Structure of simple molecules Flashcards
What are intermolecular forces?
The attraction between the individual molecules in a covalently bonded substance
What is a polymer?
A substance made from very large molecules made up of many rep[eating units.
How strong are intermolecular forces between individual molecules in a covalent substance?
They are very weak and not hard to overcome. However, intermolecular forces increase with the size of of the molecules, so larger molecules have higher melting points and boiling points. For example because polymers, are made from very long chain molecules. These stronger intermolecular forces make polymers a solid at room temperature.
Why don’t substances made of simple molecules not conduct electricity
Simple molecules have no overall charge so, they cannot carry electrical charge.
Why do substances made of simple molecules have low melting and boiling points?
Intermolecular forces increase with the size of of the molecules, so larger molecules have higher melting points and boiling points and vice versa so simple molecules have low melting and boiling points
What are the limitations of the ball and stick model showing how atoms are bonded to each other?
It does not allow you to see the true 3-d shape of the molecule.
What are the limitations of dot and cross diagrams?
The electrons are in fixed positions however scientists believe that the electrons in covalent bonds are constantly moving, but on average found most of the time between the two nuclei of the atoms they are bonding together.
