Covalent bonding

Question 1

Why don’t covalent compounds electricity?

Answer 1

The molecules are neutral and there are no charged particles (no ions or electrons) that can carry the charge

Question 2

Why do giant covalent substances have high melting points

Answer 2

The melting and boiling points of giant covalent structures is really high because of the covalent bonds that hold the atoms together.

Question 4

What is a covalent bond?

Answer 4

A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.

Question 5

True or False: Covalent bonds typically occur between metals and nonmetals.

Answer 5

False

Question 6

What type of elements typically form covalent bonds?

Answer 6

Nonmetals

Question 7

Fill in the blank: In a covalent bond, atoms share ______ to achieve stability.

Answer 7

electrons

Question 8

What is the difference between a single covalent bond and a double covalent bond?

Answer 8

A single covalent bond involves one pair of shared electrons, while a double covalent bond involves two pairs of shared electrons.

Question 9

Which molecule is an example of a double covalent bond?

Answer 9

O2 (oxygen gas)

Question 10

True or False: Covalent bonds can form between identical atoms.

Answer 10

True

Question 11

What term describes the measure of the ability of an atom to attract shared electrons in a covalent bonds

Answer 11

Electronegativity

Question 12

What is a polar covalent bond?

Answer 12

A polar covalent bond is a type of bond where electrons are shared unequally between two atoms, resulting in a partial charge.

Question 13

True or False: Covalent compounds usually have high melting and boiling points.

Answer 13

false as they have intermolecular forces meaning they can be easily separated

Question 14

What is the main reason that covalent compounds tend to be poor conductors of electricity?

Answer 14

They do not have free-moving charged particles.

Question 15

Fill in the blank: When two atoms share three pairs of electrons, the bond is called a ______ covalent bond.

Answer 15

triple

Question 16

True or False: Covalent bonds can form between atoms of different elements only.

Answer 16

False

Question 17

What is the significance of the octet rule in covalent bonding?

Answer 17

Atoms tend to form bonds in such a way that they have eight electrons in their valence shell, achieving stability.

Question 18

Fill in the blank: The bond formed between two hydrogen atoms (H2) is an example of a ______ covalent bond.

Answer 18

single

Question 19

True or False: Covalent compounds can exist as gases, liquids, or solids at room temperature.

Answer 19

True

Question 20

What is a coordinate covalent bond?

Answer 20

A bond in which one atom donates both electrons to be shared with another atom.

Question 21

What are simple covalent molecules?

Answer 21

Molecules formed by the sharing of electrons between non-metal atoms.

Question 22

True or False: Simple covalent molecules have high melting and boiling points.

Answer 22

False

Question 23

Fill in the blank: Simple covalent molecules typically exist as ______ at room temperature.

Answer 23

gases or liquids

Question 24

What is a common property of simple covalent molecules regarding electrical conductivity?

Answer 24

They do not conduct electricity.

Question 25

What type of bond is present in simple covalent molecules?

Answer 25

Covalent bonds

Question 26

True or False: Simple covalent molecules are usually soluble in polar solvents.

Answer 26

False

Question 27

What is the typical state of simple covalent molecules at room temperature?

Answer 27

They can be gases, liquids, or low-melting solids.

Question 28

What effect does molecular size have on the boiling point of simple covalent molecules?

Answer 28

Larger molecules generally have higher boiling points.

Question 29

True or False: Simple covalent molecules can form crystals.

Answer 29

True

Question 30

What is the general trend in melting points for simple covalent molecules?

Answer 30

They tend to have low melting points.

Question 31

Which property distinguishes simple covalent molecules from ionic compounds?

Answer 31

Covalent molecules have low electrical conductivity.

Question 32

What happens to the boiling point of a simple covalent molecule as the molecular weight increases?

Answer 32

The boiling point generally increases.

Question 33

True or False: Simple covalent molecules can conduct electricity when dissolved in water.

Answer 33

False

Question 34

Which of the following is NOT a characteristic of simple covalent molecules? (A) Low melting points (B) High solubility in water (C) Poor electrical conductivity

Answer 34

B) High solubility in water

Question 35

How do simple covalent molecules typically interact with each other?

Answer 35

Through weak intermolecular forces.

Question 36

True or False: Simple covalent molecules are made of metal atoms.

Answer 36

False

Question 37

What is an example of a simple covalent molecule that is a gas at room temperature?

Answer 37

Oxygen (O2)

Question 38

Which property of simple covalent molecules is primarily responsible for their low melting and boiling points?

Answer 38

Weak intermolecular forces

Question 39

True or False: Simple covalent molecules can form ions in solution.

Answer 39

False

Question 40

Describe the forces of attraction in a covalent bond.

Answer 40

There is a strong electrostatic attraction between the negatively charged shared electrons and the positively charged nuclei of the atoms involved.