Study Materials: ncert solutions

Our ncert solutions for Solutions 3. Atoms and Molecules - Additional -Questions | Class 9 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

Solutions ⇒ Class 9th ⇒ Science ⇒ 3. Atoms and Molecules

Solutions 3. Atoms and Molecules - Additional -Questions | Class 9 Science - Toppers Study

Topper Study classes prepares ncert solutions on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Our ncert solutions for Solutions 3. Atoms and Molecules - Additional -Questions | Class 9 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

Solutions 3. Atoms and Molecules - Additional -Questions | Class 9 Science - Toppers Study

CBSE board students who preparing for class 9 ncert solutions maths and Science solved exercise chapter 3. Atoms and Molecules available and this helps in upcoming exams 2023-2024.

You can Find Science solution Class 9 Chapter 3. Atoms and Molecules

All Chapter review quick revision notes for chapter 3. Atoms and Molecules Class 9
NCERT Solutions And Textual questions Answers Class 9 Science
Extra NCERT Book questions Answers Class 9 Science
Importatnt key points with additional Assignment and questions bank solved.

Chapter 3 Science class 9

Additional -Questions class 9 Science Chapter 3. Atoms and Molecules

Sure! The following topics will be covered in this article

Solutions 3. Atoms And Molecules - Additional -Questions | Class 9 Science - Toppers Study
Class 9 Ncert Solutions
Solution Chapter 3. Atoms And Molecules Class 9
Solutions Class 9
Chapter 3. Atoms And Molecules Additional -Questions Class 9

3. Atoms and Molecules

| Additional -Questions |

Solutions 3. Atoms and Molecules - Additional -Questions | Class 9 Science - Toppers Study

Chapter– 3 ATOMS AND MOLECULES

Additional And Important Questions with Solution:

Ques.1 – Who had found two important laws of chemical combination.

Ans. - Antoine L. Lavoisier .

Ques.2 – Write the name of two important laws of chemical combination which is found by Antoine L. Lavoisier.

Ans. – (i) Law of conservation of mass. (ii) Law of constant proportions.

Ques.3 – Write the law of conservation of mass.

Ans. - Mass can neither be created nor destroyed in a chemical reaction.

Ques.4 – Write the law of constant proportions.

Ans. - In a chemical substance the elements are always present in definite proportions by mass.

Ques.5 – Define atoms according to Dalton atomic theory.

Ans. – All matter, whether an element, a compound or a mixture is composed of small particles called atoms.

Ques.6 – Write the Dalton’s atomic theory.

Ans. – Dalton’s atomic theory as follow.

(i) All matter is made of very tiny particles called atoms.

(ii) Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

(iii) Atoms of a given element are identical in mass and chemical properties.

(iv) Atoms of different elements have different masses and chemical properties.

(v) Atoms combine in the ratio of small whole numbers to form compounds.

(vi) The relative number and kinds of atoms are constant in a given compound.

Ques.7 - Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?

Ans. – The second postulate of Dalton’s atomic theory is the result of the law of conservation of mass.

Ques.8 - Which postulate of Dalton’s atomic theory can explain the law of definite proportions?

Ans. – The forth postulate of Dalton’s atomic theory can explain the law of definite proportions.

Ques.9 – Define atomic mass.

Ans. – The sum of numbers of protons and neutrons presence in a nucleus of an atom is known as atomic mass.

Ques.10 – Define atomic number.

Ans. – The number of protons presence in a nucleus of an atom is known as atomic number.

Ques.11 – What is ion?

Ans. – The charged atom is known as ion.

Example – Na ⁺, Mg⁺, Cl^-.

Ques.12 – Write the differences between atom and ion.

Ans –

Atom	Ions
It is neutralized. All the atoms are active insteed of noble gas. It has uncompleted electronic structure in spite of noble gas.	It is charged. All ions are reactive. It has completed electronic structure.

Other Pages of this Chapter: 3. Atoms and Molecules

1. Chapter 3. Atoms and Molecules | Chapter Review

2. Chapter 3. Atoms and Molecules | Text-book Questions

3. Chapter 3. Atoms and Molecules | Additional -Questions

4. Chapter 3. Atoms and Molecules | Additional -Questions 2

5. Chapter 3. Atoms and Molecules | Additional -Questions 3

Select Your CBSE Classes

Important Study materials for classes 06, 07, 08,09,10, 11 and 12. Like CBSE Notes, Notes for Science, Notes for maths, Notes for Social Science, Notes for Accountancy, Notes for Economics, Notes for political Science, Noes for History, Notes For Bussiness Study, Physical Educations, Sample Papers, Test Papers, Mock Test Papers, Support Materials and Books.