REVIS - A student was investigating the electrolysis of...

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Unformatted text preview: A student was investigating the electrolysis of sodium chloride solution (brine) using this apparatus. gas B negative electrode plastic bottle gas A positive electrode rubber bung sodium chloride solution (brine) + - (a) Use words from the list to answer this question: carbon dioxide chlorine hydrogen nitrogen oxygen sulphur dioxide (i) When damp blue litmus paper was held in gas A it lost its colour (was bleached). The name of gas A is ........................................................................................ [1]- (ii) Gas B pops when a lighted splint is held above the tube. The name of gas B is ........................................................................................ [1]- (b) At the start of the experiment the sodium chloride solution was neutral. At the end of the experiment the solution in the plastic bottle had a pH of 10. What has happened to the solution? 1 ..................................................................................................................................... [1]- (c) The table shows some of the products made from chloride, hydrogen and sodium hydroxide. Complete the table using words from the list. chlorine hydrogen sodium hydroxide SUBSTANCE USED FOR hardening vegetable oil making PVC and solvents making soaps and detergents [2]- (d) Chlorine is used for treating water for drinking and in swimming pools. Why? ..................................................................................................................................... [1] Total 6 marks- Crude oil contains a number of compounds. These compounds are not joined together chemically. (a) Draw a ring around the best description of crude oil: compound element fraction mixture [1]- (b) Crude oil is separated into fractions by fractional distillation. The table below shows the percentage of each fraction in North Sea crude oil. FRAC T I PERCENTAGE (%) IN NORTH SEA CRUDE OIL 2 O N Gas 3 Petrol 7 Napth a 10 Kerosi n e 15 Gas oi l 20 Fuel oi l 45- The bar chart shows the percentage of each fraction an oil company uses. Use the data in the table to complete the bar chart with the percentage of each fraction in North Sea crude oil. The bars for gas and petrol have been done for you. 3 gas petrol naphtha kerosine gas oil fuel oil 45 40 35 30 25 20 15 10 5 Percentage (%) Fractions in crude oil Percentage of each fraction in North Sea crude oil Percentage of each fraction oil company uses [2]- (c) (i) Use information from the bar chart to help you answer this question. The oil company uses more of one of the fractions than they can obtain by distillation of North Sea crude oil. Name this fraction .......................................................................................
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This note was uploaded on 03/09/2011 for the course ENGLISH 2012 taught by Professor Ffaf during the Spring '03 term at Cambridge.

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REVIS - A student was investigating the electrolysis of...

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