C125 Study guides, Class notes & Summaries
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C125 Exam Questions with correct answers 2024
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Aliquot - Answer- - *Portion of measurement added* 
 
- Example: "In this experiment, we will be using an *aliquot* of 10 mL of water for each trial 
 
Sig Fig Rules (Significant) - Answer- - Any non-zero digit is a sig fig 
 
- Zeros between non-zeros are sig figs 
 
- Zeros to the right of the last non-zero digit are sig figs 
 
Sig Fig Rules (Insignificant) - Answer- - Zeros to the left of the first non-zero are NOT sig figs 
 
Calculations Rules for Sig Figs (+/-) - Answer- - Focus on decim...
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C125 Final Lab Exam Questions with Latest Update
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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 Questions and Answers
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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 Midterm Exam Questions with Verified Answers
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Rearrange the Following equation to solve for C: 
 
A = - B/C + D - Answer- C = B / D - A 
 
What is the y-intercept if B is plotted on y-axis and A is plotted on x-axis? 
 
5(A + 12) + 3B = 0 - Answer- -20 
 
In y=kx + b, x is - Answer- independent variable 
 
Masses (in g) and volumes (in mL) of different amounts of unknown liquid were plotted in Excel. What is the physical meaning of the slope of the obtained best-fit-line equation? - Answer- Density 
 
Which one is not rounded correctly whe...
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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 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 Questions and Answers
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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 Midterm Quizzes Questions and Answers
- Exam (elaborations) • 12 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 slope if B is plotted on y-axis and A is plotted on x-axis? 
 
5A + 3B = 8 - Answer- -5/3 
 
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 
 ...
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C125 Midterm Revision Questions and Answers
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rearrange the ideal gas equation, PV=nRT to the form y=mx+b for the case where V is plotted on the y-axis and n on the x-axis. Name the equation, slope,a dn intercept - Answer- V= RT/P (n) 
 
slope: RT/P 
 
intercept: none 
 
Interpolation - Answer- estimating a value within the range of measured data 
 
extrapolation - Answer- projection; conjecture; V. extrapolate: infer (unknown information) from known information 
 
best fit line equation commonly takes y=mx+b format. What are your y, x, and...
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C125- Review- 100% Correct Answers
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accuracy - Answer- how close a measured value is to an accepted value 
 
Precision - Answer- The degree to which repeated measurements show the same result. 
 
precision describes - Answer- random errors and statistical probability 
 
measurement of accuracy - Answer- percent error 
 
Border Ligand (weak) - Answer- H2O 
 
I - Answer- weak ligand 
 
Br - Answer- weak ligand 
 
cl - Answer- weak ligand 
 
CO2 - Answer- weak ligand 
 
F - Answer- weak ligand 
 
CS - Answer- strong ligand 
 
NH4 - A...
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