Hydrogen Bonding

k so last class we started learning about molecular polarity and intermolecular bonds, but we didn't get the chance to get to hydrogen bonds so thats what we talked about the most today

• hydrogen bonding is a special type of dipole-dipole bond
• it occurs between hydrogen and nitrogen, oxygen and flourine

H-N, H-O, H-F

now just to recap all the the types of bonding forces:

• London Dispursion Force (L.D.F) is experienced by all molecules but is the weakest of bonds
• Dipole-Dipole is only present in some molecules, and is stronger than LDF
• Hydrogen Bonds are the strongest of all the molecular bonds and are only found in a couple of different molecules

one example we went through was putting some molecules in order of the strongest bond to the weakest bond. the ones we used were:

1. C2H5OH: 26 electrons and a bp of 78 degrees Celsius

2. CH3OH: 18 elestrons with a bp of 65 degrees Celsius

3. C2H6: 18 elesctrons with a bp of -89 degrees Celsius

4. CH4: 10 electrons with a bp of -161 degrees Celsius

now that we had finished talking about molecular bonds, we discussed ions in solutions for the rest of class

• dissociation is the splitting of ionic solids into ions
• there are multiple steps you must follow in writing a dissociation equation
• determine the ions that are in your ionic solid and plit them up on the other side of the equation from your original solid
• write (aq) next to the ions to show that they are now aqueous due to the fact they are dissovled in water
• find the charge of each of the ions and write it
• balance the equation using the charge of each ions to determine how many of them there should be

we went through some concentration examples that go back to our stoichiometry section, so its basically using our old knowledge to kind of figure out new examples. I won't write out the examples bacause they would just be WAY too confusing using blogger. but instead, i have an awesome video! YAY!

it says 20 second but its more like a minute and a half. still, this does a really good job of explaining hydrogen bonding!

thats all for now!