Redox Reactions

Redox Single Replacement:

• element + compound > element + compound
• driving force = transfer of electrons
• the metals change places
• "like attacks like" = metals attack metals, nonmetals attack nonmetals

Synthesis Redox:

• 2 or more reactants form one product 
• A + B > AB

Decomposition Redox:

• 1 reactant produces 2 or more products
• AB > A + B

Combustion Redox:

• when a hydrocarbon reacts with oxygen (O2), the product are ALWAYS H2O and CO2
• oxygen is always a reactant

Here are two videos on redox reactions:

https://www.youtube.com/watch?v=lQ6FBA1HM3s&feature=youtu.be&list=PL8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr

https://www.khanacademy.org/science/chemistry/oxidation-reduction/redox-oxidation-reduction/v/oxidizing-and-reducing-agents-1

Solubility Rules

Solubility rules have been hard for me to memorize. I still struggle with remembering some of the exceptions, but this video helped me a lot:
https://www.youtube.com/watch?v=AsCLuLS-yZY

There are a lot of little things to remember that will cause you trouble if you don't catch them. So here is an in-depth explanation:
http://www.chem.sc.edu/faculty/morgan/resources/solubility/

First Lesson

Chemical reactions sometimes get confused with physical changes. Some sensory details to know if something is a chemical reaction are...

• color change
• solid forms
• bubbles form
• heat/flame is produced or heat is absorbed
• ΔH is the sign to show temperature change, also called "enthalpy"

Below is the anatomy of a chemical reaction:

***don't forget about HOFBrINCl's!!!!

Here is a helpful video as well:

https://www.youtube.com/watch?v=AKiAjW7xHOc

Diatomic Elements

A small trick that many forget during this unit is diatomic elements. There are 7 of these that when they stand alone, their mass from the periodic table must be doubled. When they are a part of a compound, their mass from the table stays the same, though. This was one of the questions I missed on the quiz that I need to pay attention to on the unit test tomorrow.

Here is a link that explains it. In class, we learned the trick "HOFBrINCl" to remember the seven elements. This link says to think of "Have No Fear Of Ice Cold Beer", a less appropriate, but a more funny way to remember that may stick in brains better :)
http://chemistry.about.com/od/elementfacts/f/What-Are-The-Seven-Diatomic-Elements.htm

Empirical Formulas

Another part of this unit is empirical formulas. They differ from molecular compounds in that they are the lowest number ratio of elements in a compound that cannot be reduced. Molecular formulas would look something like C10H22 whereas empirical would look like C5H11. They can be the same if the molecular is reduced, though.



http://www.chemteam.info/Mole/EmpiricalFormula.html

Mole Conversion

Throughout this unit, we have become used to using this method of converting because it is the way to find all of the calculations for this topic. A lot of times, it is pretty straight forward, but other times it gets confusing. For example, there were a few questions on the weekly quiz that caused me trouble because they weren't as straight forward as the road map entails. I'm going to look over these types tonight to review for the test tomorrow which will probably have a lot.

Here is a link to the road map!

http://www.orschemistry.com/orspvchem1112/ChemHonors_files/moleroadmap.pdf

Formula of a Chloride Lab

Yesterday, we did the second lab for this unit, which is the formula of a chloride lab. We combined zinc and chlorine to form a zinc chloride compound. This happened by heating the zinc and chloride, evaporating the excess HCl in the liquid.


 
 

Formula of a Hydrate Lab

Today, we did the formula of a hydrate lab. I thought it was very interesting to get to take out the water from the CuSO4 ourselves with the Bunsen burner. I also thought it helped put the math part into better perspective because we got to experience it and come up with the data ourselves, so it helped me understand more.
Here are a couple pictures of mine and Bri's lab :)



Also, here are a couple references:
http://www.occc.edu/kmbailey/chem1115tutorials/Stoichiometry_Molar_Mass.htm
https://www.youtube.com/watch?v=xPdqEX_WMjo

Chemical Composition Pre-Test

We just took the pre test for this unit, which is chemical composition. Personally, although no one really knows what they're doing on pre tests, I think this was the hardest one. It seems like there is going to be a lot to remember and keep track of with a lot of intricate math that could get really confusing. It could be just me, but I think this unit is going to be tough.

Here's a couple videos that may help in the future!
https://m.youtube.com/watch?v=QcC4OsSxWYU
https://m.youtube.com/watch?v=Pft2CASl0M0

Also, here are two examples of chemical composition that are relevant to our lives: