FREE ENERGY

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

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-6

A process will be spontaneous when the change in free energy is...

• zero

• positive

• negative