Covalent bonding/ simple molecules

Question 1

What force is overcome when covalent molecular substances melt or boil?

Answer 1

Intermolecular forces

Question 2

What are the properties of a simple molecule/ simple covalent compound

Answer 2

Atoms within the molecules are held together by strong covalent bonds

The forces of attraction between these molecules are weak

Low melting/boiling point

Mostly gases/liquid at room temperature

Don’t conduct electricity

Question 3

Why are small covalent molecules liquids or gases at room temperature?

Answer 3

When small molecules melt or boil, it’s the weak intermolecular forces that break.
Since these intermolecular forces are weak and break easily, simple covalent molecules have very low melting and boiling points.
Therefore, they exist as liquid and gases at room temperature.

Question 4

How is a covalent bond formed?

Answer 4

By sharing pairs of electrons between two atoms

Question 5

What combination of elements will form covalent bonds?

Answer 5

Non-metal atom and another non-metal atom

Question 6

How does the group number relate to the number of covalent bonds there will be?

Answer 6

E.g group 5 elements will require 3 electrons to fill outer shell

They will be 3 covalent bonds.