Chapter 2, Problem 6RQ

In 1895 a student prepared three coordination compounds of chromium with the same formula CrCl2(H2O). The table below gives the color of each compound along with the number of CI ions in solution per formula unit of the compound. Complete the table by filling in the modern formula for each compound. Metal chromium has a coordination number of 6 in these compounds and an oxidation state of +2. Compound (a) Color Bright blue (b) Light green (c) Yellow Part 1 of 3 Modern formula for (a): х G CI Ions in Solutions per Formula Unit 2 1 0 00 ola

Compound A has molecular formula C7H7X. Its 1H-NMR spectrum shows a singlet at 2.25 ppm and two doublets, one at 7.28 ppm and one at 7.39 ppm. The singlet has an integral of three and the doublets each have an integral of two. The mass spectrum of A shows a peak at m/z = 126 and another peak at m/z = 128; the relative height of the two peaks is 3:1 respectively. Identify what atom X is, explaining your reasoning and identify Compound A, explaining your reasoning.

What is the net charge on the following tripeptides (single-letter abbreviations). * YLV at pH 10.9 (the answer is -1.5 but I don't understand why)

(i) MnO is basic whereas Mn207 is acidic in nature. Why? (ii) Transition metals form alloys. Why? (iii) Complete the following equation: 2MnO4 + 4KOH + O2 ———>

Write the molecular formula for the compound that exhbits a molecular ion at M+ = 84.0574. Assume that C, H, N, and O might be present, and use the exact masses below:

Look up the valence electron configuration, covalent atomic radius, effective nuclear charge, first ionization energy and Pauling electronegativity in Chapter 8 (tables are attached). Examine the above data and answer the following questions. a) Explain why some of the elements like TI and Pb on the lower left of the p block are metallic. b) Explain why some of the elements like C, Si in the center of the p block form covalent bonds. Explain why these bonds formed by the network of these elements (as studied in Chapter 25) tend to be unreactive. c) Explain why the noble Group 8A elements are highly unreactive gases. d) Explain why some elements like F, CI, Br etc, on the upper right of the p block are highly reactive nonmetals.

Here are the SALCS group orbitals of the two F atoms in XeF2. Using the D2h character table, assign the symmetry symbol for the labeled SALCS #3 and #8. #1 #2 ・ O O 800 6 F #3 St 5. #5 #7 8 O #4 #6 2·脚·· · #8 8 F Xe F 8 # 3 is Ag and #8 is B3g O #3 is Blu and #8 is B2g O #3 is Ag and #8 is B2u O#3 is B1g and #8 is B1u # 3 is Blu and #8 is B3g F

How many electrons are in the outer shell of each of the following atoms?

Balance the following (fictional) chemical equations by supplying the correct coefficient. Do not leave any space blank (in other words, write in 1 if you would be leaving it blank): R(OZ)2 - RY2+ Z20 a) ZY+ b) D2 (g) + L2 (g) – DL3 (e)