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Chem 14BL Spring 2024 Practice Problems for Midterm Midterm – April 30 (Tuesday)- Lecture 1: 8:00 am – 8:50 am in CS 24 Lecture 2: 9:00 am – 9:50 am in CS 24 Exam MUST be taken during the lecture in which you are officially enrolled. DON’T BE LATE – NO EXTRA TIME WILL BE GIVEN IF YOU ARE LATE TO THE EXAM The midterm will include topics such as error analysis, solutions concentrations, Beer’s Law and acid- base titration experiment. Error Analysis 1.
Calculate the percent error for the following quantities: (a)
[(20.54 + 0.02) x (0.254 + 0.003)] / (3.21 + 0.05) (b)
[(30.078 + 0.003) – ( 20.174 + 0.001) + (9.813 + 0.005)] (c)
[(0.642 + 0.002) X (2.413 + 0.004)] – (0.501 + 0.002) (d)
[(12.635 +0.005) / (5.967 + 0.003)] + (0.478 + 0.004) 2.
Calculate the absolute errors for the quantities in question 1. 3.
Calculate the percent relative average deviation for the following set of data. 20.96, 20.85, 20.89, 20.92 Concentration Units 4.
Define the concentration terms molarity, normality, weight percent(w/v%) , ppm 5.
A phosphoric acid (H
3
PO
4
) solution was prepared by transferring 0.0196 g to a 1-L volumetric flask and diluting the solution to the mark. Calculate the concentration of the H
3
PO
4
solution in molarity, normality, ppm, and weight percent (w/v % and w/w % ) (Atomic mass H=1.0000 g/ mol, P = 31.00 g/mol, O = 16.00 g/mol)
Practice Problems (Continued)
6.
A sodium hydroxide solution was prepared by transferring 0.4063g to a 100-mL volumetric flask and diluting the solution to the mark. A 10-mL aliquot of this solution was transferred to a 50-mL volumetric flask and the solution we diluted to the mark. Calculate the concentration of the final sodium hydroxide solution in molarity and w/v% units. (Atomic mass H=1.0000 g/ mol, Na = 23.0000 g/mol, O = 16.0000 g/mol) 7.
A student made a standard solution by transferring 0.0400 g of NaCl into a 50-ml volumetric flask, dissolving the salt and diluting to the mark. She then withdrew 5-ml aliquot with a volumetric pipet and transferred to a 50 ml volumetric flask. The solution was diluted to the mark. Calculate the concentration of the sodium in parts
per million. Assume that 1 ml = 1g. (Atomic mass Na = 23.0000 g/ mol, Cl = 35.4500 g/mol) Beer’s law 8.
(a) Beer’s Law is summarized by the equation: A = e
bc Name and define each of the symbols in this equation. (b)
Calculate the percent transmittance of a solution if its absorbance is 0.352 (9) (a) Calculate the absorbance of the solution if its concentration is 0.0278 M and its molar extinction coefficient is 35.9 L/(mol cm). The depth of the cell is 5 mm. (b) What is the %T? (10) Calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity. (11)
What would happen to the unknown absorbance if you forgot to zero the absorbance with the blank in the aspirin experiment? (12) The following set of data was obtained for the calibration curve for a Beer’s Law experiment. Molarity
(moles/L) Absorbance blank solution 0.0 9.80 x 10-5 0.240 1.96 x 10-4 0.475 3.10 x 10-4 0.741 (a) Without plotting any graph, calculate the slope of the line. (b) Calculate the concentration of a solution of the same compound if its absorbance were 0.500.
Practice Problems (Continued) (13) (a) Calculate the molarity of the standard base solution if a 5.1362 g sample is used to prepare 100 ml in the volumetric flask. (Molecular Weight – 121.13g). (b) Calculate the Molar concentration of an acid solution, if 20.74 ml were required to titrate a 10.00-ml aliquot of the solution prepared in 14. Recrystallization/Aspirin (Review how to calculate the limiting reagent, % yield) (14) What is the purpose of recrystallization? (15) What is the major difficulty when performing recrystallization? (16) Outline the general procedures in recrystallization. (17) Does polarity play a role when picking a solvent for any given product in recrystallization? (18)
(a) Which solvent pairs did we use in recrystallizing the aspirin product? (b) Outline the major steps in using a mixed-solvents technique in recrystallization.
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26) The floor tiles in SE 27 are about 1 square foot and the lab is about 25 tiles wide and about
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.1. Refer to the table of standard reduction potentials.
Standard Reduction Potentials at 25 C
Reduction Half-Reaction
(V)
FAg + 2 €
H2O{aq) + 2 H*(aq)+ 2 6
Mno,taq) + 8 H*(aq) + 5 &
Clalg) + 2 e
CrOFMaq)+ 14 H*(aq) + 6 6-
Ozlg + 4 H*(aq) + 4 &
Bra() + 26
Ag*(aq) + e
Fe*(aq) + e
Ozl9) + 2 H'(aq) + 2 €
2(s)+ 26
Ozlg) + 2 HO) + 46
Cu (aq) + 2 €
Sn" (ag)+ 2 6
2 P(aq)
2 H2O()
→ Mn(aq) + 4 H;0()
→2 cr(aq)
2 Cr (aq)+ 7 H0()
→2 HO()
2 Br(aq)
Ag(s)
» Fe*(aq)
→H;Oz(aq)
→2 F(aq)
→4 OH"(aq)
2.87
1.78
1.51
1.36
1.33
3.
1.23
1.09
0.80
0.77…
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.5.
