9.1-9.5 Check

Entropy refers to

• the dispersal of matter or energy in a sample of matter.

• the dispersal of bond types in a sample of matter.

• the dispersal of states of matter.

A 10 mL sample of water in different states of matter is placed in three identical containers. Which option lists the samples in order of DECREASING entropy?

• liquid > gas> ice

• gas > liquid > ice

• ice > liquid > gas

• gas > ice > liquid

A flat line on a heating curve indicates

• in increase in temperature

• a phase change

• a positive change in enthalpy

• a negative change in enthalpy

What is this formula used for?

A liquid changing to a gas will have a ________ entropy value.

• positive

• negative

• neutral

• 0

True or False: Reactions that are thermodynamically favorable will occur at a fast rate.

• True

• False

ΔG describes

Give your answer using 4 sig figs. DO NOT enter units.

A reaction where ΔH is negative and ΔS is positive, will be favored at

• high temperatures

• low temperatures

• all temperatures

• no temperatures

A reaction is at equilibrium when ΔG° is

• less than 0

• greater than 0

• 0

• 1