Search found 13 matches

by Arshia_Sabir_3E
Tue Mar 14, 2017 10:14 am
Forum: *Cycloalkanes
Topic: What is this structure?
Replies: 2
Views: 434

Re: What is this structure?

it should be 2-ethyl-1-methylcyclopropane
by Arshia_Sabir_3E
Tue Mar 14, 2017 8:40 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788754

Re: Post All Chemistry Jokes Here

Organic chemistry is difficult. Those who study it have alkynes of trouble.
by Arshia_Sabir_3E
Tue Mar 07, 2017 11:12 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Question on Actual Quiz 2
Replies: 2
Views: 259

Re: Quesion on Actual Quiz 2

step 1 was the slow step because k1 was less than k2 which means it takes longer for step one to occur. you can also think of it in terms of activation energy. If k1 is smaller than k2, then the activation energy of k1 is higher (which means it takes longer- higher hill on the reaction profile diagr...
by Arshia_Sabir_3E
Sat Mar 04, 2017 6:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 14449

Re: Quiz 3 Winter 2017

Can someone help me with #6
I don't understand how both of them are nucleophiles?
by Arshia_Sabir_3E
Wed Mar 01, 2017 7:51 am
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 7267

Re: Naming [ENDORSED]

I think they represent which carbon is the group attached to. For instance, In 3-ethyl-2-methylhexane. Hexan shows a 6 carbon chain and since there are two
different alkyl groups attached, we put an ethyl group on the number 3 carbon atom and a methyl group on the number 2 carbon atom.
by Arshia_Sabir_3E
Sun Feb 26, 2017 8:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788754

Re: Post All Chemistry Jokes Here

Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A: A ferrous wheel.
by Arshia_Sabir_3E
Mon Feb 20, 2017 12:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 14098

Re: Quiz 2 Winter 2017

Can someone please help me with #3? I used the integrated rate law for first order and I got t=205 seconds
by Arshia_Sabir_3E
Tue Feb 14, 2017 12:30 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 11
Views: 678

Re: Cell Diagram

The first thing to know is that a double vertical line (||) is used to separate the anode half reaction from the cathode half reaction (represents salt bridge). A single vertical line (|) is used to separate solid, liquid, gas, or aq on the same side. A comma is used to separate same states of matte...
by Arshia_Sabir_3E
Thu Feb 09, 2017 9:34 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ch 14 Exercise 43
Replies: 1
Views: 213

Re: Ch 14 Exercise 43

Use the Nernst equation in order to calculate the PH of the electrolyte at the hydrogen electrode.
You can start with E=E(node)-(0.0256V/n) ln([Sn^2]/[H^+]^2) and Just solve for the concentration of [H^+]^2.
Then convert that concentration to PH by -log([H^+]

Hope this helps!
by Arshia_Sabir_3E
Wed Feb 01, 2017 7:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Potential and Gibbs free energy
Replies: 1
Views: 136

Cell Potential and Gibbs free energy

Can someone please explain conceptually how cell potential and reaction Gibbs free energy are related?
Thanks!
by Arshia_Sabir_3E
Thu Jan 26, 2017 5:15 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Chapter 9 # 19
Replies: 1
Views: 291

Re: Chapter 9 # 19

You can do this problem in 3 reversible steps. First, you have to heat the reactants to 100 celsius, then find the entropy of phase change, which is given in the problem ( 109.0J/Kmol), and then cool the products at 85 celsius. After that you just add the three different entropy together. The first ...
by Arshia_Sabir_3E
Thu Jan 19, 2017 10:36 am
Forum: Phase Changes & Related Calculations
Topic: Textbook Question [ENDORSED]
Replies: 1
Views: 309

Re: Textbook Question [ENDORSED]

The problem 8.65 tells us to calculate the standard enthalpy of formation of dinitrogen pentoxide, so we know that's our product. We have to write out the net equation. Dinitrogen pentoxide ( 2 nitrogen and 5 oxygen) is formed when diatomic molecules N2 and O2 come together. So we know nitrogen gas ...
by Arshia_Sabir_3E
Sat Jan 14, 2017 2:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Measuring Heat Transfer (extensive vs intensive)
Replies: 2
Views: 243

Re: Measuring Heat Transfer (extensive vs intensive)

I know that both Intensive properties and extensive properties are types of physical properties. The main difference is that extensive properties depends on the matter present, for example, heat capacity is an extensive property because the heat required depends on the amount of substance present. T...

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