Search found 28 matches
- Mon Mar 13, 2017 3:12 pm
- Forum: *Alkenes
- Topic: Naming an Alkene
- Replies: 1
- Views: 468
Naming an Alkene
Let's say the name of a certain Alkene is 1,2,3,4,5-pentamethylcyclopenta-1,3-diene. What is the use of using diene in this name? Is this name the same as naming it 1,2,3,4,5-pentamethylcyclopent-1,3-ene?
- Mon Mar 06, 2017 4:43 pm
- Forum: *Alkanes
- Topic: drawing line structures
- Replies: 2
- Views: 573
drawing line structures
Are there multiple ways of drawing the same, correct line structure?
Does it matter whether you start the first diagonal line from the top or bottom?
Does it matter whether you start the first diagonal line from the top or bottom?
- Mon Mar 06, 2017 4:42 pm
- Forum: *Electrophilic Addition
- Topic: Transition step
- Replies: 3
- Views: 1572
Transition step
Is the slow step in electrophilic addition always the first step or the step with the highest activation energy barrier?
- Tue Feb 28, 2017 2:16 pm
- Forum: *Alkanes
- Topic: Naming [ENDORSED]
- Replies: 93
- Views: 16330
Naming [ENDORSED]
How do you determine where to put the dashes within the name of the organic compound? I think there are several instances where you would use one, but I just wanted some clarification.
- Wed Feb 22, 2017 6:30 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Midterm Q4.C
- Replies: 2
- Views: 512
Midterm Q4.C
This question asks us to write the cell diagram notation for the redox reaction, and I was told the order didn't matter for the components of the cell. I put the anode on the left of the cell diagram and the cathode on the right, but the components of the redox reaction are apparently in the wrong o...
- Thu Feb 16, 2017 8:36 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3048715
Re: Post All Chemistry Jokes Here
Want to hear a joke about nitric oxide?
*(yeah I do)*
NO
*(yeah I do)*
NO
- Mon Feb 13, 2017 6:50 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 14.11 d)
- Replies: 2
- Views: 574
Re: 14.11 d)
O2 (g) --> OH- (aq) Basically when you look at this half reaction you want to try to balance the oxygens on both sides because there are two on the left and one on the right. You try doing this by doubling the about of OH-. Now you have... O2 (g) --> 2OH- (aq) Then you want to balance the hydrogens ...
- Tue Feb 07, 2017 12:27 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: What is n? [ENDORSED]
- Replies: 8
- Views: 1843
What is n? [ENDORSED]
Sometimes n represents the number of electrons in the half reaction, but other times it is the change in the moles throughout the reaction. Could it be either or is it really just one? If you are not told to find the half reactions of the redox equation, do you have to find them anyway to find n if ...
- Sun Feb 05, 2017 10:29 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3048715
Re: Post All Chemistry Jokes Here
Working in an electrochemistry lab seems to show great potential.
- Sun Feb 05, 2017 12:45 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 2
- Views: 421
Cell Diagram
When writing a cell diagram, I understand that the anode is written before the cathode, but in what order do the products and reactants have to be written? When do you use commas instead of vertice lines?
- Sun Feb 05, 2017 12:42 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Entropy
- Replies: 1
- Views: 468
Entropy
Why is it that at 0 K the entropy of a crystal becomes zero? What does this temperature have to do with the crystals structure?
- Tue Jan 24, 2017 4:40 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: change in entropy
- Replies: 1
- Views: 393
change in entropy
Hi.
If delta S of a reversible system= q(reversible)/T, then does that mean for an irreversible system -q(irreversible)/T? If so, why or why not. Don't really understand the logic behind this equation.
Thank you.
If delta S of a reversible system= q(reversible)/T, then does that mean for an irreversible system -q(irreversible)/T? If so, why or why not. Don't really understand the logic behind this equation.
Thank you.
- Tue Jan 17, 2017 4:09 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: units for enthalpy problems
- Replies: 4
- Views: 996
Re: units for enthalpy problems
When finding standard rxn enthalpy it doesn't really matter if you use KJ/mol or just KJ (pretty sure my TA confirmed in class that both can be used and in the course reader it uses just KJ sometimes when finding the standard rxn enthalpy), but what you do have to make sure is labeled in KJ/mole is ...
- Wed Jan 11, 2017 8:04 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Joke
- Replies: 28
- Views: 6383
Re: Chemistry Joke
Exothermic reactions?
