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Chemistry, 27.07.2019 03:10 allieballey0727
Organic semiconductors can be used in electrochromic devices to block certairn wavelengths of light, making them useful in applications such as anti-glare switches in car rear-view mirrors. by sketching suitable diagrams of absorption spectra, explain how the electrochromic effect works.
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Chemistry, 22.06.2019 01:20, whrjegt4jrnfdvj
1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.
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Chemistry, 22.06.2019 13:00, jaylanmahone223
6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.
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Organic semiconductors can be used in electrochromic devices to block certairn wavelengths of light,...
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