Search found 21 matches

by sandyh9711
Sat Mar 12, 2016 2:10 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Naming
Replies: 2
Views: 632

Re: Naming

You also have to account for what gets priority when numbering. In the presence of functional groups, the function group gets first priority. Under the cases of normal substituents, the double or triple bonds get priority over the substituents.
by sandyh9711
Mon Feb 29, 2016 8:59 pm
Forum: *Cycloalkanes
Topic: Neo vs. tert
Replies: 6
Views: 720

Re: Neo vs. tert

If neo- is only for substituents with 5 carbons or more, are there any similar rules for iso-?

Ex. 1.16: the answer is 2-isopropyl-1,1-dimethylcyclopentane. Can the iso- become sec-?
by sandyh9711
Mon Feb 29, 2016 6:37 pm
Forum: *Alkanes
Topic: Condensed Structural Formula v. Substituents
Replies: 1
Views: 356

Condensed Structural Formula v. Substituents

Substituents are usually written in chemical formulas as within parentheses. Condensed structural formulas also have parentheses used. How do we distinguish what is within the parentheses as a substituent or part of the chain?
by sandyh9711
Mon Feb 29, 2016 4:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2016
Replies: 48
Views: 18760

Re: Quiz 3 Winter 2016

Do we have to memorize all the prefixes for alkane nomenclature, for instance, meth- for 1 carbon atom, prop- for 3 carbons, and all the way down to eicos- for 20 carbons?
by sandyh9711
Sun Feb 28, 2016 10:45 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Question 1.26- Why E instead of Z?
Replies: 1
Views: 270

Re: Question 1.26- Why E instead of Z?

In this problem, CH2CH3 and Br are the highest priority atoms and they are on opposite sides of the carbon double bond, so it is E. In order to identify the highest priority atom, we look at the first atom of each compound bonded to the carbon double bond. On the left side of the bond, CH2CH3 and CH...
by sandyh9711
Sun Feb 21, 2016 3:17 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: order
Replies: 3
Views: 422

Re: order

The overall order can also be determined by the units the rate constant is in (if it's provided). k varies according to the order of the concentrations.
by sandyh9711
Sun Feb 14, 2016 5:09 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics
Replies: 2
Views: 325

Re: Kinetics

In other words, molecularity is simply the number of reactants participating in a reaction.

For example, is unimolecular, whereas its reverse reaction, , is bimolecular.
by sandyh9711
Sun Feb 14, 2016 12:48 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2016
Replies: 18
Views: 6992

Re: Quiz 2 Winter 2016

The syllabus says to omit 15.9. Does that apply to the quiz too?
by sandyh9711
Mon Feb 08, 2016 11:53 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.15 (b)
Replies: 2
Views: 335

Re: 14.15 (b)

Will these equations be given to us, so we know what equations to base our work on?
by sandyh9711
Sun Feb 07, 2016 7:32 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Relationship between entropy and Gibbs free energy?
Replies: 2
Views: 2020

Re: Relationship between entropy and Gibbs free energy?

In addition, to what Austin said... If you're trying to see how entropy can affect spontaneity, you can consider looking at \Delta S_{tot}= \Delta S_{sys}+\Delta S_{surr} . In this case, you know that if \Delta S_{total} is positive, the reaction will be spontaneous and proceed towards the products....
by sandyh9711
Tue Jan 26, 2016 12:54 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Stability and Gibbs Free Energy
Replies: 1
Views: 497

Stability and Gibbs Free Energy

Question 9.81 asks which is the thermodynamically more stable iron oxide in air, Fe3O4(s) or Fe2O3(s)? Justify your selection. The solutions manual showed how to solve this process by joining the 2 compounds into a chemical equation with 4Fe3O4 + O2 --> 6Fe2O3. The Gibbs free energy of the reaction ...
by sandyh9711
Mon Jan 25, 2016 5:31 pm
Forum: Significant Figures
Topic: Problems don't have numbers
Replies: 1
Views: 640

Problems don't have numbers

What is the standard amount of significant figures to maintain if the problem doesn't provide any numbers?
by sandyh9711
Sun Jan 24, 2016 10:26 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Example
Replies: 2
Views: 429

Re: Gibbs Free Energy Example

I had the same question. In Ex. 9.16 of the textbook, when the question asked for estimating the temperature at which it is thermodynamically possible for carbon to reduce iron(III) oxide to iron under standard conditions by the endothermic reaction, delta G in the equation [delta G] = [delta H] - ...
by sandyh9711
Sun Jan 17, 2016 8:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Question 8.102
Replies: 1
Views: 355

Question 8.102

Please help with this question. I know it isn't listed in the homework, but doing proofs like in part a has always been hard for me. In Section 8.3 we saw how to calculate the work of reversible, isothermal expansion of a perfect gas. Now suppose that the reversible expansion is not isothermal and t...
by sandyh9711
Sun Jan 17, 2016 8:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: QUIZ 1 Material
Replies: 7
Views: 847

Re: QUIZ 1 Material

If we don't have the actual workbook, can we write out the questions and do them on paper instead?
by sandyh9711
Sun Jan 10, 2016 2:30 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW Question #8.111
Replies: 1
Views: 908

HW Question #8.111

Please assist with this problem. Crude petroleum is often contaminated by poisonous hydrogen sulfide gas. The Claus process for the extraction of sulfur from petroleum has two steps: 2H2S + 3O2 --> 2SO2 + 2H2O 2H2S + SO2 --> 3S + 2H2O Write a thermochemical equation for the overall reaction that...
by sandyh9711
Mon Nov 23, 2015 9:58 pm
Forum: Limiting Reactant Calculations
Topic: VIDEO:Limiting Reactant & Fundamentals Review
Replies: 3
Views: 502

Re: Limiting Reactant & Fundamentals Review Video

For those who want a youtube link, here it is:

https://youtu.be/0rXQ2cluOLo
by sandyh9711
Mon Nov 23, 2015 9:57 pm
Forum: Limiting Reactant Calculations
Topic: VIDEO:Limiting Reactant & Fundamentals Review
Replies: 3
Views: 502

Re: Limiting Reactant & Fundamentals Review Video

This is the video in another format- wma
by sandyh9711
Sat Oct 10, 2015 11:51 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Configuration sequence
Replies: 1
Views: 397

Electron Configuration sequence

I just wanted to confirm if this is accurate: According to what I have heard from the other discussion topics, the 4s orbital is first filled up and then the 3d, so 4s is written in front of 3d when 3d isn't filled yet. Once 3d is filled with electrons, 3d can be written in front of 4s. Is this true?
by sandyh9711
Sat Oct 10, 2015 11:42 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Energy Levels of d and s
Replies: 3
Views: 477

Re: Energy Levels of d and s

In response to Kelly, in this case I believe that the electron will be removed from the 4s subshell. the outermost shell.
by sandyh9711
Sat Oct 10, 2015 11:33 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Chapter 1 HW #57
Replies: 3
Views: 452

Re: Chapter 1 HW #57

I also had the same question regarding the problem, so according to what you are saying then, the values of the four lines are n=3, 4, 5, and 6. The 5th line is supposed to be n=7. What I don't understand however is that since you said n=2 is the ground state and also the 1st line, shouldn't the val...

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