Name: Preparation of Insoluble Salts
Uploaded: 2019-07-19
Duration: 2 min 50 s
Description: A precipitation reaction is an example of a "Double Displacement Reaction" and is one of the ways to produce insoluble salts. Let us learn about it.

Question

What is a chemical equation? What information do we get from a chemical equations? Explain with the help of examples, why is it necessary to balance a chemical equation?

Accepted Answer

The chemical equation is the representation of a chemical reaction in terms of symbols and formula of atoms or molecules involved in the reaction as reactants and products. For example, the burning of a magnesium ribbon can be expressed as follows: $\underset{Magnesium}{2 Mg (s)} + \underset{Oxygen}{O_{2} (g)} \to \underset{Magnesium oxide}{2 MgO (s)}$

The main information given by balanced chemical equations are:
1. The number of atoms or molecules involved in the reaction and that must be equal according to the law of conservation of mass.
2. The physical state of reactants and products.
3. The direction of the reaction.
4. Name of the reactants and products.
5. Mass and volume relationship between products and reactants.
6. The heat evolved or heat absorbed in a chemical reaction.

$N_{2} (g) + 3 H_{2} (g) \to_{Fe / Mo}^{(450 ° C) 200 - 900 atm} 2 {NH}_{3} (g)$

This equation gives the following information:
One mole ( $28 g$ ) of nitrogen reacts with 3 moles of hydrogen (reactant) to give 2 moles of ammonia.
The physical state of $N_{2}, H_{2} and {NH}_{3}$ is gas.
The reaction condition are:
Temperature = $450^{0} C$
Pressure= $200 - 900 atm$
Catalyst: $Fe + Mo$

What is a chemical equation? What information do we get from a chemical equations? Explain with the help of examples, why is it necessary to balance a chemical equation?

Important Questions on Chemical Reactions and Equations

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