Download Exam 2 CHEMISTRY 1A

Exam 6
Ch 21-23
CHEMISTRY 1B
100 Points
Name______________________________
SHOW YOUR WORK FOR FULL CREDIT!!!!
1. Supply the correct name or formula for each compound below and determine
ions per mole of compound in aqueous solution for b and d.
a. [Fe (en)2 I2]2CO3
b. triammine triaqua cobalt(III) sulfate
c. K4[Ni Br2 Cl2 I2]
d. aluminum tetrabromo platinate(II)
2. Draw all the isomers for each of the following and identify each isomer.
a. [Cr(NH3)3Br3]
b. [Pd I2 (NH3)2]
c. [Pt I2 (H2O)2 F2]
the number of moles of
(10)
(10)
3. Construct complete valence bond (molecular orbital) and crystal field diagrams for each ion. Include:
geometry, "d" configuration, hybridization, magnetic properties, spin states, and labels as appropriate.(36)
a. [CoCl4]-2
b. [Fe I6]-3
c. [Pt(CO)4]+2
d. [Os(CN)6]-4
4. Explain and predict the order of ligand strength for:
(CH3)2NH, Br-, CN-, and F-.
(9)
If one octahedral metal ion complex has a yellow color and one a green color, and if these represent the
extremes for this series, which ligand is associated with the yellow complex and which ligand is
associated with the green complex? Explain your answer.
5. Write the balanced equations for the half-reaction occurring at the anode and at the cathode for the
electrolysis of molten AlH3. Also write the balanced net-ionic equation for the process.
(9)
6. Write balanced equations, including physical states, for the following laboratory procedure for the
behavior of barium metal when burned in air.
When burned in air, barium metal produces a mixture of two solids, both binary compounds. The mixture
is treated with water and heated. A strong smell of ammonia is noted. The result is a single pure product
which was one of the original products. There are four equations.
(8)
7. Write the balanced equations for the reaction of aluminum solid with selenium solid, hydrogen gas, and
chlorine gas.
(9)
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8. Given: Al(OH)3, Ksp = 1.2 x 10-32 and Mg(OH)2, Ksp = 9.1 x 10-12
Calculate the equilibrium constant for the reaction between magnesium hydroxide and aluminum ion to
produce magnesium ion and aluminum hydroxide. Write the balanced equation first!! Based on your
result, is it feasible to extract aluminum ion from sea water using this process?
(8)
9. Gallium hydroxide is amphoteric. Write the balanced net-ionic equation for the reaction between this
compound and
(6)
a. sodium hydroxide solution.
b. hydrochloric acid solution.
10. Halogens form polyhalide molecules. Draw the electron dot diagram, sketch the 3-D molecular
structure, give the name for this geometric structure, VSEPR class, and calculate the oxidation number for
each atom:
(12)
a. IF3
b. BrCl5
11. Complete and balance the following nuclear reactions:
a. 104-Rh + 4He  ?
+ 2 1n
b. 238-U + ?  2 1n + 254-Fm
c. (positron emission) 28-P 
d. (alpha emission) 251-Cf 
e. (beta emission) 40-K 
f. (electron capture) 60-Cu 
(18)
12. A Strontium-90 samples loses 75.0% of its activity in 56.0 years. Calculate the half-life of Sr-90. (6)
13. Determine the blood volume of a rabbit from the data below. A 2.8 mL volume of radioactive plasma
with an activity of 5.60x104 dpm is injected into the blood stream. Later, a 1.4 mL sample of blood
plasma is removed and has an activity of 798 dpm.
(10)
14. Cu-64 has a half-life of 12.8 hours. A pure sample of this isotope has an activity of 5.00 x 108dps.
The product has no significant activity. Calculate:
(14)
a. the grams of copper in the original Cu-64 sample.
b. the activity of the sample, in dps, after 3.50 days.
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