Question= What is Modern Periodic Table.
Answer= Dobereiner's  Triads, Newland's Law of Octaves, Mendeleev's contributions; Modern Periodic Law, The Modern Periodic Table (groups and periods.

What is Modern Periodic Table. +Harsh Puri Goswami 

Read More »

Question= What is nucleus.
Answer= The protons and neutrons are found- in the centre or nucleus of the atom.

What is nucleus. +Harsh Puri Goswami 

Read More »

Question= What is an element.

Answer= Answer= An element is a pure substance made up of one kind of atoms- having the same atomic number and which cannot be broken down- into two or more substances by any physical or chemical means.

What is an element. +Harsh Puri Goswami 

Read More »

Question= What is an atom.

Answer= An atom is the smallest particle of an element which can take part- in a chemical reaction and is consider the basic unit of matter, e.g .O,CL are atoms.

What is an atom. +Harsh Puri Goswami 

Read More »

Question= Modern atomic theory.
Answer= {1} Atoms are- divisible and destructible.
{2} Atoms are divisible- consisting of subatomic particles like- electrons, protons and neutrons.
{3} Atoms of the same element- may not be alike in all respects as seen in case of isotopes which are atoms of the- same element having the same atomic number but different mass number.

Modern atomic theory. +Harsh Puri Goswami 

Read More »

Questions= Dalton's atomic theory
Answer= {1} Atoms are- indivisible and indestructible.
{2} An atom is the smallest indivisible particle of an element.
{3} Atoms of the same element are- alike in all respect and- differ from atoms of other elements.

Dalton's atomic theory. +Harsh Puri Goswami 

Read More »

Question= What is derived unit.

Answer= Derived unit are those which depends on the fundamental units or which can be expressed in term of the fundamental units.

What is derived unit.

Read More »

Read More »

Question= What is gases.
Answer= Gases have least density, are highly compressible and have no free surface.

What is gases.

Read More »

Question= What is liquid.
Answer= Liquid have a definite mass and volume but not definite shape and are less rigid. They can flow and take up the shape of the container in which they are stored liquid have comparatively  less density, are very slightly compressible and have one upper surface.

What is liquid.

Read More »

Question= What is solid.
Answer= Solid have a definite mass, volume and shape and are highly rigid. They cannot flow, have high density, are very almost in compressible and have any number of free surface.

What is solid.

Read More »

Question= CHANGE STATE OF MATTER.
Answer= Tnterconversion of matter involves- change of matter from one state to another and back to its origional state. It is affected by change in condition such as temperature pressure etc.

CHANGE STATE OF MATTER.

>

Read More »

Question= Describe with the help of a diagram - londolts Experiment to illustrate the law of conservation of mass. Given two other example or experiment proofs to illustrate the law.
Answer= Conclusion: The weight remained the same.
     Nacl + AgNo₃= Agcl + NaNo_3.
[23+35.5] [108+14+48] [108+3.5.5] [23=14+48]  [228.5.]
     Total mass of reactants= Total mass products.

 Describe with the help of a diagram - londolts Experiment to illustrate the law of conservation of mass. Given two other example or experiment proofs to illustrate the law.

                                                                                                                                         

Read More »