Removing Substances Flashcards
Test for chlorine
Damp blue litmus paper ,turn red then bleached
How is HCL formed
Reacting hydrogen and chlorine to form hydrogen chloride
Dissolve in water
Compound that can be decomposed by electrolysis
Electrolyte
Most common dissolved substance in sea water
Sodium chloride(common salt)
Uses of chlorine
Kill MO’s in water
Manufacture of bleach and other cleaning products
Manufacture of plastics such as PVC
Potential problems of chlorine gas
Could leak as a large amount is used
Poisonous could cause injury or death
Products of electrolysis of dilute HCL
Hydrogen gas chlorine gas
Products of electrolysis of sea water
Hydrogen oxygen and chlorine
Hydrogen uses
Rocket fuel
Hydrogen fuel cells
Metals found naturally in earths crust and why
platinum gold silver,very un reactive
Metals whose ore is heated with carbon to extract(reduction)
Copper,lead,tin,iron,zinc
Metals extracted by electrolysis
Aluminium magnesium calcium sodium potassium
When metals corrode they are
Oxidised
Rusting
Oxidation if iron (sometimes with water) to form iron oxide on surface
Why doesn’t gold corrode
It’s very un reactive
Why doesn’t aluminium corrode much
The surface corrodes quickly forming aluminium oxide as a protective layer
How are iron and steel separated from other metals for recycling
Magnets
Properties of metals
Ductile ,malleable ,conduct
Aluminium properties and uses
Low density, doesn’t corrode due to layer
Aeroplanes
Copper properties and uses
Extremely good conductor and doesn’t react with water
Used in water pipes and electrical cables
Gold properties and uses
Unreactive, attractive doesn’t corrode very conductive
Jewellery and in small amounts on oritned circuit boards
Iron main uses and properties
Easily extracted , too soft to be used normally , magnetic
So mixed with carbon and other metals to make steel
Buildings cars machinery
Nitinol
Alloy of nickel and titanium smart material
When heated returns to original shape
Used for flexible glasses frames
Used to hold arteries open
