Today we started with about an hour working limiting reactant problems from the packet.  I showed two other methods for finding the limiting reactant. Then I showed how to solve combustion analysis problems and you had about 10 minutes to work on textbook problems for this (3.16, 3.63, 3.103, 3.120).   Today’s notes. For the last 25 minutes of class you broke up into groups based on color of paper (one color per group) and then took turns explaining the math behind each of the methods.  Lastly you decided on procedures in your group – how much you will use, how long and how many times you will heat.  My requirements are that your final result give you 3 sig figs and that you have a reason for each procedural step.  I will provide a mixture that is between 25 and 80% sodium bicarbonate.

Video: Empirical Formula from Combustion Analysis (for AP! but there is a typo! The compound is not made of C, O and N, but C, H and N. On Youtube)

HW: Work on textbook and packet problems. Test is Thursday. We will review on Wed.


Today we did the determination of composition of a mixture lab. I also added on that you would dehydrate the alum crystals and see if you actually got a compound with 12 waters of hydration… This unfortunately took more than one class to complete =( so we continued with the lab on Wed.


Today you finished up both the determination of composition of a mixture and the alum crystals lab. Test was postponed to Friday B block.


Today you worked problems from packet and textbook in preparation for tomorrow’s test on stoichiometry.


Today you had until 10 am to study/ work practice problems and then we started the test on stoichiometry.

HW: Review molarity and dilutions.  Videos 2. b.1.2 and 2.b.1.5 Do #1 and 2 on page 2 of packet. Here’s more basic molarity practice if you need it.

Summer Science Opportunities:


For current high school juniors only: This is a fabulous program. Do not hesitate for your high school junior to apply. The online application deadline is October 30, 2016.

Here is the link for more information and to apply:  http://www.vasts.spacegrant.org/  .  Students get 2 free college credits for completing the online course. The top students are selected for the summer academy at NASA Langley and get 2 more free credits!

Here are a few videos made by students that attended our summer academies:


Week one 2016:    https://www.youtube.com/watch?v=MC82l-G8pig


Week one 2015:  https://www.youtube.com/watch?v=yunJ3iA6ZBc


Week 3 2013:  http://www.youtube.com/watch?v=iYkVlAVHxpc




For CURRENT 11th and 12 graders only:  VIRGINIA EARTH SCIENCE SYSTEMS SCHOLARS!!!  Click the link for more information and the application. The online application deadline is October 30, 2016.




The Virginia Earth System Science Scholars (VESSS) program is an interactive on-line science, technology, engineering and mathematics learning experience, highlighted by a seven-day residential summer academy at NASA Langley Research Center in Hampton, Virginia. Students selected to participate in the program are immersed in NASA-related research through interaction with scientists, engineers and technologists. The program is a partnership between the Virginia Space Grant Consortium and NASA Langley Research Center with assistance from Hampton University. The Virginia Earth System Science Scholars program propose to build on the success of the award-winning Virginia Aerospace Science and Technology Scholars (VASTS) program, a program which has offered dual enrollment credit, through TNCC, to over 2900 students since 2008.


VESSS 2016 Week 1: https://www.youtube.com/watch?v=psyxMvAGViM


VESSS 2016 Week 2: https://www.youtube.com/watch?v=lNGbVpA0g9w