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Displaying 5 out
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questions & answers.
Q1.
Water occurs bath in the free and in the combined state - in solid, liquid or gaseous [vapour] state. Name the following forms of water.
| Name | |
| 1. Water occurring in the combined form in a mineral salt. | |
| 2. A naturally occurring gaseous state of water other than water vapour. | |
| 3. A liquid free state of occurrence of water above the earth's surface. | |
| 4. A food product containing a large percentage of water in the combined form. | |
| 5. An occurrence of water in the free state in the solid form other than ice. | |
| 6. Water occurring in the liquid form in the free state below the earth's surface. |
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- Saline water
- Atmospheric moisture or Humidity
- Surface water
- Cucumber
- Snow or Frost
- Groundwater
Q2.
The above diagram represents the water cycle. Give reasons for the following :
- Nature maintains the water cycle.
- Rain water is considered a very pure form of water compared to river and lake water.
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answer not shownQ3.
With reference to the following three properties of compounds - give reasons why water is considered a compound and not an element.
| Properties of compounds | Water as a compound |
| 1. Always homogenous with particles of one kind. | |
| 2. Have a definite set of properties and components do not retain their original properties. | |
| 3. The components can be separated by chemical means only. |
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answer not shownQ4.
Water found in the natural state is called 'natural water' - while that which has received some form of treatment is called 'treated water'.
Name the following:
| Name | |
| 1. Two sources of natural water other than rain water, river and lake water. | |
| 2. The purest form of treated water free from all minerals solutes prepared by condensing steam. | |
| 3. A form of treated water prepared by filtration followed by chemical treatment and is generally used for drinking purposes. | |
| 4. An acidic gas used for killing germs present in the water in swimming pools. |
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- groundwater and glaciers
- distilled water
- purified or potable water
- chlorine
Q5.
The diagram below represents the - dissolution of sodium chloride in water.
With reference to the diagram -
Match Column I with the meaning of the terms in Column Il.
| Column I | Column II |
| A: Solute 'Y' | 1. The substance which dissolves in the solvent to form a solution. |
| B: Solvent 'X' | 2. A homogenous mixture of a solute in a solvent. |
| C: Solution 'Z' | 3. The liquid or medium of dissolution which allows the solute to dissolve in it to form a solution. |
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