Question

Identify the chemical change



sublimation

melting of wax

rusting of iron

freezing of water

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Answer 1

${\overbrace{\underbrace{\orange{Q}\green{U}\orange{E}\green{S}\orange{T}\green{I}\orange{O}\green{N}}}}$

Identify the chemical change

sublimation

melting of wax

rusting of iron

freezing of water

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$\huge\pink{A}\blue{N}\green{S}\red{W}\purple{E}\orange{R}$

c option

• Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.

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$\bf\purple{\implies\:not\:a\:because}$

The term sublimation refers to a physical change of state and is not used to describe the transformation of a solid to a gas in a chemical reaction. For example, the dissociation on heating of solid ammonium chloride into hydrogen chloride and ammonia is not sublimation but a chemical reaction.

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$\bf\purple{\implies\:not\:b\:because}$

The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.

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$\bf\purple{\implies\:not\:d\:because}$

Freezing is not a chemical reaction, but is a phase (or physical) change. In a chemical reaction, substances combine and react in a way that causes...

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