4.1 The gaseous state: ideal and real gases and pV = nRT

3 of 3 objectives have lessons · 0 studied · 0 secure

Lessons

Why a gas pushes: pressure from collisionsGas pressure is a hailstorm of tiny molecular hits on the container walls — where it comes from, and why heating or squeezing a gas changes it. 4 min, not started
The ideal gas: two brave assumptionsWhat an ideal gas is — zero particle volume and no intermolecular forces — why the model exists, and when real gases stop playing along. 4 min, not started
pV = nRT: the ideal gas equationThe ideal gas equation with every symbol and unit spelled out, a bulletproof unit routine, and three fully worked calculations. 5 min, not started
Finding Mr from gas dataHow to turn the ideal gas equation into a relative molecular mass — the weigh–measure–calculate routine, worked twice with full steps. 4 min, not started

3 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

4.1.1

Explain the origin of pressure in a gas in terms of collisions between gas molecules and the wall of the container.

Taught in: Why a gas pushes: pressure from collisions · 4 questions

4.1.2

Understand that ideal gases have zero particle volume and no intermolecular forces of attraction.

Taught in: The ideal gas: two brave assumptions · 4 questions

4.1.3

State and use the ideal gas equation pV = nRT in calculations, including in the determination of Mr.

Taught in: Finding Mr from gas data, pV = nRT: the ideal gas equation · 8 questions