GCSE U1 T3 Structure and Properties of Non-Metallic Substances

Name and describe the structure of most non-metallic substances.

• Most non-metallic substances have a network covalent structure.
• Most non-metallic substances have a metallic molecular structure.
• Most non-metallic substances have a covalent molecular structure.
• Most non-metallic substances have an ionic molecular structure.

Are covalent bonds strong or weak?

• Strong

• Weak

Property of molecular covalent substances resulting in alot of them being gases and liquids

Label the diagram

c

d

Strong covalent bonds

within molecules

between molecules

Weak Van der Waals

Label the diagram

a

b

Weak

within molecules

Van der Waals between molecules

Strong covalent bonds

What are the weak forces of attraction called that exist between molecules in molecular covalent substances

Why do molecular covalent substances have low melting and boiling points.​

• do not require a lot

• Van der Vaal's forces

• between molecules

• weak

• of energy to break

Explain why molecular covalent substances do not conduct electricity

• because they solid

• because they are not charged

• because they are mainly gases

• because there are no particles free to move and carry an electric current

What is an allotrope

• different

• of the same element

• physical state

• forms

• in the same

What are the 3 allotropes of carbon in alphabetical order