GCSE Physics: Particle Model — Quick Burst Practice

Inside GCSE Physics: Particle Model — Quick Burst Practice

calculate density ρ = mass ÷ volume, name the particle arrangement in solids, liquids and gases, recall the changes of state, then work through specific heat E = mcΔθ, specific latent heat E = mL and gas pressure with clean numbers. Fast, self-checking. About 10 minutes.

Learning objectives

• density — the equation ρ = mass ÷ volume with clean values;
• states of matter — naming solids, liquids and gases from the arrangement and movement of their particles;
• changes of state — melting, condensing and the conservation of mass;
• heat and latent heat — specific heat capacity E = mcΔθ and specific latent heat E = mL;
• gas pressure — pressure from particle collisions and the p₁V₁ = p₂V₂ relationship at constant temperature.

Activities in this book

1. Round 1 — Density Blitz

   density = mass ÷ volume, ρ = m/V. Keep units consistent (g with cm³, or kg with m³). Divide the mass by the volume and answer in g/cm³.

2. Round 2 — Name That State

   in a solid, particles are packed in a regular pattern and vibrate in fixed positions; in a liquid they are still close but disordered and can flow; in a gas they are far apart, move quickly and can be compressed.

3. Round 3 — Changes of State

   changes of state are physical changes: no new substance is made and the total mass is conserved. Solid→liquid is melting, liquid→gas is boiling, gas→liquid is condensing, liquid→solid is freezing.

4. Round 4 — Heat & Latent Heat

   E = mcΔθ to warm something up (water c = 4200 J/kg°C, copper c = 385 J/kg°C). E = mL to change its state (latent heat of fusion of ice = 334 000 J/kg). Answers in joules.

5. Round 5 — Gas Pressure

   gas pressure comes from particles colliding with the walls of the container. Heat a fixed-volume gas and the pressure rises. For a fixed mass at constant temperature, p₁V₁ = p₂V₂.

Suggestions for teaching

• Keep it fast. This is a timed-feel recall drill — aim for about 10 minutes and speed, not long working.
• Consistent units. For density, insist on g with cm³ before dividing mass by volume.
• Two heat equations. Use E = mcΔθ only when the temperature changes and E = mL only during a change of state.
• Units matter. Density in g/cm³, energy in joules, pressure in kPa.