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1

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

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From magnesium to iron

answer

2

Magnesium provides iron with Magnesium provides iron with sacrificial protectionsacrificial protection. In which . In which direction do electrons flow?direction do electrons flow?

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Which metal is used toWhich metal is used to galvanisegalvanise iron?iron?

answer

3

zinczinc

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Which metal RUSTSWhich metal RUSTS??

answer

4

iron

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Give an example of how Give an example of how iron can be physically iron can be physically

protected.protected.

5

answer

Paint, grease, tin-Paint, grease, tin-plate, electroplate, plate, electroplate,

galvanising, coat with galvanising, coat with plasticplastic

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How does a How does a physical barrierphysical barrier protect iron against rusting?protect iron against rusting?

Barrier to water and air Barrier to water and air (oxygen)(oxygen)

answer

6

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WhichWhich terminalterminal of a of a battery protects iron battery protects iron

from rusting?from rusting?answer

7

negativnegativee

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What name is given to theWhat name is given to the coating of iron withcoating of iron with zinczinc??

galvanisgalvanisinging

answer

8

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Chromium plated steel rusts Chromium plated steel rusts quicklyquickly when scratched. when scratched.

Compared to iron is Compared to iron is chromium more reactive or chromium more reactive or

less reactiveless reactive..

Less reactive

answer

9

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Why does salt Why does salt speedspeed up corrosion?up corrosion?

Salt is an electrolyte

answer

10

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How does How does salt salt and and acid acid rainrain affect corrosion? affect corrosion?

Speeds it up

answer

11

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What is the test for What is the test for FeFe2+2+ ions? ions?

Ferroxyl indicatorFerroxyl indicatorturns blueturns blue

answer

12

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What What twotwo conditions are conditions are required required

for rusting to take place?for rusting to take place?

Water and oxygen

answer

13

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What type of reaction takes What type of reaction takes place when a metalplace when a metal

corrodescorrodes??

oxidation

answer

14

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What is corrosion?What is corrosion?

A chemical reaction involving a metal changing from an

element to a compound

answer

15

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WhichWhich ionion is formed when is formed when water water

and oxygen gain electrons? and oxygen gain electrons?

OHOH-- (hydroxi(hydroxi

de)de)

answer

16

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Which ironWhich iron ion ion is is formed formed

when iron rusts?when iron rusts?

FeFe2+2+

answer

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