Which of the following combinations will result in a reaction that is only spontaneous at low temperatures?

negative enthalpy change and negative entropy change
negative enthalpy change and positive entropy change
positive enthalpy change and negative entropy change
positive enthalpy change and positive entropy change
question 2(multiple choice worth 4 points)

(07.03 mc)

the freezing of methane is an exothermic change. what best describes the temperature conditions that are likely to make this a spontaneous change?

any temperature, because entropy increases during freezing.
any temperature, because entropy decreases during freezing.
low temperature only, because entropy decreases during freezing.
high temperature only, because entropy increases during freezing.
question 3(multiple choice worth 4 points)

(07.03 lc)

which of the following changes will always be true for a system with increasing entropy?

–δg
–δh
+δg
+δs
question 4(multiple choice worth 4 points)

(07.03 lc)

a glass flask containing 100 milliliters of water is sealed with a rubber stopper and placed on a burner. after a while, gas condenses on the inside surface of the flask near the stopper. what type of system is this an example of?

a closed system, because energy can enter or leave the container, but the water molecules cannot.
an open system, because heat and the water are both being exchanged between the container and the surroundings.
an isolated system, because heat and matter can enter but cannot leave the system.
an isolated system, because energy can enter or leave the system, but matter can only move in one direction.
question 5(multiple choice worth 4 points)

(07.03 mc)

which of the following changes occurs with the greatest increase in entropy?

c(s) + co2(g) → 2co(g)
3fe(s) + 2o2(g) → fe3o4(s)
nh(g) + hcl(g) → nh4cl(s)
3o2(g) + 2kcl(s) → 2kclo3(s)