Stoichiometry Test

Surprisingly, I thought the Stoichiometry test was pretty easy. I prepared a lot more than usual last night, which I think helped me out on the test today, especially doing the exam tickler practice that was available to me. However, I thought the last test was pretty easy and I did not do so well, so I'm still nervous as I await the results of this test. Anyways, the semester is pretty much over. I feel that I did a pretty good job in this class over the semester, but there's always room for improvement. I've heard that second semester is a lot harder than first, so I'll have to put a lot more time and effort into this class next semester, but I think I will be able to do fine.

http://www.protrainings.com/why_us/flexible

Iron Lab

The Iron Lab was a very interesting lab. First, we put a polished iron nail in a solution of water and Copper(II) Chloride in a baby food jar. Then, we let it sit overnight in order to let the entire reaction take place. The next day, we took out the nail and washed all of the copper off of it. Next, we drained the excess fluid from the jar of copper, then washed it with water. We repeated the draining process, then washed the copper again with HCl, and we drained it once again. then, we shook the jar a little bit in order to allow the solution to dry easier. We let the copper dry over the weekend, then took the mass of it today. The purpose of the experiment was to determine the theoretical and actual yield of Copper, and then to determine the percent yield of the Copper. This was a really cool lab!

https://en.wikipedia.org/wiki/Metallurgy_during_the_Copper_Age_in_Europe

Helpful Links:

Theoretical Yield

Theoretical Yield Video

Stoichiometry Weekly Quiz

The stoichiometry quiz was fairly easy in my opinion. It was mostly a lot of the basic information, so it wasn't very tricky. Although I got a 90% on the quiz, I'm not too worried about the test. I need to continue to do practice problems and remember all of the rules. Also, I need to work on the percent yield problems for the test because I missed the lecture over the percent yield portion of this chapter. I need to do well on this test, so I am going to have to work hard to get the grade that I desire!

http://www.samfunnetiaas.no/en/quiz/

Helpful Links:

Percent Yield Explanation

Percent Yield Video

Stoichiometry Intro

Unfortunately, there wasn't a pretest for this unit. I actually like taking pretests because they help me see what's going to be on the unit before it usually starts. The pre tests also have some of the same questions as the post test so it is beneficial to me. Anyways, the first stoichiometry lecture was pretty easy. Most of it consists of conversions. You have to convert the initial mass to moles, then compare that the the moles of the other substance, and finally change that to grams in order to solve the problem. Hopefully the rest of the unit is as easy as this part!

https://www.tes.com/lessons/Dd1iN2u2z62JUQ/stoichiometry

Helpful Links:

Stoichiometry Video

Stoichiometry Help

Chemical Reactions Test

The chemical reactions test was fairly easy for me. I spent a lot of time last night looking over my notes and doing practice problems, which really benefited me, as there were many similar questions on the practice and on the test. The test was over all types of reactions, driving forces, solubility rules, oxidation numbers, the reactivity series and a few other topics. For the most part, the questions were easy, but there were a few hard questions for me, as I had not seen questions like that before. However, I think I successfully worked my way through the harder questions, and I think that I achieved an A on this test.

http://science.pppst.com/chemicalreactions.html

Helpful Links:

Chemical reactions Video

Chemical Reaction Metals Lab

In the Metals Lab, we combined different metals with aqueous solutions in order to see if the chemicals reacted. The main purpose of the lab was to demonstrate Redox reactions, as that is what we have been learning in class. Also, we created our own reactivity series based on the results of which elements reacted most often. In our experiment, Calcium was at the top of the reactivity series, for it reacted with every chemical that it was placed in, meaning that it had the highest probability of reacting with other elements. Lead, however, reacted with none of the chemicals it was placed in, so it was placed at the bottom of our reactivity series. This lab was fun to complete, for the reactions that we saw were interesting to see.

http://www.kgs.ku.edu/Hydro/GWtutor/Plume_Busters/remediate_refs/redox_chemistry.htm

Helpful Links:

Redox Reaction Help

Activity Series Help