Describe the role of(i) NaCN in the extraction of gold from gold ore.(it) SiO2 in the extraction of copper from copper matte.(iii) Iodine in the refining of zirconium. Write chemical equations for the involved reactions.
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Describe the role of
(i) NaCN in the extraction of gold from gold ore.
(it) SiO2 in the extraction of copper from copper matte.
(iii) Iodine in the refining of zirconium. Write chemical equations for the involved reactions.
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- Describe the role of (i) NaCN in the extraction of gold from gold ore. (ii) Si02 in the extraction of copper from copper matte. (iii) Iodine in the refining of zirconium. Write chemical equations for the involved reactions.(i) Indicate the principle behind the method used for the refining of zinc.(ii) What is the role of silica in the extraction of copper?(iii) Which form of the iron is the purest form of commercial iron?(1) Diamond and graphite are two minerals with identical chemical compositions, pure carbon (C). Diamond is the hardest of all minerals, and graphite is one of the softest. If their compositions are identical, why do they have such profound differences in physical properties? (2) silicon and oxygen together make up nearly 75 percent by weight of the Earth's crust. But silicate minerals make up more than 95 percent of the crust. Explain the apparent discrepancy. (3) If you were given a crystal of diamond and another of quartz, how would you tell which is diamond? (4) Would you expect minerais found on the Moon, Mars, or Venus to be different from those of the Earth's crust? Explain your answer. (5) Quartz is Si02. Why does no mineral exist with the composition Si03?
- (i) Indicate the principle behind the method used for the refining of Nickel. (ii) What is the role of dilute NaCN in the extraction of gold? (iii) What is ‘copper matte’?An impurity sometimes found in Ca₃(PO₄)₂ is Fe₂O₃, whichis removed during the production of phosphorus as ferrophos-phorus(Fe₂P). (a) Why is this impurity troubling from an eco-nomic standpoint? (b) If 50. metric tons of crude Ca₃(PO₄)₂ contains 2.0% Fe₂O₃ by mass and the overall yield of phospho-rus is 90.%, how many metric tons of P₄ can be isolated?Silicon carbide (SiC) is made by the high-temperature reaction of silica sand (quartz) with coke; the byproduct is carbon monoxide.(a) Write a balanced chemical equation for this reaction.(b) Calculate the standard enthalpy change per mole of SiC produced.(c) Predict (qualitatively) the following physical properties of silicon carbide: conductivity, melting point, and hardness.
- (b) Write chemical equations for the following processes:(iv) Reduction of VO2+ to produce VO2+(v) Neutralization of sulfuric acid by barium hydroxide(vi) Thermal decomposition of 1 mol of sodium bicarbonate to produce sodium carbonate,carbon dioxide and waterWhat is the colour of FeSO4.7H2O crystals? How does this colour change upon heating? Give balanced chemical equation for the changes.The titanium chloride then reacts with liquid magnesium at 900°C to givetitanium and magnesium chloride (MgCl2). Write a balanced chemicalequation for this step in the refining of titanium.
- (i) Name the method of refining of metals such as Germanium.(ii) In the extraction of Al, impure Al2O3 is dissolved in cone. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?(iii) What is the role of coke in the extraction of iron from its oxides?The molecular weight of sperm whale myoglobin is 17.8 kDa.17.8 kDa. The myoglobin content of sperm whale muscle is about 80 g · kg−1.80 g · kg−1. In contrast, the myoglobin content of some human muscles is about 8 g · kg−1.8 g · kg−1. Compare the amounts of O2O2 bound to myoglobin in human muscle and in sperm whale muscle. Assume that the myoglobin is saturated with O2,O2, and that the molecular weights of human and sperm whale myoglobin are the same. How much O2O2 is bound to myoglobin in human muscle? How much O2O2 is bound to myoglobin in whale muscle? The amount of oxygen dissolved in tissue water at 37°C37°C is about 3.5×10−5 M.3.5×10−5 M. What is the ratio of myoglobin‑bound oxygen to dissolved oxygen in the tissue water of sperm whale muscle?(a) Two unlabelled bottles are suspected to contain beryllium and magnesium. (i) Suggest a simple test to differentiate the metals present in the unlabelled bottles. (ii) State the observation obtained and write a balanced chemical equation for the reaction that takes place.