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Some basic concepts of chemistry for 11th.
MATTER
Anything that has mass and occupies space. |
STATES OF MATTER
SOLID |
LIQUID |
GAS |
Particles are held very close to each other |
Particles are close but packed loosely compared to solids |
Particles are very far apart compared to solids and liquids. |
Not much freedom for movement of particles |
Particles can move around. |
Movement of particles is easy and fast. |
Definite volume & shape. |
Definite volume but lack definite shape. |
Neither definite volume nor definite shape. |
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VOLUME
Amount of space occupied by a substance.
(length)³
1000cm³ = 1000mL = 1dm³ = 1L |
MASS AND WEIGHT
Mass- amount of matter present in substance |
Weight- force exerted by gravity on an object. |
One should be careful in using these terms and not confuse one with the other.
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SCIENTIFIC NOTATION
A way of expressing a number which is too large or small written in decimal form.
Represented in the form **N×10n
NOTE- only a single digit should be placed to the left of the decimal point
In the number 452.9646, we bring all the digits to the left-side of the decimal point to the right side except for the first digit. i.e., 4.529646 × 102
eg- 4345.83 = 4.34583 × 103
In the number 0.00023, we bring all the digits from the right-side of the decimal point to the left except for the last digit.
eg- 0.00203 = 2.03 × 103 |
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