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Lessons
- Chapter 1 – Matter in our surroundings
- Chapter 2 – Is matter around us pure
- Class 9 chapter 3 – Atoms & Molecules
- Class 9 Chapter 4 – Structure of the Atom
- Class 9 Chapter 5 – The fundamental unit of life
- Class 9 Chapter 6 – Tissues
- Class 9 Chapter 7 – Diversity in living organisms
- Class 9 Chapter 8 – Motion
- Class 9 Chapter 9 – Force and laws of motion
- Class 9 Chapter 10 – Gravitation
- Class 9 Chapter 11 – Work & Energy
- Class 9 Chapter 12 – Sound
- Class 9 Chapter 13 – Why do we fall ill
- Class 9 Chapter 14 – Natural Resources
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Question Bank
- Class 9 Question Bank Chapter 1 – Matter in our surrounding
- Class 9 Question Bank Chapter 2 – Is matter around us pure
- Class 9 Question Bank Chapter 3 – Atoms and molecules
- Class 9 Question Bank Chapter 4 – Structure of the Atom
- Class 9 Question Bank Chapter 5 – The fundamental unit of life
- Class 9 Question Bank Chapter 6 – Tissues
- Class 9 Question Bank Chapter 7 – Diversity in living Organism
- Class 9 Question Bank Chapter 8 – Motion
- Class 9 Question Bank Chapter 9 – Force and laws of Motion
- Class 9 Question Bank Chapter 10 – Gravitation
- Class 9 Question Bank Chapter 11 – Work and energy
- Class 9 Question Bank Chapter 12 – Sound
- Class 9 Question Bank Chapter 13 – Why do we fall ill
- Class 9 Question Bank Chapter 14 – Natural Resources
Chapter 2 – Is matter around us pure
- A mixture contains more than one substance mixed in any proportion.
- A pure substance consists of a single type of particles.
- A solution has a solvent and a solute as its components.
- A Solution is a homogeneous mixture of two or more substances.
- Air is a homogeneous mixture and can be separated into its components.
- Brass is mixture of approximately 30% of zinc and 70% of copper
- By some separation techniques mixtures can be separated into pure substances
- Suspension is a heterogeneous mixture here the particles of a suspension can be seen by the naked eye
- A colloid is also heterogeneous mixture but the size of particles of a colloid is too small to be individually seen by naked eyes
- Collid do not settle down when left undisturbed.
- The concentration of a solution is the amount of solute present in a given amount of solution, or the amount of solute dissolved in a given mass or volume of solvent.
Separating the Components of a Mixture
- SEPARATE COLOURED COMPONENT (DYE) FROM BLUE/ BLACK INK
EVAPORATION
- SEPARATE CREAM FROM MILK BY CENTRIFUGATION
- SEPARATE A MIXTURE OF TWO IMMISCIBLE LIQUIDS
- SEPARATE A MIXTURE OF SALT AND AMMONIUM CHLORIDE
SUBLIMATION
- SEPARATE THE DYE IN BLACK INK BY CHROMATOGRAPHY
This process of separation of components of a mixture is known as chromatography.
- SEPARATE A MIXTURE OF TWO MISCIBLE LIQUIDS
Distillation used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points.
- SEPARATE DIFFERENT GASES FROM AIR
Air is a homogeneous mixture and can be separated into its components by fractional distillation.
- SEPARATE PURE COPPER SULPHATE FROM AN IMPURE SAMPLE
PURIFICATION OF SOLIDS BY CRYSTALLIZATION
PURE SUBSTANCES AND MIXTURES
- Elements or compounds just mix together to form a mixture and no new compound is formed. A mixture has a variable composition
- Elements react to form new compounds. The composition of each new substance is always fixed.
- Elements cannot be broken down into simpler substances.
- Sugar, water, methane and salt are some of the examples of compounds
- Properties of a compound are different from its constituent elements