Thermodynamics

Question 1

If heat is entering the system, is q positive or negative (endothermic
or exothermic)

Answer 1

Q is positive and endothermic

Question 2

If work is being done by the system, is w positive or negative?

Answer 2

w is negative

Question 3

What are the three types of systems ?

Answer 3

Isolated - no contact to the surroundings
Closed - energy (usually heat) can go between systems and surroundings
Open - energy and matter (adding stuff in) can go between them

Question 4

what is Q?

Answer 4

the amount of energy transferred

Question 5

what is exothermic? what’s its sign of q

Answer 5

system releases energy (surroundings gain) q is negative

Question 6

what is endothermic? What’s its sign of q

Answer 6

system gains energy (surroundings lose) q is positive

Question 7

What’s the equation for a CLOSED system

Answer 7

∆E = q - ∆PV

Question 8

what’s the first law of thermodynamics?

Answer 8

The total energy in the universe is constant

Question 8

What’s the equation to find ΔE

Answer 8

ΔE = Q + W

Question 8

what is enthalpy?

Answer 8

sum of internal energy of a system (internal energy, plus
work done on or by)