CBSE Class 9 Science Chapter-3 Important Questions - Free PDF Download
Important Questions for CBSE Class 9 Science Atoms and Molecules 2024-25
FAQs on Important Questions for CBSE Class 9 Science Atoms and Molecules 2024-25
1. What is an atom according to CBSE Chapter 3 of Class 9 Science?
Atoms may be defined as the most important element that forms the basic unit of things. It is present everywhere. It is the most important structure and it cannot be broken further. Our body is also made of atoms. Students of Class 9 can study atoms in detail through NCERT book. They should read NCERT Chapter 3 carefully to understand the concept of atoms. They can also refer to the Important Questions For CBSE Class 9 Science Atoms And Molecules provided by Vedantu to learn more about atoms.
2. What are chemical reactions according to CBSE Chapter 3 of Class 9 Science?
A chemical reaction is defined as a reaction between two or more substances to form a new substance. A chemical change occurs in the substances that react with each other during a chemical reaction. The change is visible in the form of change in colour, production of heat, or precipitation.
3. What is given in the law of proportions in Chapter 3 of Class 9 Science?
According to the law of proportions given in Chapter 3 of Class 9 Science, a pure chemical compound consists of the same number of elements that are combined in a fixed proportion by mass. For example, if you take out water from your fridge or a lake, it will consist of the same number of hydrogen and oxygen atoms by mass. The number of hydrogen and oxygen atoms that combine to form water remains the same in all forms of water.
4. What are the important topics covered in Chapter 3 of Class 9 Science?
In Class 9 Science Chapter 3, students will study the definitions of atoms, molecules, chemical reactions, chemical formulas, etc. Students will also study different theories related to the discovery of an atom. They will also study how to write a chemical formula for a given compound. Students will also study the law of constant proportion and other laws related to chemical reactions. Mole concept and molecule mass are also important parts of Chapter 3 of Class 9 Science.
5. Are numerical problems given in Chapter 3 of Class 9 Science important for exams?
Yes, numerical problems given in Chapter 3 of Class 9 Science are important for students. They should practice all numerical given in Chapter 3 of Class 9 Science for scoring good marks in exams. They can practice the numerical questions from the NCERT book. They can also refer to the Important Questions For CBSE Class 9 Science Atoms And Molecules provided by Vedantu to understand the concepts for solving numerical problems.