Evidence for the particulate nature of matter from diffusion and osmosis, how solids, liquids and gases differ, and how heat energy explains the changes between states.
5 narrated scenes. Press play, listen and read along — the points appear as they are explained. Use ‹ Prev / Next › or the scene bar to jump to any scene.
Open a bottle of perfume at the front of a room and soon everyone smells it. That simple fact is evidence that matter is made of moving particles.
Narration uses your device’s built-in voice. No sound? Switch to “Captions only” — the captions advance on their own.
Watch how the particles move in a solid, a liquid and a gas.
Copy these into your notebook in your own words — that is how they stick.
Movement of particles from high to low concentration; evidence for particles.
Movement of water through a partially permeable membrane from dilute to concentrated solution.
Close, fixed positions, vibrate; strong forces; fixed shape and volume.
Close, slide; fixed volume, no fixed shape.
Far apart, fast, random; no fixed shape or volume; compressible.
Melting, boiling, evaporation, sublimation.
Freezing, condensation.
Flat at the melting and boiling points; pure substances have sharp points.
3 quick games on this lesson. Earn XP and badges as you play — your best score for each game is saved. Games are for practice and do not change your exam readiness. More games in the Chemistry Arcade.
8 items modelled on real CSEC Paper 1 questions. Choose one answer for each, then check. Aim for 80% or better. Work each item on paper first.
Write full answers, then reveal the mark scheme and tick the points you earned (15 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [15 marks]
A student heats a block of ice and records its temperature every minute until the water boils.
(a) (a) State what is meant by diffusion. [2]
(b) (b) Describe an experiment which shows diffusion in a gas. [3]
(c) (c) Describe the arrangement and movement of the particles in solid ice and in steam. [4]
(d) (d) Explain why the temperature stays at 0 °C while the ice is melting. [2]
(e) (e) Name the process by which water vapour changes to liquid water and state whether energy is absorbed or released. [2]
(f) (f) Define osmosis. [2]
Find these in your own past-paper booklets for extra timed practice. Items above are written in the style of these papers; any adapted from a specific question say so.