Science Revision- unit 3 theme 2 making and improving products

electrolysis

electrolysis is the breakdown of a compound by electricty

electrolysis involves an electrical current passing through a liquid contains freely mooving ions

positive cations are attracted to the negative cathode

negative anions are attracted to the possitive anode

electroplating

electrolysis can be used to plate metals with other metals this is called electroplating

a cathode is plated with metal from the anode( the spoon gets coverd with another metal)

why do we electroplate items

protecting from corrosion (rusting)- chronium is used to coat cars and motorbikes

reduce the effects of allergies-lots of people are allergic to a cheap metal called nickel coating the nickel…