Search found 23 matches

by Paul Sedaros 1B
Mon Mar 20, 2017 9:31 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020220

Re: Post All Chemistry Jokes Here

Finals week got us like
by Paul Sedaros 1B
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: 777

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
by Paul Sedaros 1B
Wed Mar 15, 2017 11:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: intensive property
Replies: 1
Views: 290

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...
by Paul Sedaros 1B
Wed Mar 15, 2017 11:15 am
Forum: *Alkenes
Topic: Numbering the Double Bond
Replies: 3
Views: 619

Re: Numbering the Double Bond

I believe the number for the double bond is usually placed at the beginning of the alkene name
by Paul Sedaros 1B
Tue Mar 07, 2017 12:13 pm
Forum: *Alkanes
Topic: #1 quiz 3 preparation
Replies: 2
Views: 334

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...
by Paul Sedaros 1B
Tue Mar 07, 2017 12:00 pm
Forum: *Alkanes
Topic: Alkane name
Replies: 3
Views: 330

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...
by Paul Sedaros 1B
Thu Mar 02, 2017 6:19 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Nucleophile & Electrophile
Replies: 1
Views: 193

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...
by Paul Sedaros 1B
Thu Mar 02, 2017 6:14 pm
Forum: *Electrophiles
Topic: Neither electrophile nor nucleophile
Replies: 2
Views: 2066

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.
by Paul Sedaros 1B
Mon Feb 27, 2017 4:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020220

Re: Post All Chemistry Jokes Here

When someone says love is in the air on Valentine's Day, you know what to say...
by Paul Sedaros 1B
Mon Feb 27, 2017 4:05 pm
Forum: *Nucleophiles
Topic: Nucleophiles and Electronegativity
Replies: 5
Views: 1184

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).
by Paul Sedaros 1B
Sat Feb 25, 2017 5:38 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Electrophiles
Replies: 3
Views: 360

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)
by Paul Sedaros 1B
Tue Feb 21, 2017 9:18 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Units of rate constant k
Replies: 2
Views: 283

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
by Paul Sedaros 1B
Fri Feb 17, 2017 10:59 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: HW Question 15.95
Replies: 1
Views: 164

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...
by Paul Sedaros 1B
Sat Feb 11, 2017 6:47 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible vs. Irreversible [ENDORSED]
Replies: 4
Views: 587

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...
by Paul Sedaros 1B
Sat Feb 11, 2017 3:41 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020220

Re: Post All Chemistry Jokes Here

Q: What is HIJKLMNO?

A: H20
by Paul Sedaros 1B
Mon Feb 06, 2017 7:55 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020220

Re: Post All Chemistry Jokes Here

Q: What do you get when you mix barium, cobalt, and nitrogen?
A: BaCoN
by Paul Sedaros 1B
Sun Feb 05, 2017 10:46 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram Travel
Replies: 1
Views: 221

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.
by Paul Sedaros 1B
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: 221

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.
by Paul Sedaros 1B
Fri Feb 03, 2017 11:18 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020220

Re: Post All Chemistry Jokes Here

NaCl/NaOH: The base is under a salt!
by Paul Sedaros 1B
Fri Jan 27, 2017 8:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020220

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!
by Paul Sedaros 1B
Fri Jan 27, 2017 8:19 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Vant Hoff Equation
Replies: 1
Views: 290

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 ...
by Paul Sedaros 1B
Sun Jan 22, 2017 11:18 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Homework
Replies: 2
Views: 392

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 ...
by Paul Sedaros 1B
Sun Jan 15, 2017 1:55 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Systems Question
Replies: 1
Views: 186

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?

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