Atomic Foundations of Matter
CBSE · Class 9 · Science
Summary of Atomic Foundations of Matter for CBSE Class 9 Science. Key concepts, important points, and chapter overview.
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Matter obeys two important ideas about mass and composition. Mass is conserved in a chemical reaction, so the total mass of reactants equals the total mass of products. A compound also has fixed elements in a fixed mass ratio, no matter where it comes from or how it is prepared. These ideas led to a
Key Concepts
Matter can neither be created nor
Matter can neither be created nor destroyed in a chemical reaction. The total mass of reactants is equal to the total mass of products. In a closed sy
A compound always contains the same
A compound always contains the same elements in the same fixed ratio by mass, no matter its source. Water always contains hydrogen and oxygen in the m
John Dalton proposed that all matter
John Dalton proposed that all matter is made of tiny atoms, atoms cannot be created or destroyed in chemical reactions, atoms of one element are alike
An atom is the smallest unit
An atom is the smallest unit of an element that takes part in chemical reactions. A molecule is an electrically neutral entity of more than one atom t
A covalent bond is formed when
A covalent bond is formed when atoms share one or more pairs of electrons. Hydrogen molecule has a single covalent bond, oxygen molecule has a double
Learning Objectives
- Understand the Law of Conservation of Mass.
- Understand the Law of Constant Proportions or Definite Proportions.
- Explain the main postulates of Dalton's Atomic Theory.
- Distinguish between atoms, molecules, and ions.
- Differentiate covalent bonding and ionic bonding.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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