C125 fina - Study guides, Class notes & Summaries
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CHEM-C125 Final Exam Questions with Latest Update
- Exam (elaborations) • 23 pages • 2024
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In Atomic Spectra lab, Vernier angles (V) in degrees of a Hg-lamp has a linear dependence on wavelength (λ) in nm of line spectra: V = 0.146 λ−10.85 
a) Predict the Vernier angle in degree for a line that has a wavelength of 510 nm. 
b) If a student found a line at a Vernier angle of 76.5°, what is the wavelength in nm of this line? - Answer- a) 63.61 
b) 598.288 
 
Best-fit line equation commonly takes "y=mx+b" format. What are y, x, m and b? - Answer- y = y-value 
x= x-value 
m = slope ...
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C125 Final Questions and Answers
- Exam (elaborations) • 12 pages • 2024
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PCl5 - Answer- All of the following molecules have all bonds being equivalent except: 
SF6 
CH4 
NH3 
PCl5 
 
lone pair to lone pair - Answer- Which of the following has the largest repulsion, assuming that all the angles between electron pairs are identical? 
 
-They are all the same because they all contain the same number of electrons 
-lone pair to lone pair 
- bonding to bonding pair 
-lone pair to bonding pair 
 
square planar - Answer- What is the molecular geometry of XeF4? 
 
none of ...
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C125 Final- Questions and Correct Answers
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The lines observed in H-lamp are parts of Balmer Series. All these lines are due to a transition from various higher n value to a common n. What is this common lower n value for all these lines? - Answer- 2 
 
The bright violet line of Hg lamp has a wavelength of 435.8 nm. What is the energy of the photon associated with this emission line? - Answer- 4.56*10^-19 J 
 
Given: In Atomic Spectra lab, a student obtained his best-fit line equation to be y = 0.29 x + 46.8 when he plotted his Vernier re...
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C125 Final- Correct Answers Latest Update
- Exam (elaborations) • 7 pages • 2024
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Rearrange the following equation to solve for P. 
(P+a)(V-b)=nRT - Answer- P= nRT/V-b -a 
 
What is the y-intercept if B is plotted on y-axis and A is plotted on x-axis? - Answer- -20 
 
Interpolation - Answer- estimating a value within the range of measured data 
 
extrapolation - Answer- projection; conjecture; V. extrapolate: infer (unknown information) from known information 
 
Assume that multiple trials of an experiment were performed. What is the quantity that describes how closely the re...
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C125 Final Questions and Answers
- Exam (elaborations) • 5 pages • 2024
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Rearrange the following equation to solve for V. 
 
(P+a)(V-b)=nRT - Answer- V= (nRT/P+a) +b 
 
In an experiemnt, the best-fit-line equation between Absorbance (A, unitless) and concentration (c, mg/mL) is used to calculate the concentration of Fe. Based on the best-fit line equation given below, what is the concentration of Fe if the absorbance is 1.25? 
 
A = 851 c + 0.03 - Answer- 0.0014 
 
In y=kx + b, b is - Answer- y-intercept 
 
All of the following numbers have three sig figs EXCEPT: 
 1...
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C125 FINAL EXAM QUESTIONS AND ANSWERS
- Exam (elaborations) • 5 pages • 2024
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C125 FINAL EXAM QUESTIONS AND ANSWERS
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CHEM-C125 Final Exam
- Exam (elaborations) • 23 pages • 2023
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In Atomic Spectra lab, Vernier angles (V) in degrees of a Hg-lamp has a linear dependence on wavelength (λ) in nm of line spectra: V = 0.146 λ−10.85 
a) Predict the Vernier angle in degree for a line that has a wavelength of 510 nm. 
b) If a student found a line at a Vernier angle of 76.5°, what is the wavelength in nm of this line? - Answer- a) 63.61 
b) 598.288 
 
Best-fit line equation commonly takes "y=mx+b" format. What are y, x, m and b? - Answer- y = y-value 
x= x-value 
m = slope ...
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C125 FINAL LAB-SIMPLE EXAM QUESTIONS AND ANSWERS
- Exam (elaborations) • 2 pages • 2024
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C125 FINAL LAB-SIMPLE EXAM QUESTIONS AND ANSWERS
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C125 Final Lab Exam Questions with Latest Update
- Exam (elaborations) • 2 pages • 2024
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If you accidentally spilled some dilute HNO3 on the ground, what should you do? - Answer- Use excessive NaHCO3 to neutralize it and then clean it. 
 
Random errors may affect the... - Answer- precision but not the accuracy. 
 
Phenolphthalein is the pH indicator used in Vinegar Analysis lab. Which one of the following solutions may turn pink if a few drops of phenolphthalein is added? - Answer- 10 mL of a 0.20M HCL solution combined with 15 mL of 0.20M NaOH solution 
 
A balance always reads 0.1...
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C125 Final with Answers
- Exam (elaborations) • 12 pages • 2023
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PCl5 - Answer- All of the following molecules have all bonds being equivalent except: 
SF6 
CH4 
NH3 
PCl5 
 
lone pair to lone pair - Answer- Which of the following has the largest repulsion, assuming that all the angles between electron pairs are identical? 
 
-They are all the same because they all contain the same number of electrons 
-lone pair to lone pair 
- bonding to bonding pair 
-lone pair to bonding pair 
 
square planar - Answer- What is the molecular geometry of XeF4? 
 
none of ...
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