"OM SAI RAM"
Spectrum Classes
Spectrum Classes By Er.Shyam Pachori CL 157 D.D Nagar Mob.:9039803981
Spectrum Classes
Worksheet :- Atom &
Molecule
Q.1
The atomic mass of an element is in fraction. What does it mean?
Q.2
Find out the ratio by mass of the
combining elements in the following compounds
(a)
MgCO3 (b)CH3OH (c)CaCl2 (d)NH3
Q.3
Which postulate of Dalton’s Atomic
theory is the basis of law of conservation of
mass?
Q.4 What are ions? Its type &
the bond formed by ions ?
Q.5 How many moles
are present in 11.5 g of sodium sulphate .
Q.6
Difference between molar mass & molecular mass .
Q.7
State and prove law of chemical combination.
Q.8
Is there any exception to law of conservation
of mass?
Q.9 If 12 g of carbon is burnt in
the presence of 32 g of oxygen, how much carbon dioxide will be formed?
Q.10 Which has more number number of
atoms, 100 grams of sodium or 100 grams of iron
given, atomic mass of Na = 23u, Fe =
56
Q.11Explain postulates of Dalton’s
atomic theory & Drawbacks
of Dalton’s Atomic Theory ?
Q.12
The size of sodium atom is bigger than that of hydrogen atom. Why ?
Q.13
Define the following
(a)
Atomicity (b) Valency (c) Atomic Number (d) Atomic mass (e) Mass Number
Q.14
Define Isotopes and various isotopes used for different Work .
Q.15
Define Isobars , Isotones , iso electronic species with Example .
Q.16
Define 1 mole of a gas and 1 amu ?
Q.17
Differentiate between atom and molecule.
Q.18 Write Chemical formula for
(a) Potassium
carbonate (b) Aluminium hydroxide (c) Ammonium sulphate (d) Carbon
tetrachloride
(e) Ammonium carbonate
(f) Potassium sulphate
(g) Cupric chloride
(h) Aluminium nitride
(i) Calcium phosphate
Q.19 Calculate the molar mass of the
following
substances.
(a) Ammonia (b) Hydrochloric acid (c)
Phosphorus molecule (d) Hydrogen molecule (e) Oxygen molecule
(f) Sulphur dioxide
Q.20
Find the number of moles of
(a) 48 g of oxygen gas (b) 18 g of H2 O molecules (c) 22 g of CO2
gas (d) 51 g of NH3 gas
Q.21 Calculate the percentage
composition of carbon in CO2 .
Q.22 Calculate the number of
aluminium ionswhich are present in 0.0051g
of aluminium oxide.
Q.23 Calculate the percentage
composition of glucose(C6 H12 O6 )
Q.24
When 10g of sulphur is burnt in 10g of oxygen 20g of sulphur dioxide is
produced ? Find the mass of sulphur
dioxide formed on burning 20g of sulphur
in 30g of oxygen ? Justify your answer
by stating the law which governs your answer
Spectrum
Classes
Worksheet:- Structure of Atom
Q.1Fill In the Blanks
(a) The electronic configuration of
silicon is …………….
(b) _____ electrons are responsible for the
chemical properties of an atom.
(c) Rutherford’s model of an atom was modified by
_______.
(d) ____ is an isotope of carbon
used in determining the age of dead plants.
(e) An atom with 3 protons and 4 neutrons will
have a valency of ________
Q. 2The description of atomic
particles of two elements X and Y is given below
(i) What is the atomic number of Y (ii) What is the mass number of X
(iii) What is the relation between X
and Y (iv) Which element/elements do
they represent
(v) Write the electronic
configuration of X (vi) Write the
cation/anion formed by the element
Q.3 (a)Explain Bohr and Bury rules
for distribution of electrons into different shells. (b) Draw the electronic
structure of element X with atomic number 17 and element Y with atomic number 16 ?
Q.4 Why is Thomson's model of an
atom compared with a watermelon?
Q.5 (i) Why is an alpha particle
called a helium nuclei? (ii) What is the charge on the above mentioned
particle?
Q.6 Why Rutherford take only gold
sheet ? , give any two reason .
Q.7 Why do helium,
neon & argon have a zero valency?
Q.8
What are the limitations of J. J. Thomson's model of the atom?
Q.9What
are the salient feautres of Bohr's Atomic Model? How is it advantageous over
Rutherford's
Nuclear Model?
Q.10 Will Cl -35 and Cl -37 have
different valences?
Q.11Calculate the number of neutrons
present in the nucleus of an element X which is represented as15 X31
.
Q.12
What were the drawbacks of Rutherford’s model of an atom?
Q.13
Write two differences between isobars and isotopes.
Q.14 When a gold sheet is bombarded
by a beam of Alpha particles, only a few of them get deflected whereas most go
straight un deflected . Why?
Q.15 Is it possible for the atom of
an element to have one electron, one proton and no neutron? If so, name the
element.
Q.16 State one use each of an
isotope of (i) uranium , (ii) iodine (iii) Carbon (iv) Sodium
Q.17 The electronic configuration of
potassium (K) is 2, 8, 8, 1 instead of 2, 8, 9 though the M shell can accommodate up to 18 electrons.
Explain.
Q.18
If chlorine atom is available in the form of two isotopes 17Cl35
(75%) & 17Cl37 (25%)
Calculate the average atomic mass of chlorine atom .
Q.19 (a) Which kind of elements have
tendency to lose electron ? Give example .
(b) What are
nucleons ?
Q.20 (a) Write the no. of valence
electrons in (a) Na atom and Na+ (b) O atom and O2- (b) An
element “E“ loses 2e- to form E+2 ion .What will be the
chemical formula of the compound formed
between E and oxygen .
Q.21 Write the electronic
configuration of magnesium atom and magnesium ion. How do these configurations
differ ? Support your answer in the form of atomic structures .
Q.22 Fill in the Blanks
1. Plum pudding Model of atom was
discovered by _______________
2. Combining capacity of an atom is
called _______________
3. Alpha particle scattering
experiment of Rutherford led to discovery of _________
4. Number of neutrons in is 53
Br 81 _____________
5. __________ are atoms having the
same mass number but different atomic number.
6. The charge on the electron is
found to be ________ coulombs.
Q.23 What do you understand by
valency of an element? What is valency
of boron , Chlorine ,Sulphur & Magnesium ?
Q.24 From what observations do you
derive the following inferences?
(i) The most of the space inside the
atom is empty.
(ii) The volume of the nucleus is
very small.
(iii) Anode rays consist of positively
charged particles.
Q.25 Cl- has completely
filled K&L shells. Explain.
Q.26 Draw a chart representing Characteristics
of the fundamental subatomic particle’s
like mass , charge ,Discovered By Scientist .
Q.27
(a) You are given an element. Find out
(i)
Number of protons, electrons and neutrons in ‘X’. (ii) Valency of
‘X’.
(iii)
Electronic Configuration of ‘X’.
(b)
If bromine atom is available in the form of, say two isotopes 35 (49.7%) and
37 (50.3%). Calculate the average atomic mass of bromine atom.
Q.28 State the problem of atomic
structure which was solved after the discovery of neutron.
Q.29 Why Neutron Discovered very
Later the discovery of proton ?
Q.30 Give reasons:
(a) Mass number of an atom excludes
the mass of an electron.
(b) Nucleus of an atom is charged.
(c) Alpha particle scattering
experiment was possible by using gold foil only and not by foil of any other
metal.
Spectrum Classes By Er.Shyam Pachori CL 157 D.D Nagar Mob.:9039803981
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