CH141f Study Guide - Midterm Guide: Potassium Perchlorate, Chemical Formula, Horse Length
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CH141 – Practice Problems/Practice Final Exam Page 1 of 12
1. What is the SO4
2- concentration of a solution prepared by dissolving 3.00 g of Na2SO4 in 1.00
L of water?
2. What is the hybridization state of the nitrogen atom in the molecule NH3? Explain your
3. Name the following compounds:
a) SiO2 _____________________________________
4. Write the chemical formula for the following compounds:
a) cadmium (II) sulfide ________________________
b) potassium perchlorate ________________________
5. Classify the following compounds as strong, weak, or nonelectrolytes:
a) NaI ___________________________
b) NaC2H3O2 _______________________
c) NH3 ____________________________
d) CaCO3 _____________________________
6. Place the following elements in order of increasing atomic radii: Mg, Na, Rb, Cl.
CH141 – Practice Problems/Practice Final Exam Page 2 of 12
7. What is the oxidation state of the bold element in each compound below?
a) FeCl2 ___________________
b) Na2SO3 ___________________
c) H2O2 ___________________
d) Na3PO4 ___________________
8. Place the following diatomic molecules in order of increasing polarity: CN, CF, O2
9. Draw a plot of pressure vs. moles of gas for an ideal gas (label the axes, including units).
10. Circle the correct answer for each of the following:
a) the lowest electronegativity: F, Cl, P
b) would be most likely to form a stable anion with a –2 charge: Se, Cl, Mg
c) is diamagnetic: F, Fe3+, Na+
13. Like all carbonates, barium carbonate can be decomposed to the metal oxide and CO2.
BaCO3 (s) à BaO (s) + CO2 (g)
If the ΔHrxn of barium carbonate decompostion is 269.3 kJ/mol, how many kJ are required to
decompose 10.0 g of BaCO3?
CH141 – Practice Problems/Practice Final Exam Page 3 of 12
12. Using a molecular orbital (MO) diagram, determine the bond order and magnetic properties
of the following diatomic molecules: CN, CN+, and CN–. A template of the valence MO’s is
given below. Which of the three species is most stable?
13. Draw a Lewis structure for the carbonate ion (CO3
–2). Propose a hybridization and bonding
scheme that explains the geometry and bond order for carbonate.
14. Balance the following redox reaction.
NH3(g) + O2(g) à NO(g) + H2O(g)