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Some Basic Concepts of Chemistry

Long Answer Type

91.
What do you know about the most scientific system of units?

The latest and the most scientific system of units is called International System of Units (S.I. units). This system was adopted by the General Conference of Weights and Measures in October, 1960. This system is now used throughout the world. The SI unit system has seven basic units.

Seven basic SI Units.

Quantity	Unit	Symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Electric current	ampere	A
Thermodynamic,Temperature	kelvin	K
Amount of substance	mole	mol
Luminous intensity	Candela	cd

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Short Answer Type

92.

What is the S.I. unit of mass? How is it defined?

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Match The Following

93.

Match the following prefixes with their multiples:

A. micro	(i) 106
B. deca	(ii) 109
C. mega	(iii) 10–6
D. mega	(iv) 10–15
E. femto	(v) 10

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Short Answer Type

94.

A train covers a distance of 144 kilometers in two hours. What is the speed of the train in m/s.

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Long Answer Type

95.

What do you mean by Dimensional Analysis (Derived units)?

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Short Answer Type

96.

Fill in the blanks in the following conversions:
(i) 1 km = ............. mm = .............. pm
(ii) 1 mg = ............... kg = ............. ng
(iii) 1 mL = ........ L = .......... dm³

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