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 element is an exception to the octet rule and typically forms only three covalent bonds?

Accepted Answer

Boron

Question 3

What is the molecular geometry of methane ($$\mathrm{CH_4$}) $$according to the VSEPR model?

Accepted Answer

Tetrahedral

Question 4

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

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 5

A molecule of acetaldehyde ($$\mathrm{CH_3CHO}) $$has two carbon atoms. What is the geometry around each carbon atom?

Accepted Answer

One is tetrahedral, the other is trigonal planar

Question 6

Which of the following best describes a coordinate covalent bond?

Accepted Answer

A bond formed when both electrons are donated by the same atom.

Question 7

What is the correct molecular formula for silicon tetrachloride?

Accepted Answer

$$\mathrm{$$SiCl_4$$}$$

Question 8

Which of the following is a diatomic element?

Accepted Answer

Chlorine ($$\mathrm{Cl_2$})$$

Question 9

What is the bond angle in a water ($$\mathrm{H_2O}) $$molecule?

Accepted Answer

$$104.5^\circ$$

Question 10

Which of the following compounds contains a triple bond?

Accepted Answer

Nitrogen ($$\mathrm{N_2$})$$

Question 11

Which of the following statements about molecular compounds is TRUE?

Accepted Answer

They are composed of molecules held together by covalent bonds.

Question 12

What is the correct name for $$\mathrm{N_2O_3}$$?

Accepted Answer

Dinitrogen trioxide

Question 13

Which of the following best explains why water is a polar molecule?

Accepted Answer

It has a bent shape and unequal sharing of electrons due to electronegativity differences.

Question 14

Which of the following bonds is most likely to be ionic based on electronegativity difference?

Accepted Answer

Li—Cl

Question 15

What is the correct Lewis structure for hydrogen cyanide ($$\mathrm{HCN}$$)?

Accepted Answer

$$\mathrm{H-C\equiv N}$$

Question 16

Which of the following molecules would you expect to be planar?

Accepted Answer

Ethylene ($$\mathrm{C_2H_4})$$

Question 17

Which element has the highest electronegativity?

Accepted Answer

Fluorine

Question 18

What is the correct molecular formula for carbon disulfide?

Accepted Answer

$$\mathrm{CS_2$}$$

Question 19

Which of the following is a characteristic property of ionic compounds?

Accepted Answer

Conduct electricity when molten or dissolved in water

Question 20

Which of the following best describes the bond in $$\mathrm{HCl}$$?

Accepted Answer

Polar covalent

Molecular Compounds: Covalent Bonding, Structure, and Properties

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