Metals And Alloys

Question 1

Transition metals

Answer 1

Metals that form positive ions

Question 2

Properties of transition metals

Answer 2

-hard
-strong
-high melting points
-less reactive than group 1
-form positive ions with a variety of charges
-form coloured compounds

Question 3

Transition metal coloured compound examples

Answer 3

Cu^+ (grey)
Cu^2+ (blue)
Fe^2+ (green)
Fe^3+ (brown)
Cr^3+ (dark green)
Ni^2+ (green)

Question 4

Corrosion

Answer 4

The destruction of materials by chemical reactions with substances in the environment

Question 5

Iron rusting exprements

Answer 5

-water and air (RUSTS)
-boiled water, oil and bung (no rust)
-air (RUSTS)
-air and ahydrous calcium chloride (no rust)
-water and grease coated nail (no rust)

Question 6

Sacrificial protection

Answer 6

By coating with a more reactive metal, it reacts with the water/oxygen instead of the less reactive metal (eg. zinc-galvanising )

Question 7

Alloys

Answer 7

A mixture of a metal and another substance

Question 8

Alloys compared to pure metals

Answer 8

A pure metal is arranged in a giant lattice of positive metal ions held together by a sea of delocalised electrons.
Alloys contain atoms of different sizes, disrupting the regular lattice, making it stronger as the layers can’t easily slide past each other.

Question 9

Examples of alloys

Answer 9

Bronze (copper and tin)
Brass (copper and zinc)