base pair in Reaction 1. (2) 8.1.3 Is the solution formed in Reaction 1 ACIDIC or BASIC (ALKALINE)? Give a … Read more
The balanced equation for the reaction of carbon with steam is as follows: C(s) + H2O(g) → CO(g) + H2(g) The graph below, NOT drawn to scale, represents the change in potential energy ofthe substances during the reaction. 7.1 Define the term heat of reaction. (2) 7.2 Is the reaction ENDOTHERMIC or EXOTHERMIC? Give a … Read more
6.1 Potassium permanganate, KMnO4, burns with a bright flame when a few drops of glycerine are added to it. The incomplete equation for the reaction is: 6.1.1 Define the term molar mass. (2) 6.1.2 The composition of glycerine is as follows: 39,13% carbon; 8,7% hydrogen; 52,17% oxygen Determine the EMPIRICAL formula of glycerine. Show ALL … Read more
Write an essay of between 150 and 200 words in length on ONE of the followingtopics. Write down the number and title of the essay you have chosen correctly,e.g. 1.1 My dreams for the year, 2022. Give your own title if your choice is QUESTION 1.7.1 OR 1.7.2. Spend approximately 50 minutes on this section. … Read more