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WorksheetsFREE ENERGY
Total questions: 10
Worksheet time: 4mins
For which of the following processes would ΔS have a negative value (look at the states s, l, or g) ?
i. 2Fe2O3 (s) → 4Fe(s)+3O2(g)
ii. Mg2+(aq)+2OH-(aq) → Mg(OH)2(s)
iii. H2(g) + C2H4(g) → 3C2H6(g)
I only
I and II only
I and III only
II only
NH3(g) + 2CH4(g) + 5/2 O2(g) → H2NCH2COOH(s) + 3H2O(l)... At constant temp, ΔS is...
increasing
decreasing
staying the same
speeding up
What are the units on ∆S?
J/mol∙K
kJ
J/K
kJ/mol
What do you need to determine whether a reaction is spontaneous or nonspontaneous?
∆S
∆H
T
ALL OF THE ABOVE
What does the symbol S represent?
Entropy
Enthalpy
Gibbs Free Energy
Spontaneous
What does the symbol Δ mean?
Difference
Gibbs
Change in
Spontaneous
What is the equation for Gibbs Free Energy Change?
ΔG = ΔH + TΔS
ΔH = ΔG - TΔS
ΔS = ΔH - TΔG
ΔG = ΔH - TΔS
K are the units for...
Entropy
Temperature
Enthalpy
Gibbs Free Energy
Free energy change at equilibrium is...
Zero
Positive
Negative
A process will be spontaneous when the change in free energy is...
zero
positive
negative
