Reactivity Series And Extraction Of Metals Flashcards
1
Q
What is reduction?
A
The loss of oxygen
2
Q
Why do most metals form metal oxides?
A
Most metals are reactive and are exposed to oxygen in the air
3
Q
What is the most common iron oxide form?
A
Fe2O3
4
Q
What determines the reactivity of a metal?
A
How easily it forms a positive iron
5
Q
What happens when water reacts with metal? Which metals can react with water?
A
- metal + water = metal hydroxide + hydrogen
- any metal more reactive than magnesium
6
Q
How can you compare the reactivity of a reaction between an acid and a metal?
A
- difference in temperature
7
Q
How do you ensure comparing the reactions of acids and metals are a fair test?
A
- same mass of metal
- same surface area of metal
- same type and concentration of acid
8
Q
What is the easiest way to reduce metal oxide? What is the limitation?
A
- carbon
- carbon takes oxygen from metal to form carbon dioxide
- only works if metals less reactive than carbon
9
Q
How does bioleaching extract low grade metal ores?
A
- bacteria injests something with metal ore
- bacteria produces a leachate solution that contains the metal compound
10
Q
How do the phytomined or bioleached metal compounds become metals?
A
- electrolysis
