Question

How many condition are there in chemical reaction

Answer 1

Answer:

Explanation:

four conditions

Hope it helps you

Answer 2

Answer:

Conditions required in Chemical Reaction

Chemical reactions vary with time. Some chemical reactions take place in a very rapid way as soon as they are mixed with reactants while some may take a long time that we feel there is no any reaction taking place. The knowledge of chemical reaction is important in the view of industries as some reactions need to be accelerated while some need to be slow down. The change in the concentration of any one of the reactants per unit time that is needed to complete the reaction is said to be the rate of chemical reaction. There are various factors that affect the rate of chemical reaction. Some of the major conditions or factors are:

Surface Area

The rate of chemical reaction is slow if the surface area of the reactants is small as there is less chance to contact between the reactants. On the other hand, when the surface area is big, the rate of chemical reaction increases. So, in order to increase the reaction rate, the surface area of the reactants should be larger.

Example:

When large-sized granulated zinc is treated with dilute hydrochloric acid, they react together rapidly and form hydrogen gas and zinc chloride.

Zn + dil. 2HCL → ZnCl2 + H2 ↑

Catalyst

A catalyst is a substance that changes the speed of a chemical reaction without undergoing any changes.

Example:

Manganese dioxide (MnO2) acts as a catalyst in the decomposition of potassium chlorate on heating at low temperature. At the end of the chemical reaction, the amount of catalyst remains similar to that of the beginning.

2KClO3 −→−−−−−−MnO2/240oC 2KCl + 3O2 ↑

Pressure

Some chemical reaction takes place only by applying the pressure. The certain amount of pressure is necessary for them to conduct the reaction.

Example:

When sulphur and potassium chlorate are mixed together and placed under high pressure, they explode loudly. Similarly, nitrogen reacts with hydrogen under high pressure to give ammonia gas.

(1vol)N2+(3vol)3H2−→−−−−−−−−−500oC,FeandMo200−900atm(2vols)2NH3

Heat

There are various reactions that take place only under the certain temperature. When heat is supplied to the reactants they go under reaction as heat also increases the rate for the chemical reaction.

Example:

There is a reaction between copper and sulphuric acid on heating that produces SO2.

Cu + Conc. 2H2SO4 −→Δ CuSO4 + 2H2O

Light

Light is also one of the factors that stimulate the rate of reaction. There are some reactions that undergo only in the presence of light.

Example:

Hydrogen reacts violently with chlorine in the presence of diffused sunlight to produce hydrogen chloride.

H2 + Cl2 −→−−−−sunlight 2HCl

In the presence of sunlight, green plants manufacture food in the form of glucose using carbon dioxide and water as raw material.

6H­2O + 6CO2 −→−−−−−ChlorophyllSunlight

catalyst

A chemical substance that changes the rate of chemical reaction without undergoing any permanent changes during the course of the chemical reaction is said to be a catalyst. The process through which a catalyst changes the rate of chemical reaction is said to be catalysis. Catalyst either increases or decreases the rate of chemical reaction. Catalysts are of two types: Positive Catalyst and Negative Catalyst.

Positive catalyst is defined as the catalyst which increases the rate of chemical reaction. For example: Manganese dioxide (MnO2), a positive catalyst increases the rate of decomposition of hydrogen peroxide.

2H2O2 −→−−MnO2 2H2O + O2 ↑

Negative catalyst is defined as the catalyst which decreases the rate of chemical reaction. For example: Glycerin [C3H5(OH)3], a negative catalyst that decreases the rate of decomposition of hydrogen peroxide into water and oxygen.

2H2O2 −→−−−−−−C­3H5(OH)3 2H­2O + O2