3.1 Temperature and energy change

Question 1

Define internal energy

Answer 1

Internal energy is the total random kinetic energy of the particles of a substance, plus the total inter-particle potential energy of the particles.

Question 2

E=mcΔT

Answer 2

E: energy in J
m: mass, kg
ΔT: temp change, K
c: specific heat capacity (in kJkg^-1K^-1)

Question 3

ΔE=m*L

Answer 3

ΔE: change in energy, J
m: mass, kg
L: latent heat

Question 4

Specific latent heat of fusion

Answer 4

the energy required to change the phase of 1 kg of a substance from solid to liquid without changing the temperature

Question 5

Specific latent heat of vaporization

Answer 5

the energy required to change the phase of 1 kg of a substance from liquid to gas without changing the temperature

Question 6

L=Q/m

Answer 6

L = specific latent heat in Jkg^-1
Q = energy supplied to object to change phase without changing phase in J
m = mass in kg