Question

1) The solubility of Cu(OH)2 would _____ if one added NaCN to the solution.

A. Increase or B. Decrease

2) AS the temperature increases chemical reactions tend to become more ______ controlled.

A. Entropy or B. There is no temperature effect.

3) A cell where electricity is used to make the reaction run in a nonspontaneous direction is a ______ cell.

A. Avogadro B. Electrolytic or C. Galvanic

4) Alkaline Batteries use this mtal in the anode.

A. Iron B. Nickel C. Zinc

5) In an electrolytic cell:

A. Would be good to plate chromium or nickel on a car bumper.

B. Would be good to use in a pacemaker due to it's long life.

C. Would be good when you need a rechargable energy source.

6) Which solution, formed by mixing, would maintain a fairly constant pH, even when additional small amounts of a strong acid or base are added? 100 mL of 1 mol of both:

A. NH4Cl and NH3 B. NaOH and NH3 C. HCL and NaCl

7) The metal which is actually oxidized/ reduced in a lithium ion battery is:

A. Cobalt B. Manganese C. Zinc

Answer 1

1. Cu(CN)₂ is insoluble in water but rapidly dissolves in solutions containing CN⁻ to form [Cu(CN)₄]²⁻ Kf = 2 x 10²⁷.

Refer http://www2.ucdsb.on.ca/tiss/stretton/database/Complex_Ions_Constants.htm

2. Temperature vs chemical reaction is controlled by entropy. Since endothermic reactions (Heat energy require one) are favored by supplying heat, hence temperature has a control, but for exothermic reactions this is not correct. So entropy control is best term.

3. electrolytic cell or secondary cells are rechargeable cell by definition.

4. In an alkaline battery, the negative electrode is zinc and the positive electrode is manganese dioxide.

Overall reaction:Zn_(s) + 2MnO_2(s) ⇌ ZnO_(s) + Mn₂O_3(s)

Zinc is losing electrons and becomes Zn2+ state means it is anode.

5. electrolytic cell or secondary cells are rechargeable cell by definition.

6. NH4Cl and NH3 combination is called as buffer solution, these solutions resist a drastic change in pH.

7. Manganese is reduced in a lithium ion battery Li-MnO₂

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