ections with no fixed pattern.","points":1,"mcqOptions":[{"text":"Random motion in many directions with no fixed pattern.","correct":true,"explanation":"Gas molecules travel in many different directions and continually change direction after collisions, so their movement is random rather than following a predictable path."},{"text":"Regular motion in one direction with a fixed pattern.","correct":false,"explanation":"Gas molecules do not move together in an orderly direction; collisions continually change their paths. The correct description is random motion in many directions with no fixed pattern."},{"text":"Vibrational motion around fixed positions with no movement between them.","correct":false,"explanation":"This describes particles in a solid, which vibrate around fixed positions. Gas molecules are free to move through the container in random directions."},{"text":"Circular motion around the container with a constant pattern.","correct":false,"explanation":"Gas molecules do not travel in regular circular paths. Their directions change unpredictably during collisions, giving random motion in many directions with no fixed pattern."}]},{"id":"16c801dc-9b0b-48af-bb72-0c15f73f600a","cardType":"basic","front":"Explain how gas molecules exert pressure on a container wall.","back":"

Molecules collide with the walls.
Each collision exerts a tiny force on the wall surface.

","points":2,"mcqOptions":[{"text":"

Molecules collide with the walls.
Each collision exerts a tiny force on the wall surface.

","correct":true,"explanation":"When molecules strike the wall, their momentum changes. This change produces a force on the wall, and the combined forces from many collisions create gas pressure."},{"text":"

Molecules rest against the walls.
Each molecule exerts a tiny mass on the wall surface.

","correct":false,"explanation":"Molecules do not rest against the walls, and mass is not exerted on a surface. Pressure results because collisions produce a force on the wall."},{"text":"

Molecules collide with the walls.
Each collision transfers tiny energy to the wall surface.

","correct":false,"explanation":"Although collisions can transfer energy, pressure specifically comes from the force caused by changing molecular momentum. The second point should refer to a tiny force on the wall."},{"text":"

Molecules avoid the walls.
Each collision exerts a tiny pressure on the wall surface.

","correct":false,"explanation":"Molecules must collide with the walls for pressure to occur, and pressure is force per unit area rather than something exerted by one collision. The correct explanation uses collisions and force."}]},{"id":"cbba6cf3-bbe3-4ff3-8346-73eb6418b354","cardType":"basic","front":"Why does adding more air to a tyre at constant temperature increase the pressure?","back":"

More molecules in the same volume.
More collisions per second with the walls.
Higher total force per unit area.

","points":3,"mcqOptions":[{"text":"

More molecules in the same volume.
More collisions per second with the walls.
Higher total force per unit area.

","correct":true,"explanation":"At constant temperature, the molecules have the same average kinetic energy. Adding molecules increases the collision frequency, raising the total force on each unit area."},{"text":"

More molecules in the same volume.
Fewer collisions per second with the walls.
Lower total force per unit area.

","correct":false,"explanation":"Adding molecules increases, rather than decreases, the number of wall collisions each second. The greater colli

Ideal gas molecules

Ideal gas molecules Flashcards

Ideal gas molecules

Ideal gas molecules Flashcards