Reactivity Series

Potassium- rolls on water, pink flame produces hydrogen gas

Sodium- rolls on water, orange flame produces hydrogen gas

Calcium- vigorous reaction produces hydrogan gas (reacts vigorously more than with water)

Lithium- fizzes, effervesence, moves on surface produces hydrogen gas

Copper- does not react

Iron- does not react (very slightly bubbled)

Zinc- does not react (small bubbles produced)

Magnesium- does not react (gas produced)

( Reaction with dilute HCl)

A displacement reaction is where a more reactive metal displaces a less reactive metal from a compound. In other words a metal higher up in the reactivity series will 'push out' a metal lower in the series. 

Most Reactive

Mg

Zn

Fe

Cu 

Least Reactive

A reduction and oxidation ie something has oxidised and something has reduced at the same time

O xidation

I s

L oss of electrons

R eduction

I s

G ain of electrons