Search found 14 matches

by Imani Johnson 1H
Sun Mar 19, 2017 1:26 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation
Replies: 3
Views: 692

Re: Chair conformation

Equatorial is more stable than axial conformation so I would say put it at an equatorial position
by Imani Johnson 1H
Sun Mar 19, 2017 1:25 am
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Arrhenius Graphs
Replies: 3
Views: 797

Re: Arrhenius Graphs

Idk if this is what you're asking but, From the 'progress of reaction' energy graph, the activation energy is the difference between the energy of the transition state and the reactants,I believe.
by Imani Johnson 1H
Tue Mar 14, 2017 8:40 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Ethane vs. ethene heat capacity?
Replies: 3
Views: 1059

Re: Ethane vs. ethene heat capacity?

What are the degrees of freedom as it relates to ethane and ethene ? How is this calculated?
by Imani Johnson 1H
Wed Mar 08, 2017 5:25 pm
Forum: *Alkanes
Topic: IuPac Naming
Replies: 1
Views: 356

IuPac Naming

So I was looking over some structural naming and I was a bit confused about when to use -iso...it seems as though you can you it when there are two substituents branching from a single carbon, however some examples say that instead you would write it as dimethyl. So is -iso and -dimethyl interchange...
by Imani Johnson 1H
Wed Mar 08, 2017 10:42 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15865

Re: Quiz 3 Winter 2017

For iuPac naming, when dealing with a cycloalkane, how do you determine which molecule to number as #1, say the cycloalkane has two substituents...for example, a cyclohexane with substiuents of CH3 and Br?
by Imani Johnson 1H
Tue Feb 28, 2017 4:28 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 2
Views: 307

Entropy

Explain this to me conceptually,

how can you determine the sign of entropy when just given a reaction and no numbers? For example, the midterm gives the rxn: CO2(g)+H2O(l)-->H2CO3(aq).

How do you go about this?
by Imani Johnson 1H
Mon Feb 20, 2017 8:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15302

Re: Quiz 2 Winter 2017

Do we have to know how to use the pre-equilibrium approach since that is where we left off or no?

Thanks.
by Imani Johnson 1H
Tue Feb 14, 2017 1:22 pm
Forum: Balancing Redox Reactions
Topic: Redox
Replies: 4
Views: 408

Redox

When balancing redox equations, once you get to the half reactions, if you want the equations to be acid or base, do you use the same method of adding H2O and H+ in order to balance the equations?
by Imani Johnson 1H
Thu Feb 09, 2017 11:20 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Quiz Question:Calculating delta H--amino acid bonds
Replies: 2
Views: 401

Quiz Question:Calculating delta H--amino acid bonds

Okay, so when given amino acid bonds, are we supposed to cancel out bonds on the products and reactants side in order to work with the bond enthalpies given in the chart? Can someone just explain how to solve this problem... >.<
by Imani Johnson 1H
Thu Feb 02, 2017 10:29 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Higher Entropy
Replies: 2
Views: 440

Higher Entropy

If two molecules have the same molecular geometry, what determines which molecule has a higher entropy?
by Imani Johnson 1H
Sun Jan 29, 2017 9:36 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1012910

Re: Post All Chemistry Jokes Here

Image

Wouldn't even wish this on my worst enemy.
by Imani Johnson 1H
Sat Jan 21, 2017 3:17 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1012910

Re: Post All Chemistry Jokes Here

If Fe= Iron....then does,
Female= Iron Man?
by Imani Johnson 1H
Sat Jan 14, 2017 10:17 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpies of Formation
Replies: 1
Views: 290

Standard Enthalpies of Formation

Do we use the formula of the sum of products minus the sum of reactants only for standard enthalpies of formation? Why do we not just add all enthalpies, similar to how we solve problems using Hess's law?

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