08
05
07
06
01
04
02
03
some basic
concepts of
chemistry
Nature of matter
01
02
03
04 05
06
07
08
Laws of chemical
combinations
Dalton’s
atomic theory
Mole concept Percentage
composition
EF & MF
Limiting
Reactant
stoichiometric
calculations
Q) Which one of the following is not a mixture ?
(A) Tap water
(C) Salt in water
(B) Distilled water
(D) Oil in water
Laws of chemical combination
LAVOISIER
1789 1799 1803 1808
JOSEPH PROUST JOHN DALTON GAY LUSSAC
LAW OF
CONSERVATION
OF MASS
LAW OF
DEFINITE
PROPORTION
LAW OF
MULTIPLE
PROPORTION
LAW OF
GASEOUS
VOLUMES
1811
AMEDEO AVOGADRO
AVOGADRO’S
LAW
Q) Which one of the following pairs of compound
illustrate the law of multiple proportions ?
(A) H2O, Na2O
(C) Na2O, BaO
(B) MgO, Na2O
(D) SnCl2, SnCl4
ATOMS MAKE UP
ALL MATTER
ATOMS OF
THE SAME ELEMENT
ARE IDENTICAL
ATOMS OF DIFFERENT
ELEMENTS CAN COMBINE
TO FORM COMPOUNDS IN
SIMPLE WHOLE NUMBER
RATIOS
IN CHEMICAL
REACTIONS, ATOMS ARE
REARRANGED, COMBINED,
AND SEPARATED
ATOMS CANNOT BE
CREATED, DIVIDED,
OR DESTROYED
6.022 X 1023
PARTICLES
AT STP IS 22.4 L
OR 22400 ML
MASS OF
1 MOLE IS
MOLAR MASS
VOLUME OF
1 MOLE GAS IS
MOLAR VOLUME
Mole
MOLAR VOLUME
(A) 1 g of Mg(s) [Atomic mass of Mg = 24]
(B) 1 g of O2 [Atomic mass of O=16]
(C) 1 g of Li(s) [Atomic mass of Li = 7]
(D) 1 g of Ag(s) [Atomic mass of Ag = 108]
Q) Which one of the followings has maximum number of atoms ?
MASS % OF H MASS % OF O MASS % OF C MASS % OF O
Percentage composition of H2O Percentage composition of CO2
2
18 x100 16
18 x100 12
44 x100 32
44 x100
ACTUAL FORMULA SIMPLEST FORMULA
C3H6O3
C10H14N2
C12H22O11
CH2O
C5H7N
C12H22O11
Q) An organic compound contains 80% (by wt.) C & the
remaining percentage of H . The empirical formula of
this compound is :
(A) CH3 (B) CH4 (C) CH (D) CH2
FIRST IDENTIFY THE
LIMITING REACTANT
BY CALCULATING THE
REQUIRED MOLES &
AVAILABLE MOLES
OF REACTANTS.
How many burgers can be made ?
Which part is the Limiting reactant ?
A B C D
Q) The number of moles of hydrogen molecules
required to produce 20 moles of ammonia
through Haber's process is :
(A) 40 (B) 10 (C) 20 (D) 30
THEN CALCULATE
THE AMOUNT OF
PRODUCT FROM
THE AMOUNT OF
LIMITING REACTANT
Q) Mass % of carbon in ethanol is :
(A) 52 (B) 13 (C) 34 (D) 90
2 2
Q) When 22.4L of H (g) is mixed with 11.2L of Cl (g),
each at STP, the moles of HCl(g) formed is equal to :
(A) 0.5 (B) 1.5 (C) 1 (D) 2
chemistry
ELEMENTS COMPOUNDS
MATTER
PURE
SUBSTANCE MIXTURE
HOMOGENEOUS HETEROGENEOUS
