Limestone And Metals Flashcards
(35 cards)
What is limestone?
Calcium carbonate
What happens to limestone when heated?
Makes carbon dioxide and calcium oxide
What happens when limestone reacts with acid?
Makes calcium salt, co2 and water
What happens when you add calcium oxide to water?
Calcium hydroxide
What can be used to neutralise acidic soil?
Limestone and calcium oxide
How do you make cement?
Limestone and water
How do you make mortar?
Cement sand and water
How do you make concrete?
Aggregate, cement and sand
What are a bad points about quarrying limestone?
Ugly holes, explosives make noise and dust, destroys habitats
What can limestone make?
Houses roads, dyes
What are good things about using limestone?
Widely available, cheap they don’t rot and can’t be eaten by insect.
What is a metal ore?
A rock which contains enough metal to make it worth extracting
How are metals extracted from ores?
By a chemical reaction
How can electrolysis be used?
To purify the metal
How can a metal ore be extracted from its ore?
Chemically by reduction, oxygen is removed
What happens when the metal needing to be extracted is more reactive than carbon?
Electrolysis
What happens when the metal needing to be extracted is less reactive than carbon?
It can be extracted by reduction using carbon
What is an alloy?
A mixture of two metals
Why is iron turned into an alloy of steel?
Because it is too bendy on its own
What is high carbon steel?
Hard and can make blades for cutting tools
What is low carbon steel?
Easily shaped and used for car bodies
Why are alloys harder?
Because smaller atoms slot into sections between the big atoms which make it harder for them to slide over each other.
What makes bronze?
Copper and tin
What are some properties of a metal?
Maliable
Conductors of heat and electricity
