metals

Question 1

where does metallic bonding occur

Answer 1

metals and alloys

Question 2

what do metals have

Answer 2

giant structure - electrons in the outer shell are delocalised
produces are a lattice structure of positive ions held by electrostatic forced

Question 3

what is metallic bonding

Answer 3

attraction between positive ions and delocalised electrons

Question 4

what are the properties of metals

Answer 4

-high melting/boiling point
-delocalised electrons makes them good thermal/electrical conductors
-malleable (layers slide over each other)

Question 5

why is copper a good material for water pipes?

Answer 5

-unreactive metal so doesn’t react with water
-malleable

Question 6

what is an alloy

Answer 6

mixture of a metal and at least 1 element

Question 7

Describe how the structure of an alloy is different to a pure metal

Answer 7

alloys is a mixture of different metals bonded together and has distorted layers therefore they’re harder than pure metals

Question 8

Explain how electricity is conducted in a metal

Answer 8

-giant structures, closely packed
-it has free electrons
-delocalised electrons that carry charge so they’re free to move

Question 9

what is steel

Answer 9

useful alloy made from iron

Question 10

what is a property of pure iron and how it is arranged

Answer 10

malleable because layers can slide over each other easily

Question 11

how can the properties of iron be changed

Answer 11

mixing it with small quantities of carbon or other elements

Question 12

Give 2 useful properties that stainless stell has but pure iron does not have

Answer 12

hard and resistant to corrosion

Question 13

pure gold is soft for many uses
why is pure gold soft?

Answer 13

atoms form layers that can slip over each other

Question 14

gold is used to make components for computers because it is a very good electrical conductor.
whys it a good electrical conductor

Answer 14

has delocalised electrons that can move

Question 15

what is gold mixed with to form an alloy and what does the carat system show

Answer 15

-gold is mixed with silver, copper and zinc to form an alloy
-carat system shows the amount og gold in the alloy
24 carat - 100% gold

Question 16

why is aluminium alloys used to make aeroplanes

Answer 16

combine low density with high strength

Question 17

why is brass used to make water taps and door fitings

Answer 17

hard- wearing and very resistant to corrosion