Chemistry One-Liners for various competitive examinations

Chemistry One-Liners for various competitive examinations

 

 

 

 

 

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Here are some important Chemistry one-liners for students competing for various exams

 

Watch some of the important Chemistry Bits below.

1-Ionisation enthalpy- It is the minimum energy required to remove an electron from an isolated gaseous atom of an element to form a positive ion.

2-Electronegativity- It is the ability of an atom to attract the shared pair of electrons towards it.

3-Electron gain enthalpy- It is the energy released by an element when an extra electron is added to its neutral gaseous atom.

4-REDOX REACTION- A reaction which involves oxidation and reduction occurring simultaneously together are called redox reaction.

5-Batteries- These convert chemical energy into electrical energy. Two types of batteries are used, i.e. primary and secondary

6-Fuel Cells- These cells convert energy from the combustion of fuels such as Hydrogen, Carbon Monoxide, Methane directly into electrical energy

7-A catalyst is a substance which alters the rate of reaction. Catalysts are specific in their action. Its main function is to decrease the activation energy.

8- Metals are generally good conductors of heat and electricity

9-Alloys are homogeneous mixtures of metals and cannot be separated into their components by physical methods

10-The bond formed by the transfer of electrons from one atom to another is called electrovalent bond and the compound is called electrovalent compound or an ionic compound.

11-The phenomenon in which a substance mixes with another because of molecular motion, even against gravity is called diffusion

12-The process of separation of various constituents/ fractions of petroleum is known as refining.

13-Urea was the first organic compound prepared in the laboratory. Urea was prepared by Wohler (1828) from inorganic compound i.e. ammonium cyanate

14-Acetic acid was the first organic compound synthesized from the elements by Kolbe

15-Biochemical Oxygen Demand (BOD) is the total amount of oxygen (in mg) required by microbes to decompose the organic matter present in 1L of the water sample.

 

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