Thermal 1

Question 1

Define specific heat capacity

Answer 1

the energy needed to raise the the temperature of 1kg of a substance by 1K

Question 2

Define internal energy

Answer 2

the sum of all the molecular kinetic energy and potential energy of a substance

Question 3

What is the first law of thermodynamics?

Answer 3

Q = ΔU + W

Q = heat energy in (positive)

ΔU = increase in internal energy (increase in temperature) (positive)

W = work done by the system (positive)

Question 4

What does work done equal? (thermal)

Answer 4

W = pΔV

p = constant pressure

V = volume

Question 5

If gas gives heat energy to the surroundings, then Q is?

Answer 5

negative

Question 6

If gas takes heat energy from the surroundings, then Q is?

Answer 6

positive

Question 7

What is the lowest possible temperature?

Answer 7

absolute zero

Question 8

What do the molecules of a substance have at absolute zero?

Answer 8

zero kinetic energy

Question 9

What is the pressure at absolute zero?

Answer 9

0