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3) Write the electronic structures for the following elements: Co, S, Br, V, and Cu. (5 points) Explain the valences for each, showing what may happen to the electronic structure in each case. (Co can have valences of +2 and +3; S can have valences of -2, +2, +4, and+6; Br can have valences of -1 and +5; V can have valences of +2, +3, +4, and +5; and Cu can have valences of +1 and +2) 4) Derive the critical value of the radius ratio at which fourfold coordination is possible in a planar structure. As discussed in class this critical ratio is 0.414. (Hint: looking down on the planar structure, let the four large anions just touch the small cation in the center.)
calculate the temperature (in EC) at which the vapor pressure is 760 torr. The vapor pressure of Ethanol is 115 torr at 34.9EC
Calculate the change in pH when 5.00 mL of .100 M HCL is added to 100 mL of a buffer solution
What is the molarity of a sulfuric acid solution if 40.2 mL of this solution is required to titrate 6.50 grams of sodium hydrogen carbonate?
Draw structural formulas for all of the structural isomers of C4H10, C5H12 and C3H7Cl.
A gas occupies 4.04 L at 860 torr and 10C. What volume will it fill if the pressure is changed to 731 torr and the temperature is raised to 43 0C?
The specific heat of ethanol is 2.44j/g times degrees celcius. How many kilojoules of energy are required to heat 50.0 g of ethanol from -20.0 degrees celcius to 68.0?
What is the pH at the half-stoichiometric point (half-way to the endpoint) for the titration of 0.22 M HNO2(aq) with 0.10 M KOH(aq)?
What volume of 0.160 M of Li2S solution is required to completely react with 125 mL of 0.160 M of Co(NO3)2
Alkenes and non conjugated dienes usually have absorption maxima below 200nm. Compounds that have conjugated multiple bonds have maxima at wavelengths longer than 200nm.
Compute the changes in the degree of polymerisation and the rate of the polymerisation caused by raising the temperature of polymerisation of styrene in C6H6, initiated by azobisisobutyronitrile from 60 0C to 70 0C.
Na2SO4 is dissolved in water to make 450.mL of a 0.250 M solution. How many mles of Na2SO4 are needed
Organic Chemistry Lab: Reduction and Spectroscopy, 1. Sketch the NMR spectrum you would expect to observe for the following compounds:
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