6. There was some construction work in Rahul's house in the rainy season. A truck filled with cement bags came and labours started unloading the bags on a waterlogged road. Rahul when saw this, immediately stopped the labours and asked them to keep the bags inside the house in a dry place. (a) What is a chemical change? (1) (b) What would have happened to the cement bags iſ kept in waterlogged roads? (1)
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- a.The process where the chemical properties of a substance change are called a chemical change.
- b.Cement reacts with water vigorously. So, when cement bags are kept in waterlogged roads the cement reacts with water and form a hard stone like substance. This hard cement is not useful. This is a chemical change where can't get back the actual cement back.
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