Metals And Special Materials

Question 1

Graphemes is a form of what ?

Answer 1

Carbon

Question 2

How are the atoms arranged in graphene

Answer 2

In a hexagonal structure, just one atom thick

Question 3

What special properties does graphene have

Answer 3

It is very strong, a good thermal and electrical conductor and nearly transparent

Question 4

Fullerene molecules have ________ shapes

Answer 4

Hollow

Question 5

What was the first fullerene to be discovered?

Answer 5

Buckminsterfullerene

Question 6

Fullerenes can be used to :

Answer 6

• to deliver drugs in the body
• in lubricants
• as catalysts
  For reinforcing materials e.g. tennis rackets, so that they are strong but still lightweight

Question 7

Polymers consist of very ______ molecules

Answer 7

Large

Question 8

The atoms within the polymer molecules are held together by

Answer 8

Strong covalent bonds

Question 9

Polymers are ______ at room temperature

Answer 9

Solid

Question 10

How is polythene produced

Answer 10

When lots of ethene molecules remain joined together in an addition polymerisation reaction

Question 11

Polymers are

Answer 11

Cheap and strong and is used to make plastic bottles and bags

Question 12

Metallic bonding occurs in :

Answer 12

• metallic elements, such as iron and copper

- alloys, such as stainless steel

Question 13

What is a metallic bond ?

Answer 13

Is the attraction between the positive ions and the delocalised negatively charged electrons

Question 14

The particles in pure elements have a

Answer 14

Regular arrangement

Question 15

What does it mean if the layers in a metal can slide over each other

Answer 15

It means that the metal can be bent and shaped

Question 16

Traditionally, copper is used to makes water pipes be caused:

Answer 16

• it is an unreactive metal, so it does not react with water
• it can be easily shaped

Question 17

Aluminium properties:

Answer 17

• corrosion resistant
• ductile
• malleable
• good conductivity
  low density

Question 18

Copper properties

Answer 18

• ductile
• malleable
• good conductivity

Question 19

Gold

Answer 19

• ductile
• shiny
• good conductivity

Question 20

Most metal objects are made from

Answer 20

Alloys- mixtures that contain a metal and at least one other element

Question 21

Pure metals are too _____ for many uses

Answer 21

Soft

Question 22

This means alloys are usually _______ and _______ than pure metals

Answer 22

Stronger and harder