I studied them before they were cool. Pshht
I studied them before they were cool. Pshht
- Mon Nov 28, 2016 11:26 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Response of Equilibria to Change in CR pg. 138
- Replies: 2
- Views: 469
Re: Response of Equilibria to Change in CR pg. 138
If H2 is decreased then the equation shifts to the left in order to go back to equilibrium. This is because if the H2 concentration in the reaction decreases, then the product side of the equation (NH3) must begin to dissociate more readily in order to increase the concentration of the reactants and...
- Mon Nov 21, 2016 6:00 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa and pKb
- Replies: 2
- Views: 606
pKa and pKb
Are pKa and pKb measured on a scale of 0 to 14?
Also, does smaller pKb indicate a more basic base and the same for an acid with its pKa?
Thanks
Also, does smaller pKb indicate a more basic base and the same for an acid with its pKa?
Thanks
- Mon Nov 21, 2016 5:55 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Why when given Ka = weak acid
- Replies: 7
- Views: 3777
Re: Why when given Ka = weak acid
We know this because if you had a strong acid, then the acid would dissociate completely in the reaction and there would be no more reactant left. Therefore, the dissociation constant (products/reactants) would have a zero in the denominator and is undefined. This shows why strong acids don't have a...
- Wed Nov 16, 2016 6:13 pm
- Forum: Naming
- Topic: Alphabetizing Ligands
- Replies: 4
- Views: 891
Re: Alphabetizing Ligands
I understand this rule, but for ligands with names that don't match their formulas like ammine and ethylenediamine, do you put the coordination compound formula in alphabetical order based on the name of the ligand or it's formula?
- Sat Nov 12, 2016 9:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Chem Equilibrium
- Replies: 3
- Views: 677
Chem Equilibrium
The Workbook practice quiz includes question that have not been covered in the first 4 pages of the equilibrium section of the Course Reader. Do we have to know these types of questions for quiz 3?
Lmk! Thanks!
Lmk! Thanks!
- Sat Nov 12, 2016 5:09 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MO Diagram [ENDORSED]
- Replies: 1
- Views: 335
MO Diagram [ENDORSED]
Will we have to draw diagrams for compounds that go past Pi(2p)?
- Sat Nov 12, 2016 5:02 pm
- Forum: Naming
- Topic: Polydentrites/Monodentrite [ENDORSED]
- Replies: 1
- Views: 440
Polydentrites/Monodentrite [ENDORSED]
What is the siginificance of something vein a Polydentrite as opposed to a Monodentrite?
- Thu Nov 03, 2016 12:37 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3048715
Re: Post All Chemistry Jokes Here
Cation
Cat-i-on
noun, Chemistry
1. An ion with a paws-itive charge.
2. A very cute ion.
Cat-i-on
noun, Chemistry
1. An ion with a paws-itive charge.
2. A very cute ion.
- Wed Oct 26, 2016 12:20 pm
- Forum: Lewis Structures
- Topic: Hallogens
- Replies: 1
- Views: 500
Hallogens
Do hallogens normally stick to the octet guideline when they're surrounding the central and surrounding atom(s)? Or does that change when it's a central atom?
- Thu Oct 20, 2016 9:23 pm
- Forum: Ionic & Covalent Bonds
- Topic: formal charge [ENDORSED]
- Replies: 4
- Views: 2128
formal charge [ENDORSED]
I understand the formal charge equation and how it's found for each atom, but what exactly is formal charge? And what is it used for?
- Mon Oct 10, 2016 11:23 pm
- Forum: Properties of Light
- Topic: QUIZ 1 [ENDORSED]
- Replies: 7
- Views: 1630
QUIZ 1 [ENDORSED]
Do we have to know the polyatomic ions for the quiz this week? Also do we have to know how to name compounds?
- Tue Oct 04, 2016 10:21 pm
- Forum: DeBroglie Equation
- Topic: Neutrons
- Replies: 4
- Views: 1000
Neutrons
Do neutrons act like electrons when they pass through a crystal? Meaning do they diffract and do they have wavelike properties?
- Tue Sep 27, 2016 4:27 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 4
- Views: 858
Re: Photons
OK thanks, so there's no colorations between the photons and the frequency, right? because one looks at light on a smaller scale and the other is on a bigger scale.
- Mon Sep 26, 2016 11:33 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 4
- Views: 858
Photons
So I understand that the intensity of energy is related to the number of photons present, but then why does the energy equation consider frequency (E=vh)?