P1 2d reactivity series
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reactivity series
Please - potassium Stop - sodium Caling - calcium Me - magnesium A - aluminium Careless - (carbon) Zebra - zinc Inseatd - iron Try - tin Learning - lead How - (hydrogen) Copper - copper Saves - silver Gold - gold
what metals react with water/steam, in the reactivity series?
metals above hydrogen in the reactivity series - metals below hydrogen do not react with water or steam, which is why copper can be used in both hot and cold pipes
what is the reaction for metal and cold water?
metal + cold water -> metal hydroxide + hydrogen
what is the reaction for metal and steam?
metal + steam -> metal oxide + hydrogen
what is displacement?
when something more reactive takes over the less reactive element
what reactants equal the products salt and hydrogen?
metal + acid -> salt + hydrogen
what conditions does iron rust in?
iron can only rust in both water and oxygen salt can speed up rusting
what does oxidation mean in terms of oxygen and electrons?
when something gains oxygen the element has been oxidised (in terms of oxygen) when something loses electrons it has been oxidised (in terms of electrons)
what does reduction mean in terms of oxygen and electrons?
when something loses oxygen it has been reduced (in terms of oxygen) when something gains electrons it has been reduced (in terms of electrons)
what is a redox reaction?
when both reduction and oxidation takes place at the same time
what is rust?
hydrated iron oxide
how do barrier methods work and what are some examples?
it puts a barrier in between the metal and the air and moisture examples are oil, paint, covering with plastic
how does sacrificial protection work?
an element more reactive than iron and lose their electrons in preference to iron.
how does galvanising work?
when iron is coated in a thin layer of zinc, it oxidises in preference to the iron object
how does galvanising work?
when iron is coated in a thin layer of zinc, it oxidises in preference to the iron object stops oxygen and water reaching the metal underneath