Download Circle the electron dot formula most likely to be correct

Chem 121 QU 912 Due in lecture
Name_____________________________________________ page 1/2
DIRECTIONS: Write the correct answers in the appropriate blanks. Round – off problem answers (but not
numbers within a problem) to 3 significant figures. Write units. Text: CHEMISTRY A molecular approach
(2nd Ed.) by Tro.
1. Answer the following from text pages 393-397.
→Draw Lewis Structures in the rectangles for the following:
38a↓
52c↓
Note any ion charges (ions) such as Mg2+.
60d↓
64c↓
2. Answer the following from text pages 447-453.
→Draw the molecular geometry for:
40b↓
40b↓
42b↓
42b↓
__________________
Electron geometry↑
__________________
Molecular geometry↑
_________________
Bond angle↑
→52c
SeF6 is ( polar
__________________
Electron geometry↑
__________________
Molecular geometry↑
_________________
Bond angle↑
Nonpolar ) ←Circle the correct answer.
3. Rank order the following elements (S, F, Rb, O, Sr, Ge) from highest to lowest electronegativity.
→Highest ________
________
________
________
________ ________Lowest
4. Arrange the compounds ( CH4, NaF, SO2, CF4, NaBr, CH3OH ) in order of increasing boiling temperature.
→Lowest ________
________
________
________
________
________ Highest
5. Explain how the Tyndall effect distinguishes a colloid from a solution in the space below:
Chem 121 QU 912 Due in lecture
Name_____________________________________________ page 2/2
6. Answer the next 6 questions concerning FCN.
→______ Write the number of valence electrons.
→ None the possibilities shown have the correct number of electrons. Add extra electrons where appropriate.
:F:C:::N:
:F:N:::C:
:N::C:::F:
:N:F:::C:
Cross out the electron dot formula that cannot possibly be correct.
Write formal charges above F, N, and C in the formulas not crossed out.
FC = valence electrons - 1/2 bonding electrons - lone pair electrons
Circle
the electron dot formula most likely to be correct

π
←Write the most likely correct (circled) line bond
formula in the rectangle. Include lone pair electrons.
← Draw an arrow from π to a pi bond
7. Answer the following from text pages 504-511:
→50c__________________________________
→56a_________________________________________
→________________________________________________________________________________________80
Rewrite the sublimation equation and include the heat term on the proper side↑. Do not use ∆H notation.
→________________________________ Calculate the amount of heat.
8. Answer the next 8 questions using the graph to the right.
30
→Complete the graph to the right: Label the vertical axis
“Pressure (atm)”.
→Write sol (solid), liq (liquid), and gas in the appropriate
areas of the graph.
20
→Circle the triple point.
→Draw a dotted line showing a gas condensing to a liquid and
freezing to a solid at constant pressure. Label this line “GLS”.
Do not include the triple point.
→ __________________ Write the freezing (melting) temperature
(from GLS).
10
0
→Draw a solid line on the graph showing sublimation at constant
pressure. Label this line “SUB”. Do not include the triple point.
→ Pc= __________________
0
10
20 30 40
Temerature(oC)
→Tc = ___________________ Write the critical pressure and temperature.
50
60