Chapter 3 Atoms and Molecules of Unit I Matter-Its Nature and Behaviour, NCERT Grade 9 depicts about the ideas of divisibility of matter. The solutions provided for different exercises in this chapter will provide the learner a further overview of Atoms and Molecules. The simple and comprehensible solutions will help the learners to understand the theoretical and practical aspects of topics such as laws of chemical combination including law of conservation of mass, law of constant proportions.
The step by step explanations of different topics such as What is an Atom? including what are the modern day symbols of atoms of different elements? atomic mass, how do atoms exist? will further help the students to understand some more interesting facts about atoms. The solutions provided for these topics will help the learners to understand fast about these topics. Similarly, as one proceeds further through chapter 3 Atoms and Molecules, an important topic called what is a molecule? including molecules of elements, molecules of compounds, what is an ion? will be taught. These topics have been taught with the help of detailed tables and activities. The solutions given for the questions asked for this topic will make the learner understand more about molecules.
Moving ahead, topics such as writing chemical formulae, formulae of simple compounds would be learnt. The explanatory tables and guided solutions provided for these topics will help the students to learn about the different theories of how evolution must have happened.The solutions provided for the topics such As molecular mass and mole concept, molecular mass, formula unit mass, mole concept will help the students to understand and correlate in a better way. The answers provided for the questions at the end of the chapter further act as a guide and help the learners to understand the concept of the complete chapter.This chapter is a part of Unit I Matter-Its Nature and Behaviour and holds a weightage of 23marks in the final examination of Grade 9 according to the latest pattern.
Get 100 percent accurate NCERT Solutions for Class 9 Science Chapter 3 (Atoms and Molecules) explained by expert Science teachers. We provide solutions for the questions given in Class 9 Science textbook as per CBSE Board guidelines from the latest NCERT book for Class 9 Science. The topics and sub-topics in Chapter 3 Atoms and Molecules are given below.
Ex 3.1 - Laws of Chemical Combination
Ex 3.1.1 - LAW OF CONSERVATION OF MASS
Ex 3.1.2 - LAW OF CONSTANT PROPORTIONS
Ex 3.2 - What is an Atom?
Ex 3.2.1 - WHAT ARE THE MODERN DAY SYMBOLS OF ATOMS OF DIFFERENT ELEMENTS?
Ex 3.2.2 - ATOMIC MASS
Ex 3.2.3 - HOW DO ATOMS EXIST?
Ex 3.3 - What is a Molecule?
Ex 3.3.1 - MOLECULES OF ELEMENTS
Ex 3.3.2 - MOLECULES OF COMPOUNDS
Ex 3.3.3 - WHAT IS AN ION?
Ex 3.4 - Writing Chemical Formulae
Ex 3.4.1 - FORMULAE OF SIMPLE COMPOUNDS
Ex 3.5 - Molecular Mass and Mole Concept
Ex 3.5.1 - MOLECULAR MASS
Ex 3.5.2 - FORMULA UNIT MASS
Ex 3.5.3 - MOLE CONCEPT
We cover all exercises in the chapter given below:-
EXERCISE 3.1 - 4 Questions with Solutions
EXERCISE 3.2 - 2 Questions with Solutions
EXERCISE 3.3 - 4 Questions with Solutions
EXERCISE 3.4 - 2 Questions with Solutions
EXERCISE 3.5 - 2 Questions with Solutions
EXERCISE 3.6 - 11 Questions with Solutions.
Other than given exercises, you should also practice all the solved examples given in the book to clear your concepts on Atoms and Molecules. Download the free PDF of Chapter 3 Atoms and Molecules and take the print out to keep it handy for your exam preparation.