CHM 101 Exam Practice Problems

1. The standard reduction potential of two half cell are: Zn⁺⁺ + 2e^- = Zn ; E^o = -0.76V 2Ag⁺ + 2e^- = 2Ag E^o = +0.80V. The cell voltage for the electrochemical cell formed by connecting two half cell is ;

• +0.04V

• +1.56V

• -2.36V

• -1.50V

Tags

NGSS.HS-PS3-1

Hydrolysis is reverse of...............................

The ∆E^o for the reaction: Fe + Zn⁺⁺ = Zn + Fe⁺⁺ is -0.32. The equilibrium constant for the reaction is

• 1.4x10^-11

• 2.8x10^-11

• 1.5x10^-4

• 1.8x10^-12

Tags

NGSS.HS-PS3-1

If half reaction is multiplied by a positive number, its electrode potential:

• Increases by two times

• Increases by four times

• Remains unchanged

• Becomes half of its initial

In galvanic cell, which statement is not true?

• Oxidation occurs at anode

• Reduction occurs at cathode

• Electrical energy produces the chemical reaction

• Chemical reaction produces the electrical energy

Tags

NGSS.HS-PS3-1

Greater the reduction potential, greater is its tendency to be …………………and can be used as ……..........

In the lead storage battery:

• A reversible reaction can occur to recharge the battery

• Lead is oxidized to create a flow of electrons

• Lead forms the cathode when it is being reduced

• All of the above

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

A concentration cell is constructed by placing identical Zn electrodes in two Zn²⁺ solutions. If the concentrations of the two Zn²⁺ solutions are 0.10 M and 0.00010 M, respectively, what is the potential of the cell?

• + 0.763 V

• + 0.089 V

• + 0.053 V

• + 0.24 V

Tags

NGSS.HS-PS1-5

Given the reaction: Pb(s) + Cu²⁺(aq) → Pb²⁺(aq) + Cu(s). What is the reducing agent?

• Pb²⁺(aq)

• Cu²⁺(aq)

• Pb(s)

• Cu(s)

In an electrolytic cell, the charge on the electrode that gives electrons to the species in solution is _____; the chemical change that occurs at this electrode is called _______.