eymmcl2003 12345 6789101112 1314151617 eymmcl2003 1 Why does scratched, tin plated iron rust faster than non-plated iron? answer Electrons flow from.

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Presentation transcript:

eymmcl

eymmcl Why does scratched, tin plated iron rust faster than non-plated iron? answer Electrons flow from iron to tin because tin is below iron in the electrochemical series

eymmcl2003 From magnesium to iron answer 2 Magnesium provides iron with sacrificial protection. In which direction do electrons flow?

eymmcl2003 Which metal is used to galvanise iron? answer 3 zzzz iiii nnnn cccc

eymmcl2003 Which metal RUSTS ? answer 4 iron

eymmcl2003 Give an example of how iron can be physically protected. 5 answer Paint, grease, tin-plate, electroplate, galvanising, coat with plastic Paint, grease, tin-plate, electroplate, galvanising, coat with plastic

eymmcl2003 How does a physical barrier protect iron against rusting? Barrier to water and air (oxygen) Barrier to water and air (oxygen) answer 6

eymmcl2003 Which terminal of a battery protects iron from rusting? answer 7negative

eymmcl2003 What name is given to the coating of iron with zinc? galvanising answer 8

eymmcl2003 Chromium plated steel rusts quickly when scratched. Compared to iron is chromium more reactive or less reactive. Less reactive answer 9

eymmcl2003 Why does salt speed up corrosion? Salt is an electrolyte answer 10

eymmcl2003 How does salt and acid rain affect corrosion? Speeds it up answer 11

eymmcl2003 What is the test for Fe 2+ ions? Ferroxyl indicator turns blue answer 12

eymmcl2003 What two conditions are required for rusting to take place? Water and oxygen answer 13

eymmcl2003 What type of reaction takes place when a metal corrodes ? oxidation answer 14

eymmcl2003 What is corrosion? A chemical reaction involving a metal changing from an element to a compound answer 15

eymmcl2003 Which ion is formed when water and oxygen gain electrons? OH - (hydroxide) OH - (hydroxide) answer 16

eymmcl2003 Which iron ion is formed when iron rusts? Fe 2+ Fe 2+ answer 17