solids, liquids and gases

Question 1

What is the SI unit for temperature (both)?

Answer 1

-K and °C

Question 2

What is the SI unit for force?

Answer 2

-N

Question 3

What is the SI unit for density?

Answer 3

-Kg/m3

Question 4

What is the SI unit for pressure?

Answer 4

-Pa

Question 5

What is the SI unit for specific heat capacity?

Answer 5

-J/Kg°C

Question 6

What is the SI unit for mass?

Answer 6

-Kg

Question 7

What is the formula for density?

Answer 7

-density = mass ÷ volume

Question 8

In what direction does pressure act?

Answer 8

-in all directions

Question 9

How do particles in a solid act?

Answer 9

• vibrate around a fixed point
• regular formation
• touching

Question 10

How do particles in a liquid act?

Answer 10

• independently but still touching
• random formation
• flow over each other

Question 11

How do particles in a gas act?

Answer 11

• constant
• rapid and random
• no order

Question 12

How do you determine the volume of a cuboid?

Answer 12

-volume = width x length x height

Question 13

What is the formula for (static) pressure?

Answer 13

-pressure = force ÷ area

Question 14

How do you determine the pressure at different depths in a liquid?

Answer 14

• pressure = height x density x gravitational feild strength

- p = h x ρ x g

Question 15

What is (absolute) temperature?

Answer 15

-absolute temperature is proportional to the average kinetic energy of the particles in a substance

Question 16

What is temperature?

Answer 16

-the measure of the average kinetic energy of particles in a substance

Question 17

What do gases exert on the walls of their container?

Answer 17

-a force

Question 18

Since gases exert a force on the walls of their container they also exert what?

Answer 18

-pressure

Question 19

What happens if you heat up a gas and how does it affect pressure?

Answer 19

• the kinetic energy of the particles increases and so they have more energy
• this means they collide more often and with more force, more force means more pressure

Question 20

What temperature is absolute zero in K and °C?

Answer 20

> 0K

> -273°C

Question 21

30K = ?°C

Answer 21

> -243°C

Question 22

30°C = ?K

Answer 22

> 303K

Question 23

What happens at absolute zero?

Answer 23

-the particles stop moving and there is no pressure (no force)

Question 24

If you double the temperature (Kelvin) what happens to the pressure?

Answer 24

-it also doubles

Question 25

What is the formula involving P1, P2, T1 and T2

Answer 25

P1 x T2 = P2 x T1

Question 26

In the formula: P1 x T2 = P2 x T1

what do P and T stand for?

Answer 26

• P is pressure

- T is temperature (Kelvin)

Question 27

If you have a fixed temperature, what happens when you halve the volume?

Answer 27

• doubles the rate of collision

- doubles the pressure

Question 28

What is the formula involving P1, P2, V1 and V2

Answer 28

P1 x V1 = P2 x V2

Question 29

In the formula: P1 x T2 = P2 x T1

what do P and T stand for?

Answer 29

• P is pressure

- T is volume

Question 30

When heat energy is added to a system, what happens?

Answer 30

-change of state
or
-increase temperature

Question 31

What is specific heat capacity (shc)?

Answer 31

-the energy required to change the temperature of an object by one-degree celsius per kilogram of mass

Question 32

What is the equation for change in thermal energy?

Answer 32

-change in thermal energy = mass x specific heat capacity x change in temperature

Question 33

What is the difference between accuracy and precision?

Answer 33

• imagine a basketball player shooting baskets.
• accuracy, his aim will always take the ball close to or into the basket.
• precision, his aim will always take the ball to the same location which may or may not be close to the basket.