MH Sp 24 14BL MT practice problems & Answer
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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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Time (sec)
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[RX]
[H30+]
Ln[RX]
0.000
7.000
0.00002344
0.0000001
-10.6610666
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6.400
0.00001954
0.00000039
-10.8430469
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0.00000389
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0.00001756
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4.840
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| 4.780
0.00000685
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-11.8912619
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0.00000566
0.00001778
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210.000
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225.000
4.650
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0.00000061
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-14.30980687
270.000
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0.00000061
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285.000
4.630
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[RX]
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0.000
7.000
0.00002344
0.0000001
-10.6610666
15.000
6.400
0.00001954
0.00000039
-10.8430469
30.000
5.410
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45.000
5.230
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60.000
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0.00000439
0.00001905
-12.33618133
150.000
4.700
0.00000349
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165.000
4.670
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180.000
4.670
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4.660
0.00000157
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-13.3644349
210.000
4.650
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225.000
4.650
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240.000
4.640
0.00000061
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0.0000229
-14.30980687
270.000
4.640
0.00000061
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285.000
4.630
0.00002344
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III I
III 1 I
2
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I 4
5 II II
6 1
III |
MnO, (aq) + 8H*(aq) + 5e → Mn²*(aq) + 4 H,O(1)
Al(s) → Alš*(aq) + 3 e
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Assign oxidation numbers to all metals whether they be elemental, monatomic ion, or in
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.1. Refer to the table of standard reduction potentials.
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FAg + 2 €
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» Fe*(aq)
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Ba(NO,l(aq) + K,SOlaq) Baso(s) + 2 KNOlaq)
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50.
20.
0.46
50.
40.
0.92
3
50.
50.
1.15
4
50.
60.
1.15
50.
80.
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• Question 8
Use the data to identify the limiting reagent for each reaction performed.
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EV Trial 2
b. Baso4
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EV Trial 5
e. KNO3
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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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32,5
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44.9
3
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100.2
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re
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0.706
0.771
6829.54
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3.855
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3
2.118
0.771
6829.54
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0.647
0.407
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1
7.53
15.83
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8.14
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84.86
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97.943
1
0.313
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195.887
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1.322
0.661
4
0.855
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(ug/L)
1,5
LO
5
7
3
10
20
6,24652317
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2,281033905
1,68445587
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12.0
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A patient is to receive: 600.0 mL IV fluid over 8.00 hours. The
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ADD FACTOR
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96.0
