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Questions and Answers
What is the main topic of Class 9 Science Chapter 3?
What is the main topic of Class 9 Science Chapter 3?
- Forces and Laws of Motion
- Sound
- Atoms and Molecules (correct)
- Gravitation
What is the role of protons in an atom?
What is the role of protons in an atom?
- Positive charge but no mass
- Positive charge and mass (correct)
- Negative charge and mass
- No charge but mass
What is the significance of Avogadro's law?
What is the significance of Avogadro's law?
- Equal volumes of gases contain equal numbers of molecules under similar conditions of temperature and pressure (correct)
- Equal volumes of liquids contain equal numbers of molecules under similar conditions of temperature and pressure
- Equal volumes of different gases contain equal numbers of molecules under similar conditions of temperature and pressure
- Equal volumes of solids contain equal numbers of molecules under similar conditions of temperature and pressure
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Study Notes
Atomic Structure
- The main topic of Class 9 Science Chapter 3 is Atomic Structure.
Atomic Particles
- Protons are positively charged particles that reside in the nucleus of an atom, contributing to its overall positive charge.
- The number of protons in an atom determines the element of an atom, and each element has a unique number of protons in its atoms.
Gas Laws
- Avogadro's law states that equal volumes of gases at the same temperature and pressure have an equal number of molecules.
- The significance of Avogadro's law lies in its ability to calculate the quantity of gas molecules and understand the behavior of ideal gases.
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