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CBSE Class 9  >  Class 9 Notes  >  Science   >  Worksheet: Atoms and Molecules

Worksheet: Atoms and Molecules

Q.1. The maximum number of electrons in L shell is
(a) 8 
(b) 18 
(c) 28 
(d) 38

Q.2. Which of the following statements is correct? 
(a) Cathode rays travel in straight line and have momentum.
(b) Cathode rays travel in straight line and have no momentum
(c) Cathode rays do not travel in straight line but have Momentum.
(d) Cathode rays do not travel in straight line and have no momentum.

Q.3. Oxygen is - 
(a) Monovalent
(b) Bivalent
(c) Trivalent
(d) Tetravalent

Q.4. Molecular mass of water (H2O) is
(a) 18g
(b) 8g
(c) 33g
(d) 34g

Q.5. Atomicity of chlorine and Argon is
(a) Diatomic and Monoatomic
(b) Monoatomic and Diatomic
(c) Monoatomic and Monoatomic
(d) Diatomic and Diatomic 

Q.6. Stat the properties of cathode rays?

Q.7. Define the terms:
(a) Atomic number
(b) Mass number 

Q.8. State the law of constant Proportion?

Q.9. Which postulate of Dalton's atomic theory can explain the law of definite proportions? 

Q.10. Which element will be more reactive and why → the element whose atomic number is 10 or the one whose atomic number is 11?

Q.11. What is the mass of 0.2 mole of oxygen atoms?

Q.12. The mass of an atom of element (X) is 2.0 × 10-23 g. Calculate its atomic mass.

Q.13. Calculate the molar mass of Nitric acid.

Q.14. Explain why the number of atoms in one mole of hydrogen gas is double the number of atoms in one mole of helium gas.

Q.15. If the valency of carbon is 4 and that of sulphur is 2, what is the chemical formula and name of the compound formed between carbon and sulphur atoms?

You can access the solutions to this worksheet here.

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FAQs on Worksheet: Atoms and Molecules

1. What are the basic building blocks of matter?
Ans. The basic building blocks of matter are atoms. Atoms are the smallest units of an element and consist of protons, neutrons, and electrons. They combine to form molecules, which make up all substances.
2. How do atoms combine to form molecules?
Ans. Atoms combine to form molecules through chemical bonds. The most common types of bonds are covalent bonds, where atoms share electrons, and ionic bonds, where atoms transfer electrons. These interactions allow atoms to achieve stability and form various compounds.
3. What is the difference between an atom and a molecule?
Ans. An atom is the smallest unit of an element and cannot be broken down into smaller substances without losing its properties. A molecule, on the other hand, is formed when two or more atoms bond together. Molecules can be made up of the same or different types of atoms.
4. What are some common examples of molecules?
Ans. Common examples of molecules include water (H2O), which consists of two hydrogen atoms and one oxygen atom; carbon dioxide (CO2), which has one carbon atom and two oxygen atoms; and oxygen gas (O2), which consists of two oxygen atoms bonded together.
5. Why are atoms and molecules important in chemistry?
Ans. Atoms and molecules are fundamental to chemistry because they are the primary components that make up all matter. Understanding their structure and behavior allows chemists to study chemical reactions, the properties of substances, and the interactions between different materials, leading to advancements in various scientific fields.
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