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States of Matter | IGCSE Chemistry (0620)

States of Matter | IGCSE Chemistry (0620) | SM-Educate
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CS-991 · Module I-2

1 · States of Matter

Cambridge IGCSE Chemistry 0620 · Core + Supplement · 2026–2028
Quick Revision
▶ Diffusion ▶ Boyle's Law ▶ Charles's Law ▶ General Gas Equation

1.1 Solids, Liquids and Gases Core + Supplement

Key lecture topics planned for this sub-topic:

🎥 Video lectures:
▶ Difference Between Solids, Liquids and Gases ▶ Structures of Solids, Liquids and Gases ▶ Changes of State (Melting, Boiling, Evaporating, Freezing, Condensing) ▶ Heating and Cooling Curves (Kinetic Particle Theory) — Supplement ▶ Effects of Temperature & Pressure on Gas Volume — Supplement
Q1: The particles in a gas, compared to a solid, are:
a) Closer together and vibrating b) Far apart and moving freely c) Fixed in a rigid lattice d) Identical in arrangement
Show Answer
✅ b) Far apart and moving freely
Q2: The change of state from liquid directly to gas below boiling point is called:
a) Melting b) Sublimation c) Evaporation d) Condensation
Show Answer
✅ c) Evaporation
Q3: Increasing pressure on a fixed mass of gas at constant temperature will:
a) Increase its volume b) Decrease its volume c) Have no effect on volume d) Change its mass
Show Answer
✅ b) Decrease its volume

1.2 Diffusion Core + Supplement

Key lecture topics planned for this sub-topic:

🎥 Planned video lectures —
▶ Understanding Diffusion — Kinetic Particle Theory ▶ Relative Molecular Mass and Gas Diffusion — Supplement
Q1: Diffusion is best described as:
a) The movement of particles from low to high concentration b) The movement of particles from high to low concentration until evenly spread c) Particles staying in a fixed position d) The freezing of a liquid
Show Answer
✅ b) The movement of particles from high to low concentration until evenly spread
Q2: A gas with a smaller relative molecular mass will diffuse:
a) Slower than a heavier gas b) Faster than a heavier gas c) At the same rate regardless of mass d) Not at all
Show Answer
✅ b) Faster than a heavier gas
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