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thomas (tt9669) - Post-lab 6 Copper Cycle - lyon - (51730) This print-out should have 30 questions. Multiple-choice questions may continue on the...

Can you answer the following questions 2,7,10,11,13,16,18,21,22,30?
thomas (tt9669) – Post-lab 6 Copper Cycle – lyon – (51730) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points IF the percent yield oF the copper was deter- mined to be 85% at the end oF the procedure but there was obvious aluminum contamina- tion in the dried product, it is not necessary to note it in the lab report that the percent yield is high. It does not matter what is in the f- nal product, only the fnal mass is important, even iF there is contamination. 1. ±alse 2. True 002 10.0 points Consider the process in which H 2 SO 3 is con- verted to H 2 SO 4 . The oxidation state oF oxy- gen remains - 2, and the oxidation state oF H remains +1. Select the correct statement. 1. S neither gains nor loses electrons in this reaction. 2. S is reduced and loses electrons. 3. S is oxidized and gains electrons. 4. S is oxidized and loses electrons. 5. S is reduced and gains electrons. 003 10.0 points Consider the metals in the Following reactions. 2 Mg + O 2 2 MgO CuO + H 2 Cu + H 2 O Ag + + Cl - AgCl Which oF the Following is true? 1. Magnesium is reduced; copper and silver are neither oxidized nor reduced. 2. Magnesium is oxidized, copper is reduced, and silver is neither oxidized nor reduced. 3. Magnesium is oxidized; copper and silver are reduced. 4. Magnesium and silver are oxidized; cop- per is reduced. 004 10.0 points The reaction H 2 CN 2 (g) + heat N 2 (g) + CH 2 (g) is an example oF a 1. decomposition reaction. 2. combustion and precipitation reaction. 3. combustion reaction. 4. displacement reaction. 5. combination reaction. 005 10.0 points Which oF the Following is a list oF the Four types oF reactions that occurred during the copper cycle procedure? 1. Precipitation, acid-base, synthesis and decomposition 2. Oxidation-reduction, acid-base, decom- position and synthesis 3. Oxidation-reduction, precipitation, acid- base and decomposition 4. Oxidation-reduction, precipitation, acid- base and synthesis 006 10.0 points Determine the oxidation state oF Sn in SnO - 2 3 given the oxidation number oF O = - 2. 1. +3 2. - 2
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thomas (tt9669) – Post-lab 6 Copper Cycle – lyon – (51730) 2 3. +8 4. +4 5. +6 007 10.0 points Out of the four types of reactions that oc- curred in the copper cycle procedure, which type of reaction produces aqueous CuSO 4 and liquid H 2 O? 1. Acid-base neutralization 2. Oxidation-reduction 3. Synthesis 4. Precipitation 5. Decomposition 008 10.0 points Identify the type of reaction represented by the chemical equation PbCl 2 (aq) + Li 2 SO 4 (aq) 2 LiCl(aq) + PbSO 4 (s) 1. All of the choices are correct. 2. redox 3. single displacement 4. precipitation 009 10.0 points Classify the reaction 2 HgO(s) 2 Hg( ) + O 2 (g) . 1. decomposition 2. water forming 3. synthesis 4. combustion 010 10.0 points Copper is an oxidizing agent in one of the redox reactions and is a reducing agent in the other redox reaction in the copper cycle procedure. 1. True 2. False 011 10.0 points Which of the following substances is the oxi- dizing agent in the last redox reaction copper cycle procedure? 1. Al 2. CuSO 4 3. HCl 4. H 2 SO 4 012 10.0 points Assign oxidation numbers to each atom in NH + 4 . 1. N = +1, H = +1 2. N = - 2, H = +1 3. N = - 3, H = +1 4. N = +3, H = - 1 5. N = - 1, H = +1 013 10.0 points Consider the following half reaction in a redox reaction in the copper cycle. 2 H + + NO - 3 + 1 e - NO 2 + H 2 O Which of the following statements best de- scribes the chemistry of the half-reaction? 1. The nitrate ion is gaining electrons and is
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