Please enable JavaScript.
Coggle requires JavaScript to display documents.
13.5 Making use of the reactivity series - Coggle Diagram
13.5 Making use of the reactivity series
thermite process
repair rail & tram lines
aluminium + iron (III) oxide
reduce to molten iron (runs into cracks & gaps in rail & hardens)
refer textbook
2.simple cell
consist 2 different metals in an electrolyte
electron flow from the more reactive(negative pole) to least reactive (positive pole)
example (in textbook)
voltmeter : measure voltage that makes electron flow
further apart metals : higher voltage
sacrificial protection of iron
iron + oxygen + water---> iron (III) oxide [rust]
zinc oxidised instead iron: sacrificial protection
example in textbook
4.Galvanising
iron / steel coated with zinc
electrolysis (car bodies)
dip roof in molten zinc
keep air & moisture away
damaged , zinc act as sacrificial protection
aluminium + oxygen ---> aluminium oxide (barrier to further corrosion)