State the 2nd law of thermodynamics

All spontaneous processes occur in a direction that increases the entropy of the universe

delta S_{universe} =

S_{sys} + S_{surr}

delta S_{universe} ( >,

delta S_{universe} > 0

S_{sys} + S_{surr} ( >,

S_{sys} + S_{surr} > 0

In a spontaneous process, what has to happen to delta S_{sys} if delta S_{surr }is negative?

delta S_{sys} must be positive and larger than delta S_{surr }so that delta S_{universe} is greater than 0

Can a process be spontaneous if delta S_{sys} and S_{surr }are both negative?

no because delta S_{universe }would be less than 0

Can a process be spontaneous if delta S_{sys} and S_{surr }are both positive?

yes, because delta S_{universe }would have to be greater than 0

What are the units for entropy?

J/(mol•K)

Does increasing the temperature of a sample yield a positive or negative change in entropy?

positive

Does increasing the size of a container for a sample of gas yield a positive or negative change in entropy?

positive

Does increasing the number of particles in a container for a sample of gas yield a positive or negative change in entropy?

positive

Is condensing a liquid out of a gas a positive or negative change in entropy?

negative

Is melting a solid a positive or negative change in entropy?

positive

Which has a higher entropy, CH_{4} or H_{3}CCH_{3}?

H_{3}CCH_{3}, it has more atoms and a higher molar mass

Is compressing a gas in a syringe a positive or negative change in entropy?

Negative

Is dissolving a solid in a liquid a positive or negative change in entropy?

Positive

Is crystalizing a solid out of a solution a positive or negative change in entropy?

negative

Is cooling a gas to lower its temperature a positive or negative change in entropy?

negative