THERMAL

Question 1

Latent heat

Answer 1

The amount of energy required to change the state of a substance

Question 2

Specific heat capacity (c)

Answer 2

The amount of energy that a given mass of substance (either 1 g or 1 kg) can absorb that produce a 1*c increase in temperature

Question 3

A sealed container contains a mixture of 2 substances, what is the ratio of average kinetic energy

Answer 3

1

Question 4

Should ml ever have a number in front

Answer 4

No

Question 5

What is power lost

Answer 5

Power lost = power given - power absorbed

Question 6

What condition are needed for a real gas to behave as an ideal gas

Answer 6

A real gas approximates to an ideal gas at conditions of low pressure, moderate temperature and low density. Under these conditions the intermolecular forces in the gas are small enough to be ignored.

Question 7

Avogadro constant (NA)

Answer 7

the number of atoms in 12g of 12C

Question 8

boiling

Answer 8

takes place throughout a liquid and always occurs at the same temperature

Question 9

Boyle’s law

Answer 9

at a constant temperature, the pressure of a gas is inversely proportional to its volume

Question 10

Charles’ law

Answer 10

at a constant pressure, the volume of a gas is proportional to its temperature (in K)

Question 11

evaporation

Answer 11

takes place at the surface of a liquid and can happen at all temperatures

Question 12

internal energy

Answer 12

the sum of the total intermolecular potential energy and the total random kinetic energy of the molecules in a substance

Question 13

isothermal

Answer 13

constant temperature

Question 14

molar mass

Answer 14

the mass of one mole of a substance

Question 15

mole (m)

Answer 15

the amount of a substance that contains the same number of atoms or molecules as the number of atoms in 12g of 12C

Question 16

pressure law

Answer 16

at a constant volume, the pressure of a gas is proportional to its temperature (in K)

Question 17

specific latent heat (L)

Answer 17

the amount of energy per unit mass of a substance absorbed or released during a change of phase (with no temperature change)

Question 18

temperature

Answer 18

a measure of the average random kinetic energy of the molecules in a substance

Question 19

thermal capacity (C)

Answer 19

the amount of energy required to raise the temperature of an object by 1K

Question 20

thermal equilibrium

Answer 20

a situation where objects are at the same temperature

Question 21

ideal gas, list 3 ideals and what conditions is a real gas an ideal gas?

Answer 21

1. they undergo perfect elastic collisions between themselves and the walls of their container (no ek lost)
2. have no intermolecular forces between them (the internal energy of an ideal gas is therefore the sum of the kinetic energy of the molecules as ep=0)
3. are random in motion.
4. are spheres

A real gas is an ideal gas at, low pressure, low density and moderate temp (but go with high temp on multi-choice)

Question 22

Pressure law

Answer 22

pressure is proportional to temperature, for a fixed amount of gas at constant volume