ENDOTHERMIC REACTION
| |
"All those chemical reaction in which heat is absorbed in going
from reactants to product are known as "Endothermic reactions." | |
These reactions can not proceed without addition of heat. | |
For example | |
2KClO3 + Heat è 2KCl + 3O2
| |
CaCO3 + Heat è CaO + CO2
| |
Graphical Representation
| |
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 | |
3H2 + N2 è 2NH3 + Heat
2SO2+O2 è 2SO3 + Heat | |
Graphical Representation
| |
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 | |
CaCO3 + HEATè CO2 + CaO3H2 + N2 è 2NH3
| |
CHEMICAL EQUATION
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A chemical equation is a symbolic formation of chemical change in terms of symbols and formula. | |
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. | |
For example: | |
2SO2+O2 è 2SO3
| |
3H2 + N2 è 2NH3
| |
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. | |
Law of conversation of mass states that : | |
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Saturday, 30 August 2014
Endothermic Reactions-Exothermic Reactions-Law of Conservation of Mass
Labels:
Class IX
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