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practiceexam24 - City College Chemistry Department...

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1 City College, Chemistry Department Chemistry 10301, sections T, T2, Τ 3. Prof. T. Lazaridis Final exam, Dec 20, 2007 Name (last name first): _____________________________________________ I.D. Number last 4 :_________________________________________________ Note: There are 18 questions in this exam. Fill in your answer in the blank space provided immediately following each question. 1/2 point will be subtracted every time you report a numerical result with an incorrect number of significant figures. A Data Sheet with useful information is at the end. 1. (4) Write the names of the elements below next to their atomic symbols: Ar Argon Al Aluminum S Sulfur Cu Copper 2. (4) Write the molecular formula next to the names of the following compounds: Sodium Nitrate NaNO 3 Barium Carbonate BaCO 3 Magnesium Sulfate MgSO 4 Potassium Hydroxide KOH 3. (8) Balance the following chemical equations: H 2 + I 2 2 HI 2 As + 3 H 2 2 AsH 3 2 KClO 3 2 KCl + 3 O 2 2 K + 2 H 2 O 2 KOH + H 2
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2 4. (7) The equation for preparing chlorine gas from HCl is 4 HCl (g) + O 2 (g) 2 Cl 2 (g) + 2 H 2 O (g) How many kilograms of HCl are required to produce 1750 kilograms of Cl 2 ? Molar masses: Cl 2 : 70.90 g/mol HCl: 36.46 g/mol 1750 Kg X 1000g/Kg X (1/70.90 g/mol) X (4 mol HCl/ 2 mol Cl 2 ) X 36.46 g/mol X (1 Kg/1000 g) = 1800 Kg HCl 5. (7) Chlorobenzene is prepared from benzene by the following reaction: C 6 H 6 (l) + Cl 2
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