question7

Question 7

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7.1 An entire sample space is made up of two complementary events, S and T, where P(S’) = 0,33. 7.1.1 Complete the statement: P(S) + P(T) = … (1) 7.1.2 Write down the value of P(T). (1) 7.2 A survey was conducted among 180 residents of a small town to establish how many people contracted … Read more

Question 7

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The following reaction between ammonia and oxygen takes place in a closed systemat constant pressure and temperature: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) 7.1 Define the term activation energy. (2) 7.2 Give a reason why this reaction is exothermic. (1) 7.3 Calculate the heat of reaction. (3) 7.4 Redraw the graph and indicate with … Read more

Question 7

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Read the advertisement below 7.1 Calculate the total amount to be paid over a period of 24 months. (1) 7.2 The monthly instalment, quoted in the advertisement, is calculated on a hire purchase agreement which charges interest of 7,5% p.a. on the cash price of the cellphone. Show that the price of the cellphone is … Read more

Question 7

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QUESTION 7 (Start on a new page.) 7.1 The relationship between conductivity and the concentration of ions in two electrolytes, NaCâ„“(aq) and CaCâ„“ 2 (aq), of the SAME concentration are investigated. 7.1.1 Define the term electrolyte. (2) 7.1.2 Is the water molecule POLAR or NON-POLAR? Give a reason for the answer. (2) 7.1.3 For this … Read more