Question 1

Which of the following molecules is expected to be nonpolar, despite having polar bonds, due to its molecular geometry?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 2

What is the approximate bond angle in a molecule with tetrahedral electron geometry and no lone pairs on the central atom?

Accepted Answer

$$109.5^\circ$$

Question 3

Which intermolecular force is primarily responsible for the high boiling point of water ($$H_2O$$)?

Accepted Answer

Hydrogen bonding

Question 4

A molecule of formaldehyde ($$CH_2O) $$has which molecular geometry and is it polar or nonpolar?

Accepted Answer

Trigonal planar, polar

Question 5

Which of the following statements best explains why $$CH_4 ($$methane) is a gas at room temperature while $$H_2O ($$water) is a liquid?

Accepted Answer

$$CH_4$$ has only London dispersion forces, while $$H_2O$$ has hydrogen bonding

Question 6

Which of the following molecules will have a net dipole moment?

Accepted Answer

Ammonia ($$NH_3)$$

Question 7

Given the electronegativity values: H = 2.1, Cl = 3.0, what type of bond is present in $$HCl$$?

Accepted Answer

Polar covalent

Question 8

Which of the following best describes the electron geometry and molecular geometry of $$SO_2 ($$sulfur dioxide)?

Accepted Answer

Trigonal planar electron geometry, bent molecular geometry

Question 9

Which of the following molecules would you expect to have only London dispersion forces as the main intermolecular force?

Accepted Answer

Nitrogen ($$N_2)$$

Question 10

A molecule has four electron groups around the central atom, one of which is a lone pair. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 11

Which of the following best explains why DNA strands are held together?

Accepted Answer

Hydrogen bonding between base pairs

Question 12

Which of the following molecules is expected to have a bent molecular geometry?

Accepted Answer

Water ($$H_2O)$$

Question 13

Which of the following is the strongest type of intermolecular force?

Accepted Answer

Hydrogen bonding

Question 14

If a molecule has a central atom with two bonding pairs and two lone pairs, what is its molecular geometry and approximate bond angle?

Accepted Answer

Bent, $$109.5^\circ$$

Question 15

Which of the following molecules is most likely to be soluble in water due to its polarity?

Accepted Answer

Methanol ($$CH_3OH)$$

Question 16

Which of the following best describes the difference between electron geometry and molecular geometry?

Accepted Answer

Electron geometry considers all electron groups; molecular geometry considers only the arrangement of atoms

Question 17

Which of the following molecules has a linear molecular geometry?

Accepted Answer

Hydrogen cyanide ($$HCN)$$

Question 18

Which of the following is true about London dispersion forces?

Accepted Answer

They are present in all molecules, regardless of polarity

Question 19

Which of the following molecules would have the highest boiling point due to intermolecular forces?

Accepted Answer

Methanol ($$CH_3OH)$$

Question 20

A molecule has three electron groups around the central atom, one of which is a lone pair. What is its molecular geometry?

Accepted Answer

Bent

Molecular Geometry, Polarity, and Intermolecular Forces of Attraction

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