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Pre-lab Questions for Experiment #6 Chemical Reactions of Copper and Percent 1) Complete and balance the following equations: (a) Cu (s) + HNO3 (aq) ----> (b) Cu(NO3)2 (aq) + NaOH (aq) ----> (c) Cu(OH)2 (s) - Heat -> (d) CuO (s) + H2SO4 (aq) ----> (e) CuSO4 (aq) + Zn (s) ----> (f) CuSO4 (aq) + Al (s) ----> 2) A mixture of CuO and Cu2O with a mass of 10.50 g is reduced to give 8.66 g of pure Cu metal. What are the amounts in grams of CuO and Cu2O in the original mixture? Show all your calculations on a separate sheet of paper. 3) A sample of 1.699 g of an unknown compound containing silver ions (Ag$^+$) is dissolved in water (H2O) and treated with an excess of sodium chloride (NaCl) in acidic condition. If the mass of the silver chloride (AgCl) precipitate formed is 1.434 g, what is the percent by mass of silver (Ag) in the original unknown compound?

          Pre-lab Questions for Experiment #6
Chemical Reactions of Copper and Percent
1) Complete and balance the following equations:
(a) Cu (s) + HNO3 (aq) ---->
(b) Cu(NO3)2 (aq) + NaOH (aq) ---->
(c) Cu(OH)2 (s) - Heat ->
(d) CuO (s) + H2SO4 (aq) ---->
(e) CuSO4 (aq) + Zn (s) ---->
(f) CuSO4 (aq) + Al (s) ---->
2) A mixture of CuO and Cu2O with a mass of 10.50 g is reduced to give 8.66 g of pure Cu metal. What are the
amounts in grams of CuO and Cu2O in the original mixture?
Show all your calculations on a separate sheet of paper.
3) A sample of 1.699 g of an unknown compound containing silver ions (Ag$^+$) is dissolved in water (H2O) and
treated with an excess of sodium chloride (NaCl) in acidic condition. If the mass of the silver chloride (AgCl)
precipitate formed is 1.434 g, what is the percent by mass of silver (Ag) in the original unknown compound?

Pre-lab Questions for Experiment #6
Chemical Reactions of Copper and Percent
1) Complete and balance the following equations:
(a) Cu (s) + HNO3 (aq) —->
(b) Cu(NO3)2 (aq) + NaOH (aq) —->
(c) Cu(OH)2 (s) - Heat ->
(d) CuO (s) + H2SO4 (aq) —->
(e) CuSO4 (aq) + Zn (s) —->
(f) CuSO4 (aq) + Al (s) —->
2) A mixture of CuO and Cu2O with a mass of 10.50 g is reduced to give 8.66 g of pure Cu metal. What are the
amounts in grams of CuO and Cu2O in the original mixture?
Show all your calculations on a separate sheet of paper.
3) A sample of 1.699 g of an unknown compound containing silver ions (Ag^+) is dissolved in water (H2O) and
treated with an excess of sodium chloride (NaCl) in acidic condition. If the mass of the silver chloride (AgCl)
precipitate formed is 1.434 g, what is the percent by mass of silver (Ag) in the original unknown compound?

Added by Kristy L.

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