Search found 24 matches

by Renee Crippen 2I
Sat Feb 27, 2016 4:32 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 4.30
Replies: 3
Views: 445

Re: 4.30

Because additional energy is needed, this reaction will not occur spontaneously.

Hope this helps!

Renee Crippen 2I
by Renee Crippen 2I
Sat Feb 27, 2016 4:10 pm
Forum: *Alkenes
Topic: Differences in Naming Compounds
Replies: 1
Views: 338

Re: Differences in Naming Compounds

Hi Hogan!

Yes, these compounds should be the same thing; both tell you where the double bonds are.

Hope this helps!

Renee Crippen 2I
by Renee Crippen 2I
Sat Feb 27, 2016 3:53 pm
Forum: *Alcohols
Topic: Why 4-chloro-3-butanol?
Replies: 2
Views: 397

Re: Why 4-chloro-3-butanol?

Hi Yoon Lee!

There are 4 carbons in a continuous chain. This is in spite of the alcohol group being on the third carbon, as alcohol groups may be in the middle of a chain as well.

Hope this Helps!

Renee Crippen 2I
by Renee Crippen 2I
Sat Feb 27, 2016 3:46 pm
Forum: *Alkynes
Topic: Parentheses confusion
Replies: 2
Views: 696

Re: Parentheses confusion

Hi Naiomi,

The parentheses are usually used to denote groups of substituents.

When the book tells you to draw out a structure and see if the carbon has four bonds, they are asking you to consider the structure of the molecule when looking for the longest chain.

Hope this helps!

Renee Crippen 2I
by Renee Crippen 2I
Sat Feb 27, 2016 3:37 pm
Forum: *Carboxylic Acids
Topic: Two -COOH compounds on opposite ends
Replies: 2
Views: 561

Two -COOH compounds on opposite ends

Is it possible to have compound with one -COOH group on each end of a linear compound?

If not, theoretically, would this remove the acidic properties of the compound?

Thanks,

Renee Crippen 2I
by Renee Crippen 2I
Sat Feb 27, 2016 3:27 pm
Forum: *Cycloalkenes
Topic: Naming of Fused Aromatic Rings
Replies: 2
Views: 313

Naming of Fused Aromatic Rings

Can fused heterocyclic aromatic rings (e.g. purine) be named with the nomenclature practices we have been learning in class?

I guess another way to phrase this is: is purine a "nickname"? Or do we follow other naming procedures for it?

Thanks,

Renee Crippen 2I
by Renee Crippen 2I
Sat Feb 27, 2016 3:02 pm
Forum: *Cycloalkenes
Topic: Nomenclature
Replies: 3
Views: 416

Re: Nomenclature

Hi Phu Mai!

The problem lies in minimizing the carbon numbers of the substituents.

To put it visually, 1-Ethyl-2,2-dimethylcyclopropane:
1+2+2=5

2-Ethyl-1,1-dimethylcyclopropane:
2+1+1=4

So 2-Ethyl-1,1-dimethylcyclopropane is a better nomenclature.

Renee Crippen 2I
by Renee Crippen 2I
Sun Feb 07, 2016 10:22 pm
Forum: Environment, Fossil Fuels, Alternative Fuels
Topic: Why energy crisis?
Replies: 7
Views: 2489

Re: Why energy crisis?

Related to this, when the energy is converted to useless forms, such a heat/ friction/ chemical energy and eventually into the random motion of particles in the air, where does it go from there? I'll just answer it in regards to heat. I'm sure you know that come of it stays within the earth and its...
by Renee Crippen 2I
Sun Feb 07, 2016 10:12 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Why don't we divide Quiz 1, 2014 #9 by 2?
Replies: 3
Views: 370

Re: Why don't we divide Quiz 1, 2014 #9 by 2?

But by balanced, does it mean for the least whole integer? For example if the balanced reaction for the combustion of molecule "A" is: 2A+4B->C Do we use the stated equation above, or do we use A+2B-> 0.5C Because it is referring to the combustion of molecule A, which implies it should be ...
by Renee Crippen 2I
Sun Feb 07, 2016 10:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Porous Pot- Daniell cell
Replies: 2
Views: 4581

Porous Pot- Daniell cell

What is the purpose of a porous pot in a Daniell cell (described on page 570)? The textbook says it allows for the ions to diffuse as they are made with the flow of electric current, but why not just remove it completely?
by Renee Crippen 2I
Sun Feb 07, 2016 10:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Picture
Replies: 1
Views: 196

Re: Picture

Hi Sydney!

Drawing a galvanic cell with the cathode on the left and the anode on the right would essentially be like picking up a battery and turning it 180 degrees clockwise. The reaction doesn't change!


Hope this helps.

Renee Crippen 2I
by Renee Crippen 2I
Tue Jan 26, 2016 1:10 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Why don't we divide Quiz 1, 2014 #9 by 2?
Replies: 3
Views: 370

Why don't we divide Quiz 1, 2014 #9 by 2?

