polarity and IMF - chemistry quiz

ms lemme

non-polar covalent bonds

when the atoms in a bond are the same, the electrons are shared equally

polar covalent bonds

when 2 different atoms are connected/bonded, the electrons may not be shared equally

C-H bonds are exceptions, they are always nonpolar

C-H bonds are exceptions, they are always nonpolar

electronegativity can be used to measure how strong the atoms pull on electrons

electronegativity can be used to measure how strong the atoms pull on electrons

dipole

an arrow used to show if a bond is polar

it is not a whole charge, just a partial charge

the dipole arrow points towards the most electronegative atom

partial charges

you can identify the partial charges by looking at the deltas if there are any

δ+ means partially positive

δ- means partially negative

polar molecules

molecules with a positive and negative end

• if the molecule as a lone pair on the central atom, the molecule is polar overall

• if the molecule has no lone pairs on the central atom and the outer atoms are different the molecule is polar overall

• if the molecule has no lone pairs on the central atom and all the outer atoms are the same the molecule is nonpolar overall

intramolecular forces

forces with a molecule

intermolecular forces

forces between molecules

they are much weaker than covalent bonds