Question 1

Which of the following compounds is expected to have the highest melting point based on the ionic bonding model, and why?

Accepted Answer

MgF$$_2$$, because it has small, highly charged ions leading to strong electrostatic attraction.

Question 2

Which of the following molecules is nonpolar, despite containing polar covalent bonds?

Accepted Answer

AsBr$$_5$$

Question 3

A pilot checks for water contamination in aviation fuel before flight. What is the most effective method and why?

Accepted Answer

Drain a little bit of gas from the bottom and look for two layers, because water is denser than gasoline.

Question 4

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

End to end overlap of p orbitals

Question 5

Which of the following elements can expand its valence shell to accommodate more than eight electrons?

Accepted Answer

Br

Question 6

What is the electron geometry and molecular geometry of XeF$$_4$$?

Accepted Answer

eg=octahedral, mg=square planar, nonpolar

Question 7

Which of the following bonds is the strongest?

Accepted Answer

C≡N

Question 8

How many sigma and pi bonds are present in the molecule CH$$_2$$CHCH$$_3$$?

Accepted Answer

9 sigma, 1 pi

Question 9

Which of the following compounds would be expected to have the highest lattice energy?

Accepted Answer

Al$$_2O$_3$$

Question 10

Which molecule or compound below contains a pure covalent bond?

Accepted Answer

Cl$$_2$$

Question 11

What is the hybridization of the central atom in O$$_3$$?

Accepted Answer

sp$$^2$$

Question 12

Which of the following best describes a pi ($$\pi) $$bond?

Accepted Answer

Side by side overlap of p orbitals

Question 13

Which of the following compounds exhibits metallic bonding?

Accepted Answer

Li

Question 14

What is the expected bond angle in a molecule with a trigonal planar shape?

Accepted Answer

$$120^\circ$$

Question 15

Which of the following molecules has a central atom with sp hybridization?

Accepted Answer

C$$_2Cl$_2$$

Question 16

Which of the following bonds is the weakest?

Accepted Answer

C-I

Question 17

Which of the following best describes the bonding in BrCl?

Accepted Answer

Polar covalent bonds with partial negative charges on the Cl atoms.

Question 18

Which of the following compounds would be expected to have the lowest melting point according to the ionic bonding model?

Accepted Answer

CsI

Question 19

Which of the following molecules is polar?

Accepted Answer

PCl$$_4F$$

Question 20

Which of the following best describes the electron geometry and molecular geometry of the underlined carbon in CH$$_3CN$$?

Accepted Answer

eg=linear, mg=linear

General Chemistry Exam & Worksheet Study Guidance

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