Chemistry most important formula | 11th std Maharashtra board

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Chemistry notes

This article will provide you most important formula of chemistry of 11th class Maharashtra board.

Chapter wise ;

1] Some basic concepts of chemistry :

• Temperature conversation

(1) celsius into Fahrenheit

   °F = 9/5(°C) + 32

(2) celsius into Kelvin

   K = °C +273.15

• Mole = mass of elements/atomic mass of that element

• Mole in gas = volume of theg gas at STP/22.4dm³mol-¹

2]Introduction to analytical chemistry :

• error 

Absolute error =Observed value -True value

Relative error= Absolute error/true value×100

• Deviation

Absolute deviation =|Observed value - mean|

Relative deviation = Mean absolute deviation/ mean × 100

• Concentration of solution

(1) Mass percent : mass of solute/mass of solution × 100%

(2) Mole fraction : no. Of moles A orB/ no. Of moles of solution 

(3) Molarity : no.of moles of solute/volume of solution in litres

(4) Molality : no.of moles of solute/mass of solvent in kg

3] Basic Analytical techniques :

R value = Distance travelled by the substance or solute/ distance travelled by the solvent

4] Structure of Atom :

• properties of atom

(1) mass number = atomic number (z) + no.of Neutron

A = Z+N

(2) Number of neutron = Atomic mass - atomic number (Z) 

N = A - Z

(3) Atomic number(Z) = no.of proton= no.of electron

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5] Chemical Bonding :

• Formal change of Atom:

• Steric number : 

•  Loan pair :

• Bond Order :

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