Question

consider the following chemical changes,

i)When a material made of iron rusts, its mass increases.

ii)when match sick burns, its mass dcreases.

Do you think that these two violete the law of conservation of mass?explain.

Answer 1

no it doesn't because in first case when the mass increases there are oxygen and water which have been on the reactants side and in second case burnt particles in the form of smoke blow away.

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Answer 2

HII THERE IS YOUR ANSWER

THIS CHEMICAL CHANGES ARE NOT VOILET LAW OF CONSERVATION OF MASS BECAUSE WHEN A MATERIAL IS MADE UP OF RUST OF IRON THAN ITS MASS INCREASES DUE TO THE AIR MOLECULE PRESENT BETWEEN THE MOLECULAR GAP OF THE RUST BECAUSE IT CONTAIN WATER MOLECULE IRON CAN ONLY RUST IN THE PRESENCE OF AIR AS WELL AS WATER SO YOU NEED TO CONSIDER THE MASS OF WATER MOLECULE AND AIR PRESENT BETWEEN THE MOLECULAR GAP OF THE RUST
WHEN MATCH STICK BURNS THAN THE PHOSPHORUS PRESENT ON ITS TIP IS CONVERTED INTO GAS WHICH CAN LED TO THE DECREASE IN THE MASS OF THE TIP OF THE STICK BUT IF WE CONSIDER THE MASS OF THE GAS WITH STICK THAN IT ALWAYS REMAIN CONSTANT

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