Chapter 1, Problem 6Q

Which of the following statements is FALSE? a.UV envelopes electronic transitions b.IR uses light with a wavelength of 200-400 nm. c. MRI uses radio waves d. MS involves fragmentation of molecules

Prelab Question #4: Choosing the right cuvette can be an important part of designing a spectroscopic experiment. Carry out an online search to find 3 different materials that a cuvette can be manufactured from. Don't forget to cite your sources, by providing a name/description of the website, the URL and the date accessed. (Wikipedia is not considered a reliable source...)

An HDI of 3 is consistent with this structure. True or False

2AgI + Zn → 2Ag+ + 2I- + Zn+2.

What photochemical reaction involving nitrogen oxides initiates the formation ofphotochemical smog?

Elaborate on the following methods of determining particle size:a) Sieving

Question 13 What is FALSE about the advantages of PET imaging? O It is quantitative as you can quantify the amount of radioactivity in a location after you do the three- dimensional reconstruction. O It has excellent depth penetration PET is very sensitive, they can detect down to nanomolar or picomolar range of imaged region. O It provides more anatomical information compared to CT and MRI imaging

A sample is dissolved in water and analyzed using spectrophotometry. The sample shows an absorbance peak at a wavelength of 486 nm. Which one of the following adjustments would increase the absorption at that wavelength? O Diluting the sample with additional water. O Evaporating some of the water from the sample. Decreasing the path length, b. the light takes through the sample. Re-measuring the absorbance of the blank (water).

Question 22 A solution containing two different fluorescent compounds, Ben and Jerry, were analyzed for their individual concentrations in the mixture. Standards of pure Ben and pure Jerry were prepared at a concentration of 500.0 mM and were run in a UV-Vis Spectrophotometer to determine their absorption properties. Absorbance Wavelength Compound Ben 500 mM Compound Jerry 500 mM 400 nm 0.137 0.136 450 nm 0.312 0.113 500 nm 0.154 0.078 550 nm 0.076 0.079 600 nm 0.227 0.148 650 nm 0.230 0.230 700 nm 0.151 0.357 750 nm 0.157 0.246 800 nm 0.154 0.154 A standard curve of the standards was also prepared to help determine the concentration of each component in the solution. The solution produced an absorbance reading of 0.486 at the Amax of Ben, and 0.463 at the Amax of Jerry. STD CURVE BEN Amax Jerry Amax Jerry Лтax Ben STD CURVE JERRY Aтax Ben CONC (mM) ABS ABS CONC (mM) ABS ABS 100 0.074 0.025 100 0.037 0.074 200 0.148 0.057 200 0.081 0.148 400 0.284 0.103 400 0.164 0.284 800 0.607 0.218…