3.6 structure of simple molecules
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What is a limitation of a 2d ball and stick model
it shows all angles as 90 degrees but some aren’t
what is a limitation of a 3d ball and stick model
it’s hard to see the shape of the molecule
what is a good thing about the molecular model kit
you can see the 3d shape of the molecule
what is a limitation of the dot and cross diagram
shows the electrons as being different, but they are actually all the same
what’s a problem with all diagrams on paper
the electrons are in fixed positions, but scientists believe that electrons in covalent bonds are constantly moving
what is a limitation with diagrams of giant lattices
can’t reflect the millions of atoms bonded together in giant lattices
what is a good thing about diagrams of giant lattices
they show the correct ratio of each element
intermolecular forces def
the attraction between the individual molecules in a covalently bonded substance
what happens to intermolecular forces as the molecule gets bigger
the intermolecular forces get bigger
polymers def
a substance made from very large molecules made up of many repeating units
do compounds made up of simple molecules conduct electricity
no, even when molten or dissolves in water, unless they react with water to form aqueous ions as acid molecules do
why do simple molecules in a compound not conduct electricity
because there is no overall charge
why do simple molecules have low melting and boiling points
• there are weak intermolecular forces between the molecules • these forces require little or no energy to overcome
how are the atoms in the polymer molecules linked to other atoms
via strong covalent bonds