Q: Arrange the following molecules in order of increasing strength of intermolecular forces: CH$_4$, CH$_3$CH$_2$CH$_3$, CH$_3$CH$_3$.

CH$_4$ < CH$_3$CH$_3$ < CH$_3$CH$_2$CH$_3$

Question 1

Determine the electron geometry (eg) and molecular geometry (mg) of XeF$_4$.

Accepted Answer

eg = octahedral, mg = square planar

Question 2

Which of the following compounds contains at least one polar covalent bond but is nonpolar overall?

Accepted Answer

CF$_4$

Question 3

Give the hybridization for the carbon atom in HCN.

Accepted Answer

$sp$

Question 4

Consider the molecule below. What is the hybridization of the two labeled carbons?

(Structure: C$_1$ is bonded to three H and one Cl; C$_2$ is bonded to two H, one F, and one C$_1$)

Accepted Answer

C$_1$ = $sp^3$, C$_2$ = $sp^2$

Question 5

Describe a pi bond.

Accepted Answer

side by side overlap of p orbitals

Question 6

Which of the following Lewis structures has a pi bond?

Accepted Answer

H$_2$C=CH$_2$

Question 7

Arrange the following molecules in order of increasing strength of intermolecular forces: CH$_4$, CH$_3$CH$_2$CH$_3$, CH$_3$CH$_3$.

Accepted Answer

CH$_4$ < CH$_3$CH$_3$ < CH$_3$CH$_2$CH$_3$

Question 8

Place the following substances in order of decreasing boiling point: H$_2$O, N$_2$, CO.

Accepted Answer

H$_2$O > CO > N$_2$

Question 9

In liquid propanol, CH$_3$CH$_2$CH$_2$OH, which intermolecular forces are present?

Accepted Answer

Dispersion, hydrogen bonding, and dipole-dipole forces are present.

Question 10

Calculate the atomic mass of gallium if gallium has two naturally occurring isotopes with the following masses and natural abundances:
Ga-69: 68.9256 amu, 60.11%
Ga-71: 70.9247 amu, 39.89%

Accepted Answer

69.723 amu

Question 11

How many moles of potassium are contained in 300 g of potassium?

Accepted Answer

7.67 moles

Question 12

How many iron atoms are contained in 354 g of iron? (Fe molar mass = 55.85 g/mol)

Accepted Answer

$3.82 	imes 10^{24}$ Fe atoms

Question 13

Which of the following contains the MOST atoms? (You shouldn't need to do a calculation here.)

Accepted Answer

10.0 g H

Question 14

What is the molar mass of Pb$_3$(PO$_4$)$_2$?

Accepted Answer

811.6 g/mol

Question 15

How many moles of Au$_2$S$_3$ are in 15.3 g of Au$_2$S$_3$? (Au = 192.967 amu, S = 32.066 amu)

Accepted Answer

0.0200 moles

Question 16

How many sulfur atoms are in 15.3 g of Au$_2$S$_3$?

Accepted Answer

$1.08 	imes 10^{23}$ S atoms

Question 17

What are the missing coefficients to balance the equation below?
NH$_3$(g) + O$_2$(g) $\rightarrow$ N$_2$(g) + H$_2$O(l)

Accepted Answer

4, 3, 2, 6

Question 18

Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

Accepted Answer

Al(C$_2$H$_3$O$_2$)$_3$(aq) + (NH$_4$)$_3$PO$_4$(aq) $\rightarrow$ AlPO$_4$(s) + 3 NH$_4$C$_2$H$_3$O$_2$(aq)

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