Class 9 Science
Atoms and Molecules
Question 1.
What is a matter?
Question 2.
State the law of conservation of mass.
Question 3.
Choose the correct balanced equation for the following chemical reaction.
C + O2 = CO2
a. 2C + O2 = CO2
b. 2C + 2O2 = 2CO2
c. C + 2O2 = CO2
d. C + 2O2 = 2CO2
Question 4.
State the laws of constant proportion.
Question 5.
Which of the following is referred to as the basic building blocks of an element, compound or mixture?
a. Molecules
b. Atoms
c. Both a and b
d. Neither a nor b
Question 6.
What are the postulates of Dalton’s atomic theory?
Question 7.
The abbreviation of IUPAC is ____________.
Question 8.
What is the mathematical representation of atomic mass?
Question 9.
What is the unit of measuring atomic mass?
a. amu
b. m
c.m-1
d. m2
Question 10.
___________ refers to the cluster of two or more atoms chemically bonded together and tightly held together by attractive forces
Question 11.
The number of atoms present in a single molecule is termed as its _________
Question 12.
Ar (Argon) is ___________.
a. Diatomic
b. Monoatomic
c. Triatomic
d. Tetra atomic
Question 13.
What is the atomicity of oxygen molecule?
a. 2
b. 1
c. 3
d. Either a or b
Question 14.
Choose the atomicity of carbon dioxide.
a. 2
b. 1
c. 3
d. Either a or b
Question 15.
SO3 is ___________.
a. Diatomic
b. Monoatomic
c. Triatomic
d. Tetra atomic
Question 16.
State whether the given statement is true or false.
In water (H2O) ratio of hydrogen and oxygen is 1:8.
Question 17.
Fill a and b in the given picture.
a. a = ion+; b = ion-
b. a = ion-; b = ion+
c. Both a and b.
d. Neither a nor b.
Question 18.
Which of the following statement is true?
a. Na+ is monoatomic.
b. NO3- is monoatomic.
c. Na+ is polyatomic.
d. K+ is polyatomic.
Question 19.
What is valency?
Question 20.
How will you calculate the valency of chlorine?
**********
In summary, problem-solving after learning a theoretical concept on CBSE Atoms and Molecules Class 9 Science is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.
You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.
Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.
All About Daily Practice Problems on Class 9 Science Atoms and Molecules NCERT Chapter 3
Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 9 Science Atoms and Molecules NCERT Chapter 3 useful.
Last but not least, to get the best hold on Class 9 Science Atoms and Molecules NCERT Chapter 3, do not forget to check out: