Solution 1 0.8- Solution 2 0.6- 0.4- 0.2- 0.0 100 200 300 400 Wavelength (nm) UV-Visible spectroscopy was used to compare the two solutions (1 and 2). The first solution was green, whereas the second was yellow. The same axes were used to capture each solution throughout a variety of wavelengths. Above is an example of the resulting absorbance spectrum. (i). Ten (10) mL of solution 1 were mixed with 10 mL of solution 2 based on the UV-VIS spectrum. Describe the wavelength that should be used to measure the absorbance of solution 1 in this mixture. 1.0- 0.8- 0.6- 0.4- 2 0.2 - 0.0 4 Concentration (mM) Using two sets of standard solutions and blanks, the calibration curves for the two solutions were later obtained. As indicated in the graph above, the absorbances of both solutions were plotted on the same axis. When tested at the suitable wavelength, solution 1 showed a 0.4 absorbance. If solution 1 was chromium (III) sulfate, Cr2(SO4)3 explain the method of getting the concentration of the solution in mg L-1. [Mw Cr2(SO4)3 = 392.2 g mol-1] (iii). Both solutions have a concentration of around 3.5 x 10-3 M in a separate combination. Explain how UV-VIS spectroscopy may be used to reliably detect the concentrations of solution 1 and solution 2. Absorbance Absorbance

'N Brz NaOH N- ●

O 1) C6H5MgBr 2) H₂O 1) LIAIH4 2) H20 OH PBr3 A H H₂SO4 Mg B 1) 03 2) CH3SCH3 HOI mCPBA 1) C6H5CHO 2) H₂O C D E 1) Mg 2) CHz=O 3) H₂O 1) (CH3)2CuLi 2) H₂O F G

H-N=C-N-H 1 Draw the major contributing structure with formal charge(s) below. If there are electrons around any of the atoms ignore them for now. The details will be addressed in the next section. Draw Your Solution Now specify the number of electrons in lone pairs around the specified atoms in the contributing structure that was drawn. The atom labels correspond to the atom labels on the structure in the question. N1 has 2 N2 has C1 and C C3 and C C5 and C H In the contributing structure, the double bonds are placed between: C1 has C2 has C3 has C4 has C5 has C6 has electron(s). electron(s). Now specify the number of electrons in lone pairs around the specified atoms in the contributing structure. The atom labels correspond to the atom labels on the structure in the question. New WP Integrat...pdf electron(s). electron(s) electron(s). electron(s). electron(s). electron(s)

CH 3 CH 3 + Br₂ + HBr CH3 +H2/Pt + KMnO4 + H₂O/H+

NaH MeO i Br [C] THE D E C8H1002 A

NME2 1.) LIAIH (LAH) 2.) H*, H20 b.) HO. NME2 OH NM@2 NH2 2)