Electrolytic Cells

What is the minimum voltage required from a power source to drive the electrolysis reaction described?

• 9 volts

• 3 volts

• 0.83 volts

• 1.5 volts

What are the two types of electrolysis mentioned in the lesson?

• Organic and Inorganic

• Binary and Ternary

• Solid and Liquid

• Molten and Aqueous

What is the elemental form produced at the anode during molten electrolysis of NaBr?

• NaBr2

• Br

• Na

• Br2

What makes aqueous electrolysis more complex in predicting products compared to molten electrolysis?

• It only occurs at standard temperature and pressure

• Only binary compounds are involved

• Presence of water introduces additional reactions

• Higher temperatures are required

What is the primary challenge with molten electrolysis in practice?

• It is too quick to control

• It requires low temperatures

• It requires very high temperatures

• It only works with organic compounds

In aqueous electrolysis, what competes with ions for reduction at the cathode?

• Protons

• Electrons

• Water

• Salt

Which element is reduced to its elemental form at the cathode during molten electrolysis of NaBr?

• Oxygen

• Sodium

• Bromine

• Chlorine

In an electrolytic cell, the positive electrode is the

• anode, where oxidation occurs

• anode where reduction occurs

• cathode where oxidation occurs

• cathode where reduction occurs

Answer explanation

Object is electroplated with chromium using chromium(III) nitrate. Which statement is correct?

• Positive electrode increases in mass

• Concentration of Cr³⁺ ions in solution decreases

• Reduction occurs at positive electrode

• Reaction at negative electrode is Cr³⁺ + 3e^– → Cr

Answer explanation

Reduction of Cr³⁺ ion occurs at the negative electrode (cathode).

Tags

NGSS.HS-PS1-2

Selected species produced at positive/negative electrodes during electrolysis of molten NaCI?

• A

• B

• C

• D

Answer explanation