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Endothermic
Reactions-Exothermic Reactions-Law of Conservation of Mass
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ENDOTHERMIC
REACTION
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"All
those chemical reaction in which heat is absorbed in going
from reactants to product are known as "Endothermic reactions." |
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| These reactions can not proceed without addition of heat. | |||
| For example | |||
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2KClO3 + Heat è
2KCl + 3O2
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CaCO3 + Heat è
CaO + CO2
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Graphical
Representation
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EXOTHERMIC
REACTION
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| All those chemical in which heat is released in going from reactant to product are known as exothermic reactions. | |||
| For example | |||
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3H2 + N2 è
2NH3 + Heat
2SO2+O2 è 2SO3 + Heat |
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Graphical
Representation
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CHEMICAL
REACTION
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| A process in which chemical change in the nature and composition of substances occurs is called chemical reaction | |||
| For example | |||
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CaCO3 + HEATè
CO2 + CaO |
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CHEMICAL
EQUATION
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A chemical equation is a symbolic formation of chemical change in terms of symbols and formula. |
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CHARACTERISTICS
OF A CHEMICAL EQUATION
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| 1.
A chemical equation must be a representative of a chemical reaction. 2. It should represent molar quantities. 3. It should be balanced in terms of atoms and molecules of reactants and products. |
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| For example: | |||
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2SO2+O2 è
2SO3
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3H2 + N2 è
2NH3
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LAW
OF CONVERSATION OF MASS
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| The
law of conservation of mass indicates that during any process, mass is neither
created nor destroyed. The law was put forward by a French chemist LAVOISER in 1785. |
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| Law of conversation of mass states that : | |||
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