4. Give one example to show that when substances are mixed, it may result in a chemical or a
physical change depending on the conditions.
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When substances are mixed together, it can result either in a physical change or a chemical change.
Example: If iron and sulphur are mixed, no chemical change occurs. But when the mixture is heated, it glows after some time and a black substance is formed which is different from iron and sulphur. So, heating a mixture of iron and sulphur results in a chemical change.
Similarly, when sugar and water are mixed together, sugar dissolves completely in water. No new substances are formed during the change. The sugar and water can be obtained back from the solution. This is a physical change which can be reversed.
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