Atomic models
Thomson’s model of an atom Thomson proposed the model of an atom to be similar to that of the Christmas pudding. Thomson proposed that An atom consists of a positively […]
Distillation and fractional distillation.
Distillation is a type of separating process in which two miscible liquids are separated from each other by using their different boiling points. the one with lower boiling point , […]
what is valency ? how to calculate it?
Valency :- “It is the combining capacity of an atom”. it also indicates the number of electrons that can be gained , lost or shared . It decides that how […]
Full explanation of mole concept.
The word mole means pile up . This concept originated from a simple problem that was faced by the scientists to calculate the reactions. they needed a concept that could […]
A Short intro to acid, base and indicators.
Acid base and salts Acids:- these are the substances that Are sour in taste. Turn blue litmus red. Give H+ ions. Can accept a pair of electrons. Base :- These are the substances that Are bitter in taste. Turn red litmus blue. Soapy in touch. Give OH– ions. How to recognise the acid and bases? To answer this question lets […]
Basics of chemical reactions and chemical equations.
Chemical Change The change which give rise to new substances with new properties that are totally different from the starting matter. 2H2 + O2 ———> 2H2O Chemical changes are normally accompanied by the following changes:- 1. change in state 2. Change in colour 3. Change in temprature 4. Evolution of gas Chemical reaction Representation of a chemical change in […]
How to revise Digestive system in an easy way?
Human digestive system includes two basic things Alimentary canal 2. Digestive glands 1 Alimentary canal : human alimentary canal is basically a pipe of varying diameter which is designed for […]
The galvanised iron lost its zinc coating even after it doesn’t corrode. Why does this happen?
Lets look from a different angle corrosion is basically oxidation and in oxidation the electrons are lost. Here we have zinc coated on iron being more reactive the zinc will tend to loose the electrons even if the iron is exposed, even then being good conductor the electrons are given to the iron by the zinc. So actually the lost […]
The second electron affinity of oxygen is positive, what does that mean?
Electron affinity is the amount of energy change during the addition of an electron to an isolated gaseous atom. It can be positive as well as negative. Negative electron affinity means that the energy is released during the addition of electron. Which is a favorable condition for gaining an electron. But positive value means that we have to supply the […]
What is the difference between stereoisomers, optical isomers and enantiomers?
Stereoisomers:- these are the compounds that have same molecular formula but different arrangement of atoms in the space. Optical isomers:- the compunds that have same molecular formula but they rotate the plane polarised light to the different side, right side-dextrorotatory and left levorotatory. Enantiomer:- these are the compounds that are mirror images of each other and if they are present […]
