Electrolysis 2

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

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

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

What particle carries the charge in the wire?

• electron

• proton

• ion

• atom

Which substance does NOT produce a gas at both electrodes during electrolysis?

• concentrated aqueous sodium chloride

• concentrated hydrochloric acid

• dilute sulfuric acid

• molten lead(II) bromide

Which metal could not be used for electroplating by using an aqueous solution?

• chromium

• copper

• silver

• sodium