equilibrium - 2024 ACF Fall

Question

For the autoionization of water, a constant named for this state is approximately equal to 10-to-the-minus-14. For 10 points each:

[10e] Identify this state of a reaction with the same forward and backward rates, meaning it exhibits no net change.

ANSWER: equilibrium [accept equilibrium constant]

[10m] The change in this quantity for a reaction can be calculated as minus RT times the natural log of the equilibrium constant. The change in this quantity can also be calculated as delta-H minus T delta-S.

ANSWER: Gibbs free energy [accept change in Gibbs free energy; prompt on G or delta-G or change in free energy]

[10h] This equation can be used to determine the equilibrium constant’s dependence on temperature, as this equation states the derivative of K-eq (“K-e-q”) with respect to temperature equals the standard enthalpy change over R T-squared.

ANSWER: van ‘t Hoff equation

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Summary


2024 ACF Fall at Claremont Colleges	fall	Y	4	22.50	100%	100%	25%
2024 ACF Fall at Cornell	fall	Y	9	13.33	100%	22%	11%
2024 ACF Fall at Rutgers	fall	Y	7	17.14	86%	86%	0%
2024 ACF Fall at Ohio State	fall	Y	8	16.25	88%	75%	0%
2024 ACF Fall at Washington	fall	Y	6	13.33	83%	50%	0%
2024 ACF Fall at Georgia	fall	Y	10	11.00	70%	40%	0%
2024 ACF Fall at North Carolina	fall	Y	9	13.33	89%	44%	0%

Data


Claremont C	UCLA C	10	10	0	20
Claremont A	UCLA B	10	10	0	20
Binghamton A	RIT C	10	0	0	10
Binghamton B	Cornell E	10	0	0	10
UCLA D	UCSD	10	10	10	30
Claremont B	USC	10	10	0	20
RIT A	Cornell B	10	0	0	10
Cornell C	Binghamton C	10	0	0	10
Cornell D	Cornell A	10	10	10	30
ESF	Cornell G	10	10	0	20
U of Rochester A	Syracuse	10	0	0	10
RIT B	U of Rochester B	10	0	0	10
Penn State	Cornell F	10	0	0	10
Columbia A	Bard A	10	10	0	20
Columbia B	Rutgers B	10	10	0	20
Columbia J	Lehigh B	0	0	0	0
Penn A	Lehigh A	10	10	0	20
Maryland A	NYU B	10	10	0	20
NYU A	Rowan A	10	10	0	20
Princeton A	Penn B	10	10	0	20
West Virginia A	Miami C	10	10	0	20
Jefferson County Scholars	Michigan State A	0	0	0	0
Ohio State B	Michigan State B	10	10	0	20
Michigan C	CWRU A	10	0	0	10
CWRU C	CWRU B	10	10	0	20
Michigan B	Ohio State C	10	10	0	20
Michigan A	Michigan D	10	10	0	20
Miami A	West Virginia B	10	10	0	20
Arizona State B	Alberta	10	10	0	20
UW Gluttony	Boise State	10	0	0	10
UW Greed	UW Lust	0	0	0	0
UBC B	UW Pride	10	10	0	20
Arizona State A	UW Sloth	10	10	0	20
UBC A	UW Wrath	10	0	0	10
Alabama A	Vanderbilt A	10	10	0	20
Georgia Tech B	Auburn C	10	0	0	10
Emory Oxford	Emory A	10	10	0	20
Georgia Tech A	Furman	10	10	0	20
Georgia Tech C	Belmont	10	10	0	20
Georgia Tech D	Tennessee A	0	0	0	0
Georgia Tech E	Mississippi State A	10	0	0	10
South Carolina B	Southern	10	0	0	10
Clemson B	Tennessee B	0	0	0	0
Auburn B	Vanderbilt B	0	0	0	0
VCU	Appalachian State B	10	10	0	20
Duke A	UNC B	10	0	0	10
UNC D	James Madison B	10	10	0	20
Liberty A	Virginia Tech A	10	0	0	10
Tusculum	Liberty C	10	10	0	20
NC State	Virginia Tech B	10	10	0	20
UNC A	Duke B	10	0	0	10
Appalachian State A	UNC C	10	0	0	10
William & Mary	Virginia	0	0	0	0