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State one similarity and one difference between evaporation and boiling.
List four factors which affect the rate of evaporation.
Describe an activity to show that water vapour is present in air.
Distinguish solids, liquids and gases in a tabular form under the following characteristics-
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Read the following information and answer the questions based on information and related studied concepts. Substance – 1. is brittle. Substance – 2. melts at 5 °C and boils at 150 °C. Substance – 3. has high melting point of 800 °C. Substance – 4. has melting point –169 °C and boiling point – 104 °C.
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