Chem 3.1

Question 1

Iron ( 3, same explanations )

Answer 1

Building materials, ship buildings, drain covers
Strong and hard, cheap, malleable

Question 2

Copper ( 3, different explanations )

Answer 2

1. Electricity cables ( good conductor of electricity, corrosion résistent, ductile and malleable )
2. water pipes ( non - toxic, corrosion resistant, strong )
3. cooking utensils ( good conductor of heat, corrosion resistant, non - toxic )

Question 3

Aluminium ( 3, different explanations )

Answer 3

1. Overhead power cables ( low density, strong, good electrical conductor )
2. Aircraft body ( low density, strong, corrosion resistant )
3. Window frames, soft drink cans, saucepans ( low density, strong, corrosion resistant, malleable, non - toxic )

Question 4

Zinc ( 2, same reason )

Answer 4

1. Protective coating on iron
2. Electrodes in dry cells
   ( corrode slowly -> stop iron from rusting, malleable )

Question 5

Tin ( 1 )

Answer 5

Tin plating
( non - toxic, corrosion resistant )

Question 6

Magnesium ( 2, different )

Answer 6

1. Firework, flashbulb ( mg gives bright white light on burning )
2. Sacrificial protection of iron ( more reactive than iron )

Question 7

Titanium ( 3, same reason )

Answer 7

1. Supersonic aircraft
2. Missiles
3. Joint replacement
   ( very strong, very corrosion resistant, withstand intense cold and heat without the loss of strength )

Question 8

Tungsten ( W )
1

Answer 8

Light bulb filaments
( glows at high temperature, high melting point )

Question 9

Mercury 1

Answer 9

Thermometer
Liquid at room temperature, expands on heating

Question 10

Silver 2

Answer 10

1. Jewelry decoration ( shiny, precious )
2. Electronic components ( high electrical conductivity )

Question 11

Gold 2

Answer 11

1. Jewelry decoration ( shiny golden yellow, precious, malleable )
2. Protective coating ( reflects heat and light )