Topic 5 - Separate Chemistry 1
No description yet. This curated deck is ready for daily study.
Card preview (24)
What are the typical properties of transition metals?
Hard, strong and shiny Malleable Conductive High MP/BP High densities
What do transition metals make?
Good catalysts
What must you be able to recall that most metals are transition metals and that their typical properties include?
High melting point High density The formation of coloured compounds Catalytic activity of the metals and their compounds (exemplified by iron)
What are most transition metals visually wise?
Colourful
Name one industrial process that uses a transition metal catalyst and name the catalyst used?
Haber process and iron
Rubidium is a Group 1 metal Palladium is a transition metal Predict which of these two metals will have a higher densitiy
Palladium as it is a transition metal therefore its density will be larger than rubidium
Why are pure metals malleable?
Because they have a regular arrangement of identical ions that can slide over each other
What are alloys?
Metals made up of another element
What can alloys be made of?
Metal + Non-metal or Metal + Metal
How do alloys make stronger compounds?
Because different elements have different sized atoms therefore it will be much harder for the ions to slide over each other
Why is iron often alloyed?
To make it stronger and harder Prevent rust (corrosion)
Why is gold alloyed?
To make it stronger
What are aluminium alloys used in?
Aircraft manufacture
What is steel used for?
Bridges, cutlery, washing machines, pans, ships and tools
Explain why alloys of aluminium are used instead of pure aluminium for building aircraft?
Aluminium is not strong enough on its own for making aeroplanes therefore it is alloyed with small amounts of other metals to increase its strength
What type of a reaction is the rusting of iron?
A redox reaction
What must be in the presence for metals to corrode?
Oxygen and water
Why is rusting a redox reaction?
The metal loses electrons so it is oxidised whilst the oxygen gains electrons therefore the oxygen gets reduced
How do you test rusting?
Test with water but no oxygen, no water but oxygen and both] rusting will only occur in last
When testing for rust how do you remove oxygen?
Oil
When testing for rust how do you remove water?
Add calcium chloride
How can you prevent rusting?
Painting Oiling or greasing Sacrifical protection
When is oil/grease used to prevent rusting?
When moving parts are involved
What is involved in galvanising?
A coat of zinc over iron