For a reaction in which E° = -0.100 V and n = 1 mol electrons / mol, calculate AG°. State
+
your assumptions, if any, about temperature.
.6.
For a reaction in which E° = 0.100 V andn = 1 mol electrons / mol, calculate AG° at 25°C.
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MnO, (aq) + 8H*(aq) + 5e → Mn²*(aq) + 4 H,O(1)
Al(s) → Alš*(aq) + 3 e
+
.ЗА.
Assign oxidation numbers to all metals whether they be elemental, monatomic ion, or in
a polyatomic ion, in questions (1) and (2),
.3B. Tell what is being oxidized and what is being reduced in each reaction in questions (1) and
(2).
.3C. Identify each half-reaction in question (2) as oxidation half-reaction or reduction
half-reaction.
.4. Do you need to know the temperature to calculate AG° from E°? Explain.
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4,6,7,8)
Question 19 of 20 (5 points) Question Attempt: 1 of 1
Time Remaining: 30:47
Hannah
10
= 11
= 12
=13
=14
=15
= 16
17
18
19
20
Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit
both sides of the equation to balance it, if you need to.)
do
Note: you are writing the molecular, and not the net ionic equation.
-
CaBr, (aq) + H,O(1)
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Which of the following describes a gradient elution process?
stationary phase has varying concentration
stationary phase has static concentration
mobile phase has varying concentration
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Ba(NO,l(aq) + K,SOlaq) Baso(s) + 2 KNOlaq)
Volume
Volume
Trial 0.10 M Ba(NO)2 (ml)
0.10 M K,SO, (ml)
Mass Baso4 (s)
Limiting Reagent
50.
20.
0.46
50.
40.
0.92
3
50.
50.
1.15
4
50.
60.
1.15
50.
80.
1.15
• Question 8
Use the data to identify the limiting reagent for each reaction performed.
V Trail 1
a. Neither/Both
EV Trial 2
b. Baso4
EV Trial 3
C. KSO4
EV Trial 4
d. Ba(NO3)2
EV Trial 5
e. KNO3
Question Help: Message instructor
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• Question 9
Why is the amount of precipitate in the Data Table above the same in Trials 3 through 5?
Edit Insert Formats B IVX x' A
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The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.
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CHM 431A Lab 7- 2021SP
Given Data page
Time Temperatu
(min)
C1. Boiling temp of water
re
(°C)
25.4
Initial temperature of water
32.5
Temperature of boiling water
44.9
3.
56.9
C2. Temperature change (AT)
4.
71.3
Mass of beaker
5.
86.6
100.2
Mass of beaker and water
7.
100.6
C3. Mass of water
8.
100.6
100.6
1.
2)
6.
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analyte
concentration(C)(mg/ml)
injection volume (ul)
elution time (time)
peak DAD signal(mAU)
caffeine
1
1
4.67
302.85
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5
1
7.53
15.83
benzoic acid
1
1
8.14
89.98
saccharin
1
1
1.91
84.86
mixture(add everything above with 1:1:1:1 ratio)
1
4.47
69.58
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Trial
Conc. A (M)
Conc. B (M)
Rate
1
0.706
0.771
6829.54
2
0.706
3.855
34147.702
3
2.118
0.771
6829.54
4
0.647
0.407
?
Given the information in the table above provide the rate for Trial 4Write all answers in standard form rounded to 3 decimal places "
Order for A
Order for B
Overall Order
The rate for Trial 4
Round to nearest whole number
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Solving moles-to-moles limiting reactant problems
Nitrogen dioxide (NO2) gas and liquid water (H,O)
react to form aqueous nitric acid (HNO,) and nitrogen monoxide (NO)gas. Suppose you have 2.0 mol of
NO, and 5.0 mol of H,O in a reactor.
Calculate the largest amount of HNO, that could be produced. Round your answer to the nearest 0.1 mol.
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H₂N-
F
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Time(min) Concentration
(ug/L)
1,5
LO
5
7
3
10
20
6,24652317
2,807426345
2,281033905
1,68445587
0,947506391
0,386021122
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97.943
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0.313
0.661
0.313
0.626
195.887
783.548
1.322
0.661
4
0.855
0.914
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Round all answers to the nearest whole number"
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10:15 PM Tue Sep 12
12.0
12.0 gtt
ml
A patient is to receive: 600.0 mL IV fluid over 8.00 hours. The
drop factor for the tubing is 12.0 gtt/mL. What is the correct flow rate
setting in drops per min ? (1 drop = 1 gtt)
stt
mL
1 drops
1 att
8.00
ADD FACTOR
x( )
96.0
drop
X
0.833 900
1
1
Question 4 of 5
DELETE
9.60
drops
stt
drop/gtt mL/hr
1.25 600.0 120 0.104 15.0
60
X
gtt/mL
ANSWER
0.0667
mL
RESET
2
1
drop/min
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12.0
54%
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375
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It takes 155 s for an unknown gas to effuse through a porous wall and 97 s for the same volume of N2
gas to effuse at the same temperature and pressure. What is the molar mass of the unknown gas?
g/mol
...
115
MAR
1664
18
ottv A
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a) 21220 J/g
b) 1673 J/g
c)1973 J/g
d)557 J/g
e) 7505 J/g
f) 7073 J/g
g) 300 J/g
h) 657 J/g
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1-arr
In a study of the gas phase decomposition of phosphine at 120 °C
PH3(g)-
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It was found that a graph of In[PH3] versus time in seconds gave a straight line with a slope of -2.50×10² s1 and a y-intercept of -3.24.
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