Search found 23 matches
- Sun Mar 19, 2017 11:28 am
- Forum: *Alkenes
- Topic: Cis/ Trans
- Replies: 4
- Views: 4039
Re: Cis/ Trans
Only if there is multiple double bonds.
- Wed Mar 15, 2017 10:26 am
- Forum: *Alcohols
- Topic: What type of alcohol?
- Replies: 1
- Views: 1234
Re: What type of alcohol?
The classification of an alcohol is based on the classification of the carbon it is covalently bonded to. For example, the carbon you outlined in purple is a tertiary carbon because it forms 3 carbon-carbon bonds. Thus the alcohol group it is bonded to is a tertiary alcohol. An alcohol group can onl...
Re: Numbering
I believe you want to aim for the first number to be as small as possible opposed to a smaller sum of substituent numbers.
- Wed Mar 08, 2017 2:17 pm
- Forum: *Electrophiles
- Topic: Question Regarding Alkenes
- Replies: 2
- Views: 1290
Re: Question Regarding Alkenes
Also once the double bond is broken, a single bond remains and a single bond must always be a sigma bond.
- Tue Feb 28, 2017 12:22 pm
- Forum: *Alkanes
- Topic: Name the compound
- Replies: 4
- Views: 936
Re: Name the compound
The two after the first (CH3) indicates that two methyl groups are attached to the first carbon in the chain.
- Mon Feb 27, 2017 8:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz number 3
- Replies: 5
- Views: 1195
Re: Quiz number 3
From the practice quiz, it seems that it will only cover organic chemistry, but I am not 100% sure.
- Mon Feb 27, 2017 8:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Intro to OChem Textbook?
- Replies: 2
- Views: 535
Re: Intro to OChem Textbook?
All of our reading and problem material from now on will be in the Organic Chemistry Textbook, rather than the Chemical Principles textbook.
- Sun Feb 19, 2017 5:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 23561
Re: Quiz 2 Winter 2017
Does anyone know on the dates of the first and last lecture that will be covered on Quiz 2?
- Thu Feb 09, 2017 2:56 pm
- Forum: Balancing Redox Reactions
- Topic: Textbook Question 14.3 D
- Replies: 1
- Views: 357
Textbook Question 14.3 D
In the reaction
Cl2(g)--->HClO(aq)+Cl-(aq)
why does CL2(g) serve as both the oxidation and reducing agent since it is being reduced?
Thank you in advance!
Cl2(g)--->HClO(aq)+Cl-(aq)
why does CL2(g) serve as both the oxidation and reducing agent since it is being reduced?
Thank you in advance!
- Tue Jan 31, 2017 4:43 pm
- Forum: Phase Changes & Related Calculations
- Topic: Given quantities
- Replies: 2
- Views: 546
Given quantities
I just wanted to make sure we would be given quantities like the heat of fusion or sublimation of a substance if needed on a problem. For example, if we needed to calculate the energy needed to melt a certain quantity of ice, would we be given the energy needed to melt one gram or mole of H20.
- Thu Jan 26, 2017 1:41 pm
- Forum: Phase Changes & Related Calculations
- Topic: Derivations
- Replies: 21
- Views: 3320
Re: Derivations
From what I understand, Dr. Lavelle does the derivations in class so we can have a better understanding of where the equations we use come from. But if you would still like to study the derivations there is a set of link on the Chemistry 14B wesbite about common derivatives in chemistry, and it is v...
- Sat Jan 21, 2017 1:48 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: which bonds to break/form [ENDORSED]
- Replies: 2
- Views: 495
Re: which bonds to break/form [ENDORSED]
To answer the second part of the question on how you know which bonds to break and form, when using bold enthalpies you can take the opposite of the enthalpy of formation of all of the reactants and add this to the enthalpy of formation of the products. This is because breaking bonds in the reactant...
- Thu Jan 12, 2017 1:36 pm
- Forum: General Science Questions
- Topic: Intro to Organic Chemistry
- Replies: 9
- Views: 1884
Re: Intro to Organic Chemistry
I believe it is a supplemental material, like the course reader is now, for when we start learning Organic Chemistry later in the quarter.
- Tue Nov 15, 2016 12:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination numbers [ENDORSED]
- Replies: 1
- Views: 463
Re: Coordination numbers [ENDORSED]
No, the coordination number comes from molecules inside the coordination compound. So the Cl on the outside of the brackets would not be counted.
- Mon Nov 14, 2016 7:30 am
- Forum: Student Social/Study Group
- Topic: Quiz 3
- Replies: 2
- Views: 922
Re: Quiz 3
I think it is until page 136 in the course reader, can anyone confirm?
- Sun Nov 06, 2016 11:37 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Expanded Valence Shell Electrons
- Replies: 2
- Views: 858
Re: Expanded Valence Shell Electrons
Yes, an expanded octet just means that an atom can have more than 8 valence electrons, it does not limit the number of electrons, for example: PCl6 would be allowed with a phosphorous atom with an expanded octet to fit 12 electrons.
- Fri Nov 04, 2016 3:01 pm
- Forum: Hybridization
- Topic: Hybridization for expanded octets
- Replies: 3
- Views: 1771
Hybridization for expanded octets
What would be the hybridization for an atom with an expanded octet, for example the hybridization of P in PCl5? Would it be sp4? Or is that not permitted.
- Tue Nov 01, 2016 7:30 am
- Forum: Lewis Structures
- Topic: Determining Lewis structures
- Replies: 4
- Views: 960
Determining Lewis structures
When given the choice between drawing a Lewis structure that has the overall smallest formal charge or one that has a smaller charge for the central atom, which one is deemed more correct?
- Tue Nov 01, 2016 7:27 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar/nonpolar molecules
- Replies: 3
- Views: 897
Re: Polar/nonpolar molecules
Will we have to address the polarity of a molecule on questions? For example by noting them as cis- or trans- depending on whether the charges cancel?
- Tue Nov 01, 2016 7:24 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lewis Structures on the Midterm
- Replies: 2
- Views: 604
Re: Lewis Structures on the Midterm
I think Dr. Lavelle mentioned that we would not have to draw any VSEPR shapes and rather the Lewis Structure would be sufficient.
- Mon Oct 17, 2016 9:30 am
- Forum: Resonance Structures
- Topic: NO3 Partial Double Bond [ENDORSED]
- Replies: 2
- Views: 590
NO3 Partial Double Bond [ENDORSED]
In the example Lavelle did in class with the resonance structure of NO3, why would the partial double bond have a length of 1.5 bonds and not 1.33 since there are 3 N-O bonds that the extra bond length must be divided between?
- Wed Oct 05, 2016 9:42 am
- Forum: Properties of Electrons
- Topic: Atomic Spectra Requirements [ENDORSED]
- Replies: 3
- Views: 802
Atomic Spectra Requirements [ENDORSED]
For determining light emitted based on the wavelength, should we know just the range of wavelengths for visible light (400-700 nm), or also each specific colors range or the ranges of UV light etc.
- Wed Sep 28, 2016 4:32 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 32789
Re: All students read this sig fig post [ENDORSED]
So I've been wondering, what's so important about sigfigs? why does it matter how many numbers we leave after the decimal place? Significant figures are important in the answer to a chemistry problem so that our answer is as precise as it can be from the information given to us. If we do not round ...