Hi all, So if you calculate #9 on Quiz 1 2014 using the balanced equation 2HgO -> 2Hg+O2, you get 117.1 KJ/mol (the answer in the book). If you solve the problem in terms of the decomposition of 1 mol HgO, HgO->Hg+0.5O2, you get 58.56 KJ/mol, (half the answer in the book). So if you solve the proble...
by Renee Crippen 2I
Thu Jan 14, 2016 3:38 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Adiabatic clarification
Replies: 1
Views: 274

Adiabatic clarification

If a reaction is adiabatic, q=0. If a reaction is isothermal, the change in temperature is 0. A reaction that is isothermal can have a flow of energy without a change in temperature. Can any adiabatic reactions have a change in temperature?

Thank you

Renee Crippen 2I
by Renee Crippen 2I
Sun Nov 29, 2015 11:59 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Negative pH???
Replies: 2
Views: 427

Re: Negative pH???

You can achieve a negative pH if the molarity of hydrogen ions is greater than 1.
by Renee Crippen 2I
Sun Nov 29, 2015 11:32 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: ACID BASE EXAMPLE Review Videos
Replies: 1
Views: 323

Re: ACID BASE EXAMPLE Review Videos

Hopefully this upload works!
by Renee Crippen 2I
Sun Nov 29, 2015 11:21 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: ACID BASE EXAMPLE Review Videos
Replies: 1
Views: 323

ACID BASE EXAMPLE Review Videos

Hey All! I typed up some notes outlining my approach to a few different types of acid-base problems! I'm having a bit of difficulty uploading the video directly, so for now I'll just list two links: https://www.youtube.com/watch?v=ZjQwXzu8IYo"onclick="window.open(this.href);return false; https://www...
by Renee Crippen 2I
Sun Nov 22, 2015 9:59 pm
Forum: Bronsted Acids & Bases
Topic: J.5 Acid-Base Reactions
Replies: 1
Views: 400

Re: J.5 Acid-Base Reactions

Hi Yurash!

The formed products should be CH3NO3 and NH3.

Hope this Helps!

Renee Crippen 3H
by Renee Crippen 2I
Sun Nov 08, 2015 7:52 pm
Forum: Naming
Topic: Order of Listing
Replies: 2
Views: 366

Re: Order of Listing

Hi Chris!

As far as I am aware, the order of the ligands should not matter. It is important, however, to be careful to list the ligand carefully depending on how it is bonded to the transition metal. For example, be careful when listing CN- and NC-!


Hope this helps!

Renee Crippen 3H
by Renee Crippen 2I
Wed Oct 21, 2015 11:57 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Shape
Replies: 2
Views: 182

Re: Determining Shape

Hi Rachel! Tetrahedral and trigonal pyramidal structures are the same. A terahedral structure is one in the shape of a tetrahedron, or a 4 sided three-dimensional figure. Tetrahedrons are typically composed of four equal, equilateral triangles: one "base" and three "sides." Simil...
by Renee Crippen 2I
Wed Oct 21, 2015 11:39 am
Forum: Properties of Electrons
Topic: Clarifications on Electrons Changing Energy Levels
Replies: 4
Views: 528

Re: Clarifications on Electrons Changing Energy Levels

Speaking of atoms only absorbing specific energies, I was a bit confused about both the Balmer and Lyman series - are they unique to hydrogen or applicable to other elements? Hi Amanda! Yes, the Balmer and Lyman series are only applicable to hydrogen. They are known hydrogen emission spectral serie...
by Renee Crippen 2I
Wed Oct 21, 2015 11:35 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework 4.23 C
Replies: 1
Views: 570

Re: Homework 4.23 C

Hi! As the answer book states, "Note: Other acceptable Lewis structures are possible (those with double bonds between the central atom and oxygen, which are more stable structures due to the lowering of formal charge)..." Technically, both structures are correct, but the one with a double ...
by Renee Crippen 2I
Sun Oct 11, 2015 4:24 pm
Forum: Significant Figures
Topic: Answer Specificity
Replies: 2
Views: 478

Re: Answer Specificity

Hi Hank! This may be something you may want to contact your TA or visit office hours for. I believe that the differences between your answers and the answers in the solutions manual (assuming you are correctly determining the number of significant figures) may arise from a difference in the use of k...
by Renee Crippen 2I
Thu Oct 01, 2015 12:09 pm
Forum: Properties of Electrons
Topic: Clarifications on Electrons Changing Energy Levels
Replies: 4
Views: 528

Clarifications on Electrons Changing Energy Levels

It was stated that if an electron moves up an energy level, such as from n=1 to n=2, it is because energy is absorbed from light. If the electron moves from n=2 back to n=1, the energy is released as light. What happens if a source of light is not enough to move an electron from n=1 to n=2? Does the...

Go to advanced search