Energy Unit Test

We all did good!

After taking the test I felt confident I did good. I think I only missed 1. There were like 2 or 3 tricky ones that seemed foreign to me, but I went to Mrs. Frank after the test and I got them right! I think pretty much all of her classes did good which is always good. Now we only have 1 more unit to tackle before the end of the year!

How I feel I did

Specific Heat of a Metal Lab

We did a lab to measure the specific heats of copper and lead by heating the metals in a hot water bath and figuring out the variables for MCAT. Overall Liesel and I were sastified because we yielded only a 4% error. Now for Dylan Kossl I can't say he yielded a good percent error *cough cough* like 120% error *cough*. Here is a video of our test tube making a popping sound. 

Here is some pictures of the copper in the test tube.

Side view

Top view

First Lecture On Energy

Energy equation

Today we learned about energy change in the form of heat- heat released as a result of a reaction, or heat released as a reaction proceeds. The energy actually comes from after the bonds are broken, when the bonds are reformed. Whenever energy leaves a system it is called exothermic and whenever energy enters the system it is called endothermic.                                                                

Endothermic Reaction

Exothermic Reaction

Mrs. Frank also specified that we can't just stick a thermometer into a system, so whenever we read the temperature we are reading the temperature just outside the system. She introduced to us the equation of Q = mcΔT which we then put into practical use and calculated energy resulting after bonds have reformed. Overall I thought it was very easy. I am going to practice a few problems tonight just to make sure I have it down.