[Sunra89]

I'm just going over some revision, and something has really thrown me off. It states non-polar molecules or (Van der Waals bonding) is the weakest type of bond, and covalent bonds are strongest, yet non-polar molecules such CO2 form a non polar yet covelant bond, so I'm confused whether or not this is a strong or weak bond.

[Nobby]

The difference is the intermolecular bond and the intramolecular bond. The Bonding between carbon and oxygen (intramolecular) in CO₂ is strong the bonding between some CO₂ molecule (intermolecular) each other will be more weak.