Question

State the main characteristics of chemical reaction. Give at least one example of each case.

Answer 1

We know that a chemical reaction is a process in which reactants react chemically as well as convert into product by chemical transformation. For example; Respiration we inhale oxygen which reacts with glucose along with that it produces carbon dioxide, water as well as energy. The simple chemical reaction is given by: ${{C}_{6}}{{H}_{12}}{{O}_{6}}\text{ }+\text{ }6{{O}_{2}}\to 6C{{O}_{2}}\text{ }+\text{ }6{{H}_{2}}O\text{ }+\text{ }Energy$

Complete step-by-step answer: Chemical reactions are of many types, here we have most common eight types of chemical reactions which are:
1.Decomposition Reaction: In decomposition reaction, molecules/compounds break down into two or more than two simpler chemically new substances. For example, electrolysis of water. In electrolysis of water water breaks down into hydrogen as well as oxygen which show completely different properties than water.
Reaction: $2{{H}_{2}}O\text{ }\xrightarrow{electricity}\text{ }2{{H}_{2}}\text{ }+\text{ }{{O}_{2}}$
2.Combination Reaction: In combination reaction, two/more molecules are combined together chemically to form new substance burn magnesium ribbon/magnesium it gives grey-black ash of magnesium oxide.
Reaction: $~Mg\text{ }+\text{ }{{O}_{2}}\to \text{ }MgO$
3.Combustion Reaction: It is an exothermic reaction which releases energy generally in the form of heat. Its reaction between fuels as well as an oxidant within generally atmospheric oxygen which produce smoke, water along with heat. For example, when we burn methane it gives carbon dioxide with water.
Reaction: $C{{H}_{4}}+\text{ }2{{O}_{2}}\to C{{O}_{2}}+2H$
4.Neutralization Reaction: In these reactions acid and base react with each other form salt and water. For example, hydrochloric acid reacts with sodium hydroxide (base) and forms sodium chloride (salt) and water.
Reaction: $2K+MgC{{l}_{2}}\to 2KCl+M$
5.Precipitation Reaction: In these reactions an insoluble precipitate is formed. In precipitation reaction, two soluble salt in aqueous solution are combined as well as form insoluble precipitate.
Reaction: $AgNO{{3}_{\left( aq \right)}}+\text{ }KC{{l}_{\left( aq \right)}}\to \text{ }AgCl\text{ }+\text{ }KN{{O}_{3\left( aq \right)}}$

Note: Note that temperature increases, solubility of ionic solutions increases with formation of anion-containing compounds. Solids must be divided to have greater solubility. Concentration builds at solvent surfaces, causing higher crystallization in a still solution, so stirring solution prevents build-up by maximizing net dissolving rate. rate of crystallization will depend on concentration of solute at crystal surface, depending mainly on temperature, as opposed to rate of solubility