Question 1

Which of the following best explains why morphine can mimic the action of endorphins in the human body?

Accepted Answer

Morphine has a similar molecular shape to endorphins, allowing it to bind to the same opioid receptors.

Question 2

According to Lewis theory, why do atoms form chemical bonds?

Accepted Answer

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

Question 3

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

Accepted Answer

Li and F

Question 4

Given the electronegativities: Sr (1.0) and F (4.0), what type of bond forms between Sr and F?

Accepted Answer

Ionic

Question 5

Which of the following statements about resonance structures is TRUE?

Accepted Answer

Resonance structures differ only in the position of electrons, not the connectivity of atoms.

Question 6

What is the formal charge on nitrogen in the Lewis structure of ammonia, $$\mathrm{NH_3$}$$?

Accepted Answer

$$0$$

Question 7

Which molecule below is expected to be a free radical?

Accepted Answer

ClO

Question 8

Which of the following molecules can have an expanded octet?

Accepted Answer

SF$$_6$$

Question 9

What is the molecular geometry of ammonia, $$\mathrm{NH_3$}$$?

Accepted Answer

Trigonal pyramidal

Question 10

A central atom in a three-atom molecule forms two double bonds and has no lone pairs. What is the geometry of the molecule?

Accepted Answer

Linear

Question 11

Which of the following best describes the trend in bond length for covalent bonds?

Accepted Answer

Bond length decreases as the number of shared electrons increases.

Question 12

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

Accepted Answer

CO$$_2$$

Question 13

Which statement 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 14

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

Accepted Answer

Lone pairs decrease the bond angles between bonding pairs.

Question 15

Which of the following molecules is expected to be polar?

Accepted Answer

H$$_2O$$

Question 16

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

Accepted Answer

Bent

Question 17

Which of the following is the correct Lewis structure for the ammonium ion, $$\mathrm{NH_4$^+}$$?

Accepted Answer

A central N atom with four single bonds to H atoms, enclosed in brackets with a $$+$$ charge.

Question 18

Which of the following best describes the relationship between bond energy and bond length?

Accepted Answer

Shorter bonds are generally stronger (higher bond energy) than longer bonds.

Question 19

Which of the following steps is NOT part of the procedure for writing a Lewis structure for a covalent compound?

Accepted Answer

Assigning formal charges to each atom as the first step.

Question 20

Which of the following molecules has a trigonal planar molecular geometry?

Accepted Answer

BF$$_3$$

Chemical Bonding, Lewis Structures, and Molecular Geometry: Study Notes for General Chemistry

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