CHEMISTRY COMMUNITY

Natalie_Boyd_1C

I'm just going to go over this page generally and if you have any more questions I'll try to answer them as best as I can. Things to know: 1. A straight arrow indicates a reaction, while a curved arrow indicates the movement of electrons a. Where the arrow starts is the source of the electrons, whil...

Natalie_Boyd_1C

Natalie_Boyd_1C

Natalie_Boyd_1C

We've talked about which direction a reaction will go based on the concentrations given (i.e. we've talked about le chatelier's principle), and so now we're exploring how the speed of the reaction changes by changing the concentrations of the reactants. A rate law mathematically describes how the co...

Natalie_Boyd_1C

Natalie_Boyd_1C

The easiest way to do this problem is to cancel out bonds on the two sides of the reactions. What you're looking to do is to look only at what is new: which bonds are being broken, and which ones are being formed. All bonds that are formed release energy. This is because the molecule goes to a lower...

Natalie_Boyd_1C

Natalie_Boyd_1C

If you need a refresher on determining oxidation numbers: http://www.wikihow.com/Find-Oxidation-Numbers I'm just going to do the whole problem in case someone else doesn't understand why Cl2 is being reduced as well. EQ: H2S(aq) + Cl2(g) --> S(s) + Cl^(-)(aq) First, let's determine all of the oxidat...

Natalie_Boyd_1C

: 20150119_195957_.jpg (19.33 KiB) Viewed 39785 times

Natalie_Boyd_1C

I've never had him either, but... this might help. Thus far, the equations we have used are: enthalpy: 1.definition of enthalpy: delta H= q p = 2. delta H= H products - H reactants -->Phase Changes: 3. enthalpy of vaporization: delta H vaporization = H vapor - H liquid 4. enthalpy of fusion: delta H...

Natalie_Boyd_1C

I find that the course reader is a good way to enhance what you absorb in lecture. I.e. it makes taking lecture notes easier because you're not scrambling to write everything down. If you don't have that problem, though, you probably do not need a course reader, although I personally find it pretty ...

Natalie_Boyd_1C

I think you probably need to draw a Lewis dot structure to figure out what bonds a molecule has, unless you memorize the bonds for a particular molecule. I.e. you probably don't have to draw a Lewis structure for O2, because it's been drawn a lot in class, and we know it has a double bond.

Natalie_Boyd_1C

Some of the products and reactants get canceled out because they are used up in the reaction. The example the course reader uses for Hess's Law is: N2 + O2 ---> 2NO + 2NO + O2 ---> 2NO2 2NO is the product of the first equation, but it is the reactant of the second equation. The second reaction basic...

Natalie_Boyd_1C

I've never had Prof Lavelle before. In the syllabus it says that there is 1 point per week for something called "Weekly Online Discussion". What is that and how do I do it?

Thanks!

CHEMISTRY COMMUNITY

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Weekly Online Discussion