2) Solids, liquids and gases

Question 1

What is the equation linking density, mass and volume?

Answer 1

density = mass/volume

Question 2

How do you measure volume?

Answer 2

• fill a displacement cannister with water
• slowly submerge the object in the water
• collect the displaced water with a measuring cylinder
• the water collected is the object’s volume

Question 3

What is the equation linking force, pressure and area?

Answer 3

• pressure = force/area

Question 4

What is the equation linking gravitational field strength, density, pressure difference and height?

Answer 4

pressure difference = height by density by gravitational field strength
P = hpg

Question 5

The pressure at a point in a gas or liquid at rest acts _______ in all directions

Answer 5

• equally

Question 6

What is meant by air pressure?

Answer 6

• air molecules collide with each other and the walls of a container
• these molecules apply a force on the walls giving it a pressure

Question 7

Why does the pressure increase when the temperature is increased?

Answer 7

• the molecules have more kinetic energy, thus hit the walls of the container with a greater force, therefore there is a greater pressure

Question 8

Explain Brownian motion

Answer 8

• gas molecules have random motion

- smaller particles bump into the gas molecules which makes them change direction and speed

Question 9

Give an example of how Brownian motion can be demonstrated

Answer 9

• smoke particles

Question 10

What is absolute zero in kelvin and in celcius?

Answer 10

• 0K

- -273°C

Question 11

What is 273K in °C?

Answer 11

• 0°C

Question 12

What is 100°C in K?

Answer 12

373K

Question 13

What is 173K in °C?

Answer 13

• -100°C

Question 14

The Kelvin temperature of a ___ is ____________ to the average _______ energy of its molecule

Answer 14

• gas
• proportional
• kinetic

Question 15

Pressure and ___________ in K are ________ proportional

Answer 15

• temperature

- directly

Question 16

What is the relationship between the pressure and Kelvin temperature of a fixed mass of gas at constant volume?

Answer 16

p1/T1= p2/T2

Question 17

What does absolute 0 mean?

Answer 17

• that the pressure at 0 Kelvin is 0 Pascals

Question 18

As the temperature _________ the pressure increases

Answer 18

• increases

Question 19

If the temperature is constant, what is the relationship between pressure and volume?

Answer 19

p is proportional to 1/V

Question 20

What is the relationship between the pressure and volume of a fixed mass of gass at constant temperature?

Answer 20

“p1V1=p2V2”