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Chem 116 Final Exam Questions & Correct Verified Answers| Already Passed
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Chem 116 Final Exam Questions &Correct Verified Answers| Already
Passed
What is a rate-determining step, and how does it affect kinetic calculations?
The rate determining step is the slowest step of a chemical reaction that determines the
speed (rate) at which the overall reaction proceeds.
Assume the elementary steps for this reaction are the following:
Step 1: Slow A+A→C+E
(with a rate constant, k1)
Step 2: Fast E+B→A+D
(with a rate constant, k2)
Step 1 would be the rate determining step
How is a rate law different from an equilibrium constant?
Rate constant is the rate of conversion of reactants into products. It's measured in moles per
sec. Whereas, equilibrium constant is the ratio of concentration of products to concentration
of reactants. It has no unit.
How would you correctly write an equilibrium constant?
The equilibrium constant expression is the ratio of the concentrations of the products over the
reactants.
, What is the definition of an equilibrium?
a state in which opposing forces or influences are balanced.
What is the solubility product? How would you write out an equation for the
solubility product,
and be able to solve for the concentration of the products?
What is Le Châtelier's Principle? How can you use this principle to know which way
an equilibrium will shift under different conditions?
the principle that if a system in chemical equilibrium is subjected to a disturbance it tends
to change in a way that opposes this disturbance. You can use it to see if the concentrations
change which way the reaction is going to want to go to get back to equilibrium.
What is a reaction quotient? How is it different from an equilibrium constant?
What is true at equilibrium about the rates of the forward and reverse reaction?
The rates of the forward the reverse reactions should be equal at equilibrium.
What is the only variable that can change the equilibrium constant of a reaction?
temperature is the only variable that can change the equilibrium constant of a reaction
how to calculate the pH of a solution using ICE tables and acid dissociation constants
solve the ICE box to find the concentrations then plug that value into the pH equation.
How would you solve for pH if given the concentration of an acid or base?
If the acid is a weak acid you would use an ICE box to solve for the concentration at equilibrium
then plug it into the pH equation. If it's a strong acid or base you can plug it in to the equation:
pH=-log(concentration)
What is a titration? What are the various types of titrations?
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