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Test Paper for Atoms and Molecules





Given below are the Class 9 Science CBSE Test Paper for Atoms and Molecules
a. Concepts questions
b. Calculation problems
c. Multiple choice questions
d. Long answer questions
e. Fill in the blanks
Hope you like them and do not forget to like , social share and comment at the end of the page.

Question 1
State the law of mass conservation.

Question 2
What do you understand by the law of constant proportion?

Question 3
Who was responsible for coining the term atom?

Question 4
What is an atom?

Question 5
What is a molecule?

Question 6
What is atomicity?

Question 7
Define atomic mass unit.

Question 8.
Define ion.

Question 9
Provide a difference between cations and anions, along with an example for each.

Question 10
Define Avogadro’s constant.

Question 11
(a)Explain how atoms exist.
(b)What do you understand by atomicity?
(c) Explain polyatomic ions.

Question 12
Explain atomic mass and gram atomic mass. Why does mass have different expressions viz, ‘u’ and ‘gm’?

Question 13
Define a mole. Give the importance of the mole.

Question 14
How many molecules are present in 1 ml of water?

Question 15.
Calculate the molecular mass of glucose, C6H12O6.

Question 16.
H2O is the formula for water. What information do you get from this formula?

Question 17
What is the formula unit mass of CaCl2and NaCl.
(Na = 23, Cl=35.5, Ca=40)

Question 18
(i) Name the body which approves the nomenclature of elements and compounds.
(ii) The symbol of sodium is written as Na and not as S. Give reason.
(iii) Name one element which form diatomic and one which form tetra atomic molecules.

Question 19
10.0 g CaCO3 on heating gave 4.4 g of CO2 and 5.6 g of CaO. Show that these observations are in agreement with law of conservation of mass.

Question 20
Why are Dalton's symbol not used in chemistry?

Question 21
What is the difference between2O, O2and O3.

Question 22
Find out
(1) the mass of a single oxygen atom
(2) the mass of a single oxygen molecule
(3) the mass of a mole of oxygen gas
(4) the mass of an oxygen ion
(5) the number of atoms in a mole of an oxygen molecule.

Question 23
What is the atomicity of oxygen and phosphorous?

Question 24
How many moles of $SO_2$ have same mass as 3 moles of oxygen?



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Also Read





Class 9 Maths Class 9 Science
Reference Books for class 9 science

Given below are the links of some of the reference books for class 9 science.

These books by S.Chand Publications are detailed in their content and are must have books for class 9 students.
  1. Science for Ninth Class Part1 Physics
  2. Science for Ninth Class Part2 Chemistry
  3. Science for Ninth Class Part3 Biology
Some other books that might be worth considering are
  1. Oswaal CBSE Question Bank Class 9 Science Chapterwise & Topicwise We all know importance of practicing what we have studied. This book is perfect for practicing what you have learned and studied in the subject.
  2. Pearson Foundation Series (IIT-JEE/NEET) Physics, Chemistry, Maths & Biology for Class 9 (Main Books) | PCMB Combo These Foundation books would be helpful for students who want to prepare for JEE/NEET exams. Only buy them if you are up for some challenge and have time to study extra topics. These might be tough for you and you might need extra help in studying these books.
  3. Foundation Science Physics for Class - 9 by H.C. Verma This is one of my favorite Physics book for class 9. Most of the book is within the limits of CBSE syllabus. It might overwhelm you with its language but I feel if you can understand the content is authentic with plenty of problems to solve.

You can use above books for extra knowledge and practicing different questions.







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