Question

State whether'true' or 'false'.
1. Coating a layer of zinc over iron is galvanization.
2. Souring of milk is a physical change.
3. Marine water expedites the rusting of iron in ships.
4. Burning of a wax candle is a physical change.
5. Iron nail gets coated with copper when placed in a solution of copper sulphate.​

Answer 1

1. True

2. False

3. False

4. True

5. True

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Answer 2

Answer:

1) True

2) False

3) True

4) True

5) True

MORE TO KNOW -

I) Galvination prevents rusting thatswhy iron articles are coated with other metal especially zinc and this is called galvination.

ii) Souring of milk is a chemical change as we did not get the original substance back . the nature, odour, taste and identity of milk changes . so it is a chemical chang.

iii) Marine water contains oxygen , moisture and salt when it comes in contact with iron it reacts with it and get rust.

iv) Burning of wax cand it is a physical change as it is reviersible and we the original substance does losses its nature.

v) Iron nail gets coated with copper because iron is more reactive than copper and displaces it from its salt solution.

Fe + Cuso4 ----- Feso4 + cu.