Question 1.1What is required for a molecule to absorb a photon?(a) The photon's energy must exactly match the molecule'sfrontier MO gap.(b) The photon's energy must be greater than the frontier MOgap.(c) The photon's energy must be less than the frontier MO gap.(d) The photon and the molecule must be the same colour.(e) The photon's energy must exactly match the energydifference between the excited state and the ground state forthe transition of interest.Question 1.2What is a monochromator?(a) A device that spatially focuses all wavelengths to a singlepoint through an exit slit.(b) A lens that converts all wavelengths to a single colour.(c) A device that renders everything in greyscale.(d) A device that spatially separates wavelengths of light anddirects a selected wavelength through to the sample beinganalysed.(e) A device that modulates the intensity of the light passingthrough the sample.Question 1.3How can UV-vis spectroscopy be used to qualitatively identify acompound?(a) Measure the decrease in absorbance over time.(b) Make a calibration curve.(c) Measure the absorbance of a solvent blank.(d) Match the absorbance spectrum of the sample to publisheddata.(e) Compare the UV-vis spectrum of a compound with its NMRspectrum.Question 1.4How can you calculate the concentration of a solution with UV-visspectroscopy if you do NOT know the molar absorptioncoefficient?(a) Add blue dye to the sample and then subtract the blanksample's absorbance.(b) Use Beer's Law by assigning the molar absorptioncoefficient a value of 1 (e = 1).(c) Create a calibration curve which is a plot of absorbance vsconcentration.(d) Calculate the rate constant.(e) Divide the measured absorbance by the product of I´e.Question 1.5Why is it important to wipe the cuvette before every measurement?(a) To make sure that the cuvette will reflect light.(b) To remove fingerprints or contaminants.(c) To cover the transparent sides in fingerprints and dust.(d) To keep the cuvette warm.(e) To charge the cuvette surface electrostatically for themeasurement.

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