CBSE 9 Science · U2
Matter - Its Nature and Behaviour
Syllabus-listed 25-mark theory unit covering homogeneous and heterogeneous mixtures, solutions, suspensions, colloids, concentration, separation techniques, solubility graphs, atomic models, shell distribution, symbols, valency, atomic number, mass number, isotopes, isobars, laws of chemical combination, formulae, molecular mass, and formula unit mass.
Test yourself
A focused, distraction-free run through 80 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 2.1
Mixtures, Solutions and Concentration
Homogeneous and heterogeneous mixtures, solutions, colloids, suspensions and concentration expressions.
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Topic 2.2
Separation Techniques and Solubility
Crystallisation, distillation, chromatography, sublimation, centrifugation, loading, sedimentation and solubility graphs.
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Topic 2.3
Atomic Models and Electronic Arrangement
Subatomic particles, Thomson, Rutherford and Bohr models, shells and electronic distributions up to element 18.
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Topic 2.4
Atomic Number, Mass Number and Valency
Calculating protons, neutrons and electrons; ions; isotopes, isobars and valency-based formula reasoning.
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Topic 2.5
Chemical Formulae, Masses and Laws
Law of conservation of mass, law of constant proportion, Dalton's theory, ions, covalent and ionic compounds, molecular mass and formula unit mass.
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