10.1. Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds
A subsection of Chemistry, 9701, through 10. Group 2
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Iron pyrite, FeS2, has a yellow colour that makes it look like gold metal. The compound contains the ions Fe2+ and S2 2–. Give the full electronic configuration of Fe2+. 1s2 Calculate the oxidation number of sulfur in the S2 2– ion. Assume that each sulfur atom in the ion has the same oxidation number.  oxidation number of sulfur in the S2 2– ion = Describe the metallic bonding in gold. Iron pyrite is often called fool’s gold because of its appearance. Impure samples of iron pyrite often contain a small amount of gold. The gold can be obtained from impure iron pyrite. The impure iron pyrite is roasted in oxygen, to produce iron(oxide and sulfurdioxide. Gold does not react with oxygen. The sulfurdioxide produced during roasting would cause environmental consequences if released into the atmosphere. State and explain one of these environmental consequences. Complete the equation to show the roasting of iron pyrite in oxygen. 4FeS2 + 2Fe2O3 +  A sample of impure iron pyrite was roasted in oxygen. The composition of the mixture of solid products is shown. solid product mass / g Fe2O3 33.18 Au 0.37 Calculate the mass of FeS2 present in the sample of impure iron pyrite. Assume that all the FeS2 was converted to Fe2O3 during the roasting process. (Mr: FeS2, 120.0; Fe2O3, 159.6)  mass of FeS2 = g Use your answer to to calculate the percentage by mass of gold in this sample of impure iron pyrite. Assume that gold is the only impurity in this sample of impure ironpyrite. Give your answer to two significant figures. (If you were unable to calculate an answer to , use 55.00 g as the mass of FeS2 in this calculation. This is not the correct answer.)  percentage by mass of gold = % 
9701_w18_qp_21
THEORY
2018
Paper 2, Variant 1
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Iron pyrite, FeS2, has a yellow colour that makes it look like gold metal. The compound contains the ions Fe2+ and S2 2–. Give the full electronic configuration of Fe2+. 1s2 Calculate the oxidation number of sulfur in the S2 2– ion. Assume that each sulfur atom in the ion has the same oxidation number.  oxidation number of sulfur in the S2 2– ion = Describe the metallic bonding in gold. Iron pyrite is often called fool’s gold because of its appearance. Impure samples of iron pyrite often contain a small amount of gold. The gold can be obtained from impure iron pyrite. The impure iron pyrite is roasted in oxygen, to produce iron(oxide and sulfurdioxide. Gold does not react with oxygen. The sulfurdioxide produced during roasting would cause environmental consequences if released into the atmosphere. State and explain one of these environmental consequences. Complete the equation to show the roasting of iron pyrite in oxygen. 4FeS2 + 2Fe2O3 +  A sample of impure iron pyrite was roasted in oxygen. The composition of the mixture of solid products is shown. solid product mass / g Fe2O3 33.18 Au 0.37 Calculate the mass of FeS2 present in the sample of impure iron pyrite. Assume that all the FeS2 was converted to Fe2O3 during the roasting process. (Mr: FeS2, 120.0; Fe2O3, 159.6)  mass of FeS2 = g Use your answer to to calculate the percentage by mass of gold in this sample of impure iron pyrite. Assume that gold is the only impurity in this sample of impure ironpyrite. Give your answer to two significant figures. (If you were unable to calculate an answer to , use 55.00 g as the mass of FeS2 in this calculation. This is not the correct answer.)  percentage by mass of gold = % 
9701_w18_qp_23
THEORY
2018
Paper 2, Variant 3
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