Question

which of the following is a physical changes? (a) burning of magnesium (b) dissolving of sugar in water (c) formation of a compound from its elements (d) rusting of iron.​

Answer 1

Answer:

b) Dissolving of sugar is a physical change.

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Answer 2

Explanation:

(b) Dissolving of sugar in water is a physical change, because here sugar and water is obtained back from the sugar solution.

In easy words,

1. Chemical change is that change which cannot be reversible. like burning of Mg, when Mg burn it gives MgO but it can not be reversed.
2. Physical change is that change which can be reversible. like melting of wax.

Additional information -

1. Physical change is temporary, But Chemical change is permanent.
2. A Physical change affects only physical properties, But Chemical change affects both physical and chemical properties.
3. In Physical change no new substance is formed, But In chemical change new substance is/are formed.