We first started class off today by being told by Mr. Lieberman that we will not be doing our lab today, but we will be doing it on Monday instead.
Next we went over our pre-lab. I want to thank Matt P. with some help from Ben A. for explaining to us how to answer each question. Here is how to do them:
1) Make an equation to help find the pressure of hydrogen: 19.8+x=746 and when you solve for x you get 726.2 mmHg of H2.
2)Use your answer from #1 and you will make an equation following the form of PV/T=P2V2/T2. The equation is 726.2(31)/295=760V/273. Solve the equation for the volume of hydrogen at STP and you should get .274 L.
3)This is just a simple stoich problem: .028g Mg x 1 mole Mg/24.3g x 1 mole H2/1 mole Mg =.001167 moles of H2
4) Use your answers from numbers 2 and 3 to get the molar volume of hydrogen at STP: .274/.001167 = 23.5 L/ 1 mole.
Next, after going over the pre-lab, we continued going over notes. The main thing we talked about in our notes is that there are three equations that come from the equation PV=nRT. Those three equations are:
-PV=(g/mm)RT
-mmP/RT=g/v and g/v equals density
-mm=DRT/P~ a way is to remember this is dirty pee...get it..
Also, a reminder, make sure you are keeping up with your worksheets which are due on the day of the test which is on Friday, the day before break.
Then we did an awesome experiment that we were actually able to eat. We made chocolate ice cream! The ingredients were sugar, milk, whipping cream, chocolate syrup, and what made the magic happen, liquid nitrogen. It was and looked a little clumpy, but it actually tasted really good. And that was the end to another good day in chem.
The next scribe will be......Kaitlin Y!
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