Chem ch 13 Flashcards
NON polar
hydrocarbons
3 important intermolecular forces between alkane (types of bonding)
dipole-dipole, hydrogen bonding, and london
dipole-dipole force (abba)
attraction between two partially opposite charged groups - aka - polar molecules ex. A-B and A-B (A positive and B negative)
stronger than dipole dipole
hydrogen bonding
hydrogen bonding (hydrogen bonds are FON)
when there is H and Oxygen, Nitrogen, Fluorine. H-O, H-N, H-F. hydrogen of one molecule and oxygen or nitrogen of another molecule
unique properties of H bonds
water has high boiling point, surface tension
london dispersion (away from london)
induced polarity - the only forces that non-polar molecules can form. Only intermolecular forces available in non-polar molecules, such as alkane
H-H bond is (type of bond and type of molecule)
nonpolar bond, AND it’s a nonpolar molecule
methane - CH4 - polar or nonpolar?
it’s nonpolar MOLECULE because the H is pulling evenly 4 ways. in methane, the BONDS are polar
strongest to weakest bonds
hydrogen, dipole-dipole, london
the stronger the bond…
the higher the boiling and melting point.
The more surface area, the higher the…
LDF
first 4 alkanes at room temp are…(4 different gases)
methane, ethane, propane, and butane - first 4 alkanes are gas (boiling point is below room temp)
5 - 15 alkanes at room temp are…(515 liquids)
liquid at room temp
combustion reaction
this is burning in oxygen. reason is to produce heat/ energy
formula for complete combustion of alkane
2CnH2n + (3n + 1) O2 - 2nCO2 + (2n +2) H20 (n is the number of the carbons - use the original number of carbons you start with)
halogenation reaction (just 2)
replacing hydrogen with halogens.
replacing h with either Cl or Br. - must be initiated by either heat or light (usually UV)
steps of holagenation (beginning to end)
- initiation, propagation, termination
initiation
radicals are formed by homolytic cleavage. bonds are broken down in such a way that 2 bonding electrons divide equally between the 2 atoms
how to name alkyl halide
find longest chain, identify parents, halogen, name main chain. - all the same but one - **drop ine and replace with 0
chiral carbon
not superimposable - called enatomers - connected with 4 different groups. /also called optical.
can hydrocarbons be dissolved in water?
usually not
intermolecular forces
forces holding electrons together
gases at room temp - polar or non?
non-polar
these are NOT called molecules
ionic compounds
even though sulfur (H2S) is lower on the periodic table, it has a lower boiling point…
than water - it should be higher bc the mass is more. Hydrogen bonding is really strong.
water boiling point
100 degrees celcius
alkane cannot make..(type of bond)
hydrogen bonding
alcohol can make…(type of bond)
hydrogen bonding