CBSE Class 9 Science Atoms and Molecules Worksheet Set H

Read and download free pdf of CBSE Class 9 Science Atoms and Molecules Worksheet Set H. Download printable Science Class 9 Worksheets in pdf format, CBSE Class 9 Science Chapter 3 Atoms and Molecules Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 9 Assignments and practice them daily to get better marks in tests and exams for Class 9. Free chapter wise worksheets with answers have been designed by Class 9 teachers as per latest examination pattern

Chapter 3 Atoms and Molecules Science Worksheet for Class 9

Class 9 Science students should refer to the following printable worksheet in Pdf in Class 9. This test paper with questions and solutions for Class 9 Science will be very useful for tests and exams and help you to score better marks

Class 9 Science Chapter 3 Atoms and Molecules Worksheet Pdf

 
ATOMS AND MOLECULES

1 Mark Questions:
 
i. State the law of constant proportion.
 
ii. Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?
 
iii. Write the molecular formula of a diatomic gas and a triatomic gas.
 
iv. Name the term used for the symbolic representation of a molecule of an element or a compound? Give an example of it.
 
v. In the reaction between copper sulphate solution and sodium sulphide solution, 15.9g copper sulphate completely reacts with 7.8g of sodium sulphide. It is observed that 9.5g of copper sulphide is formed. What is the mass of sodium sulphate solution formed?
 
vi. Why is the symbol of gold taken as Au?
 
vii. Calculate the formula unit mass of NaHCO3. (at.mass: Na=23u H=1u C=12u,O=16u)
 
viii. Define Avogadro’s number. What is its value?
 
ix. What is the ratio between masses of carbon and oxygen in CO2?
 
x. Define atomicity of an element.
 
xi. Nitrogen and hydrogen are present in ammonia in the ratio 14:3 by mass.What would be the mass of nitrogen if the actual mass of hydrogen is 9g?
 
2 Mark Questions:
 
i. Silver nitrate solution was mixed with 5g of sodium chloride solution to verify law of conservation of mass. 8.1 gram of silver chloride was formed and sodium nitrate formed was equal to half of the amount of silver nitrate solution used. What is the amount of silver nitrate used and sodium nitrate formed?
 
ii. (a)What is the significance of symbols?
 
(b)What do the abbreviations 2O and O2 stand for?
 
iii. (a)Taking the example of water, explain the law of constant proportion.
 
(b)Which postulate of Daltons’ atomic theory explains this law?
 
iv. What are polyatomic ions? Give any two examples.
 
v. Give the names of elements present in:-
 
(a)sodium nitrate (b) ammonium hydrogen carbonate (c) iron(III)sulphate
 
vi. Write the formulae and names of compounds formed by combination of:
 
(a) Fe3+ and SO42- (b) NH4+ and CO32-
 
vii. Using the valencies, write down the chemical formulae of the following compounds:
 
(a)calcium nitrate                            (b) manganese(IV) oxide
 
(c) ammonium phosphate                (d) aluminium chloride
 
 
viii. Define following :- (a)formula unit mass (b) molecular mass
 
ix. Define mole and find the number of moles present in 1.6g of oxygen gas.
 
x. (a)How many grams of chlorine are contained in one mole of chlorine?
 
(b) How many molecules are there in 7.1g of chlorine gas?
     (atomic mass: Cl=35.5u)
 
xi. Write the valency of each cation and anion in the following compounds.
 
(a) FeN ( b) CuSO4
 
(c) AlPO4 (d) NH4HCO3

3 Mark Questions:
 
i. (a) What are ionic and molecular compounds? Give examples.
 
(b) Find the ratio by mass of the combining elements in the following compounds.
 
(a) SO2 (b) CaH2 ( at.mass: S=32u , O=16 , Ca=40u , H=1u )
 
ii. Calculate the mass of 0.5 mole of sugar (C12H22O11).
 
(at.mass: C=12u, H=1u, O=16u).
 
iii. Name the ionic compound that is obtained from sea water and calculate the number of moles present in 5.85 g of this compound.
 
iv. What is the atomicity of sulphur. Calculate the number of moles in 0.4g of sulphur powder. ( at.mass of S= 32 )
 
v. Calculate the number of moles:
 
(a) 3.011 x 1023 atoms of carbon (b) 9g of water
 
( at. mass: O = 16 u, H=1u C = 12u )
 
vi. (a) Which has more number of particles , 48g of Mg or 7g of nitrogen?
 
(at.mass: Mg = 24 u, N = 14 u)
 
(b) State the postulates of Dalton’s atomic theory.
 
vii. Calculate the number of atoms in 120g of calcium and 120g of iron. Which one has more number of atoms? (at.mass: Ca = 40 u , Fe= 56 u)
 
viii. (a) Calculate the number of molecules in 90g of C6H12O6.
 
( at.mass: C=12u H=1u O=16u)
 
(b) Calculate the mass of 0.5 moles of nitrogen gas. (at.mass N=14u)
 
ix. Name and state the laws of chemical combination.
 
x. An element P shows two valencies 3 and 4 .Write the formulae of possible oxides of this element.
 
xi. Calculate the molecular mass / formula mass of each of the following and write the corresponding value of gram molecular mass.
 
(a) ethanoic acid (CH3COOH) (b) sugar (C12H22O11)
 
(c)sodium carbonate (Na2CO3) (d) copper sulphate (CuSO4.5H2O)
 
(at.mass: H=1u O=16u C=12u Na=23u S=32u Cu=63.5u )
 
xii. Define the following terms :
 
a) atom    b) molecule     c) polyatomic molecule    d) unified mass
 
e) relative atomic mass    f) molecular formula       g) molar mass
 
Multiple choice questions :
 
i) The symbols of the elements cobalt , zinc , manganese and fluorine written by a student are as follows. Which symbol is the correct one?
 
a) CO             b) ZN          c) Mg                 d)F
 
ii)The number of electrons in an ion X3- is 10. The atomic number of X is :
 
a)7               b)5              c)10                  d)8
 
iii)If 12g of carbon has n atoms , then what is the number of atoms in the same amount of Mg? (Given that atomic mass of C=12u & Mg=24u)
 
a)n               b) 2n           c) n/2               d)1.5n
 
iv) Which of the following represents the correct chemical formula?
 
a)NaO          b)Na3N       c)NaSO4            d)NaS
 
Assertion-Reason questions: 
 
The questions below consist of statement of an assertion and a reason.
 
Choose the correct option.
 
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
 
(b) If both Assertion and Reason are true but Reason is not the correct  explanation of Assertion.
 
c) If Assertion is correct but Reason is incorrect
 
d) If Assertion is incorrect , but reason is correct
 
i)Assertion: One mole of hydrogen atom is equal to half mole of hydrogen molecule.
 
Reason: Every molecule of hydrogen is constituted by two atoms.
 
ii)Assertion: Atoms are electrically neutral.
 
Reason: Atoms contain equal number of electrons and protons which are oppositely charged.
 
iii)Assertion: A positively charged atom is called a cation.
 
Reason: A cation is formed when an atom gains one or more protons.
 
 
 
 
Please click on below link to download CBSE Class 9 Science Atoms and Molecules Worksheet Set H

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