Covalent Bonding Quiz

How do we identify covalent compounds or substances?

• they are made up of metals and non-metals

• they are made up of non-metals only

• they are made up of metals only

Which of the following are covalent substances?

• CO₂

• NH₃

• NaF

• N ≡ N

• MgO

What are covalent bonds?

• transfer of electrons

• sharing of electrons

Which of the following is the correct dot-and-cross diagram of fluorine molecule?

• 
• 
• 
• 

Which of the following dot-and-cross diagrams of water molecule are correct (valence shell only)?

• 
• 
• 
• 

What is the chemical formula of phosphorous trichloride?

• P₃Cl

• P3Cl

• P₃Cl

• PCl₃

Covalent substances have _________ melting point and boiling points due to __________ ________________ forces of attraction. (type the 3 answers with a space between the words.)

(a)  

Covalent substances are usually (a)   in water.

Which keywords explain whether covalent substances conduct electricity or not?

• conduct electricity

• does not conduct electricity

• free moving ions

• no free moving ions nor electrons

• neutral, no charge

Which of the following is/are most likely covalent substance(s)?

• A: has a boiling point of 78 ^oC.

• B: forms a solution that can light up a lightbulb.

• C: insoluble in water and has weak forces of attraction.

• D: has a melting point of 500 ^oC and conducts electricity when melted.