Electrochemistry Quiz

Select the correct oxidation number of the S atom in H₂SO_4.

• +2

• +4

• +6

• -2

Select the correct oxidation number of the S atom in H₂S.

• -2

• +2

• +4

• +6

What happens during reduction?

• electron gaining

• electron losing

• proton gaining

• proton losing

What does electrochemistry deal with?

• The properties of liquids

• The relationship between chemical reactions and electricity

• The study of gases

• The behavior of solids

What does a voltaic/galvanic cell convert?

• Electrical energy to chemical energy

• Chemical energy to electrical energy

• Thermal energy to electrical energy

• Mechanical energy to chemical energy

What is an electrode?

• For example, a battery or a lightbulb

• It contains substances both in oxidized and reduced states

• For example, zinc + zinc-sulfate solution

• For example, Pt + acid containing H⁺ ions + H₂ bubbles

In a Daniel-type voltaic cell, what is the cathode and the anode? (in this order)

• Sodium and copper

• Copper and zinc

• sodium and chlorine

• Zinc and copper

Select the absolute physical signals.

• mass

• electric current

• voltage

• electric potential

What is the unit of measure for electric potential?

• Ohm (Ω)

• Coulomb (C)

• Ampere (A)

• Volt (V)

What happens to sodium ions during electrolysis of molten NaCl?

• They form sodium gas

• They are reduced at the cathode

• They remain unchanged

• They are oxidized at the anode