CHEMISTRY COMMUNITY

Jared Faith 4E

When finding pH, you apply sig fig rules after the decimal place. For example in question 8, there are 2 sig figs in 0.0037 M solution and in Ka=4.3x10^-7, so there should be 2 sig figs in your answer, that is after the integer value for pH. So when you find the pH to be around 4 on the pH scale, yo...

Jared Faith 4E

I'm pretty sure it means to write the equation for the weak acid with water on one side and the acid's aqueous products on the other. So HClO2 would be: HClO2 + H2O <--> H3O+ + ClO2- and you would write the Ka expression for this equation. Then since ClO2- is the conjugate base, you would write the ...

Jared Faith 4E

I wasn't sure about this myself, but I looked it up online (I added a picture). Apparently since F's 2s orbital is so low in energy, it cannot bond with H's 1s orbital and remains below the H as a non-bonding orbital. I can see how this might make sense since F is the most electronegative atom and h...

Jared Faith 4E

You have to draw the more electronegative atom lower in the model because the more electronegative atom has lower energy levels. You do this when there are two different atoms (ex: oxygen and carbon). If it is two of the same atoms, they go on the same level. (ex: carbon and carbon)

Jared Faith 4E

You can use it to double check your Lewis structures and determine if you assigned the correct number of bonds between atoms. Bond order also makes it easier to visualize the relative stability of different bonds.

Jared Faith 4E

Does anyone have any useful tricks or ways to name the molecular shapes? I can name them by using the regions of electron density but I was wondering if anyone has any other fun shortcuts.

Jared Faith 4E

For Nonpolar compounds such as CO2, do we need to draw both dipole moment arrows to the partial negative charges even though they cancel eachother? Is there another way to show they cancel out?

Jared Faith 4E

You can use the general ionization energy trend from the periodic table to find which atom has less ionization energy. Ionization energy (IE) decreases as you move left and down the Periodic Table. You can also use the opposite and say IE increases as you move right and up the table. (I added a pict...

Jared Faith 4E

Grant Menke 1C wrote:Should we wait to round sig figs until the end of a calculation or round throughout?

Generally, we are supposed to wait to round sig figs until we are at the end of all calculations for a problem. Otherwise if we round throughout calculations, our final answers will most likely be innaccurate.

Jared Faith 4E

My TA Dimitri told us we should familiarize ourselves with the common polyatomic ions since we will most likely have to name compounds/ recognize them on quizzes and exams. He told us to google "common polyatomic ions" and some basic lists should pop up. I have had one of the charts open i...

CHEMISTRY COMMUNITY

Search found 10 matches

Re: Final 2012

Re: Textbook Problem 12.37

Re: MO Diagram for HF

Re: Drawing MO Diagrams

Re: Bond Order Conceptual Question

Tricks for Determining Shape

Dipole Moment for Nonpolar Compounds

Re: Ionization Energy

Re: All students read this sig fig post [ENDORSED]

Re: Quiz preparation