## Search found 20 matches

Sun Mar 19, 2017 1:17 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Bond Strain
Replies: 1
Views: 635

### 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.
Sun Mar 19, 2017 12:45 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation
Replies: 3
Views: 874

### Re: Chair conformation

You can put it anywhere on ring as long as it is in the equatorial position.
Sun Mar 19, 2017 12:40 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Boat Conformation
Replies: 1
Views: 2441

### 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...
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: 316

### 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).
Sat Mar 18, 2017 6:39 am
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Energy Calculations
Replies: 2
Views: 738

### 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...
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: 430

### 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...
Sat Mar 18, 2017 5:56 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Free Energy of Activation
Replies: 1
Views: 338

### Re: Free Energy of Activation

Because transition states always have a higher energy than reactants.
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: 325

### 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).
Sat Mar 18, 2017 5:40 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Equilibrium Values
Replies: 2
Views: 427

### Re: Equilibrium Values

delta S and delta H are not zero at equilibrium, only delta G is zero at equilibrium.
Thu Mar 16, 2017 7:06 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Quiz 2
Replies: 3
Views: 937

### 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.
Wed Mar 15, 2017 9:35 pm
Forum: *Alkenes
Topic: Homework Problem 2.47
Replies: 1
Views: 706

### Re: Homework Problem 2.47

Alkenes are considered functional groups, and same goes for alkynes.
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: 682

### 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.
Sun Mar 12, 2017 9:12 pm
Forum: First Order Reactions
Topic: Quiz 2 #3
Replies: 1
Views: 396

### 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.
Fri Mar 10, 2017 3:47 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 19743

### Re: Quiz 3 Winter 2017

What are the units for A in the Arrhenius equation?
Sun Mar 05, 2017 5:44 pm
Forum: General Science Questions
Topic: Lewis structure
Replies: 2
Views: 573

### 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
Sun Feb 19, 2017 12:50 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8039
Views: 1411117

### Re: Post All Chemistry Jokes Here

Q: Oxygen and Potassium went on a date. How do you think it went?
A: OK!
Sun Feb 12, 2017 9:45 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Chapter 8 Problem 8.87
Replies: 1
Views: 308

### 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?
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: 518

### 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.
Sun Jan 29, 2017 2:16 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Derivation
Replies: 1
Views: 309

### 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.
Sun Jan 15, 2017 3:14 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: A System at Constant Volume
Replies: 3
Views: 523

### 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.