Write a balanced chemical equation for each reaction in The Copper Cycle. In eac

Question

Write a balanced chemical equation for each reaction in The Copper Cycle. In each case, one of your reactants is the copper-containing compound from the previous step. Step b is done for you Step (b) 4 HNO_3 (aq) + CU_(S) rightarrow Cu(N0_3)_2 (aq) + 2 H_2O_(I) + 2 NO_2(g) Step (c) Addition of sodium hydroxide Step (d) Decomposition Step(f) Addition of hydrochloric acid Step (i) involved two simultaneous reactions with the zinc: Zinc + copper compound Zinc + excess sulfuric acid from step (f) What is the identity of the noxious brown gas formed in step (b)? ________ What is the name of the copper compound produced in step (c)? ________ What is the identity of the bubbles observed in step (i)? ______ Which reaction steps are double displacements? Which steps are redox reactions? In each case, was the copper oxidized or reduced?

Explanation / Answer

Ans:

1. turns starch-KI paper buish-black due to oxidation of Iodide ion (I-) to molecular iodine (I2).

2. Copper II hydroxide

3. evolution of H2 gas is detected a squeaky pop when lit in air to form water. It act as an explosive when in large quantity.

4. step C

5. step b = Cu(0) to Cu(II) is oxidized; step i (a) Cu(II) to Cu(0) it is reduced and (b) Zn(0) to Zn(II) is oxidized.

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