Thermodynamics

What is the equation for Free energy?

/\G=/\H-T(/\S)

What are changes in enthalpy?

changes in chemical bonding or non covalent interactions

What are changes in entropy?

changes in order or disorder associated with process

What is the ‘system’?

vessel of interest

What are the ‘surroundings’?

place where we record our observations from

What is the difference between open and closed systems?

they both exchange energy with surroundings, open systems exchange matter but closed do not

What is an isolated system?

can not exchange energy or matter with surroundings

What do diathermic barriers do?

allow efficient energy transfer

What do adiabatic barriers do?

prevent transfer even with temp differences.

What is the zeroth law?

if A is in thermal equilibrium with B, and B is in thermal equilibrium with C, they are all in one equilibrium

How do we calculate work?

m x g x h

What does it mean when W is negative?

a system is doing work

What does it mean if Q is negative?

system is heating its surroundings

When does a system do the most work possible?

when the opposing pressure is almost the same as the internal pressure

Which equations re used to find specific heat capacity?

C=q//\T

Q=mc/\T

How do we find internal energy?

w + q

What is the first law of thermodynamics?

isolated systems cant do work on or heat surroundings so internal energy is constant

What is the second law of thermodynamics?

the entropy of an isolated system tends to increase

Why does water have high vaporisation enthalpy?

H bonding