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Chemistry Curriculum for Quiz – Level 2

1. Matter: States and Behavior

  • States of Matter:
    • Five States: Solid, Liquid, Gas, Plasma (ionized gas), and Bose-Einstein Condensate.
    • Characteristics: Variations in particle motion, compressibility, shape, and volume.
  • Changes of State:
    • Processes: Sublimation (Solid $\leftrightarrow$ Gas), Deposition, Melting, and Boiling.
    • Latent Heat: Hidden energy required for phase changes (Fusion and Vaporization) without temperature change.
  • Evaporation:
    • A surface phenomenon occurring below boiling point that causes cooling.
    • Factors: Affected by surface area, temperature, humidity, and wind speed.

2. Classification and Separation of Matter

  • Classification:
    • Pure Substances: Elements (Metals, Non-metals) and Compounds.
    • Mixtures: Homogeneous (Solutions) and Heterogeneous (Colloids, Suspensions).
  • Properties of Mixtures:
    • Solutions: Stable, homogeneous mixtures.
    • Colloids: Scatter light (Tyndall effect) but appear homogeneous.
    • Suspensions: Unstable mixtures where particles settle.
  • Separation Techniques:
    • Sublimation: For volatile solids (e.g., camphor).
    • Distillation: For miscible liquids with different boiling points (e.g., acetone/water).
    • Separating Funnel: For immiscible liquids (e.g., oil/water).
    • Centrifugation: Based on density (e.g., cream from milk).
    • Chromatography: For separating solutes like dye colors.

3. Atomic Structure and Principles

  • Foundational Theories & Laws:
    • Dalton’s Theory: Matter is made of indivisible atoms.
    • Laws of Combination: Conservation of Mass (Lavoisier) and Constant Proportions (Proust).
  • Subatomic Particles:
    • Protons: Positive, in nucleus (Goldstein).
    • Electrons: Negative, outside nucleus (Thomson).
    • Neutrons: Neutral, in nucleus (Chadwick).
  • Atomic Models:
    • Thomson: “Christmas pudding” model.
    • Rutherford: Discovered nucleus via alpha scattering; proposed orbiting electrons.
    • Bohr: Proposed discrete energy shells (K, L, M, N) to explain stability.
  • Key Characteristics:
    • Atomic & Mass Number: Proton count vs. total nucleons.
    • Valency & Ions: Combining capacity; formation of cations and anions.
    • Isotopes & Isobars: Variations in mass number (isotopes used in medicine).
    • Mole Concept: Standard unit for measuring the amount linked to the Avogadro constant.