displacement (2)
- Created by: tia5sos
- Created on: 13-10-20 18:17
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- more reactive metals displace less reactive ones
- 1. If you put a more reactive metal into a solution of a less reactive metal salt, the reactive metal will displace the less reactive metal in the salt.
- example: if you put an iron nail in a solution of copper sulfate, the more reactive iron will 'kick out' the less reactive copper from the salt.
- you end up with iron sulfate solution and copper metal.
- 2. if you put a less reactive metal into a solution of a more reactive metal salt, nothing will happen.
- example: if you put a small piece of silver metal into a solution of copper sulfate, nothing will happen. The more reactive metal (copper) is already in the salt.
- 3. you can use displacement reactions to work out where in the reactivity series a metal should go.
- example; a student adds some metals to metal salt solutions and records whether any reactions happen. Use her table of results, to work out an order of reactivity for the metals.
- magnesium displaces both copper and zinc, so it must be more reactive than both.
- copper is displaced by both magnesium and zinc, so it must be less reactive than both.
- zinc can displace copper, but not magnesium, so it must go between them.
- the order of reactivity, from most to least, is: magnesium, zinc, copper.
- example; a student adds some metals to metal salt solutions and records whether any reactions happen. Use her table of results, to work out an order of reactivity for the metals.
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