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प्रश्न
What is a chemical equation? Why it is necessary to balance it?
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उत्तर
A chemical equation is the symbolic representation of a chemical reaction using the symbols and formulae of the substances involved in the reaction.
A chemical equation needs to be balanced because a chemical reaction is just a rearrangement of atoms.
Atoms themselves are neither created nor destroyed during the course of a chemical reaction.
The chemical equation needs to be balanced to follow the law of conservation of mass.
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संबंधित प्रश्न
Write word equation for the following skeletal equation:
\[\ce{Zn + HCl -> ZnCl2 + H2}\]
Write symbolic representation for the following word equation and balance them :
Calcium oxide + Water → Calcium hydroxide
Show the formation of Na2O by the transfer of electrons.
Write the chemical equation for the following word equation and balance them.
Calcium + Nitrogen → Calcium nitride
Grills of doors and windows are always painted before they are used.
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
\[\ce{C +2S -> CS2}\]
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
Balance the following simple equation:
NaOH + Cl2 → NaCl + NaClO + H2O
Write a balanced equation for the following word equation:
Potassium nitrate → Potassium nitrite + Oxygen
Match the columns.
| Reactants | Products | Types of chemical reaction | ||
| 1. | MgH2 | → | Mg + H2 | Endothermic |
| 2. | 2H2S + SO2 | → | 3S + 2H2O | Oxidation |
| 3. | CaO + H2O | → | Ca(OH)2 + heat | Exothermic |
| Redox | ||||
