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प्रश्न
Give two reasons for supposing that water is a compound and not a mixture.
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उत्तर
Water is a compound because:
- Water cannot be split into its constituents, hydrogen and oxygen, by physical methods.
- It can only be separated into its constituents by chemical processes.
- The properties of water are entirely different from those of its constituents.
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संबंधित प्रश्न
Define a mixture. Give two points of evidence to show that sugar solution is a mixture.
State the main points of difference between homogeneous and heterogeneous mixtures.
Classify the following materials as homogeneous mixtures and heterogeneous mixtures :
Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.
Which method can be used to separate a mixture of naphthalene and common salt ?
Select homogeneous and heterogeneous mixtures from the following:
The salt solution, petrol, and water, sand, and charcoal, alcohol and water, air dissolved in water, air, seawater, fruit juices, mist, brass.
Give two examples of the following type of mixture.
gas-gas
Why do we need pure substances?
Write “true” or “false” for the following statement
A pure substance consists of only one kind of atom or molecule.
State whether the following statement is true or false. If false write – the correct statement.
Components in a mixture are present in a definite proportion.
A few drops of ‘Dettol’ when added to water the mixture turns turbid. Why?
