Kinetic Model Flashcards
(17 cards)
What is pressure defined as?
Pressure is defined as force per unit area.
What is the formula to calculate pressure?
pressure = force / area
What are the units for pressure?
Pascal (Pa) or newtons per square metre (Nm-2)
1 Pa = 1 Nm-2
What is caused inside a container when gas particles collide with the walls?
Each collision causes a tiny force on the walls.
True or False: The larger the area, the greater the pressure.
False
What occurs when a person stands on snow with a small area of contact?
The pressure on the snow is great and the person sinks into the snow.
Fill in the blank: The volume of a gas is the amount of space the particles have to move around in. If the walls of the container are brought closer, there will be less time between _______ with the wall.
particle collisions
What is the effect of decreasing the volume of a gas in a bicycle pump?
It leads to less collisions per second, resulting in a decrease in force and pressure.
How does a sharp knife cut vegetables more easily?
A very small area is in contact with the vegetables, creating large pressure.
What is the relationship between force and pressure?
Greater force means greater pressure; larger area means lower pressure.
What prevents a camel from sinking into soft sand in the desert?
Very large feet spread the force of its weight over a large surface area.
How do farm tractors reduce pressure on the soil?
They have very wide tyres to increase the area in contact with the ground.
What happens when heat energy is added to a gas?
It increases both the velocity and the kinetic energy of the particles.
How is gas temperature related to mean kinetic energy?
Gas temperature is proportional to the mean kinetic energy of the particles.
0 k =
-273°C
If the gas temp increases, what happens to the particles and pressure in a fixed volume?
More kinetic energy, hit walls more, more pressure
