1. Which of the following compounds would have the highest boiling point?
(a) CH3CH2CH2CH3
(b) CH3NH2
(c) CH3OH
(d) CH2F2
2. Which of the following alkanes would have the highest boiling point?
3. How are the following compounds related?
(a)
(b)
(c)
(d)
isoelectronic species
isotopes
isomers
These compounds are not related at all...they are totally different.
4. What is the total number of sigma bonds found in the following compound?
(a)
(b)
(c)
(d)
8
10
11
15
5. What is the total number of pi bonds found in the following compound?
(a)
(b)
(c)
(d)
1
2
3
4
6. Which of the following orbital box diagrams represents silicon, which has 14 electrons?
7. Which of the following is the correct electron-dot formula for water?
8. Which of the following is the correct electron-dot formula for carbon dioxide?
9. Which of the bonds, shown by the dash, has the greatest polarity?
(a) H-Cl
(b) H-NH2
(c) H-OH
(d) H-SH
10. What is the formal charge of the oxygen atom of the following compound?
(a)
+3
(b)
+1
(c)
-2
(d)
-3
11. Which of the following molecules contains only one non-bonding pair of valence
electrons?
(a) NH4+
(b) HCN
(c) C2H4
(d) N2
12. The following electron-dot formulas for carbon dioxide both satisfy the octet rule for all
of the atoms. Which of these structures is the better structure and why is this the case?
(a)
(b)
(c)
(d)
"A" is the better structure because there is no formal charge on any of the atoms.
"A" is the better structure because all the bonds and non-bonding electron pairs are
arranged in a symmetrical pattern.
"B" is the better structure because there are opposite formal charges on the two
oxygen atoms which attract each other and give the molecule a lower energy.
"B" is the better structure because the bond energies of a single bond and a triple
bond are higher than the bond energies of two double bonds.
13. Which of the following gases would be most soluble in water?
(a) N2
(b) NH3
(c) CH4
(d) CO2
14. Which of the following compounds should have the highest boiling point?
(a) PH3
(b) CH4
(c) H2O
(d) HCl
15. Which of the following compounds is the strongest Brønsted base?
(a) CH4
(b) NH3
(c) H2O
(d) HF
16. What is the major product obtained from the following reaction?
17. Which of the following compounds is the strongest Brønsted base?
(a) HPO42(b) HSO4(c) NO3(d) CH3COO18. The pH of a 1 molar solution of a weak acid with a Ka = 10-10 will be...
(a)
2.5
(b)
5
(c)
10
(d)
Yikes! This question is lowering the pH of my stomach.
19. What is the oxidation number of chromium in the ionic compound Na2Cr2O7?
(a)
2
(b)
6
(c)
7
(d)
12
20. Which Brønsted acid (H2O or H2S (aq)) is the stronger acid and why is it the stronger
acid?
H2O is the stronger acid because oxygen has a greater electronegativity than sulfur,
(a)
which gives the attached hydrogen atom more proton character.
(b) H2O is the stronger acid because H2S is a gas and gases are not acids.
H2S is the stronger acid because the hydrogen-sulfur bond is much weaker than the
(c)
hydrogen-oxygen bond due to a greater difference in atomic orbital energy levels.
H2S is the stronger acid because it is a heavier molecule and therefore has more
(d)
energetic collisions.
21. Which Brønsted acid (HCl (aq) or H2S (aq)) is the stronger acid and why is it the stronger
acid?
(a) HCl is the stronger acid because it is a better proton donor.
HCl is the stronger acid because the hydrogen-chlorine bond is much weaker than the
(b)
hydrogen-sulfur bond due to a greater difference in atomic orbital energy levels.
HCl is the stronger acid because chlorine has a greater electronegativity than sulfur,
(c)
which gives the attached hydrogen atom more proton character.
H2S is twice as strong an acid as HCl because it has two acidic hydrogen atoms
(d)
versus only one hydrogen atom in HCl.
22. What is the oxidation number of nitrogen in the molecule N2?
(a) 0
(b) 3
(c) 5
(d) 7
23. Which of the following compounds is the strongest Brønsted acid?
(a) H2SO4
(b) CH3CO2H
(c) HNO3
(d) H3PO4
24. Which of the following compounds is the strongest Brønsted base?
(a) NaHSO4
(b) NaCH3CO2
(c) NaNO3
(d) NaH2PO4
25. Which of the following compounds is the strongest Brønsted base?
(a) NaCH3
(b) NaOH
(c) NaF
(d) NaNH2