Electrolysis of solutions

When NaCl solution is electrolysed what has forms at the anode?

• Hydrogen
• Oxygen
• Chlorine
• Sodium

When molten NaCl is electrolysed what has forms at the cathode?

• Hydrogen

• Oxygen

• Chlorine

• Sodium

When NaCl solution is electrolysed what has forms at the cathode?

• Hydrogen

• Oxygen

• Chlorine

• Sodium

Copper and hydrogen can each be formed by electrolysis.

At which electrodes are these elements formed?

• A

• B

• C

• D

The diagram shows an electrolysis experiment.

During the electrolysis, sodium was formed at electrode P and chlorine at electrode Q.

Which choice correctly identifies P, Q and X?

• P = anode; Q = cathode; X = concentrated solution of sodium chloride in water

• P = anode; Q = cathode; X = molten sodium chloride

• P = cathode; Q = anode; X = concentrated solution of sodium chloride in water

• P = cathode; Q = anode; X = molten sodium chloride

The diagram shows the electrolysis of aqueous sodium chloride.

Which choice correctly identifies P, Q and X?

• P = Hydrogen Q = Oxygen; X = sodium chloride solution

• P = Sodium Q = Chlorine; X = water

• P = Sodium; Q = Oxygen X = hydrochloric acid solution

• P = Hydrogen Q = Chlorine X = sodium hydroxide solution

What is the name given to the solution that is being electrolysed?

• Salt solution
• Electric solution
• Mineral solution
• Electrolyte

Tags

NGSS.HS-PS1-5

Why is electrolysis of aqueous (dissolved) solutions more complicated than molten?

• Water is messy

• Water contributes hydrogen and hydroxide ions to the electrolyte

• It is easier to dissolve some substances in water than to melt them

In an aqueous solution of copper chloride, which substance is produced at the negative electrode

• copper

• chlorine

• oxygen

• ^chloride

Tags

NGSS.HS-PS2-5

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5