Murder Investigation Molarity Lab

This lab was just stupendous. I found it much more enjoyable than other labs due to the fact that this lab came with a backstory and a mystery to figure out. It makes the experiment more engaging and intriguing since we have something extra to discover. We did a great job throughout the lab and felt pretty confident with our choice of the culprit for Mrs. Scarlet's death. We figured this out from calculating the molarity of an unknown fatal substance. I hope we have more labs like this in the future.

http://www.chemtech.org/cn/cn206/images/5-molarity.gif

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More Molarity

Crime Scene Investigation Guide

Identifying an Unknown Substance

First Lesson of the New Year

This lecture was fairly smooth. I feel like I had a pretty good understanding of the lesson. The lesson was titled "Using Molarities in Stoichiometric Calculations" and it began with a very helpful flow chart. A key point that really helped me was the concept of "want/have" or "what you want over what you have". That concept really helped me through the first example and simplified the lesson. After that we learned two new key terms: endpoint which is the moles of acid = moles of base, and titrate= acid base reaction.

Stoichiometry & Reactions

Using Molarity in Calculations

Helpful Video Based on the Lesson

http://2012books.lardbucket.org/books/introduction-to-chemistry-general-organic-and-biological/section_09/ea1d4940033105bd3e47086d18eb745a.jpg

 

 

 

 

 

 

http://2012books.lardbucket.org/books/principles-of-general-chemistry-v1.0/section_08/39d6d188709bfb7c4d18e1acfa53bead.jpg

https://figures.boundless.com/14274/full/slide2.jpe

First Lab of 2016

This lab was fairly easy. We picked our choice of food coloring as blue. Then we put that food coloring into a small cup and kept on extracting a sample of the previous solution and adding it with water. This caused the color to eventually disappear.

Stoichiometry Test and Iron Lab

Before we took the unit test, we did the Copper Chloride and Iron Lab. This lab consisted of adding Copper Chloride to an iron nail and watching how it transformed the mass of the nail. The copper chloride quickly rusted the nail, and left it around 1 gram lighter in mass. We then had to figure out if we used an iron nail that was 3+ or 2+ . Ours ended up being 3+. The real focus here is the test though. Once again I felt somewhat confident coming into the exam, but once I start the test I just seem to forget everything. I don't think it's possible to get a worse score than I did on the last unit test. I am nervously awaiting the results.

Last Lecture Of Stoichiometry

In the final lesson of Stoichiometry, we learned about percent yield. The formula was: % Yield = 100 x Actual Yield / Theoretical Yield. It was fairly simple and easily comprehended. It was also a very short lesson, given how easy it was supposed to be. Now I have to prepare for our test, and I'm feeling a bit better about this one then the last one. This is also our last unit before the semester ends which is exciting. 

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Helpful Information and Examples

Practice Problems

Help For the Whole Lesson in General

http://www.wikihow.com/images/0/0a/Calculate-Percent-Yield-in-Chemistry-Step-13.jpg

Different Approaches

Using the lecture supplements again, we learned of 2 different approaches to finding the limiting reagent. In approach 1, you look at the number of moles of each reactant. This approach seemed to take a little longer and was a little more confusing. In approach 2, you calculated and compared the amount of product each reactant will produce. This approach was much more simple and faster. After doing some practice problems, the lecture was pretty smooth.

Additional Help With Finding the Limiting Reagent

Great Information on Limiting Reagents 

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First Day of Stoichiometry

This lecture was a bit different because we use lecture supplement sheets that our teacher gave us instead of copying down a million notes in our notebook. I really prefer this note taking method over the old one. We learned about the backbone of stoichiometry. How you have to use the molar mass of substance A then use the coefficients of A and B then use the molar mass of substance B. It was a goof lesson that I understood pretty well.


Additional Info and Help with Stoichiometry