Search found 10 matches
- Thu Dec 01, 2016 4:30 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Final 2012
- Replies: 1
- Views: 472
Re: Final 2012
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...
- Tue Nov 22, 2016 9:02 pm
- Forum: Conjugate Acids & Bases
- Topic: Textbook Problem 12.37
- Replies: 1
- Views: 1670
Re: Textbook Problem 12.37
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 ...
- Thu Nov 17, 2016 3:32 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MO Diagram for HF
- Replies: 1
- Views: 1861
Re: MO Diagram for HF
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...
- Thu Nov 10, 2016 4:18 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Drawing MO Diagrams
- Replies: 3
- Views: 4078
Re: Drawing MO Diagrams
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)
- Fri Nov 04, 2016 2:51 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order Conceptual Question
- Replies: 1
- Views: 443
Re: Bond Order Conceptual Question
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.
- Fri Oct 28, 2016 4:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Tricks for Determining Shape
- Replies: 1
- Views: 441
Tricks for Determining Shape
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.
- Fri Oct 21, 2016 4:26 pm
- Forum: Dipole Moments
- Topic: Dipole Moment for Nonpolar Compounds
- Replies: 1
- Views: 404
Dipole Moment for Nonpolar Compounds
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?
- Fri Oct 14, 2016 4:20 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energy
- Replies: 7
- Views: 1537
Re: Ionization Energy
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...
- Fri Oct 07, 2016 4:42 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 33863
Re: All students read this sig fig post [ENDORSED]
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.
- Thu Sep 29, 2016 9:52 pm
- Forum: SI Units, Unit Conversions
- Topic: Quiz preparation
- Replies: 2
- Views: 635
Re: Quiz preparation
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...