Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of valence electrons between atoms.

Question 2

According to the octet rule, atoms tend to gain, lose, or share electrons to achieve how many valence electrons?

Accepted Answer

$$8$$

Question 3

Which element is least likely to form covalent bonds?

Accepted Answer

$$Ar$$

Question 4

What is the correct Lewis structure for a molecule of $$H_2O$$?

Accepted Answer

O atom with two single bonds to H atoms and two lone pairs on O.

Question 5

Which of the following compounds is expected to have the lowest boiling point?

Accepted Answer

$$CO_2$$

Question 6

Why do covalent compounds generally have lower melting and boiling points compared to ionic compounds?

Accepted Answer

Covalent compounds have weaker intermolecular forces.

Question 7

Which rule states that atoms tend to form bonds until they are surrounded by eight valence electrons?

Accepted Answer

Octet Rule

Question 8

Which of the following best explains why noble gases rarely form covalent bonds?

Accepted Answer

They have a full octet of valence electrons.

Question 9

Which of the following is a property of covalent compounds?

Accepted Answer

Low melting and boiling points.

Question 10

If hydrogen forms a covalent bond, how many electrons does it share to achieve stability?

Accepted Answer

$$2$$

Question 11

Which of the following molecules contains a double covalent bond?

Accepted Answer

$$O_2$$

Question 12

A student mixes two covalent compounds in water. What is the most likely observation?

Accepted Answer

The compounds dissolve but do not conduct electricity.

Question 13

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonding involves transferring electrons, covalent bonding involves sharing electrons.

Question 14

Which of the following elements is most likely to form a covalent bond with hydrogen?

Accepted Answer

$$O$$

Question 15

Which of the following statements about covalent compounds is true?

Accepted Answer

They tend to have low melting and boiling points.

Question 16

Which of the following is a real-world example of a covalent compound?

Accepted Answer

Water ($$H_2O)$$

Question 17

Which of the following best explains why $$CO_2$$ has a low boiling point?

Accepted Answer

It is a covalent compound with weak intermolecular forces.

Question 18

Which of the following is NOT a property of covalent compounds?

Accepted Answer

High electrical conductivity

Question 19

Which of the following best describes the duet rule?

Accepted Answer

Atoms are stable with two valence electrons, typically seen in hydrogen and helium.

Question 20

Which of the following molecules is most likely to be a gas at room temperature due to its covalent nature?

Accepted Answer

$$CO_2$$

Covalent Bonding and Properties of Covalent Compounds

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