Section 2.3 Q-cards

Question 1

How to identify the difference between ionic and molecular compounds

Answer 1

The type of atom, Nonmetals with nonmetals/Metals with nonmetals

Question 2

Polarity (Ionic)

Answer 2

The ionic compounds are polar in nature as there are positive and negative ions due to electronegativity differences.

Question 3

Strength (Ionic)

Answer 3

The strength of ionic bond is high due to strong electrostatic forces.

Question 4

Solubility (Ionic)

Answer 4

Because of polarity, they are soluble in polar solvents.

Question 5

Polarity (Covalent)

Answer 5

The covalent compounds are non-polar in nature as there are no positive and negative ions.

Question 6

Strength (Covalent)

Answer 6

The strength of covalent bond is weaker due to lack of electrostatic forces.

Question 7

Solubility (Covalent)

Answer 7

It is not soluble in polar solvents because it is non-polar.

Question 8

Electrostatic forces

Answer 8

➢The electrostatic force is the force of attraction or repulsion between two charged particles.
➢The force between the protons and electrons in an atom is electrostatic and is responsible for the atom’s stability.
➢The electrostatic bonding force is important and binds an ionic compound.

Question 9

Electrical conductivity (Ionic)

Answer 9

In solid ionic compounds, ions are fixed in positions.
The ionic compound does not conduct electricity in the solid state. In aqueous solution or molten state, ions are free to move. Therefore, the compound can conduct electricity.

Question 10

Electrical conductivity (Covalent)

Answer 10

Covalent compound consists of neutral molecules. Hence, covalent compounds do not conduct electricity in all states.

Question 11

Explain Melting points and boiling points (I)

Answer 11

The ions in ionic compounds are held together by strong ionic bonds. It would take a lot of energy to overcome the strong electrostatic forces that are holding the ions together. This explains why ionic compounds have high melting and boiling points.

Question 12

Explain Melting points and boiling points (M)

Answer 12

Molecules in covalent compounds are held together by weak intermolecular forces. It means less heat energy is required to overcome these forces. This explains why covalent compounds have low melting and boiling points.

Question 13

Dipole?

Answer 13

a molecule with a slightly positively charged end (positive pole) and a slightly negatively charged end(negative pole).

Question 14

dipole-dipole force

Answer 14

the attractive force between the positive end of one molecule and the negative end of another molecule.

Question 15

intermolecular forces

Answer 15

attractive forces that act between molecules.

Question 16

The shape of a ionic and molecular compound (The state of matter)

Answer 16

Ionic
Exist as solid in room temperature

Molecular
May exist as solid, liquid or gases

Question 17

The Melting and boiling points of a ionic and molecular compound (find difference not number)

Answer 17

Ionic
High

Moleuclar
Low

Question 18

The Electricity Conductivity of a ionic and molecular compound (find difference not number)

Answer 18

Ionic
Conducts only in a molten state or in a aqueous solution

Molecular
No, no electrostatic force

Question 19

Solubility in water between Ioinc and molecular compounds

Answer 19

Ionic
Soluble

Molecular
Insoluble