P6- Matter

Question 1

Equation for density?

Answer 1

density(P) = mass(M) / volume(V)

Question 2

What is the equation for internal energy?

Answer 2

Internal energy = Ke (kinetic energy) + Pe (potential energy)

Question 3

What is the equation for specific latent heat?

Answer 3

E (energy) = M (mass) x L (latent heat)

Question 4

What is the unit for specific latent heat?

Answer 4

J/kg

Question 5

What is Boyles law?

Answer 5

Pressure x Volume = Constant

Question 6

How to transfer degrees Celsius to kelvin

Answer 6

Add 273

Question 7

What is internal energy?

Answer 7

The energy stored within the particles of a substance

Question 8

What do kinetic and potential energy represent?

Answer 8

Kinetic - how much the particles are vibrating

Potential - how spaced out the particles are

Question 9

What is latent heat?

Answer 9

The energy needed to change the state of 1kg m of a substance.

Question 10

What is the method to finding the density of an irregular object?

Answer 10

• measure the objects mass using a mass balance
• fill a measuring cylinder with 200ml of water
• place the object in the measuring cylinder
• measure the new water level and find the difference
• then using the equation ( P = M / V ) calculate the density.

Question 11

What happens to the kinetic and potential energy when changing state?

Answer 11

Kinetic - stays same
Potential - increases

Question 12

For a fixed volume of gas, what happens when the temperature increases?

Answer 12

The pressure will increase as they are directly proportional

Question 13

What does pressure relative to atmosphere mean?

Answer 13

The pressure relative to the 100 kpa atmospheric pressure

Question 14

What does kpa stand for?

Answer 14

Kilo pascals

Question 15

What happens to the pressure if the volume decreases?

Answer 15

It increases as the same number of particles are being forced into a smaller space

Question 16

What happens if a gas is compressed quickly

Answer 16

• the energy is Transferred to the internal energy of the gas
• this increases the temperature of the gas

Question 17

What happens if you compress a gas slowly.

Answer 17

• By compressing the gas slowly, the gas loses energy by heating it surroundings at the same rate as energy is transferred to it
• this means the internal energy store of the gas does not change, and so the temperature stays the same

Question 18

How is pressure proportional to volume?

Answer 18

Pressure is inversely proportional to volume ( as one increases the other decreases) but proportional to 1/volume

Question 19

How does boyles law help you to work out the pressure or volume of a gas?

Answer 19

As V1 x P1 = V2 x P2 if you have Half of the equation you can substitute and work out the missing value.

Question 20

What do you call the energy needed to change a solid to a liquid ?

Answer 20

Latent heat of fusion

Question 21

What do you call the energy needed to change a liquid to a gas?

Answer 21

Latent heat of vaporisation