Metals And Plastics

Question 1

Give 3 properties of metals

Answer 1

Lustrous, malleable, ductile

Question 2

What is an alloy?

Answer 2

A mixture of metals

Question 3

What are 4 properties of Alkali Metals?

Answer 3

Lustrous and easy to cut
Good conductors
Low densities - float on water
Low melting points compared to other metals

Question 4

What is produced when alkali metals react with water?

Answer 4

Hydrogen gas is given off and a hydroxide compound is formed

Question 5

Give 3 uses of alkali metals

Answer 5

Lithium batteries
Sodium in street lights
Potassium in fertilisers

Question 6

Give 3 uses of alloys

Answer 6

Brass to make musical instruments
Bronze statues
Steel for construction

Question 7

What is the word equation for the reaction between zinc and hydrochloric acid?

Answer 7

Zinc + Hydrochloric acid ——–> Zinc chloride + hydrogen

Question 8

What is the chemical equation for the reaction between zinc and hydrochloric acid?

Answer 8

Zn + HCl —–> ZnCl2 (l squared) + H2 (squared)

Question 9

How do you test for hydrogen

Answer 9

Place a lighted splint into hydrogen and there should be a squeaky pop

Question 10

Give the reactivity of calcium, magnesium, copper and zinc in order from most to least reactive in water

Answer 10

Calcium - most
Magnesium
Zinc + Copper - Least (none)

Question 11

Give the reactivity of calcium, magnesium, copper and zinc in order from most to least reactive in acid

Answer 11

Calcium - most
Magnesium
Zinc
Copper - Least (none)

Question 12

What is rusting?

Answer 12

The corrosion of iron and steel

Question 13

What are 2 factors required for rusting?

Answer 13

Oxygen and water

Question 14

Give 3 ways of preventing rusting

Answer 14

Painting, oiling/greasing, galvanising

Question 15

Give 5 properties of plastics

Answer 15

Can be moulded 
Easy to maintain
Not very expensive
Not very heavy - low density
Good insulators