Question 1

Which of the following statements best describes a covalent bond?

Accepted Answer

A bond formed by sharing electrons between atoms.

Question 2

Which of the following elements is most likely to form a molecule with an expanded octet?

Accepted Answer

Phosphorus

Question 3

What is the correct Lewis structure for carbon dioxide ($$CO_2$$)?

Accepted Answer

$$O=C=O$$

Question 4

Which molecule is nonpolar despite having polar bonds?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 5

Which of the following best explains why ionic compounds have higher melting points than molecular compounds?

Accepted Answer

Ionic compounds are composed of ions held together by strong electrostatic attractions.

Question 6

How many covalent bonds does a nitrogen atom typically form to achieve an octet?

Accepted Answer

Three

Question 7

Which of the following molecules contains a coordinate covalent bond?

Accepted Answer

$$NH_4$$^+$$

Question 8

What is the molecular geometry of ammonia ($$NH_3) $$according to the VSEPR model?

Accepted Answer

Pyramidal

Question 9

Which of the following best describes the bond in a $$HCl$$ molecule?

Accepted Answer

Polar covalent

Question 10

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

Accepted Answer

Polar covalent

Question 11

Which of the following is the correct name for $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 12

Which of the following molecules is expected to be planar based on VSEPR theory?

Accepted Answer

$$C_2H_4 ($$ethylene)

Question 13

A molecule has the formula $$SF_6. $$What is the geometry around the sulfur atom?

Accepted Answer

Octahedral

Question 14

Which of the following is a correct molecular formula for silicon tetrachloride?

Accepted Answer

$$SiCl_4$$

Question 15

Which molecule below is most likely to have a net dipole moment?

Accepted Answer

$$H_2O$$

Question 16

Which of the following best describes the difference between a single, double, and triple bond?

Accepted Answer

A single bond shares one pair of electrons, a double bond shares two pairs, and a triple bond shares three pairs.

Question 17

Which of the following compounds is most likely to conduct electricity when dissolved in water?

Accepted Answer

$$NaCl$$

Question 18

Which of the following is the correct Lewis structure for ammonia ($$NH_3$$)?

Accepted Answer

A nitrogen atom with three single bonds to hydrogen atoms and one lone pair on nitrogen.

Question 19

Which of the following best describes the bond angle in a water molecule ($$H_2O$$)?

Accepted Answer

$$104.5^\circ$$

Question 20

Which of the following is a real-world application of a coordinate covalent bond?

Accepted Answer

The bonding in $$NH_4$$^+$$ (ammonium ion) formed when NH_3$ accepts a proton (H$$^+$$).

Chapter 4: Molecular Compounds – Structure, Bonding, and Properties

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