Metal structures and properties

Question 1

what is a metal made from?

Answer 1

particles held together by metallic bonds

Question 2

give 3 properties of most metals?

Answer 2

are hard
good conductors of electricity
have a high density

Question 3

give an example of a physical property of copper?

Answer 3

its high thermal conductivity

Question 4

what is copper normally used to make?

Answer 4

the base of saucepans

Question 5

give an example of a chemical property of gold?

Answer 5

the resistance to attack by oxygen or acids

Question 6

what are other examples of physical properties of metals?

Answer 6

malleable or ductile

Question 7

why do some metals have high melting points?

Answer 7

because of their strong metallic bonds between particles

Question 8

what is aluminium normally used for?

Answer 8

such as in the aircraft industry and also modern cars

Question 9

what is a metallic bond?

Answer 9

a strong electrostatic force between close-packed posotive metal ions

Question 10

the particles in a solid metal are:

Answer 10

close together

in a regular arrangement

Question 11

what happens to metals at very low temperatures?

Answer 11

some metals become super conductors

Question 12

what can superconductors be used to make?

Answer 12

to levitate magnets and super fast circuits (train tracks)

Question 13

what are superconductors?

Answer 13

materials that conduct electricity with little or no resistance

Question 14

what is the temperature at which superconductivity occurs called?

Answer 14

critical temperature

Question 15

what are the two types of superconductors?

Answer 15

type 1, metals

type 2, alloys

Question 16

what is removed when a substance goes from its normal state to a superconducting state?

Answer 16

its magnetic fields inside it

Question 17

give 3 benefits of superconductors?

Answer 17

loss-free power transmission
super-fast electronic circuits
powerful electromagnets

Question 18

why does a metal conduct electricity?

Answer 18

because de-localised electrons within its structure can move easily

Question 19

give 2 disadvantages of superconductors?

Answer 19

they only work at very low temperatures

superconductors that function at 20 degrees Celsius need to be developed

Question 20

give an example of a physical property of a metal?

Answer 20

the high thermal conductivity of copper

Question 21

give an example of a chemical property of a metal?

Answer 21

the resistance to attack by oxygen or acids shown by gold

Question 22

why do metals have high melting and boiling points?

Answer 22

because they have strong metallic bonds

Question 23

what is a metallic bond?

Answer 23

a strong electrostatic force of attraction between close packed posotive metal ions and a sea of delocalised electrons

Question 24

what are superconductors?

Answer 24

materials that conduct electricity with little or no resistance

Question 25

what happens when a substance goes from its normal state to a superconducting state?

Answer 25

it no longer has a magnetic field inside it

Question 26

what happens if a small magnet is brought near the superconductor?

Answer 26

it is repelled

Question 27

what happens if a small permanent magnet is placed above the superconductor?

Answer 27

it levitates

Question 28

what are the potential benefits of superconductors?

Answer 28

loss free power transmission
super fast electronic circuits
powerful electromagnets