Chem 116 Exam 2 questions with answers
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What is the difference between "completion" for
|\ |\ |\ |\ |\ |\ |\
irreversible chemical reactions and for reversible |\ |\ |\ |\ |\ |\
chemical reactions? - CORRECT ANSWERS ✔✔Reversible:
|\ |\ |\ |\ |\ |\
Exists in equilibrium, still has reactions present, but
|\ |\ |\ |\ |\ |\ |\ |\
products are formed. |\ |\
Irreversible: 100% completion, no reactants left to form |\ |\ |\ |\ |\ |\ |\ |\
products.
What is a system at chemical equilibrium? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Where the amounts of reaction and |\ |\ |\ |\ |\ |\ |\
products are constant over time; rates of forward and
|\ |\ |\ |\ |\ |\ |\ |\ |\
reverse are equal. |\ |\
What is the "position" of equilibrium? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Describes which way the equilibrium is |\ |\ |\ |\ |\ |\ |\
heavy on (more reactants than products would mean it
|\ |\ |\ |\ |\ |\ |\ |\ |\
lies on the left)
|\ |\ |\
What is the law of chemical equilibrium (law of mass
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
action)? - CORRECT ANSWERS ✔✔At a given temperature,
|\ |\ |\ |\ |\ |\ |\
a chemical system reaches a particular ratio of reactants
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and products is constant.
|\ |\ |\
, Why do the concentrations of the reactants and products
|\ |\ |\ |\ |\ |\ |\ |\ |\
do not change when a
|\ |\ |\ |\
chemical reaction has reached equilibrium? - CORRECT
|\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Because the concentration is equal for both
|\ |\ |\ |\ |\ |\ |\ |\
the reactants and products.
|\ |\ |\
Describe chemical equilibrium in terms of the rates of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
forward and reverse reactions. - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔At equilibrium, the rate of the forward reaction equals
|\ |\ |\ |\ |\ |\ |\ |\ |\
the rate of the reverse reaction.
|\ |\ |\ |\ |\
What information is provided by the value of the
|\ |\ |\ |\ |\ |\ |\ |\ |\
equilibrium constant for a |\ |\ |\
chemical reaction? - CORRECT ANSWERS ✔✔If the K is
|\ |\ |\ |\ |\ |\ |\ |\ |\
large, theres mostly products, if it's small, then theres
|\ |\ |\ |\ |\ |\ |\ |\ |\
mostly reactants. |\
How do you calculate the value of Kp given the value of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Kc (and vice versa)? - CORRECT ANSWERS ✔✔Kp= Kc
|\ |\ |\ |\ |\ |\ |\ |\ |\
(RT)^(delta n) |\
Kc= Kp/(RT)^(delta n)
|\ |\
How do you calculate reaction quotient, Q, when given
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentrations or pressures at any given time? - |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Q= Reactants/Products |\ |\ |\
|\ |\ |\ |\ |\ |\
What is the difference between "completion" for
|\ |\ |\ |\ |\ |\ |\
irreversible chemical reactions and for reversible |\ |\ |\ |\ |\ |\
chemical reactions? - CORRECT ANSWERS ✔✔Reversible:
|\ |\ |\ |\ |\ |\
Exists in equilibrium, still has reactions present, but
|\ |\ |\ |\ |\ |\ |\ |\
products are formed. |\ |\
Irreversible: 100% completion, no reactants left to form |\ |\ |\ |\ |\ |\ |\ |\
products.
What is a system at chemical equilibrium? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Where the amounts of reaction and |\ |\ |\ |\ |\ |\ |\
products are constant over time; rates of forward and
|\ |\ |\ |\ |\ |\ |\ |\ |\
reverse are equal. |\ |\
What is the "position" of equilibrium? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Describes which way the equilibrium is |\ |\ |\ |\ |\ |\ |\
heavy on (more reactants than products would mean it
|\ |\ |\ |\ |\ |\ |\ |\ |\
lies on the left)
|\ |\ |\
What is the law of chemical equilibrium (law of mass
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
action)? - CORRECT ANSWERS ✔✔At a given temperature,
|\ |\ |\ |\ |\ |\ |\
a chemical system reaches a particular ratio of reactants
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and products is constant.
|\ |\ |\
, Why do the concentrations of the reactants and products
|\ |\ |\ |\ |\ |\ |\ |\ |\
do not change when a
|\ |\ |\ |\
chemical reaction has reached equilibrium? - CORRECT
|\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Because the concentration is equal for both
|\ |\ |\ |\ |\ |\ |\ |\
the reactants and products.
|\ |\ |\
Describe chemical equilibrium in terms of the rates of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
forward and reverse reactions. - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔At equilibrium, the rate of the forward reaction equals
|\ |\ |\ |\ |\ |\ |\ |\ |\
the rate of the reverse reaction.
|\ |\ |\ |\ |\
What information is provided by the value of the
|\ |\ |\ |\ |\ |\ |\ |\ |\
equilibrium constant for a |\ |\ |\
chemical reaction? - CORRECT ANSWERS ✔✔If the K is
|\ |\ |\ |\ |\ |\ |\ |\ |\
large, theres mostly products, if it's small, then theres
|\ |\ |\ |\ |\ |\ |\ |\ |\
mostly reactants. |\
How do you calculate the value of Kp given the value of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Kc (and vice versa)? - CORRECT ANSWERS ✔✔Kp= Kc
|\ |\ |\ |\ |\ |\ |\ |\ |\
(RT)^(delta n) |\
Kc= Kp/(RT)^(delta n)
|\ |\
How do you calculate reaction quotient, Q, when given
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentrations or pressures at any given time? - |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Q= Reactants/Products |\ |\ |\
