Some metals, such as aluminium, are extracted from their ores using electrolysis.

Why are some metals extracted using electrolysis?

• They are native metals

• They are more reactive than carbon

• They have low melting points

• They conduct electricity

Which of the following metals can not be extracted from its ore by reduction?

• Iron

• Zinc

• Copper

• Lithium

A student was investigating the reactivity of different metals in hydrochloric acid.

What must the student keep constant in this investigation to make it a fair experiment?

• mass of metal concentration of acid

• volume of acid length of metal

• size of metal temperature of acid

• temperature of the room type of acid

Some metals are unreactive and exist on their own in the earth.

What are these metals known as?

• Transition Metals

• Native metals

• Alkali Metals

• Alkaline earth metals

A reaction took place between iron sulfate and magnesium.

iron(II) sulfate + magnesium → magnesium sulfate + iron

Which species has been oxidised?

• Iron

• Magnesium

• Sulfur

• None of the above

Zinc is extracted from zinc oxide by reduction.

Which element is oxidised during this process?

• Hydrogen

• Oxygen

• Carbon

• Zinc

Copper can be extracted from low grade ores using bioleaching.

A leachate solution is produced.

Which process is used to extract the copper from the leachate solution?

• Distillation

• Cracking

• Displacement

• Fermentation

Oxidation is

• loss of oxygen

• loss of electrons

• gain of hydrogen

• gain of electrons

Reduction is

• loss of electrons, or

• gain of oxygen

• loss of hydrogen

• loss of oxygen

Which of the following half equations is correct?

• Fe²⁺ → Fe + 2e^-

• Mg + 2e^- → Mg²⁺

• Cu²⁺ + 2e^- → Cu