Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by sharing electrons between two atoms.

Question 2

Which of the following elements is most likely to form a diatomic molecule (X$$_2) in $$its natural state?

Accepted Answer

Nitrogen (N$$_2)$$

Question 3

How many valence electrons does a chlorine atom (Z=17) have?

Accepted Answer

$$7$$

Question 4

What is the electron dot (Lewis dot) symbol for chlorine?

Accepted Answer

$$\mathrm{Cl}$$ with 7 dots around it

Question 5

When two chlorine atoms form a Cl$$_2$$ molecule, how many electrons are shared between them?

Accepted Answer

$$2$$

Question 6

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Covalent bonds involve sharing electrons, while ionic bonds involve transferring electrons.

Question 7

Which group in the periodic table typically forms two covalent bonds?

Accepted Answer

Group 6A

Question 8

What is the bond length of the H$$_2$$ molecule as shown in the provided diagram?

Accepted Answer

$$74\ \mathrm{pm}$$

Question 9

Which of the following best explains why noble gases (Group 8A) do not typically form covalent bonds?

Accepted Answer

They have a full valence shell and are chemically stable.

Question 10

Which of the following is a correct Lewis dot structure for oxygen (O)?

Accepted Answer

$$\mathrm{O}$$ with 6 dots around it

Question 11

Which of the following elements is most likely to form four covalent bonds in a molecule?

Accepted Answer

Carbon (C)

Question 12

A molecule of water (H$$_2O) $$contains which type of bonds?

Accepted Answer

Two covalent bonds

Question 13

Which of the following best describes a molecule?

Accepted Answer

A group of atoms held together by covalent bonds

Question 14

Which of the following elements is least likely to form a covalent bond?

Accepted Answer

Helium (He)

Question 15

If two atoms are too close together, what happens to the potential energy of the system?

Accepted Answer

It increases due to repulsive forces.

Question 16

Which of the following is a correct statement about the formation of a Cl$$_2$$ molecule?

Accepted Answer

Each chlorine atom shares one electron to form a single covalent bond.

Question 17

Which of the following best explains why hydrogen forms only one covalent bond?

Accepted Answer

Hydrogen has only one electron and needs only one more to fill its valence shell.

Question 18

Which of the following elements is most likely to form three covalent bonds?

Accepted Answer

Nitrogen (N)

Question 19

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a group of atoms held together by covalent bonds, while a compound is a pure substance that can be broken down by chemical reactions.

Question 20

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

Accepted Answer

Water (H$$_2O)$$

Covalent Bonds: Fundamentals for GOB Chemistry

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