Stoichiometry 4

Recently in class, we dug out some old information from the Aspirin Lab we did a while ago, and used it to apply to this unit by calculating the percent yield of the reaction from the lab. The balanced chemical reaction that we began with was:

C7H6O3(s) + C4H6O3(aq) --> C9H8O4(s) + C2H4O2(aq)

Stoichiometry 3

The exam for the Stoichiometry unit is soon. In this unit, we have learned about what a limiting reagent is and how to identify and calculate its mass based on the mass of the other reactant. We also learned about how to calculate theoretical yield and how that contributes to percent yield. Based upon what we have learned as well as the last quiz we took, I feel that the test will be moderately difficult. Luckily, the test is only twelve questions.

Stoichiometry 2

Today in class, we finished up the Iron Lab. In this lab, we placed a nail in a baby food jar filled with Copper Chloride. We let it sit for a few days, and then we took the mass of both the baby food jar (now with the resulting solid copper) and the nail. This lab relates to what we've been learning in class because after the lab, we had to calculate theoretical yield and percent yield.

Stoichiometry

Today was our Stochiometry weekly quiz #1. I have the formulas down, but for some reason my answers didn't turn out right all the time. Did anyone else have that problem or is it just me? Just in case, if anyone might need these, here are some helpful websites regarding Stoichiometry.

Chemical Reactions 5

In this upcoming week, we will continue to learn about the different types of chemical reactions. Since the beginning of this unit, we have learned about double-replacement reactions that form a solid, acid-base reactions that form water, and RedOx reactions that result in the transfer of electrons. Since the exam is on Thursday, it is doubtful that we will learn much more in this unit, so hopefully I can use my time wisely this week and make sure I know the material to the best of my ability.

Chemical Reactions 4

Last week in class, we learned about several different types of reactions to prepare for the unit test that we took on Thursday. The type that we spent the longest time learning about were redox reactions. This stands for reduction and oxidation. During this type of reaction, electrons are transferred from a metal to a non-metal. If a species loses electrons, it is oxidized and is the reducing agent.

Chemical Reactions 3

This past week in class, we learned about acid/ base reactions. The driving force of these reactions is water, and they always produce a salt and water as products. We also learned about strong and weak acid and bases:

Strong Acids:
-Produe H+
-Protonate completely
-HCl, HBr, HI
-If oxygens outnumber hydrogens by 2 or more

Strong Bases:
-Contain an OH- anion
-Disassociate completely
-All group 1 and 2 metals and the -OH anion