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1
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DELETE
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- Time (sec) PH [RX] [H30+] Ln[RX] 0.000 7.000 0.00002344 0.0000001 -10.6610666 15.000 6.400 0.00001954 0.00000039 -10.8430469 30.000 5.410 0.00001955 0.00000389 -10.8425353 45.000 5.230 0.00001756 0.00000588 -10.94988696 60.000 5.070 0.00001493 0.00000851 -11.11213794 75.000 4.920 0.00001142 0.00001202 -11.3801444 90.000 4.840 0.00000899 0.00001445 -11.6193977 105.000 | 4.780 0.00000685 0.00001659 -11.8912619 120.000 4.750 0.00000566 0.00001778 -12.08208666 135.000 4.720 0.00000439 0.00001905 -12.33618133 150.000 4.700 0.00000349 0.00001995 -12.56569882 165.000 4.670 0.00000207 0.00002137 -13.08796195 180.000 4.670 0.00000207 0.00002137 -13.08796195 195.000 4.660 0.00000157 0.00002187 -13.3644349 210.000 4.650 0.00000061 0.00002283 -14.30980687 225.000 4.650 0.00000061 0.00002283 -14.30980687 240.000 4.640 0.00000061 0.0000229 -14.30980687 255.000 4.640 0.00000061 0.0000229 -14.30980687 270.000 4.640 0.00000061 0.0000229 -14.30980687 285.000 4.630 0.00002344 Undefined 300.000 4.630…arrow_forwardTime (sec) pH [RX] [H30+] Ln[RX] 0.000 7.000 0.00002344 0.0000001 -10.6610666 15.000 6.400 0.00001954 0.00000039 -10.8430469 30.000 5.410 0.00001955 0.00000389 -10.8425353 45.000 5.230 0.00001756 0.00000588 -10.94988696 60.000 5.070 0.00001493 0.00000851 -11.11213794 75.000 4.920 0.00001142 0.00001202 -11.3801444 90.000 4.840 0.00000899 0.00001445 -11.6193977 105.000 | 4.780 0.00000685 0.00001659 -11.8912619 120.000 4.750 0.00000566 0.00001778 -12.08208666 135.000 4.720 0.00000439 0.00001905 -12.33618133 150.000 4.700 0.00000349 0.00001995 -12.56569882 165.000 4.670 0.00000207 0.00002137 -13.08796195 180.000 4.670 0.00000207 0.00002137 -13.08796195 195.000 4.660 0.00000157 0.00002187 -13.3644349 210.000 4.650 0.00000061 0.00002283 -14.30980687 225.000 4.650 0.00000061 0.00002283 -14.30980687 240.000 4.640 0.00000061 0.0000229 -14.30980687 255.000 4.640 0.00000061 0.0000229 -14.30980687 270.000 4.640 0.00000061 0.0000229 -14.30980687 285.000 4.630 0.00002344 Undefined 300.000 | 4.630…arrow_forwardPlease step by step solutionsarrow_forward
- Kindly solve question a & barrow_forwardDrowser Time Limit: 0:20:00 Time Left:0:15:19 Glenton Morris: Attempt 1 160 40 3.0 Page 1: 140 - 35 3.0 120 10 25 100 2.0 80 60 Z 10 Page 2: 05- 20 0 2. Time is 10 Timetsk 10 Page 3: Of all the graphs shown above, what plot type is correctly represented? O second order Page 4: O no plot shown is valid 4. 1st order 3rd order OL X (W) FONarrow_forwardCalculate the rate [NO3] production at 0.84 M (No2) and 1.4 (O3)arrow_forward
- We are stuck on 9. We get how Q is 16 and rxn goes left. at eq 2+ x. 2 + x. -2 x We get x= 1. Therefore k = 4. Please help us. Questin 9. See conditions from 8 This is not a graded question as it is a practice question . I am 60 years old and helping my son prepare for the AP exam in a few months. We do questions at the back of the textbook by Zumdahl and Zumdahlarrow_forward4,6,7,8) 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) Submit Assignment Continue Accessibility Privacy Center 2021 McGraw Hill LLC All Rights Reserved. Terms of Use IIarrow_forwardEnzyme activity (Effect of temperature) Research Question How does temperature affect the activity of the enzyme catalase? Hypothesis The higher temperature would increase Catalase activity, leading to a faster reaction. Temp (degrees Trial! 4 5.85 3.06 10 22 Ho Results Time to float disc 65t 4.00 1/29/24 Mini Lab #1 10.49 9.43 Trial a 5.70 2.86 5.26 7.86 11.36 Average 5.775 2.96 4.63 9.175 10.395 Rate Class averagearrow_forward
- Time, s PCH4, bar 0 1.01E+00 0.3559 7.48E-01 0.6817 5.98E-01 1.0074 4.98E-01 1.384 4.26E-01 1.6201 3.73E-01 2.0159 3.31E-01 2.3532 2.98E-01 2.7874 2.71E-01 3.0227 2.48E-01 3.3678 2.29E-01 A student collected the following data in the kinetics of the decomposition of methane at 1000K: Reaction: CH4(g)=> C(s) + H2(g) Build three appropriate Excel graphs and list the trendline equation and R2 for each including coordinates. The order of the reaction is? Justify your answer Report the reaction constant value with unitsarrow_forwardChrome File Edit View History Bookmarks People Tab Window Help 89% Mon 9:33 PM Student Students Homework DUE Monday, April X Madeline Carlo - CHM 112 HW X + A docs.google.com/document/d/10m8ZGoSGXKFFcl4KWhwOLh8bFpbtPAmvTWjJPnj15U4/edit Madeline Carlo - CHM 112 HW DUE Monday April 12, 2021 ☆ D TURN IN Share File Edit View Insert Format Tools Add-ons Help Last edit was 3 days ago 100% В IUA Normal text Arial 11 + Editing 31 1 III I III 1 I 2 3 1 I 4 5 II II 6 1 III | 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. > Dictionary CC Aa ... !! IIarrow_forward10arrow_forward
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