Science 30 January 1999 Grade 12 Diploma Examination

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Use the following information to answer the next question.Production of EtheneC 2 H 6(g)1100 C C 2 H 4(g) + H 2(g)21. Once ethene is formed from ethane, it can be used for polymerization intopolyethylene. To increase the energy efficiency of ethene production, a chemicalplant couldA. use hydrogen as a fuel to heat the ethaneB. reduce the temperature of the reacting chamberC. reduce the amount of hydrogen produced by the reactionD. sell the hydrogen to a fertilizer plant in exchange for ethane<strong>12</strong>
An important aspect of science literacy is the ability to analyze environmental issues.Use the following information to answer the next question.H 2 S (g) + Pb(CH 3 COO) 2(s)Detection of H 2 S (g)UV PbS (s) + 2 CH 3 COOH (g)(colourless) (colourless) (black) (colourless)22. Hydrogen sulphide (H 2 S (g) ) is a dangerous gas found in “sour” natural gas.H 2 S (g) can be detected using UV light, which will cause H 2 S (g) to react withlead (II) acetate to produce a black compound. This detection can occur becauseUV light has a uniqueA. speedB. sourceC. wavelengthD. temperatureUse the following information to answer the next question.Reaction of H 2 S (g) with WaterH 2 S (g) + H 2 O (l)H 3 O + (aq) + HS– (aq)23. Hydrogen sulphide (H 2 S (g) ) reacts with water in the air to form acid rain. TheBrønsted–Lowry bases in this equation areA. H 2 O (l) and H 2 S (g)B. H 2 O (l) and HS – (aq)C. H 2 S (g) and HS – (aq)D. H 2 S (g) and H 3 O + (aq)13
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Page 13: 15. Sparks from static electricity
Page 18 and 19: 24. The use of pesticides may pose
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Science 30 January 1999 Grade 12 Diploma Examination

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