Search found 10 matches

by Jared Faith 4E
Thu Dec 01, 2016 4:30 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Final 2012
Replies: 1
Views: 199

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...
by Jared Faith 4E
Tue Nov 22, 2016 9:02 pm
Forum: Conjugate Acids & Bases
Topic: Textbook Problem 12.37
Replies: 1
Views: 374

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 ...
by Jared Faith 4E
Thu Nov 17, 2016 3:32 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO Diagram for HF
Replies: 1
Views: 367

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...
by Jared Faith 4E
Thu Nov 10, 2016 4:18 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Drawing MO Diagrams
Replies: 3
Views: 555

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)
by Jared Faith 4E
Fri Nov 04, 2016 1:51 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order Conceptual Question
Replies: 1
Views: 193

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.
by Jared Faith 4E
Fri Oct 28, 2016 3:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tricks for Determining Shape
Replies: 1
Views: 183

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.
by Jared Faith 4E
Fri Oct 21, 2016 3:26 pm
Forum: Dipole Moments
Topic: Dipole Moment for Nonpolar Compounds
Replies: 1
Views: 139

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?
by Jared Faith 4E
Fri Oct 14, 2016 3:20 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy
Replies: 7
Views: 634

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...
by Jared Faith 4E
Fri Oct 07, 2016 3:42 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 90
Views: 7612

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.
by Jared Faith 4E
Thu Sep 29, 2016 8:52 pm
Forum: SI Units, Unit Conversions
Topic: Quiz preparation
Replies: 2
Views: 322

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...

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