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Question 1.1 What is required for a molecule to absorb a photon? (a) The photon's energy must exactly match the molecule's frontier MO gap. (b) The photon's energy must be greater than the frontier MO gap. (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 energy difference between the excited state and the ground state for the transition of interest.

Question 1.1 What is required for a molecule to absorb a photon? (a) The photon's energy must exactly match the molecule's frontier MO gap. (b) The photon's energy must be greater than the frontier MO gap. (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 energy difference between the excited state and the ground state for the transition of interest.

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Question 1.1 What is required for a molecule to absorb a photon? (a) The photon's energy must exactly match the molecule's frontier MO gap. (b) The photon's energy must be greater than the frontier MO gap. (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 energy difference between the excited state and the ground state for the transition of interest. Question 1.2 What is a monochromator? (a) A device that spatially focuses all wavelengths to a single point 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 and directs a selected wavelength through to the sample being analysed. (e) A device that modulates the intensity of the light passing through the sample. Question 1.3 How can UV-vis spectroscopy be used to qualitatively identify a compound? (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 published data. (e) Compare the UV-vis spectrum of a compound with its NMR spectrum. Question 1.4 How can you calculate the concentration of a solution with UV-vis spectroscopy if you do NOT know the molar absorption coefficient? (a) Add blue dye to the sample and then subtract the blank sample's absorbance. (b) Use Beer's Law by assigning the molar absorption coefficient a value of 1 (e = 1). (c) Create a calibration curve which is a plot of absorbance vs concentration. (d) Calculate the rate constant. (e) Divide the measured absorbance by the product of I´e. Question 1.5 Why 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 the measurement.
Transcribed Image Text:Question 1.1 What is required for a molecule to absorb a photon? (a) The photon's energy must exactly match the molecule's frontier MO gap. (b) The photon's energy must be greater than the frontier MO gap. (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 energy difference between the excited state and the ground state for the transition of interest. Question 1.2 What is a monochromator? (a) A device that spatially focuses all wavelengths to a single point 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 and directs a selected wavelength through to the sample being analysed. (e) A device that modulates the intensity of the light passing through the sample. Question 1.3 How can UV-vis spectroscopy be used to qualitatively identify a compound? (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 published data. (e) Compare the UV-vis spectrum of a compound with its NMR spectrum. Question 1.4 How can you calculate the concentration of a solution with UV-vis spectroscopy if you do NOT know the molar absorption coefficient? (a) Add blue dye to the sample and then subtract the blank sample's absorbance. (b) Use Beer's Law by assigning the molar absorption coefficient a value of 1 (e = 1). (c) Create a calibration curve which is a plot of absorbance vs concentration. (d) Calculate the rate constant. (e) Divide the measured absorbance by the product of I´e. Question 1.5 Why 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 the measurement.
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