Search found 21 matches
- Sun Mar 12, 2017 7:01 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Question 4.30 in the organic chem book
- Replies: 2
- Views: 809
Re: Question 4.30 in the organic chem book
Yeah it could theoretically occur but it is just asking you to infer the most likely scenario
- Sun Mar 12, 2017 6:59 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Transition Steps
- Replies: 9
- Views: 2511
Re: Transition Steps
All bonds affected by arrows are shows as dashed
- Sun Mar 12, 2017 6:51 pm
- Forum: *Nucleophiles
- Topic: Ambident
- Replies: 3
- Views: 1398
Re: Ambident
I don't know if we will have to go to this extent on the final
- Sun Mar 12, 2017 6:48 pm
- Forum: *Electrophiles
- Topic: nucleophile vs electrophile
- Replies: 2
- Views: 1622
Re: nucleophile vs electrophile
OH- is a nucleaphile because it has three lone pairs that readily available to bond
- Sun Mar 12, 2017 6:47 pm
- Forum: *Electrophiles
- Topic: Nucleophile vs Electrophile
- Replies: 7
- Views: 2777
Re: Nucleophile vs Electrophile
Nucleophile is simply a fancy way of saying -- molecule that has a lone pair to bond with a molecule that needs an electron. Electrophile is a fancy way of saying-- molecule that needs an electron. Cl to Cl- is something you can remember from 14a
- Sun Mar 12, 2017 6:35 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst that is used and produced
- Replies: 4
- Views: 834
Re: Catalyst that is used and produced
Well the more catalyst, the more reactant it can catalyze. A lot of enzyme use surface area, moree enzyme means more surface area
- Sun Mar 12, 2017 6:32 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Relationship between activation energy and pseudo delta g
- Replies: 2
- Views: 2300
Re: Relationship between activation energy and pseudo delta g
Your confusion may strain from the fact that the deltaG is taken from reactant to maxima of a TS while Ea is first from reactant to TS1 in a two step and then from the intermediates to TS2. deltaG disregards the intermediates as a starting point of measurement
- Sun Mar 12, 2017 6:26 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: ch15 #51
- Replies: 3
- Views: 669
Re: ch15 #51
Yes, as the questions on the Quizzes, the slow step governs the entirety of the reaction. When you see a reaction that is slow then fast, ONLY look at the slow step to determine rate law. Nice general rule
- Sun Mar 12, 2017 6:22 pm
- Forum: First Order Reactions
- Topic: Determining Overall Reaction Rate
- Replies: 3
- Views: 765
Re: Determining Overall Reaction Rate
Such as when given a question regarding a table of values (COncentrations, Rates, Etc.) and you are asked to find the order of each substance and the overall order. It is important to remember to add the overall exponents at the end to find overall rate. Each individual order only relates to the spe...
- Sun Mar 12, 2017 6:19 pm
- Forum: Zero Order Reactions
- Topic: Units [ENDORSED]
- Replies: 7
- Views: 1879
Re: Units [ENDORSED]
Divide by Molarity for each order essentially
- Sun Dec 04, 2016 2:21 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: homework question 13.5
- Replies: 1
- Views: 877
Re: homework question 13.5
NaCl has no effect because the Na and Cl are salts of a strong acid and strong base
- Sun Dec 04, 2016 2:16 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: 2014 final #8
- Replies: 2
- Views: 965
Re: 2014 final #8
A higher pH corresponds to a higher amount of base as shown
- Sun Dec 04, 2016 2:14 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Significant Figures for pH
- Replies: 1
- Views: 1030
Re: Significant Figures for pH
the sig figs for pH is the total like as in the 12 in 12.34. that is always unaffected. Starting with the decimal point, it is the number of sig figs in the value that was log'ed. so as log(2.73 ×10–5) = –4.564. The 2.73 is three sig figs for there must be three sig figs after the decimal point.
- Mon Nov 14, 2016 8:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Do we include (aq) in equilibrium equation?
- Replies: 3
- Views: 846
Re: Do we include (aq) in equilibrium equation?
The K equation deals with concentrations and as such aqueous solutions consist of dissolved solutes which can change in concentration unlike a solid group of atoms which cannot change in concentration
- Mon Nov 14, 2016 2:42 pm
- Forum: Ideal Gases
- Topic: Chemical equilibrium
- Replies: 4
- Views: 1120
Re: Chemical equilibrium
Yes, the aspect of equilibrium can be disturbed or altered momentarily as noted in Le Chatelier's Principle:chemical principle that states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components, the system will t...
- Mon Nov 07, 2016 1:09 pm
- Forum: Hybridization
- Topic: Hybridization for the midterm
- Replies: 2
- Views: 658
Re: Hybridization for the midterm
Yes you need to know that hybridization only deals with regions of density as hybridized orbitals only encompass sigma bonds and lone pairs
- Mon Nov 07, 2016 1:07 pm
- Forum: Hybridization
- Topic: Which Hybrid Orbital
- Replies: 6
- Views: 1100
Re: Which Hybrid Orbital
Yes remember that the double and triple bonds include pi bonds which aren't shown in the hybridized orbitals which only illustrate sigma bonds and lone pairs
- Sun Oct 23, 2016 3:17 pm
- Forum: Resonance Structures
- Topic: Resonance Structures-More Stable
- Replies: 2
- Views: 741
Re: Resonance Structures-More Stable
It's not the ability to draw the structures-- that's just a formality because we are operating in a 2-D sense. In reality the resonance means that each bond among the plausible options is the same length (as in the double bond is distributed throughout the options making the total molecule more stab...
- Mon Oct 17, 2016 9:20 am
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Chemical Equation
- Replies: 2
- Views: 511
Re: Ionic Chemical Equation
Therefore, the number in parentheses denotes what types of bonds the metals can make. For instance, Copper can be Cu(i) or Cu(ii). Cu(i) can give in one electron from a nonmetal as it is Cu1+ while Cu(ii) can give two electrons as it is Cu2+. Thus Cu(i) can form a bond like Cu2O while Cu(ii) can sim...
- Fri Oct 07, 2016 1:03 am
- Forum: Einstein Equation
- Topic: Preparatory quiz [ENDORSED]
- Replies: 3
- Views: 892
Re: Preparatory quiz [ENDORSED]
Please explain how to do the question #10 on the first preparatory quiz. Alright so we are referring to "An excited hydrogen atom emits light with a frequency of 1.14x10^14 Hz to reach the energy level for which n = 4. In what principle quantum level did the electron begin?" If yes, then ...
- Fri Sep 30, 2016 11:10 am
- Forum: Properties of Light
- Topic: Increasing Intensity in Photoelectric Effect [ENDORSED]
- Replies: 9
- Views: 2190
Re: Increasing Intensity in Photoelectric Effect [ENDORSED]
I had the same question, but reading this post definitely helped! Also during that same lecture on 9/28, when going through the worked example in our Course Readers I was confused on where the values for "h" and "c" came from. We were trying to calculate energy and wavelength of...