Chem 116 Exam 2 questions with answers
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What is the difference between "completion" for irreversible
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chemical reactions and for reversible chemical reactions? -
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CORRECT ANSWERS ✔✔Reversible: Exists in equilibrium, still has
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reactions present, but products are formed.
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Irreversible: 100% completion, no reactants left to form products.
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What is a system at chemical equilibrium? - CORRECT ANSWERS
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✔✔Where the amounts of reaction and products are constant
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over time; rates of forward and reverse are equal.
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What is the "position" of equilibrium? - CORRECT ANSWERS
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✔✔Describes which way the equilibrium is heavy on (more
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reactants than products would mean it lies on the left)
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What is the law of chemical equilibrium (law of mass action)? -
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CORRECT ANSWERS ✔✔At a given temperature, a chemical
|\ |\ |\ |\ |\ |\ |\ |\
system reaches a particular ratio of reactants and products is
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constant.
Why do the concentrations of the reactants and products do not
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change when a |\ |\
chemical reaction has reached equilibrium? - CORRECT ANSWERS
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✔✔Because the concentration is equal for both the reactants and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
products.
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, Describe chemical equilibrium in terms of the rates of the
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forward and reverse reactions. - CORRECT ANSWERS ✔✔At
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equilibrium, the rate of the forward reaction equals the rate of |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the reverse reaction.
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What information is provided by the value of the equilibrium
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
constant for a |\ |\
chemical reaction? - CORRECT ANSWERS ✔✔If the K is large,
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theres mostly products, if it's small, then theres mostly reactants.
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How do you calculate the value of Kp given the value of Kc (and
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vice versa)? - CORRECT ANSWERS ✔✔Kp= Kc (RT)^(delta n)
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Kc= Kp/(RT)^(delta n)
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How do you calculate reaction quotient, Q, when given
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concentrations or pressures at any given time? - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Q= Reactants/Products |\ |\
Must be in molarity. |\ |\ |\
Describe how the value of the reaction quotient at any moment
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
in time can be used to determine whether or not a reaction is at
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
equilibrium or not? - CORRECT ANSWERS ✔✔Q=K; at equilibrium |\ |\ |\ |\ |\ |\ |\ |\
Q>K; reaction must progress towards the reactants
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Q<K; reaction must progress towards the products
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What are two sets of condition in which a chemical reaction can
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be treated by an irreversible reaction (single arrow)? - CORRECT
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ANSWERS ✔✔1. Product escapes; equilibrium can't be established
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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)
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How do you calculate reaction quotient, Q, when given
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentrations or pressures at any given time? - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Q= Reactants/Products |\ |\
Must be in molarity. |\ |\ |\
Describe how the value of the reaction quotient at any moment
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
in time can be used to determine whether or not a reaction is at
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
equilibrium or not? - CORRECT ANSWERS ✔✔Q=K; at equilibrium |\ |\ |\ |\ |\ |\ |\ |\
Q>K; reaction must progress towards the reactants
|\ |\ |\ |\ |\ |\ |\
Q<K; reaction must progress towards the products
|\ |\ |\ |\ |\ |\
What are two sets of condition in which a chemical reaction can
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
be treated by an irreversible reaction (single arrow)? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔1. Product escapes; equilibrium can't be established
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