Posted by Tracy on Monday, March 5, 2012 at 10:28pm.
Consider this system at equilibrium.
A(aq) <-> B(aq) Delta H = +750 kJ/mol ..
What can be said about Q and K immediately after an increase in temperature?
a] Q > K because Q increased..
b] Q>K because K decreased..
c] Q<K because Q decreased..
d] Q<K because K increased..
e] Q=K because neither changed
How will the system respond to the temperature increase?
a] shift to the left
b] shift to the right
c] no change
I said that it would shift to the left for the second part [i think] but for the first part i'm not sure because my notes says that adding temperature would cause the reactant concentrations to increase; thus, equilibrium constant K will decrease.
doesn't that mean that a AND b are both correct..? but there can only be one answer from part 1.. please help me reason!
- Chemistry - Tracy, Monday, March 5, 2012 at 10:32pm
and for the sake of understanding.. can someone tell me what would happen if the reaction was exothermic instead of endothermic?
- Chemistry - DrBob222, Monday, March 5, 2012 at 11:46pm
A + heat ==> B
K or Q = (B)/(A)
I may not have interpreted this correctly because I'm not positive a delta T could make an IMMEDIATE impact; however, if we look at the long term, it MUST shift to the right because it's an endothermic reaction and heat is being added. So in the long term B will go up, A will go down, which means K will get larger. Therefore, in the short term Q is too small so Q < what K will be.
The reasoning is the reverse for an exothermic. reaction.
- Chemistry - Tracy, Tuesday, March 6, 2012 at 5:37am
thank you Dr. Bob!
Answer this Question
More Related Questions
- Chemistry - Which of the following reactions are spontaneous (favorable)? A] 2Mg...
- Chemistry - The following reaction has an equilibrium constant of 0.020 at a ...
- Chemistry!! Help - Consider the following equilibrium: N2O4 <=> 2NO2 You ...
- chemistry - CaCO2--> CaO+CO2 <-- Calculate the pressure of CO2 in an ...
- Chemistry - For the reaction: H2(g) + I2(g) 2HI(g) , Kc = 12.3 at some ...
- Chemistry - Consider the reaction HCHO(g) *) H2(g) + CO(g). 1.0 mol of HCHO, 1.0...
- Chemistry(Please help) - delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol) I...
- chemistry - Consider the balanced equation 2A(g) + 3G(g) „\ 2X(g) + Z(g). To a ...
- biochem - I'm stuck on this question, not sure where to start. can you show ...
- Chemistry - Consider the following equilibrium: H2CO3 (aq) ↔ H2O (l) + CO2...