Question 1

Which of the following statements best describes the formation of a covalent bond between two hydrogen atoms, as shown in the diagram?

Accepted Answer

Each hydrogen atom shares its electron with the other, resulting in both atoms achieving the noble gas configuration of helium.

Question 2

Which elements exist naturally as diatomic, covalent molecules according to the periodic table and the provided list?

Accepted Answer

H2, N2, O2, F2, Cl2, Br2, I2

Question 3

What is the correct prefix for a covalent compound containing seven atoms of a particular element?

Accepted Answer

Hepta-

Question 4

In the Lewis structure for HF, how many electrons are around the hydrogen atom and how many are around the fluorine atom?

Accepted Answer

Two electrons around H, eight electrons around F

Question 5

Which statement about resonance structures is correct, based on the diagram showing HCO3−?

Accepted Answer

Resonance structures have the same arrangement of atoms but different arrangements of electron pairs.

Question 6

What is the bond angle in a linear molecule, as shown in the diagram?

Accepted Answer

$$180^\circ$$

Question 7

Which molecule has a linear shape and a bond angle of $$180^\circ$$?

Accepted Answer

CO2

Question 8

What is the bond angle in a trigonal planar molecule, and which molecule is an example?

Accepted Answer

$$120^\circ$$; BF3

Question 9

Which molecule has a bent shape with a bond angle of $$120^\circ$$ due to a lone pair on the central atom?

Accepted Answer

SO2

Question 10

What is the bond angle in a tetrahedral molecule, and which molecule is an example?

Accepted Answer

$$109.5^\circ$$; CH4

Question 11

Which molecule has a trigonal pyramidal shape and a bond angle of approximately $$107^\circ$$?

Accepted Answer

NH3

Question 12

Which molecule has a bent shape with a bond angle of approximately $$105^\circ$$ due to two lone pairs on the central atom?

Accepted Answer

H2O

Question 13

Which element has the highest electronegativity according to the periodic trend diagram?

Accepted Answer

Fluorine

Question 14

A bond between two atoms with an electronegativity difference of 0.2 is classified as:

Accepted Answer

Nonpolar covalent

Question 15

Which bond is polar, based on the electronegativity values: C (2.5), O (3.5)?

Accepted Answer

C–O

Question 16

Which molecule is nonpolar because its dipoles cancel, as shown in the diagram?

Accepted Answer

CO2

Question 17

Which molecule is polar because its dipoles do not cancel, as shown in the diagram?

Accepted Answer

NH3

Question 18

Which molecule is nonpolar due to its tetrahedral shape and identical atoms attached to the central atom?

Accepted Answer

CCl4

Question 19

Which molecule is polar due to its bent shape and the fact that its dipoles do not cancel?

Accepted Answer

H2O

Question 20

Which molecule has a net dipole due to the presence of a polar bond between carbon and chlorine?

Accepted Answer

CH3Cl

Covalent Compounds: Structure, Bonding, and Properties

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