Quiz 5: Combined - Electrolysis 2

What happens to ionic compounds when they are molten or dissolved in water?

• They cannot conduct electricity.

• They remain in a lattice structure.

• They can conduct electricity.

• They form a solid.

What is the result of melting NaCl?

• NaCl remains in a lattice structure.

• NaCl dissolves in water.

• NaCl breaks into Na+ and Cl- ions.

• NaCl forms a solid.

What happens to the lattice structure of ionic compounds when they are molten or dissolved in water?

• It remains intact.

• It breaks.

• It becomes stronger.

• It forms a gas.

What is the charge of the cathode in an electrolytic cell?

• A) Positive

• B) Negative

• C) Neutral

• D) Variable

What is formed when a halide ion loses electrons at the anode?

• A metal

• A halogen

• An acid

• A base

What happens to OH- ions if no halide is present at the anode?

• They are reduced to form water

• They are oxidized to form oxygen gas

• They are neutralized to form salt

• They are precipitated to form a solid

What is the product at the anode when copper sulphate solution is electrolyzed?

• Chlorine

• Bromine

• Oxygen gas

• Hydrogen gas

What happens to hydrogen ions at the cathode during electrolysis?

• They gain electrons

• They lose electrons

• They remain unchanged

• They form hydrogen gas

Which of the following is a correct statement about copper extraction?

• Copper is extracted by heating with oxygen

• Copper is purified by electrolysis

• Copper is extracted by filtration

• Copper is purified by reduction

What happens to the atoms of impurities during the extraction process?

• They are transported to the cathode

• They remain in the sludge

• They dissolve in the solution

• They are converted to pure copper