Ionic, Covalent And Nanoscience Questions Flashcards
Why is nitrogen a gas at room temp?
Nitrogen has weak inter-molecular forces which require less energy to break.
This means less energy is required to break intermolecular forces so they have lower melting and boiling points.
Why are Fullerenes good lubricants?
Spherical so are able to roll
Why does Helium exist only as a single atom?
It has a full outer shell so highest energy level is full leaving it no need to bond.
Why does sodium chloride have a quite high melting point?
Giant ionic lattice, meaning bonds between ions are quite strong because there are so many to break.
Why is Graphite softer than diamond?
Because Layers of graphite can slide because layers have weak inter molecules forces between the layers.
Whilst each atom in diamond is strongly bonded to 4 others, so no carbon atoms are able to move/slide.
Why can Graphite conduct whilst diamond can not?
Graphite is bonded to 3 other carbons so there are many free electrons from all the carbon atoms.
Diamond is bonded to 4 so there are no free electrons.
The electrons which can move around are the flow of electrons and are the charge which conducts electricity.
Why don’t companies test products?
Find something which means they can’t sell it anymore e.g. harmful effects
Testing is time consuming
