Unit 10, Day 1

Today’s class started off on a very interesting note. As I walked into class, I saw that Mr. H had lighted something on fire…surprising. But, weirdly enough, it was WATER that was on fire! What a way to start a class.

This demo, obviously, pertained to the new unit we are starting today, SOLUTIONS!

But before I get ahead of myself, let me go over some other stuff that happened early in the period. Mr. H reminded us to look at our HomeLogic accounts to check out our grades for the unit 9 test. He then went on to say that we could come in to see him regarding our tests after school on Tuesday.

Mr. H then began to ease us into our new unit. He pointed out that there would be some major differences from the previous two units, namely that this unit was both conceptual and mathematical. He also let us in on a little secret, there would be an academic stimulus on our webassigns if they were completed at least 24 hours before the due date. He took this chance to say how we had a webassign due this very Wednesday, and to get a head start on it!

Now into the notes:

We opened up our lab notebooks and took some notes on Solubility.
A Solution is made up of: solvent + solute
(Usually more solvent) (Usually less solute)

An Aqueous solution is made of: Solvent (aka H2O) + Solute (aka a Solid)
3 STEPS TO DISSOLUTION:
1. Solute’s intermolecular forces break apart
2. Solvent’s intermolecular forces break apart
3. Attractive forces between solute and solvent are formed

Then we watched a YouTube video:


After that, we went on to page 9 in our new packets. Here are the answers

1. A-B attractions becuase the readily dissolved which means they have attractive forces
2. A-A attractions becuase the didn't dissociate in B, therefore they have no attraction
3. i. Endothermic (uses energy)
ii. Endothermic (uses energy)
iii. Exothermic (Just does it because they are attracted)
we skipped 4
5. Remember that for Polar Covalent, the Delta EN is greater than or equal to .4 and less than or equal to 1.7
a. Polar Covalent b. Non-Polar Covalent
c. Ionic d. Polar Covalent
e. Polar Covalent f. Polar Covalent
g. Ionic h. Non-Polar Covalent

Page 10
6. six is a review from last chapter, about things that we should know how to do
water is Yes/Yes Carbon disulfide is No/No Thiocynate is Yes/Yes
Ammonia is Yes/Yes Carbon tetrachloride is Yes/No Dichloromethane is Yes/Yes

7. Like Dissolves Like:
means that Polar solvents ONLY dissolve in polar solutes (and Ionic) &
non-polar solvents ONLY dissolve in non-polar solutes

8. Seven is used to answer questions from 8
a. polar/ dissolves in water (because water is polar!!!)
b. nonpolar/ doesn't dissolve in water (because CH4 is nonpolar!!!)
c. polar/ dissolves in water
d. nonpolar/doesn't dissolve in water
e. ionic/dissolves in water
f. nonpolar/doesn't dissolve in water
g. nonpolar/doesn't dissolve in water
h. polar/ dissolves in water

And that was our day in CHEMISTRY!