Search found 21 matches

by Swati_Sharma_2D
Fri Mar 17, 2017 6:46 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Electrophilic addition and Sn2
Replies: 1
Views: 319

Re: Electrophilic addition and Sn2

Hi,

The other difference is if you look what is being reacted. If a compound is being reacted with an electrophile, then it is electrophilic addition. If a compound is being reacted with a nucleophile, it is an SN2 reaction.
by Swati_Sharma_2D
Mon Mar 13, 2017 8:21 pm
Forum: General Rate Laws
Topic: Difference between equilibrium constant and rate constant
Replies: 1
Views: 2082

Re: Difference between equilibrium constant and rate constant

The equilibrium constant, K eq is the ratio of the equilibrium concentrations of the products over the equilibrium concentrations of the reactants. This is if you are given a chemical equation and the concentrations could be in molars or sometimes in partial pressures. The rate constant, k, is used ...
by Swati_Sharma_2D
Sun Mar 12, 2017 7:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019875

Re: Post All Chemistry Jokes Here

What is the molecule CH2O called? Seawater!
by Swati_Sharma_2D
Tue Mar 07, 2017 10:01 pm
Forum: *Alkenes
Topic: cis and trans
Replies: 1
Views: 280

cis and trans

Are the cis and trans labels only used for alkenes or are they also required when naming alkanes and alkynes?

Thanks!
by Swati_Sharma_2D
Mon Mar 06, 2017 12:49 am
Forum: *Organic Reaction Mechanisms in General
Topic: Nucleophile strength
Replies: 2
Views: 288

Re: Nucleophile strength

Hi,

I would say that one of the main reasons OH- is more nucleophilic is the fact that it has an overall negative charge, which signifies that it can more easily attract positively charged atoms than water which does not have an overall negative charge.
by Swati_Sharma_2D
Thu Feb 23, 2017 4:56 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.61
Replies: 3
Views: 377

Re: 15.61

Hi,

I'm not sure why it is like that in the course reader, but if you follow the actual formula where the temperature part is written as (1/T1 - 1/T2) you will get the same answer that is in the course reader.
by Swati_Sharma_2D
Wed Feb 08, 2017 10:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Conductors
Replies: 1
Views: 255

Re: Inert Conductors

Hi, An inert electrode (usually Pt) is used when there is a gas/ion electrode reaction. When you separate the main equation into the cathode and anode reactions, you have to see if there are only gases and ions present. If that is the case, then an inert electrode has to be used. If there is a solid...
by Swati_Sharma_2D
Sat Feb 04, 2017 4:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019875

Re: Post All Chemistry Jokes Here

Do you have any sodium hypobromite?

NaBrO.
by Swati_Sharma_2D
Sun Jan 29, 2017 2:46 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW Ch. 8 #27
Replies: 1
Views: 223

Re: HW Ch. 8 #27

Hi,

For part b you should use the W = -nRTln(v2/V1).
You first have to use the ideal gas law PV = nRT to find the number of moles and then you can use the above formula. That should get you the correct answer.
by Swati_Sharma_2D
Sat Jan 21, 2017 10:35 pm
Forum: Phase Changes & Related Calculations
Topic: Homework chapter 8 #3 part a [ENDORSED]
Replies: 2
Views: 434

Re: Homework chapter 8 #3 part a [ENDORSED]

Hi, In order to solve this problem, you can use the fact that F (force) = P (pressure) x A (area) and that W (work) = F (force) x D (distance). Combining these two equations, we get W = (A x P) x D because we substituted P x A for F. The pressure is given in the problem and the area A can be calcula...
by Swati_Sharma_2D
Sun Jan 15, 2017 2:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019875

Re: Post All Chemistry Jokes Here

What do you do with a sick chemist?
If you can't helium, and you can't curium, then you might as well barium.
by Swati_Sharma_2D
Sat Dec 03, 2016 8:49 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: What is Ka2?
Replies: 1
Views: 324

Re: What is Ka2?

Hi,

Polyprotic acids (acids that have more than one proton to donate) will have Ka2 values. The Ka2 value describes the constant that you should use when the polyprotic acid is losing its second proton (H+).
by Swati_Sharma_2D
Thu Nov 24, 2016 10:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019875

Re: Post All Chemistry Jokes Here

Screen Shot 2016-11-24 at 10.09.05 PM.png
by Swati_Sharma_2D
Fri Nov 04, 2016 9:47 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Energy Level differences depending on Z
Replies: 1
Views: 295

Energy Level differences depending on Z

Can someone explain why the pi 2p energy level has less energy than the sigma 2p orbital when Z <8 and why the pi 2p energy level has more energy when Z>8? I understand that that is the case, but I don't understand why.
by Swati_Sharma_2D
Sat Oct 29, 2016 10:34 pm
Forum: Quantum Numbers and The H-Atom
Topic: Group 11 Metals Quantum Numbers
Replies: 1
Views: 327

Re: Group 11 Metals Quantum Numbers

This is because they are exceptions and do not follow the normal electron configuration rules (their d orbital is completely filled with only one electron in the s orbital). There are only a couple of elements that have exceptions, and Cu, Au, and Ag are three of them. It would not be correct to say...
by Swati_Sharma_2D
Thu Oct 27, 2016 1:43 am
Forum: Lewis Structures
Topic: Noble Gas as central atom
Replies: 1
Views: 357

Re: Noble Gas as central atom

Hi, I believe it depends on the electronegativity of the elements in the compound you are trying to make a lewis structure for; if radon or krypton are the least electronegative, I imagine they could go in the center although I don't believe this is very common as it is not something I have seen bef...
by Swati_Sharma_2D
Fri Oct 21, 2016 12:19 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019875

Re: Post All Chemistry Jokes Here

How often do I make chemistry jokes?
Periodically.
by Swati_Sharma_2D
Thu Oct 13, 2016 11:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Homework Problem 1.57.
Replies: 1
Views: 292

Re: Homework Problem 1.57.

Hi, Since this is a Balmer series, we know that that n1 = 2, so the fifth line must be n2 = 7. You then have the use the Rydberg equation: v = Rydberg's constant x ((1/(2^2) - 1/(7^2)) After solving for this frequency (v), use c = wavelength x frequency. Plug in the frequency you just solved for and...
by Swati_Sharma_2D
Sat Oct 08, 2016 2:05 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: What exactly is Avogrado's Number? [ENDORSED]
Replies: 1
Views: 315

Re: What exactly is Avogrado's Number? [ENDORSED]

Generally, Avogadro's number is used when a problems asks for how many atoms/molecules/formula units of a certain element or substance there are. In that case, you can use stoichiometry to find the number of units because there are 6.022 x 10^23 units per mole. For example, say you were given a prob...
by Swati_Sharma_2D
Sun Oct 02, 2016 9:37 pm
Forum: Student Social/Study Group
Topic: CHEM JOKES
Replies: 29
Views: 3503

Re: CHEM JOKES

A neutron walks into a bar and asks, "How much for a drink?"
The bartender replies, "For you, no charge."
Haha
by Swati_Sharma_2D
Tue Sep 27, 2016 11:53 pm
Forum: SI Units, Unit Conversions
Topic: SI Unit Kg
Replies: 3
Views: 499

Re: SI Unit Kg

In most chemistry problems I've encountered in my high school chemistry courses, most answers were in grams. It might be easier to report answers in grams especially when a problem requires using dimensional analysis using the molar mass from the periodic table which is given in grams/mole.

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