Question 1

Which of the following best explains why atoms form chemical bonds?

Accepted Answer

To lower the potential energy between the charged particles that compose atoms.

Question 2

Which of the following pairs of atoms will form a bond with the greatest ionic character?

Accepted Answer

Sr and F

Question 3

Given the electronegativities: $$\mathrm{H} = 2.1$$, $$\mathrm{F} = 4.0$$, what is the bond type in HF?

Accepted Answer

Polar covalent

Question 4

Which of the following statements about resonance structures is TRUE?

Accepted Answer

Resonance structures must have the same number of electrons.

Question 5

What is the formal charge on nitrogen in the Lewis structure of $$\mathrm{NH}_4^+$$?

Accepted Answer

$$0$$

Question 6

Which molecule below is expected to be a free radical?

Accepted Answer

NO

Question 7

Which of the following molecules can have an expanded octet?

Accepted Answer

SF$$_6$$

Question 8

Which of the following best describes the geometry of a molecule with three electron groups and no lone pairs on the central atom?

Accepted Answer

Trigonal planar

Question 9

What is the molecular geometry of ammonia ($$\mathrm{NH}_3$$)?

Accepted Answer

Trigonal pyramidal

Question 10

Which of the following statements about bond energies is correct?

Accepted Answer

Bond breaking is endothermic and bond making is exothermic.

Question 11

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

Accepted Answer

CO$$_2$$

Question 12

What is the bond angle in a molecule with tetrahedral geometry?

Accepted Answer

$$109.5^\circ$$

Question 13

Which of the following best describes the effect of lone pairs on bond angles in a molecule?

Accepted Answer

Lone pairs decrease bond angles.

Question 14

A molecule has five electron groups around the central atom, two of which are lone pairs. What is the molecular geometry?

Accepted Answer

T-shaped

Question 15

Which of the following is always true according to VSEPR theory?

Accepted Answer

The shape of a molecule is determined by repulsions among all electron groups on the central atom.

Question 16

Which of the following molecules is expected to be polar?

Accepted Answer

NH$$_3$$

Question 17

Which of the following best describes the bond type in a molecule with an electronegativity difference of 2.1?

Accepted Answer

Ionic

Question 18

Which of the following is the correct Lewis structure for the nitrate ion, $$\mathrm{NO}_3^-$$, including resonance?

Accepted Answer

Three resonance structures, each with a double bond to a different oxygen.

Question 19

Which of the following molecules has a bond angle closest to $$120^\circ$$?

Accepted Answer

BF$$_3$$

Question 20

Which of the following best describes the molecular geometry of $$\mathrm{SF}_4$$?

Accepted Answer

Seesaw

Chemical Bonding and Molecular Geometry: Study Notes for General Chemistry

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