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

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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

Unit Test

Well... this test wasn't the best. It It stunk a lot more, than all of the rest. Learning the lessons never seemed too hard, but when I was through with the test it would leave my grade scarred. My preparation prior wasn't outstanding, this would lead to a rather rough landing. Oh when I first saw the test I knew it was bad, as I could feel this collection of papers making me sad. The majority of questions that went into my brain, got lost in there and caused some real pain. This exam resulted in a big fat F, and it's not like sports where I can blame it on the ref. A look on the bright side will reveal I can't possibly do worse than that, and you are probably thinking "Well duh! You did worse than my rat!". All I can do now is move forward with time, I hope you all enjoyed my sequence of rhyme.

Molecular, Complete and net Equations

We just learned about the three steps to chemical equations. Molecular is first, complete ionic is second, and net ionic is third and last. After figuring out your final product, or net equation, you can determine who your spectators are. It was generally a nice and easy lesson that was easy to comprehend. I feel fairly confident about doing these problems.

Additional Info on the Topic



Video on the three equations

Driving Forces

Today we learned about the very important driving forces. There are four categories of driving forces which are: formation of a solid, formation of water, transfer of electrons and formation of a gas. Two compounds will react if there is at least one driving force present. We then moved on to even more crucial lessons. Double displacement reactions are the backbone of this lesson and thankfully they aren't incredibly difficult. The simple equation for them is AB + CD -----> AD + CB







Double Displacement Reactions: Examples

Double Displacement Reactions Video

Starting Chemical Reactions

We began the unit learning about chemical reactions and it wasn't too shabby. I learned what endothermic and exothermic reactions are and how to classify chemical equations into them. That was pretty important and fairly easy. We then learned about the CHO Method which is a huge concept. It is neccessary for you to understand the CHO Method because it will be used quite often. Seems like it will be a pretty good unit.


CHO Method

Endo & Exo Thermic Equations