Exam I Sample Exam - Department of Chemistry CHM 1220/1225...

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Department of Chemistry CHM 1220/1225 Exam I – Sample Exam 1. Barium chloride reacts with sulfuric acid to produce a white precipitate of barium sulfate. A volume of 10.0 mL of 4.50 M sulfuric acid solution is needed to react completely with 25.0 mL of barium chloride solution. a. Write the balanced chemical equation. b. What is the concentration of the barium chloride solution? c. How many grams of barium chloride were present in the 25.0 mL sample? 2. a. Calculate the grams of phosgene, COCl 2 produced when 10.0 g Cr 2 O 3 react with 25.0 g of CCl 4 according to the reaction: Cr 2 O 3 + 3 CCl 4 –––> 2 CrCl 3 + 3 COCl 2 b. How many grams of each reactant remain at the end of the reaction? 3. What is the frequency of light with a wavelength of 555 nm? What is the energy of one mole of these photons? 4. What is the wavelength of the electromagnetic radiation involved when an electron in hydrogen undergoes a transition from n = 4 to n = 5? Is the radiation EMITTED or ABSORBED (CIRCLE ONE)?
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This note was uploaded on 02/02/2010 for the course CHM 1220 taught by Professor Barber during the Spring '07 term at Wayne State University.

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Exam I Sample Exam - Department of Chemistry CHM 1220/1225...

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