Chemical Changes Flashcards
(9 cards)
When does a displacement reaction occur?
A displacement reaction occurs when a more reactive metal displaces a less reactive metal from a compound
E.g: zinc + copper sulphate -> zinc sulphate + copper
What do most metals make when reacting with an acid?
Produce a salt and hydrogen
E.g: zinc + hydrogen chloride -> zinc chloride (salt)+ hydrogen
What do metal carbonates form when reacting with an acid?
-a salt
-carbon dioxide
- water
Calcium carbonate + hydrogen chloride-> calcium chloride (salt) + carbon dioxide + water
Why do group 1 metals produce hydrogen and a metal hydroxide?
They are more reactive so they displace it to produce hydrogen + metal hydroxide
When do we use displacement reactions?
To obtain metals from their ores by displacing with a more reactive, less valuable metal or carbon (cokes)
Where do displacement reactions occur and how ?
In a blast furnace: the iron oxide is reduced (oxygen lost) to produce iron
Show me the word equation representation of ion oxide being reduced to produce iron
Iron oxide (reduced as it’s lost oxygen) -> carbon dioxide + iron
Do we still use oxidisation and reduction if oxygen is not in a reaction
Yes we use it for the loss or gain of electrons in regards to atoms/ions or molecules
What does OIL RIG stand for in regards to electrons?
Oxidation
Is
Loss
Reduction
Is
Gain
