Search found 23 matches
- Mon Mar 20, 2017 9:31 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641680
Re: Post All Chemistry Jokes Here
Finals week got us like
- Sun Mar 19, 2017 11:34 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: When to use Cv or Cp? to calculate change in Entropy
- Replies: 3
- Views: 2232
Re: When to use Cv or Cp? to calculate change in Entropy
When we use Cv, it is usually used when there is a change in temperature in the problem
- Wed Mar 15, 2017 11:09 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: intensive property
- Replies: 1
- Views: 543
Re: intensive property
Intensive properties do not depend on the amount of matter that is present. Boiling point, melting point, color, ductility, and malleability are all examples of intensive properties. If we think of color, no matter how many grams of a substance is being placed, let's say, on a table, the substance o...
- Wed Mar 15, 2017 11:15 am
- Forum: *Alkenes
- Topic: Numbering the Double Bond
- Replies: 3
- Views: 1596
Re: Numbering the Double Bond
I believe the number for the double bond is usually placed at the beginning of the alkene name
- Tue Mar 07, 2017 12:13 pm
- Forum: *Alkanes
- Topic: #1 quiz 3 preparation
- Replies: 2
- Views: 745
Re: #1 quiz 3 preparation
Since there is a carbon chain with 10 carbons, we know the base of the chain is a decane. We also see an isopropyl substituent (CH(CH3)2) attached to the 4th carbon in the decane chain. This is how we get 4-isopropyldecane. For the other answer, if we draw out the CH(CH3)2, we can see a methyl and a...
- Tue Mar 07, 2017 12:00 pm
- Forum: *Alkanes
- Topic: Alkane name
- Replies: 3
- Views: 747
Re: Alkane name
Since there are 7 carbons in a chain (the carbon in the parenthesis is a substituent), we know the chain is a heptane. Now, the substituent only contains one carbon, so therefore it is a methyl group. If we go from right to left, we get 5-methyl-heptane, but from left to right, we get 3-methyl-hepta...
- Thu Mar 02, 2017 6:19 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Nucleophile & Electrophile
- Replies: 1
- Views: 460
Re: Nucleophile & Electrophile
CH3Cl is an electrophile because the electronegativity of chlorine is much stronger than that of carbon, so chlorine has a delta negative while carbon has a delta positive. Therefore, the carbon wants to gain electrons, and the chlorine then wants to breaks off from the molecule because its electron...
- Thu Mar 02, 2017 6:14 pm
- Forum: *Electrophiles
- Topic: Neither electrophile nor nucleophile
- Replies: 2
- Views: 5377
Re: Neither electrophile nor nucleophile
I believe there is no such example of something not being a nucleophile nor an electrophile, because all species and elements always involve electrons, therefore, I think there is only electrophiles and nucleophiles and nothing outside of those classifications.
- Mon Feb 27, 2017 4:15 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641680
Re: Post All Chemistry Jokes Here
When someone says love is in the air on Valentine's Day, you know what to say...
- Mon Feb 27, 2017 4:05 pm
- Forum: *Nucleophiles
- Topic: Nucleophiles and Electronegativity
- Replies: 6
- Views: 5553
Re: Nucleophiles and Electronegativity
Nucleophiles are affected by the electronegativity of the element involved. As electronegativity increases, the nucleophilicity of an element decreases, and that is why Br- is a stronger nucleophile than F- (because fluorine's electronegativity is greater than that of bromine).
- Sat Feb 25, 2017 5:38 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Electrophiles
- Replies: 3
- Views: 816
Re: Electrophiles
Halogens such as chlorine and fluorine are electrophile (electron-loving) because they want that one electron that will help them reach a noble gas state (full electron shell)
- Tue Feb 21, 2017 9:18 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Units of rate constant k
- Replies: 2
- Views: 589
Re: Units of rate constant k
For 0th order: k=M (which is mol/L)/s
For the 1st order: k=s^-1 (or 1/s)
And for the 2nd order: k=M (again mol/L)^-1 x s^-1
For the 1st order: k=s^-1 (or 1/s)
And for the 2nd order: k=M (again mol/L)^-1 x s^-1
- Fri Feb 17, 2017 10:59 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: HW Question 15.95
- Replies: 1
- Views: 406
HW Question 15.95
Hi everyone, So question 15.95 is a graph showing a reaction and its potential energy. Can anyone explain why the first step is the rate-determining step in the reaction in part b) of the problem? Part d) (how many intermediates must form in the reaction) is a little tricky as well for me. Thank you...
- Sat Feb 11, 2017 6:47 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible vs. Irreversible [ENDORSED]
- Replies: 4
- Views: 1102
Re: Reversible vs. Irreversible [ENDORSED]
A reversible reaction occurs when reactants form products and the products (with the aid of reactant(s)) is able to revert back to the reactants (both chemical reactions can occur, for example let's say O2+2H2->2H2O is reversible, water can be separated to form oxygen gas and hydrogen gas and vice v...
- Sat Feb 11, 2017 3:41 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641680
Re: Post All Chemistry Jokes Here
Q: What is HIJKLMNO?
A: H20
A: H20
- Mon Feb 06, 2017 7:55 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641680
Re: Post All Chemistry Jokes Here
Q: What do you get when you mix barium, cobalt, and nitrogen?
A: BaCoN
A: BaCoN
- Sun Feb 05, 2017 10:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram Travel
- Replies: 1
- Views: 483
Re: Cell Diagram Travel
Electrons travel through a conductive wire from the anode to the cathode in a very instantaneous process. A salt bridge is used to help the transfer of electrons back from the cathode to the anode.
- Fri Feb 03, 2017 11:24 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Change in Concentration of Galvanic Cells
- Replies: 1
- Views: 449
Re: Change in Concentration of Galvanic Cells
In a sense, I do not believe that it is not irreversible. The galvanic cell would reach equilibrium and if a perturbation were to occur in the system, there would be the transfer of electrons again until reaching equilibrium.
- Fri Feb 03, 2017 11:18 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641680
Re: Post All Chemistry Jokes Here
NaCl/NaOH: The base is under a salt!
- Fri Jan 27, 2017 8:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641680
Re: Post All Chemistry Jokes Here
I asked the person that was sitting next to me if I could borrow some of their Sodium Hypobromite....he said NaBrO!
- Fri Jan 27, 2017 8:19 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Vant Hoff Equation
- Replies: 1
- Views: 581
Re: Vant Hoff Equation
I think that assuming delta S is constant is what we do unless otherwise stated in a problem. The reason that I would think that we do assume delta S is constant in the Van't Hoff Equation is because it helps to eliminate the delta S/R terms in both ln K1 and ln K2 when we have ln K2/K1, making the ...
- Sun Jan 22, 2017 11:18 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Homework
- Replies: 2
- Views: 844
Re: Homework
An open system is one where both matter and energy can be exchanged (such as a cup of tea or hot chocolate, water (matter) can be added and heat from the mug can be exchanged with the universe). A closed system is one where only energy can be exchanged (such as a the mug of tea/hot chocolate in our ...
- Sun Jan 15, 2017 1:55 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Systems Question
- Replies: 1
- Views: 402
Systems Question
We learned on Friday about the different systems (open, closed, isolated). Are all the isolated systems insulated such as the bomb calorimeter and the constant pressure calorimeter?