Energy and Phase Change Notes

Phase Diagram Practice

Heating/Cooling Curve Practice

Endothermic vs Exothermic Processes

Q=MCDeltaT

Intramolecular vs Intermolecular Forces

Phase Diagram Transitions

Heat Capacity of a Metal Lab

Last week we got to find out the specific heat capacity of a metal and we got to test lead's specific heat capacity. First we set up a hot water bath with a beaker on a Bunsen Burner. Then we took a test tube, weighed it, then filled it 1/3 of the way up with lead, and then weighed it again. We then subtracted the weight of the test tube from the weight of the test tube + lead to find the weight of the lead by itself. Then we added the test tube to the hot water bath and let it come to a boil and let it boil for 5 minutes. Then we took the test tube and poured the lead into a Styrofoam cup of room temperature water, while that was happening we measured how hot the water got when the lead was added. Then we used the mcat = mcat formula to determine the specific heat capacity of the metal.

hot water bath!

Put-Put Boats!

We get to put our biodiesel to use! Our next lab was to design a boat with a motor that uses biodiesel. We were supplied with the motor and we used our own biodiesel that we had made previously, so all we had to do was design the boat. We decided to use a half-in-half carton as our boat and the poked holed in the bottom for the motor to go through and then sealed the extra holes with duct tape. After fixing a few leaks our boat worked pretty well! If we got one of the 3 fastest times in our class we would get extra credit! Unfortunately that didn't happen but our boat made it down the track so we got full points!

Biodiesel Lab

Last week we got to make biodiesel! It was a pretty easy lab, we took excess fryer oil from Chick-Fil
-A and measured 135mL of it into an erlenmeyer flask, then we added 32mL of KOH to the flask. Then we took a the flask and added it to the hot water bath, and let it heat for 20 minutes while keeping the temperature between 45-55 degrees celsius. Once it had heated we took it out of the hot water bath and poured it into a plastic cup to sit overnight. The next day we filtered out the KOH to be left with just the Biodiesel.

Pouring in the KOH

Hot water bath!

Viscosity Test!

What is Biodiesel?

How to Make Biodiesel

How Biodiesel is used

Pros and Cons of Biodiesel

Diesel Fuel

Biodiesel Video

When we came back from spring break, we began our new unit, Biodiesel, and our first project was to make a video about the benefits of biodiesel and submit it to the American Lung Association for a contest. The first place winners get $1200! We haven't gotten the results yet but hopefully they like our video!


BIODIESEL VIDEO!!!

Bonding Test

I felt pretty good going into the chemical bonding test, not quite as confidant as I was about the periodic trends, but still better than I've felt about some other tests. I studied for a couple of hours the night before and found some pretty helpful links that helped me study.

Definition

Valence Electron Configuration Practice

Bond length 

Electron Dot Formula Practice

Bond energy

Bonding Practice