Short Answer TypePressure is determined as force per unit area of the surface. The SI unit of pressure, pascal is as shown below:
1 Pa = 1N m–2
If mass of air at sea level is 1034 g cm–2, calculate the pressure in pascal.
Express each of the following in SI units:
93 million miles (this is the distance between the earth and the sun)
Express each of the following in SI units:
5 feet 2 inches (the average height of an Indian female).
Long Answer TypeDefine matter. Briefly describe the physical classification (three different stages) of matter.
Describe briefly the chemical classification of matter.
Or
Define the terms element, compound and mixture.
Give the points of difference between mixture and compound.
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Mixture 1. The components of a mixture may be present in any ratio. |
Compound 1. The components of a compound are always present in a fixed ratio by mass. |
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2. Mixture may be homogeneous or heterogeneous in nature. |
2. Compounds are always homogeneous. |
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3. The components of a mixture can be easily separated by simple physical or chemical means. |
3. The constituents (elements) of the compound cannot be separated either by physical or mechanical means. They can, however, be separated using heat or light (chemical means). |
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4. Components of the mixture can be easily seen with naked eye or with magnifying glass. |
4. Components of the compound can in no case be seen with naked eye or with a magnified lense. |
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5. The properties of a mixture are midway between those of its constituents. |
5. The properties of a compound are entirely different from those of its constituents. |
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