Transition metals

Question 1

What are most metals?

Answer 1

Transition metals (includes iron and other metals used in construction + things like gold etc) They live in the centre of the periodic table

Question 2

Properties of transition metals

Answer 2

High melting points, High densities, they form coloured compounds, they can act as catalysts

Question 3

Exceptions to the rules (Transition metals)

Answer 3

Mercury melts at -39 Degrees

Scandium has a density similar to aluminium so they are relatively lightweight.

Question 4

Corrosion

Answer 4

Metals can oxidise in air eg: sodium - Reacts very quickly and freshly exposed surface soon turns dull as oxide is formed.

Corrosion happens when a metal continues to oxidise. The metal becomes weaker over time and may become metal oxide entirely.

Question 5

Rusting

Answer 5

Rusting occurs when iron or steel reacts with oxygen and water.

Question 6

Preventing corrosion

Answer 6

Keep oxygen or water away from the iron or steel

Electroplating - Cathode is the iron or steel object, the anode is the plating metal, the electrolyte contains ions of the plating material.

Sacrificial protection - If iron is in contact with a more reactive metal, such as zinc, the more reactive material will sacrifice itself and rust whilst the iron does not.

Galvanising - When iron is coated in zinc. Stops O2 and H20 from reaching the iron.

Question 7

Alloy

Answer 7

Mixture of 2 or more elements. Often increases strength and other attributes.