Find the аreа оf the regiоn thаt is bоunded by the polar curve.
Questiоn 3 This questiоn is аbоut cаlcium compounds. а The diagram gives information about the reactions of some calcium compounds used to make mortar. Mortar contains calcium hydroxide and is used to join bricks together when building walls. See addendum under question 3. Figure 3a These reactions occur when the calcium hydroxide in mortar is obtained from calcium carbonate. calcium carbonate is strongly heated to form calcium oxide water is added to calcium oxide to form calcium hydroxide The calcium hydroxide in mortar reacts with carbon dioxide from the atmosphere to form calcium carbonate. The equation for one of these reactions is CaO + H2O → Ca(OH)2 Calculate the mass of water needed to react exactly with 28 kg of calcium oxide. mass of water ........................................................... (3) b Calcium carbide is a reactive solid. When water is added to it, a gas (ethyne) is formed. A teacher uses this apparatus to investigate the rate of reaction between calcium carbide and water. See addendum under Question 3 Figure 3b1 This is the teacher's method. record the temperature of the water in the flask add a known mass of calcium carbide and replace the bung in the flask record the time taken to collect 100 cm3 of gas in the syringe The teacher repeats the experiment using the same volume of water and the same mass of calcium carbide, but with the water at different temperatures. The table shows the results for six different temperatures. Temperature of the water in oC 21 32 40 49 56 60 Time to collect 100cm3 of gas in seconds 100 59 38 24 14 10 Plot these results on the grid and draw a curve of best fit. (3) See addendum under Question 3 Figure 3b2 c The teacher plots this graph to show how the rate of reaction varies with temperature. See addendum under Question 3 Figure 3c Her graph shows that the rate of reaction is not directly proportional to temperature. There are two reasons why the rate of reaction increases as the temperature increases. One reason is that the water molecules move more quickly and collide more frequently with calcium carbide particles. Explain the other reason for the increase in the rate of reaction. (3) [9]
OPLAAI SPASIE VIR VRAAG 2 X LAAI JOU PDF PLAN IN DIE GEGEWE SPASIE OP.
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