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- What do you think will be formed when Zn is added to aqueous copper(II) chloride?4) In a two-step reaction of [PtCl4]² with NO₂¯followed by NH3, what will be the disposition of the two remaining chlorides in the product (cis or trans?). Explain your answer.6. The quantum yield of a photochemical reaction A to produce B was found to be 0.5. The reaction was made after irradiation of A with light of 365 nm to produce 5 mmol of B. Calculate the total energy absorbed in the reaction. 7. The electronic transition due →* of isolated double bond is appears at shorter wavelength compared with the conjugated one, explain. 8. Photosensitization is an energy transfer between two molecules, explain the difference between excitation with or without photosensitizer and give an example 9. Dye-sensitized solar cells, as well as photodynamic therapy, is an application of photosensitization explain and write the mechanism for both cases. 10. Excimer and exciplex are essential in sensing applications; write two examples with detail of their importance. 11. Photoinduced electron transfer causes fluorescence quenching in a certain chromophore, the fact that inspired researcher for designing chromophore to be used as a fluorescent sensor, explain and give an…
- 1. Write a balanced chemical equation for each of the three possible reactions that could occur when potassium chlorate, KClO3 is thermally decomposed. 2. Your Hypothesis: In this lab, the KClO3 solid will be heated for an extended period of time of high heat without a catalyst like MnO2. Write a clearly formatted hypothesis to your prediction to the outcome of the heated KClO3.1. Explain how you would separate benzoic acid from NaCl in an aqueous solution. Include relevant qualitative test(s) in your explanation. 2. Describe how would you separate naphthalene from the sand. 3. What property of activated charcoal makes it a good decolorizing agent?Consider the following reaction scheme to answer questions (i) to (iii) Q Br Mg Ether Qº 3 00 MgBr 1. LDA 2 1 Br Br i. Product 2 was never obtained from the reaction shown above, provide a brief explanation as to why this reaction didn ii. Give the structure(s) of the compound(s) that will form under these conditions iii. The researchers then decided to change the starting material to the one shown below, and were able to obtain produ 1 2 2 0% yield A
- in the reaction, PrBr with NH3 gives a mixture of products. Why is an excess of NH3 required to give propylamine, PrNH2 as the major product?write the complete reaction mechanism between ethylbromide (using steps and arrows ) and NaOH and determine the type of this reaction?5. Compound 7 can undergo isomerization upon photo or thermo stimulation. NH2 NH2 'N `R N. N. `R trans-7 cis-7 Draw the structure of the dimers formed between the different geometrical isomers of 7 in CHCI3. Also rank the stability of the different dimers with explanation.
- 7. The iron content of an organometallic compound was analyzed by adding nitric acid to a 0.5351-g sample and heating to volatilize the organic material. After ignition, the residue of| ferric oxide was found to weigh 0.2229 g. (a) What is the %w/w Fe in this compound? The carbon and hydrogen in a second sample of the same compound were determined by combustion analysis. When a 0.5567-g sample was carried through the analysis, 1.2119 g of carbon dioxide and 0.2482 g of water were collected. (b) Determine the %w/w C and %w/w H in this compound? (c) Determine the empirical formula of the compound?When you react ammonia with a halogenated alkaline will you get only one organic product? Why or why not?SOLVE THE FOLLOWING CHEMISTRY QUESTIONS. 1. The conversion of oxygen gas to ozone can be catalyzed by the pollutant, nitrogen monoxide gas in the air. Suggest a possible mechanism for this reaction if nitrogen dioxide gas and oxygen free radicals are known to be formed as the intermediate compounds. 2. The reaction between peroxodisulphate (VI) ions, S2O82-and iodide ions, I- can be catalyzed by iron(III) ions, Fe3+. a). Suggest a mechanism for the catalytic reaction. b) Sketch an energy profile diagram for the catalyzed and uncatalyzed reactions. 3. The decomposition of hydrogen peroxide to oxygen and water is an exothermic reaction and is catalyzed by manganese dioxide. Sketch the energy profile for the catalyzed and uncatalyzed decomposition of hydrogen peroxide.