Stoichiometry Afterthoughts

Blog Post #4

(December 15, 2015)

After taking the test today, I felt as I knew what I was doing. The worksheets had provided immense amounts of help and I felt confident in most of my answer choices. Although I had a slight struggle with at most three questions, I felt I knew what I was doing and could actually turn in my test without feeling like a nervous wreck and on the verge of a mental breakdown. 

Links I used to help study:

ChemWiki-Stoichiometry and Balancing Equations

Baby Food Jar Lab

Blog Post #3

(December 15, 2015)

Recently in class, we conducted a lab where we had to calculate theoretical yields. We were given a nail, (Fe) and Copper (II) Chloride (CuCl2) and had to calculate if our final mass was more of Fe(II) or Fe(III). 

 Day One: All we did was take the measure of the baby food jar, the nail, the copper (II) chloride and recorded it on a data table. 

Day Two: We came into school the next day and saw that we had produced copper! We extracted our nail and had to go through many different processes of siphoning off liquids multiple times. We then measured the mass of the nail that was used and recorded it.

Day three: After the weekend all we had to do was calculate the actual mass of copper that we had produced and see which Iron it was closer too. 

The nail after decomposing

Our copper in the solution

Calculating Percent Yield

Blog Post #2

(December 25, 2015)

Our next lesson we learned in stoic. was the calculation of theoretical/percent yield.

In order to find the theoretical yield, you have to take both of the reactants you are given and put both of them through the five-step equations. The reactant that has the lowest number of grams produced is your limiting reagent. And your limiting reagent is also your theoretical yield, meaning that you can only produce a certain amount of grams. 

In order to find percent yield, you take the actual amount of grams you produced, and divide that by the theoretical yield you had just figured out. You then take that number and times it by 100. 

http://www.800mainstreet.com/6/0006-007-percenty-defsm.gif

Extra Help:

Theoretical and Percent Yield

How To Calculate Theoretical Yield

The Basis Of Stoichiometry

Blog Post #1

(December 15, 2015)

Trying to cram in a last minute unit I thought was going to be too difficult with how close our finals are compared to the unit exam. 

However, this unit was fairly easy.

Stoichiometry took our last unit of chemical reactions, and combined it with math. 

There are five steps on how to solve a basic mass to mass conversion.

1. Write a balanced equation for the reaction, (if not already balanced).

2. Write the given mass on a factor-label form.

3. Convert mass of reactant to moles of reactant.

4. Convert moles of reactant to moles of product. 

5. Convert moles of product to grams of product.

*Use the road map when certain questions ask for how many particles, or how many moles.

http://3.bp.blogspot.com/-a2r-9MArfeE/U1WV60FeXXI/AAAAAAAAADg/s_Df-ogFKig/s1600/Stoichiometry%2BMole%2BTunnel.png


Extra Help:


Khan Academy-Stoichiometry and Chemical Equations