C5 - Chemical changes Flashcards
C5 - What is a displacement reaction
When a more reactive metal takes the place of a less reactive metal in a compound.
E.g. Zinc chloride + sodium Sodium chloride + zinc
Sodium will take the place of zinc because it is more reactive
C5 - What is the definition of an ore
A rock that contains a high enough % of metal atoms to make it viable for commercial exploitation.
C5 - What factors might scientists consider before deciding if it is worth extracting a particular metal from an ore?
How easy it is to extract.
How much metal the ore contains.
Current demands for the particular metal (do we need a lot of it?)
How much can the metal be sold for?
The environmental impacts of extracting the metal
C5 - What is the definition for oxidation?
The chemical addition of oxygen.
The loss of electrons.
I.e. when substances are oxidised they lose electrons.
C5 - What is the definition for reduction?
The chemical removal of oxygen.
The gain of electrons.
I.e. when substances are reduced they gain electrons
C5 - What do a metal and an acid produce?
Metal + acid Salt + Hydrogen
C5 - What does a metal carbonate and an acid produce?
Metal carbonate + acid Salt + Water + carbon Dioxide
C5 - What does a metal oxide and an acid produce?
Metal oxide + acid Salt + Water
C5 - describe a method used to make a salt from an insoluble base and an acid.
1.Measure out some acid and place into a beaker.
2.Stand the beaker on a tripod and gauze and warm gently.
3.Collect some of your insoluble base in a weighing boat.
4.Add half a spatula of the insoluble base into the acid and stir using the glass rod.
5.Keeping the acid warm (but not boiling) continue adding the insoluble base until no more dissolves.
6.Allow to cool and then filter the mixture and discard the residue.
7.Pour the filtrate into an evaporating basin. Heat the solution until the volume is halved.
8.Remove from the heat and leave to crystallise.
