Exam (elaborations)
Chem 104 Final Exam 2024 Questions and answers latest update
- Course
- CHEM 104
- Institution
- Portage Learning
Chem 104 Final Exam 2024 Questions and answers latest update
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Chem 104 Final Exam 2024How many moles of hydroxide ions are there in 25 mL of 0.010M
solution of Ba(OH)2?
a. 7.5 x 10-1 mol
b. 5.0 x 10-1 mol
c. 2.5 x 10-1 mol
d. 5.0 x 10-4 mol
e. 2.5 x 10-4 mol - ANS>d. 5.0 x 10-4 mol
What is the molarity of a solution that contains 46 grams of Na2SO4
(Mw = 142 g/mol) dissolved in enough water to make 750 mL of
solution?
a. 2.3M
b. 0.60M
c. 0.52M
d. 0.43M
e. 0.19M - ANS>d. 0.43M
Imagine that you go into the lab and measure 35 mL of a 0.60M stock
solution. You pour the 35 mL of stock solution into a beaker and dilute
the solution by adding another 35 mL of water. What is the molarity of
the new solution?
a. 1.2M
,b. 0.60M
c. 0.30M
d. 0.15M
e. 0.040M - ANS>c. 0.30M
What is the correct expression for the equilibrium constant, K, for the
following reaction?
P4(s) + 5O2(g) ⇌ P4O10(s) - ANS>K= 1/[O2]^5
If for a certain gas phase reaction mixture Q = 1, what can you say about
the reaction?
a. The reaction will proceed towards the product to achieve
equilibrium.
b. The equilibrium position will be determined by the value of K.
c. The reaction will proceed to the left to achieve equilibrium.
d. The reaction is already at equilibrium.
e. The reaction will go to completion. - ANS>b. The equilibrium position
will be determined by the value of K.
If we increase the volume of the container, then the equilibrium will
_______ and the partial pressure of X2(g) will ____________.
a. Shift to the left, decrease
b. Shift to the left, increase
,c. Shift to the right, decrease
d. Shift to the right, increase
e. Not shift, not change - ANS>a. Shift to the left, decrease
If you decrease the temperature of this reaction the equilibrium will
shift to the________ and the value of K will __________.
a. right, not change
b. right, decrease
c. right, increase
d. left, decrease
e. left, increase - ANS>c. right, increase
Which of the following combinations represent a weak acid and weak
base conjugate pair?
a. HCl and NaCl
b. KH2PO4 and Na3PO4
c. CH3COOH and KCH3COO
d. both choice b and choice c
e. choice a, choice b and choice c - ANS>c. CH3COOH and KCH3COO
What is the pH of 0.050M HClO4?
a. 0.90
b. 1.3
, c. 3.0
d. 7.0
e. 12.7 - ANS>b. 1.3
What is the pH of 0.080M NH3?
a. 1.1
b. 2.9
c. 8.8
d. 11.1
e. 12.9 - ANS>d. 11.1
Which of the following three salts would be basic if dissolved in water?
I. KNO2 II. NH4Cl III. Zn(NO3)2
a. I only
b. II only
c. III only
d. I and II only
e. all three - ANS>a. I only
What is the pH of 0.80M KHCO3?
a. 3.2
b. 5.2
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