Sodium azide is made by reacting dinitrogen monoxide gas with sodium amide (NaNH 2 ) as shown by the equation.
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1 Q1.Some airbags in cars contain sodium azide (NaN 3 ). (a) Sodium azide is made by reacting dinitrogen monoxide gas with sodium amide (NaNH 2 ) as shown by the equation. 2NaNH 2 + N 2 O NaN 3 + NaOH + NH 3 Calculate the mass of sodium amide needed to obtain 550 g of sodium azide, assuming there is a 95.0% yield of sodium azide. Give your answer to 3 significant figures. (5) (b) If a car is involved in a serious collision, the sodium azide decomposes to form sodium and nitrogen as shown in the equation. 2NaN 3 (s) 2Na(s) + 3N 2 (g) The nitrogen produced then inflates the airbag to a volume of m 3 at a pressure of 150 kpa and temperature of 35 C. Calculate the minimum mass of sodium azide that must decompose. (The gas constant R = 8.31 J K 1 mol 1 ) Page 2
2 (6) (c) Sodium azide is toxic. It can be destroyed by reaction with an acidified solution of nitrous acid (HNO 2 ) as shown in the equation. 2NaN 3 + 2HNO 2 + 2HCl 3N 2 + 2NO + 2NaCl + 2H 2 O (i) A 500 cm 3 volume of the nitrous acid solution was used to destroy completely 150 g of the sodium azide. Calculate the concentration, in mol dm 3, of the nitrous acid used. (3) (ii) Nitrous acid decomposes on heating. Balance the following equation for this reaction....hno 2...HNO NO +...H 2 O (d) Sodium azide has a high melting point. Predict the type of bonding in a crystal of sodium azide. Suggest why its melting point is high. Type of bonding... Reason for high melting point... Page 3
3 (3) (e) The azide ion has the formula N 3 (i) The azide ion can be represented as N N N One of these bonds is a co ordinate bond. On the following diagram, draw an arrowhead on one of the bonds to represent the direction of donation of the lone pair in the co ordinate bond. N N N (ii) Give the formula of a molecule that has the same number of electrons as the azide ion. (iii) Which is the correct formula of magnesium azide? Tick ( ) one box. Mg 3 N MgN MgN 6 Mg 3 N 2 (Total 21 marks) Q2.A sample of pure Mg(NO 3) 2 was decomposed by heating as shown in the equation below. Page 4
4 2Mg(NO 3) 2(s) 2MgO(s) + 4NO 2(g) + O 2(g) (a) A g sample of Mg(NO 3) 2 was completely decomposed by heating. Calculate the total volume, in cm 3, of gas produced at 60.0 C and 100 kpa. Give your answer to the appropriate number of significant figures. The gas constant R = 8.31 J K 1 mol 1. Total volume of gas =... cm 3 (5) (b) The mass of MgO obtained in this experiment is slightly less than that expected from the mass of Mg(NO 3) 2 used. Suggest one practical reason for this. (Total 6 marks) Q3.Calamine lotion can contain a mixture of zinc carbonate and zinc oxide in suspension in water. A manufacturer of calamine lotion claims that a sample contains g of zinc carbonate and 5.00 g of zinc oxide made up to 100 cm 3 with distilled water. (a) A chemist wanted to check the manufacturer s claim. The chemist took a 20.0 cm 3 sample of the calamine lotion and added it to an excess of sulfuric acid. The volume of carbon dioxide evolved was measured over time. The chemist s results are shown in the table. Time / s Volume / cm Page 5
5 (i) (ii) Plot a graph of the results in the table on the grid. The volume should be on the y-axis. Draw a best-fit curve through all the points. Estimate the time taken for the reaction to be completed. (3) Page 6
6 Page 7
7 (b) (i) The volume of carbon dioxide in part (a) was measured at 293 K and at a pressure of 100 kpa. Use information from your graph to calculate the maximum amount, in moles, of carbon dioxide evolved from the zinc carbonate in this 20.0 cm 3 sample. The gas constant, R = 8.31 J K 1 mol 1 Show your working. (3) (ii) Use your answer to part (i) to calculate the mass of zinc carbonate in the 20.0 cm 3 sample of calamine lotion. (If you were unable to complete part (i), you may assume that the amount of carbon dioxide evolved was mol. This is not the correct answer.) (2) (iii) Calculate the difference between your answer to part (ii) and the manufacturer s claim that there are g of zinc carbonate in 100 cm 3 of the calamine lotion. Express this difference as a percentage of the manufacturer s claim. (If you were unable to complete part (ii), you may assume that the mass of zinc carbonate in the 20 cm 3 sample of calamine lotion was 2.87 g. This is not the correct answer.) Difference... Page 8
8 Percentage... (2) (c) Draw a diagram of a suitable apparatus needed to perform the experiment outlined in part (a). Include in your diagram a method for collecting and measuring the carbon dioxide. The apparatus should be airtight. (2) (Total 13 marks) Q4.Which of these samples of gas contains the largest number of molecules? The gas constant R = 8.31 J K 1 mol 1. A m 3 at Pa and 300 K B m 3 at Pa and 400 K C dm 3 at Pa and 500 K D dm 3 at Pa and 600 K (Total 1 mark) Page 9
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