Question

answer this question pleaze​

Answer 1

Answer:

1) It has not rusted after such a long period.

2) Iron

3) Physical Change can be reversed.

4) Heat may be given out but not absorbed.

5) Chemical and Physical Changes respectively.

II )

1)Calcium Carbonate (CaCO3)

2) Sodium Hydrogen Carbonate or Sodium Bicarbonate (NaHCO3)

III)

1) Carbon Dioxide (CO2)

2) Melting of Wax

3) Greenish

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