Removing Substances

Question 0

Test for chlorine

Answer 0

Damp blue litmus paper ,turn red then bleached

Question 1

How is HCL formed

Answer 1

Reacting hydrogen and chlorine to form hydrogen chloride

Dissolve in water

Question 2

Compound that can be decomposed by electrolysis

Answer 2

Electrolyte

Question 3

Most common dissolved substance in sea water

Answer 3

Sodium chloride(common salt)

Question 4

Uses of chlorine

Answer 4

Kill MO’s in water
Manufacture of bleach and other cleaning products
Manufacture of plastics such as PVC

Question 5

Potential problems of chlorine gas

Answer 5

Could leak as a large amount is used

Poisonous could cause injury or death

Question 6

Products of electrolysis of dilute HCL

Answer 6

Hydrogen gas chlorine gas

Question 7

Products of electrolysis of sea water

Answer 7

Hydrogen oxygen and chlorine

Question 8

Hydrogen uses

Answer 8

Rocket fuel

Hydrogen fuel cells

Question 9

Metals found naturally in earths crust and why

Answer 9

platinum gold silver,very un reactive

Question 10

Metals whose ore is heated with carbon to extract(reduction)

Answer 10

Copper,lead,tin,iron,zinc

Question 11

Metals extracted by electrolysis

Answer 11

Aluminium magnesium calcium sodium potassium

Question 12

When metals corrode they are

Answer 12

Oxidised

Question 13

Rusting

Answer 13

Oxidation if iron (sometimes with water) to form iron oxide on surface

Question 14

Why doesn’t gold corrode

Answer 14

It’s very un reactive

Question 15

Why doesn’t aluminium corrode much

Answer 15

The surface corrodes quickly forming aluminium oxide as a protective layer

Question 16

How are iron and steel separated from other metals for recycling

Answer 16

Magnets

Question 17

Properties of metals

Answer 17

Ductile ,malleable ,conduct

Question 18

Aluminium properties and uses

Answer 18

Low density, doesn’t corrode due to layer

Aeroplanes

Question 19

Copper properties and uses

Answer 19

Extremely good conductor and doesn’t react with water

Used in water pipes and electrical cables

Question 20

Gold properties and uses

Answer 20

Unreactive, attractive doesn’t corrode very conductive

Jewellery and in small amounts on oritned circuit boards

Question 21

Iron main uses and properties

Answer 21

Easily extracted , too soft to be used normally , magnetic
So mixed with carbon and other metals to make steel
Buildings cars machinery

Question 22

Nitinol

Answer 22

Alloy of nickel and titanium smart material
When heated returns to original shape
Used for flexible glasses frames
Used to hold arteries open