Flashcards in Unit 3 Deck (46):
A metal that is hard?
A metal that is shinny?
A metal that conducts?
A metal that conducts electricity?
A malleable metal?
A ductile metal?
What does malleable mean?
It means it’s mouldable
What does ductile mean?
It’s can be stretched
What is the difference between non-metallic substances and metallic substances?
Metallic substances will conduct electricity.
Where do you get metals?
Metals are found in the ground most are found as ores.
What are ores?
Compounds of metals
What are the three ways a metals can be extracted?
Heating with carbon and electrolysis.
What two metals are found uncombined?
Gold and silver
What are some uses of iron?
Pipes, fencing and tools
What are some uses of steel?
Ships, cars and tin cans.
How is iron extracted?
From a blast furnace.
What are the three main starting materials in a blast furnace?
Iron, coke and limestone.
What is aluminium used for?
Aeroplanes, drink cans and take away boxes.
How is aluminium extracted.
How is copper extracted?
By using heat.
What metal doesn’t react with oxygen?
Why is limestone added to iron ore?
To remove the silica from iron.
Why can’t aluminium be extracted by heat or heating with carbon?
Because it’s too reactive
What three substances can metals be reacted with in order to create an order of reactivity?
Oxygen, water and acid
Why are group one metals not tested in acid?
Because they would be too reactive
How can the reactivity series be used to determine the best metal to be used for a specific purpose?
Depending on what you want the element for and what it’s going to come into contact with you can pick something that will react.
What is a displacement reaction?
A displacement reaction in one in which one metal can push another out of solution.
What is corrosion?
Corrosion is a chemical reaction in which the surface of a metal reacts (normally with oxygen) to form a compound.
What is rusting?
Rusting is the specific name given to the corrosion of iron or steel.
What metals don’t corrode?
Gold & silver
What two substances are needed for iron to rust?
Oxygen and water
What do acid and salt do in the process of corrosion?
They speed it up
What are the two different ways to prevent corrosion?
Physical and chemical protection
What are some examples of physical protection?
Painting, plastic coating and tin (plating)
What are some examples of chemical protection?
Sacrificial protection, galvanising and using a power supply.
What are the advantages of batteries over mains electricity?
Carry them around, wireless and light weight.
What are the disadvantages of batteries compared with mains electricity?
They run out, can be expensive having to replace them.
What is a polymers?
Polymers are large molecules made of many smaller molecules joined together.
What is the difference between a natural and a synthetic polymer?
Natural= found in the environment
Synthetic polymers= are made by man
What are some examples of natural polymers?
Silk, wool and Cotten.
What are some examples of synthetic polymers?
Polystyrene, polyvinyl chloride and polythene
What is the starting material for most synthetic polymers?
What problems are associated with the use of plastics?
Most are non-biodegradable, they will not break down naturally in the environment. They release toxic gases when burned.
What properties do thermoplastic polymers have?
They can be reshaped (mouldable) above a specific temperature.
What are the properties of thermosetting polymers?
Cannot be reshaped on heating (they are moulder into shape during production and cannot be changed).