The Three States and the Kinetic Molecular Theory: Mechanism
≈ 25 minMechanism
Follow the mechanism step by step and distinguish what causes the change from what is merely observed.
This extension applies that lens specifically to The Three States and the Kinetic Molecular Theory.
The kinetic molecular theory (KMT) explains matter by saying: all matter is made of tiny particles that are always moving, and the amount of movement and spacing decides the state.
| State | Arrangement | Movement | Shape & volume |
|---|---|---|---|
| Solid | packed, ordered, touching | vibrate in place | fixed shape, fixed volume |
| Liquid | close but disordered | slide past each other | takes container's shape, fixed volume |
| Gas | far apart, random | move fast in all directions | fills the container, no fixed volume |
As you heat matter, the particles gain kinetic energy and move more. Enough heat overcomes the forces holding them together, and the substance changes state — solid → liquid → gas.
Chemistry — Grade 10 — Mechanism: In which state are the particles furthest apart and moving fastest?
Chemistry — Grade 10 — Mechanism: A liquid has a fixed volume but takes the shape of its container. Why?
Chemistry — Grade 10 — Mechanism: According to the kinetic molecular theory, what kind of energy do particles gain when a substance is heated? (one word)
Name the original topic being extended by this mechanism lesson.
Which statement is the best evidence-led starting point for The Three States and the Kinetic Molecular Theory: Mechanism?