Spontaneous?
What is spontaneity?
The ability for a reaction to occur without input.
Write the equation to find ∆S if you're given the S values of the balanced chemical reaction.
*see photo*
What order reaction is this?
Rate = k[A]0
Zero order!
What is the entropy if there are only 12,000 possible microstates?
1.30 x 10-22 J/K
What is ∆?
Delta, indicates change
If ∆S < 0 then the reaction is...
Nonspontaneous
Write the reaction equation that involved entropy and microstates.
S = klnW
What is activation energy?
The energy it takes for a reaction to occur.
Solve for ∆S for the following equation:
CH4 + 2O2 → CO2 + 2H2O (g)
CH4 = 186.3 J/K; O2 = 205.2 J/K
CO2 = 213.8 J/K; H2O = 188.8 J/K
1188.1 J/K
What does S stand for?
Entropy
If ∆G < 0 then the reaction is...
Spontaneous
If you're given ∆Ho and ∆So, what equation do you use to solve for ∆Go?
∆Go = ∆Ho - T∆So
What order reaction is this?
Rate = k[A][B]2
Third order!
Solve for ∆Go if ∆Ho is -73.2 kJ and ∆So is 23.7 J/K.
-80.3 kJ
What does the o mean in ∆Ho?
Standard conditions
2A (s) + 3B (l) + 6C (g) → 4D (g) + 3E (aq)
Based on this reaction, is the reaction spontaneous?
Spontaneous
Write the linear form of the equation for first order reactions.
ln[A]t = -kt + ln[A]0
Write the Arrhenius equation.
k = Ae-Ea/RT
At what temperature would the ∆H be -16. 1 kJ and the ∆S be 21.8 J/K?
739 K
What is G?
Gibbs free energy
If ∆G = 0 then the reaction is...
At equilibrium
If you were given only a half-life, what equation would you use to solve for the rate constant?
t1/2 = ln2/k or k = ln2/t1/2
What equation do you use to solve for the half life of a second order reaction?
t1/2 = 1/k[A]0
What is the half life of a second order reaction if rate constant is 1.6 x 10-8 M-1s-1 and the concentration at t=0 is 0.230 M.
2.5 x 108 s
What is k in the context of reaction rates?
Rate constant