topic 2 metals

Question 1

metals are good conductors of …

Answer 1

heat and electricity

Question 2

4 properties of aluminium

Answer 2

• strong
• low density
• good conductor of electricity
• resistant to corrosion

Question 3

what is aluminium used for

Answer 3

cans, cables

Question 4

2 properties of copper

Answer 4

• good conductor of electricity

- resistant to corrosion

Question 5

what is copper used for

Answer 5

water pipes

Question 6

4 properties of gold

Answer 6

• very resistant to corrosion
• very unreactive
• shiny and soft

Question 7

what is gold used for

Answer 7

jewellery

Question 8

2 properties of steel

Answer 8

• very dense

- very strong

Question 9

what is steel used for

Answer 9

bridges, trains

Question 10

how are alloys harder than pure metals

Answer 10

because they have different sized atoms and an irregular structure

Question 11

why are metals malleable

Answer 11

the layers of the atoms can slide over each other

Question 12

what is a metallic bond

Answer 12

the electrostatic attractions in metals

Question 13

how are alloys harder than pure metals

Answer 13

because the different sizes of the atoms distorts the layers, making it more difficult to slide over each other

Question 14

what do metals consist of

Answer 14

a giant structure

Question 15

small covalent molecules have low … (why)

Answer 15

melting and boiling points because they have very week intermolecular forces

Question 16

why are giant covalent molecules solids at room temp

Answer 16

because they have millions of strong covalent bonds

Question 17

why does silicon dioxide have a high melting and boiling point `

Answer 17

because a huge number of covalent bonds must be broken and this takes a lot of energy

Question 18

3 facts about graphite

Answer 18

-soft and slippery
-good conductor of electricity and heat
high melting and boiling points

Question 19

why does graphite have a high melting and boiling point

Answer 19

because it has many strong covalent bonds and takes a lot of energy to break

Question 20

how is graphite slippery

Answer 20

as the layers in graphite can slide over each other

Question 21

how can graphite conduct electricity

Answer 21

because one electron on the outer shell is not in a covalent bond- it has delocalised electrons

Question 22

graphite is not a …

Answer 22

metal

Question 23

what is graphene

Answer 23

a single layer of graphite- it is one atom thick

Question 24

graphene is a good conductor of …

Answer 24

electricity

Question 25

2 properties of graphene

Answer 25

• strong

- good conductor of electricity

Question 26

what are fullerenes

Answer 26

molecules of carbon atoms with hallow shapes

Question 27

what 2 types of rings can fullerenes have

Answer 27

• hexagonal rings or

- rings of 5 or 7 carbon atoms