When an iron object rusts, its mass increases. When a match burns, its mass decreases. Do

When an iron object rusts, its mass increases. When a match burns, its mass decreases. Do these observations violate the law of conservation of mass? Explain.

Expert Solution

The observations cited do not necessarily violate the law of conservation of mass. The oxide formed when iron rusts is a solid and remains with the solid iron, increasing the mass of the solid by an amount equal to the mass of the oxygen that has combined. The oxide formed when a match burns is a gas and will not remain with the solid product (the ash); the mass of the ash thus is less than that of the match. We would have to collect all reactants and all products and weigh them to determine if the law of conservation of mass is obeyed or violated.

Observations don't always breach mass conservation. Iron rust's oxide stays, matching mass. Match ash lacks burned gas, seeming less. Overall weigh-in needed for assessment.

Junaid answered 8 months ago

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