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Title: Atoms, molecules and chemical arithemetic
Description: some important chemical laws like laws of conservation of mass, laws of definite porportion , avagadro law and basic terms atoms, molecules ,elements and dalton atomic theory , some common elements and their symbols, important S.I units molarity and molality concept and limiting reagent concept.
Description: some important chemical laws like laws of conservation of mass, laws of definite porportion , avagadro law and basic terms atoms, molecules ,elements and dalton atomic theory , some common elements and their symbols, important S.I units molarity and molality concept and limiting reagent concept.
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Module 1 Some basic concepts of chemistry
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Note :- this pdf is specially for quick revision it contains important topics which have more
chances that they are coming in final exams
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In every chemical reactions, total masses of all the reactants is equal to the masses of all the
products
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In a given chemical compound the percentage of mass remains constant either it is natural or
synthetic
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Those reactions in which reactants are same but products are different then if the mass of the
one reactant is constant then mass of other reactants in the simple ratio
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of
molecule and atoms
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1
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2
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3
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4
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What is Atom?
The tiny particles of an element is known as atom
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What is molecules?
A molecule is the smallest particle of matter which can exists independently
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There are two types of molecules are present :
1
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H2, N2 , O2 is an example of the diatomic molecules
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Polyatomic molecules : Molecules containing more than two atoms called polyatomic
molecules
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An element is a substance that cannot be separated into simpler substances by chemical
means
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Name
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Symbol
Name
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Cu
Arsenic
As
Phosphorus
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Pb
Barium
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Pt
Magnesium
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Bi
Potassium
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Mn
Bromine
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Si
Mercury
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F
Calcium
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Ni
Gold
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C
Nitrogen
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H
Chlorine
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Ag
Iodine
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Cr
Sodium
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Co
Zinc
Zn
Iron
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blogspot
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I units
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1 mol =6
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022×10^23 elementary entities
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It's symbol is 'amu'
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1 amu = Mass of one C-12 atom/12
Molecular mass
It is defined as it is the sum of atomic masses of the elements present in a molecule
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For ex :Suppose we have to find Molecular mass of methane (CH4)
C = 12 u
H=1u
CH4 = ( 12
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008 u )
=16
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Mass % of an element = mass of that element in the compound × 100
—————————————————————
molar mass of the compound
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To understand the concept of Percentage composition deeply , let's take an example of water
(H2O)
Molar mass of water = 18
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of moles of solute
————————————
Vol
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of moles of solute
————————————
mass of solvent (kg)
S
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I unit is mol/kg or 'm'
Molarity of a solution is equal to the no
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Molality of a solution is equal to the no
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Limiting reactant
The reactant
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foropenlearners
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Title: Atoms, molecules and chemical arithemetic
Description: some important chemical laws like laws of conservation of mass, laws of definite porportion , avagadro law and basic terms atoms, molecules ,elements and dalton atomic theory , some common elements and their symbols, important S.I units molarity and molality concept and limiting reagent concept.
Description: some important chemical laws like laws of conservation of mass, laws of definite porportion , avagadro law and basic terms atoms, molecules ,elements and dalton atomic theory , some common elements and their symbols, important S.I units molarity and molality concept and limiting reagent concept.