EL Y9 Metals + Crude oil revision

Galvanising is a form of...

• Sacrificial protection

  only

• Barrier protection

  only

• Sacrificial protection and barrier protection

• Neither

Aluminium is extracted by

• Electrolysis because it is higher than carbon on the reactivity series

• Electrolysis because it is lower than carbon on the reactivity series

• Reduction with carbon because it is higher than carbon on the reactivity series

• Reduction with carbon because it is lower than carbon on the reactivity series

Complete the equation: Lithium + water --> ?

• Hydrogen + Lithium Hydroxide

• Hydrogen + Lithium Oxide

• Oxygen + Lithium Hydroxide

• Oxygen + Lithium Oxide

Why might methods such as phytomining and bioleaching be increasingly used in the future?

• Because it is not economically viable to extract the metals from low-grade ores via traditional methods

• Because due to the scarcity of metals, it has become economically viable to extract even small amounts from low-grade ores

• Because it reduces the need to obtain new ore by mining

• Because it conserves limited supplies of more valuable ores with higher metal content

In electroplating, the object to be plated is made the:

• Cathode (negative electrode) as it provides electrons to reduce metal ions, forming a layer of metal atoms on the outside

• Cathode (negative electrode) as it removes electrons from metal atoms, forming a layer of ions on the outside

• Anode (positive electrode) as it provides electrons to reduce metal ions, forming a layer of metal atoms on the outside

• Anode (positive electrode) as it removes electrons from metal atoms, forming a layer of ions on the outside

Sort the 3 metals in terms of their reactivity, highest --> lowest

• Magnesium > Potassium > Iron
• Iron > Potassium > Magnesium
• Iron > Magnesium > Potassium
• Potassium > Magnesium > Iron

In a blast furnace, iron (iii) oxide is fed in and reacts with carbon monoxide or carbon.

Which statement is correct?

• Each Fe ion is reduced, gaining 3e- to become an iron atom.

• Each Fe ion is oxidised, losing 3e- to become an iron atom.

• Each Fe ion is reduced, losing 3e- to become an iron atom?

• Each Fe ion is oxidised, gaining 3e- to become an iron atom.

The difference in temperature in a fractionating column from bottom to top is called a:

• Fractionating column

• Temperature gradient

• Temperature difference

• Fractionating difference

Under what conditions can nitrogen react with oxygen in the air to form nitrous oxides, NOx?

• High temperatures, such as those found in combustion processes.
• Low temperatures, such as those found in refrigeration systems.
• Normal atmospheric conditions.
• In the absence of oxygen.

Which statements are true about a homologous series?

Select all that apply.

• Same general formula

• A trend in physical properties

• Similar chemical / reactive properties

• Successive members differ by CH2