Chem 104 Exam 7 Actual Test Paper Questions Correct Answers Graded A Plus

CHEM 104 EXAM 7 ACTUAL TEST PAPER QUESTIONS CORRECT ANSWERS GRADED A
PLUS
CHEM 104 Exam 7 Questions and Answers Verified
Solutions Latest Update 2026/2027

Question:
A. The rates of the forward & reverse rxns are equal B. The concentration of the reactants and the
products are constant C. The concentration of the reactants and the products are equal

Answer:
C The reactants and the products concentrations do not need to be the same. What is the equilibrium
constant? -✓✓The rate of equilibrium of concentration of products raised to their stoichiometric
coefficients divided by the concentrations of reactants raised to their stoichiometric coefficients.
What can a high K value represent? [ K > 1 ] -✓✓Products dominant the reaction. Reaction is
favored to the right. What can a low K value represent? [ K < 1 ] -✓✓Reactants dominant the
reaction. Reaction is favored to the left. What can we tell about the chemical reaction just be looking
at the K value? -✓✓The magnitude of the equilibrium constant tells us whether a reaction favors
products or reactants at equilibrium. What can you infer when the K constant is equal to 1?
-✓✓Comparable amounts of products and reactants are present at equilibrium. The equilibrium
constant for the reaction A (g) -> <- B (g) = 10. A reaction mixture initially contains [A] = 1.1 M
and [B] = 0.0 M. Which statement about this reaction is true at equilibrium? A. The equilibrium
reaction mixture contains [A] = 1.0 M and [B] = 0.1 M B. The equilibrium reaction mixture contains
[A] = 0.1 M and [B] = 1.0 M C. The equilibrium reaction mixture contains equal concentrations of
A and B. -✓✓B because K = 10 If you reverse an equilibrium reaction, what do you do to the initial
K value? -✓✓Invert it. If K = 10 K now becomes 1/10 If you multiply the coefficients of an
equilibrium reaction, what do you do to the initial K value? -✓✓Raise the K to the same factor. If
you multiplied by 2 Raise K to the 2 (K^2) If you add two or more reactions to obtain an overall
one, what do you do to the initial K? -✓✓Multiply the corresponding K constants by each other. K1
x K2 In what two ways can you write equilibrium constants? -✓✓Kp and Kc What is a Kc value?
-✓✓Equilibrium constant using concentrations What is a Kp value? -✓✓Equilibrium constant using
partial pressures. What must be true about the phases in the equilibrium reaction, to use a Kp?
-✓✓All must be in gaseous phases. How do Kc and Kp relate? -✓✓Kp = Kc (RT) ^ ∆n If the total
number of moles of gas is the same after the reaction as before than ∆n, what is true about Kp and
Kc? -✓✓Kp = Kc Under what circumstances are Kp and Kc equal for the reaction: aA + bB -><- cC
+ dD (all gases)? A. When a + b = c + d B. When the reaction is reversible C. When the K is small
-✓✓A When writing a equilibrium constant, what phases are present and which do not appear?
-✓✓Gases and aqueous are present Solids and liquids do not appear What do you do if you do not
know all the equilibrium concentrations? -✓✓ICE table What is the reaction quotient (Q)? -✓✓The
reaction quotient is the ratio of the concentrations of the products of a reaction to the concentrations
of the reactants at a particular time NOT at equilibrium. Same as K but you may not be at