6.08 Unit Test Review - Chemistry

Of the metals gold, iron, and sodium, which will not give up its electrons to silver (Ag) in a redox reaction?

• Au

• Fe

• Na

• Cd

Which electrochemical cell does the illustration depict?

• Voltaic cell

• Electrolytic cell

• Fuel cell

• Concentration cell

What type of cell is depicted in the illustration?

• Electrolytic cell

• Fuel cell

• Battery

• Solar cell

Which of the following tasks is NOT appropriate for the type of cell shown in the illustration?

• Electroplating

• Splitting water into hydrogen and oxygen

• Powering a light bulb

• Purifying a metal ore

Which reaction would occur at the anode in a voltaic cell?

• K+(aq) + e- → K(s)

• Ca(s) → Ca2+ + 2e-

• Cd2+(aq) + Zn(s) → Zn2+(aq) + Cd(s)

• Cu2+(aq) + 2e- → Cu(s)

Why was it important to polish the copper strips and wire, the coin, and the nail in the electroplating experiment?

• You need to have a clean surface for contact between the solution and the material.

• You need to heat up the surface of each material by friction to get the reaction going.

• It enhances the electrical conductivity of the materials.

• It prevents the formation of unwanted chemical reactions.

Which example is the site of oxidation when the dry cell is operating?

• graphite rod

• cardboard separator

• solid zinc layer

• paste

Which component of the dry cell serves as the site of reduction when the cell is operating?

• Cardboard separator

• Solid zinc layer

• Negative terminal

• Graphite rod

In an electroplating apparatus, where does the reduction reaction occur?

• on the surface of the cathode

• on the surface of the anode

• in the solution

• on the surface of the battery

In the reaction Zn + HgO → ZnO + Hg, which element gets oxidized?

• Hg

• O

• Zn

• HgO