C125 Study guides, Class notes & Summaries

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...

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 ...

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...

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...

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...

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...

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 ...

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...

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...

independent variable - Answer- the quantity you vary or control; it is assigned to the abscissa (x-axis) dependent variable - Answer- the quantity you measure in the lab; it is assigned to the ordinate (y-axis) ordinate - Answer- y-axis abscissa - Answer- x-axis slope - Answer- change in y/change in x best-fit line equations - Answer- y=mx+b *m is the slope; b is the y-intercept interpolated results - Answer- lie within the range of measured data extrapolated results - Answe...