Search found 20 matches

by Milan Hirpara 3K
Sun Mar 19, 2017 1:17 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Bond Strain
Replies: 1
Views: 343

Re: Bond Strain

The structure of the bond causes it to not be an ideal angle. For example, if you are working with a cyclopropane, the angle can not be the ideal 109.5 degrees because the structure of the molecule must form an equilateral triangle, which has angles of 60 degrees.
by Milan Hirpara 3K
Sun Mar 19, 2017 12:45 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation
Replies: 3
Views: 493

Re: Chair conformation

You can put it anywhere on ring as long as it is in the equatorial position.
by Milan Hirpara 3K
Sun Mar 19, 2017 12:40 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Boat Conformation
Replies: 1
Views: 2133

Re: Boat Conformation

I know when writing the chair conformation, you start with an up axial and switch between up and down as you go around, then the equatorial is the opposite, however, the boat conformation does not seem to follow this same pattern, so is there a pattern to the bat conformation, or should we just rem...
by Milan Hirpara 3K
Sat Mar 18, 2017 7:26 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 2010 Q4B How to get the Q
Replies: 1
Views: 213

Re: 2010 Q4B How to get the Q

(A- = HA) because there is a buffer involved. Whenever a buffer is involved you can assume (A- =HA).
by Milan Hirpara 3K
Sat Mar 18, 2017 6:39 am
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Energy Calculations
Replies: 2
Views: 442

Re: Energy Calculations

I am extremely confused with the energy's that correspond to that of the different structures of different compounds, how should we be able to verify which structure has more energy if they are both in the chair position? You can tell which structure is more energetic by checking which structure is...
by Milan Hirpara 3K
Sat Mar 18, 2017 6:32 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 3
Views: 287

Re: Concentration Cells

In a concentration cell, why do you need the product concentration to be lower than the reactants? Is it because that would favor a forward reaction rather than a reverse reaction? Q= (anode)/(cathode) . In a concentration cell, you need the anode concentration to be lower than the concentration of...
by Milan Hirpara 3K
Sat Mar 18, 2017 5:56 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Free Energy of Activation
Replies: 1
Views: 260

Re: Free Energy of Activation

Because transition states always have a higher energy than reactants.
by Milan Hirpara 3K
Sat Mar 18, 2017 5:51 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Winter Final 2014 Question 5A
Replies: 1
Views: 196

Re: Winter Final 2014 Question 5A

You know that the reaction is first order because it's the only graph that is able to produce a straight line. Also, we know that m=-k for 1st order rates, so now to find k, you simply find the slope of the 1st order graph, which you can do by using m=(delta y/delta x).
by Milan Hirpara 3K
Sat Mar 18, 2017 5:40 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Equilibrium Values
Replies: 2
Views: 312

Re: Equilibrium Values

delta S and delta H are not zero at equilibrium, only delta G is zero at equilibrium.
by Milan Hirpara 3K
Thu Mar 16, 2017 7:06 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Quiz 2
Replies: 3
Views: 485

Re: Quiz 2

Just because the step shows the reaction is at equilibrium does not mean that step is the rate limiting step. Rate limiting step is determined by the slow step, so whichever step had the lower k, rate constant, is going to be the rate determining step.
by Milan Hirpara 3K
Wed Mar 15, 2017 9:35 pm
Forum: *Alkenes
Topic: Homework Problem 2.47
Replies: 1
Views: 359

Re: Homework Problem 2.47

Alkenes are considered functional groups, and same goes for alkynes.
by Milan Hirpara 3K
Wed Mar 15, 2017 9:28 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: e/z vs trans/cis
Replies: 1
Views: 343

Re: e/z vs trans/cis

Z and cis mean the same thing, and E and trans mean the same thing. The only difference is we use Z/E when doing IUPAC naming. CIS and TRANS are common names.
by Milan Hirpara 3K
Sun Mar 12, 2017 9:12 pm
Forum: First Order Reactions
Topic: Quiz 2 #3
Replies: 1
Views: 291

Re: Quiz 2 #3

The rate law is just RATE= k[(CH3)3C-Br]. Even though the equation is in equilibrium, you still approach it the same way as you always would.
by Milan Hirpara 3K
Fri Mar 10, 2017 3:47 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 14442

Re: Quiz 3 Winter 2017

What are the units for A in the Arrhenius equation?
by Milan Hirpara 3K
Sun Mar 05, 2017 5:44 pm
Forum: General Science Questions
Topic: Lewis structure
Replies: 2
Views: 440

Re: Lewis structure

Also, an easy way of knowing what element is in the center is by looking at the first element in the compound. Whichever element is in the front is normally the central atom.
Example: CO2
- C would be in the center
by Milan Hirpara 3K
Sun Feb 19, 2017 12:50 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788498

Re: Post All Chemistry Jokes Here

Q: Oxygen and Potassium went on a date. How do you think it went?
A: OK!
by Milan Hirpara 3K
Sun Feb 12, 2017 9:45 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Chapter 8 Problem 8.87
Replies: 1
Views: 251

Chapter 8 Problem 8.87

For this problem, the solution book uses three different specific heat capacities for water, but I thought we could just always use 4.18 J/ C x g?
by Milan Hirpara 3K
Thu Feb 02, 2017 9:21 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Irreversible vs reversible pathway
Replies: 2
Views: 375

Re: Irreversible vs reversible pathway

You will know when to use which because the problem will say give the "irreversible" work value or "reversible" work value. Also, in some instances the problem will only give you enough information to use one of the two formulas to solve for work.
by Milan Hirpara 3K
Sun Jan 29, 2017 2:16 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Derivation
Replies: 1
Views: 246

Re: Derivation

I'm not sure how that derivation works either, but for the quizzes and exams are we going to have to understand the derivations? I thought everything was going to be given to us.
by Milan Hirpara 3K
Sun Jan 15, 2017 3:14 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: A System at Constant Volume
Replies: 3
Views: 389

Re: A System at Constant Volume

All three of these systems have constant volume, but the only system of the three that can experience a change in volume would be the open system.

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