Search found 32 matches

by 804584179
Sat Mar 12, 2016 1:33 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Ch3 in Newman projection
Replies: 1
Views: 307

Re: Ch3 in Newman projection

both, because both sides have a CH3 branching off since there are no substituents, etc. So in a newman projection, you would draw them on opposite ends to draw the most stable conformation
by 804584179
Sat Mar 12, 2016 1:30 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Conformational Energy Diagrams
Replies: 2
Views: 433

Re: Conformational Energy Diagrams

i think we just have to know equatorial, staggered, etc.
by 804584179
Sat Mar 12, 2016 1:30 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Torsional strain
Replies: 4
Views: 640

Re: Torsional strain

not possible to have negative strain, but it is possible to have little to no strain
by 804584179
Sat Mar 12, 2016 1:27 pm
Forum: General Rate Laws
Topic: Intermediates
Replies: 3
Views: 476

Re: Intermediates

simpler terms: a+b-->c
c+d-->d
C is intermediate because it's made in the first reaction and automatically used up in the second
by 804584179
Sat Mar 12, 2016 1:26 pm
Forum: General Rate Laws
Topic: Rate Order
Replies: 2
Views: 362

Re: Rate Order

yes, this would be considered something like a half-order which would be (ex: X^1/2
by 804584179
Sat Mar 12, 2016 1:25 pm
Forum: General Rate Laws
Topic: rate law
Replies: 1
Views: 280

Re: rate law

Yes, coefficient goes as exponent of coefficient
by 804584179
Thu Mar 10, 2016 2:19 am
Forum: *Electrophiles
Topic: Equal sign with a line through it
Replies: 4
Views: 1031

Re: Equal sign with a line through it

it could refer to double dagger (like delta g double dagger which is used to find pseudo equilibrium point
by 804584179
Thu Mar 10, 2016 2:16 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Stability
Replies: 2
Views: 325

Re: Stability

no (due to the steric straining in the boat formation). The boat flagpole interactions has more steric strain making it less stable.
by 804584179
Thu Mar 10, 2016 2:13 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Trans vs Cis stablity
Replies: 3
Views: 437

Re: Trans vs Cis stablity

trans would probably always be more stable because say you have something like a br coming off of carbon 1, then making the isomer trans would allow for the br to be in an equatorial position and have less steric strain
by 804584179
Thu Mar 10, 2016 2:11 am
Forum: *Cyclopentanes
Topic: cyclohexane newman projection
Replies: 2
Views: 772

cyclohexane newman projection

For a cyclopentane newman projection, would you draw 2 newman circles and connect them or just one?
by 804584179
Thu Mar 10, 2016 2:09 am
Forum: Stereochemistry in Organic Compounds (Chirality, Stereoisomers, R/S, d/l, Fischer Projections)
Topic: What is optically active?
Replies: 3
Views: 5642

Re: What is optically active?

Does this coincide at all with eclipsed and staggered forms?
by 804584179
Thu Mar 03, 2016 9:58 pm
Forum: *Cycloalkanes
Topic: Alphabetic Order or Atomic Number?
Replies: 2
Views: 409

Re: Alphabetic Order or Atomic Number?

alphabetical
by 804584179
Fri Feb 05, 2016 5:37 pm
Forum: Phase Changes & Related Calculations
Topic: Heat curve related to Entropy
Replies: 1
Views: 338

Heat curve related to Entropy

For the question on the quiz that said asked about changing the gas back to an ice cube, what equations would you use to determine the total entropy change when the phases change?
by 804584179
Fri Feb 05, 2016 5:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrolysis
Replies: 1
Views: 288

Electrolysis

Can someone explain the difference between a galvanic cell, a concentration cell, and electrolysis
by 804584179
Fri Jan 22, 2016 10:21 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.49 T value
Replies: 1
Views: 228

Re: 8.49 T value

t is found to be the temperature given at that particular state
by 804584179
Fri Jan 22, 2016 10:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Heat Curve
Replies: 1
Views: 258

Heat Curve

to get from a block of ice to water vapor, what equations would you use? (i think there are 5 steps)
by 804584179
Fri Jan 22, 2016 10:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Q's
Replies: 1
Views: 383

Q's

Can someone explain to me the process of qsys=-qsurr
by 804584179
Fri Jan 22, 2016 10:08 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: What is "d"?
Replies: 2
Views: 368

Re: What is "d"?

Well if it represents small changes, that's basically saying that yes, it represents delta T/v
by 804584179
Fri Jan 22, 2016 10:00 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Equations
Replies: 1
Views: 273

Entropy Equations

For contant t and contant p in the entropy equations, how do you know which variant to use when in the problem they don't give you either?
by 804584179
Fri Jan 22, 2016 9:59 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Internal Energy relation to Entropy
Replies: 2
Views: 303

Re: Internal Energy relation to Entropy

deltaU=0, so q=-w for ideal gas isothermal expansion!
by 804584179
Fri Jan 22, 2016 9:57 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work
Replies: 2
Views: 338

Work

for the problem "calculate the work for a system that releases 346 jK of heat in a process for which the decrease in internal energy is 125 kj. is work done on or by the system?" so i calculated it and the answer was w=221 kJ, but how do you know if work was done on or by the system?
by 804584179
Fri Dec 04, 2015 7:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 2
Views: 361

Re: Q and K

There is an easy way to tell which way the reactant will go! ok, so K comes before q in the alphabet. So set up your inequality always k > q or k<q. Then, draw a line connecting to the way of the alligator sign. Then you get an arrow that lets you know which way the reaction is going to go! So, if k...
by 804584179
Fri Dec 04, 2015 7:51 pm
Forum: Calculating the pH of Salt Solutions
Topic: Why is H-H Equation an approximation
Replies: 2
Views: 647

Re: Why is H-H Equation an approximation

strong acid weak base has a buffer zone (buffer resist ph change), as opposed to strong acid strong base titration
by 804584179
Thu Nov 19, 2015 12:10 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibrium, volume, and concentration
Replies: 1
Views: 209

equilibrium, volume, and concentration

HCL + I2 <--> HI + CL2, how will an increase in the pressure by decreasing the volume effect the concentration of CL2?
by 804584179
Thu Nov 19, 2015 12:09 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: how will equilibrium shift
Replies: 3
Views: 407

how will equilibrium shift

4 NH3 + 3O2 <-> 6H20 + 2N2
can someone explain to me what the equilibrium shift will be if the volume is increased?
by 804584179
Fri Nov 13, 2015 10:36 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: When to use bi-, tri- vs. bis-, tris-?
Replies: 3
Views: 2579

Re: When to use bi-, tri- vs. bis-, tris-?

a common example is ethylenediamine! if there are 2 it would be called bis(en) because of the (di) in (diamond), and if there were 3 it would be tris(en)
by 804584179
Fri Nov 13, 2015 10:33 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ethylenediamine polydentate
Replies: 2
Views: 475

Re: Ethylenediamine polydentate

Bidentate ligands have two donor atoms which allow them to bind to a central metal atom or ion at two points. So in this case, en has 2 carbon as the central atoms. I guess you could look at the (di) in (diamond) and determine that there are 2 nitrogen that have to bond to 2 central atoms to determi...
by 804584179
Fri Nov 06, 2015 2:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity of O3
Replies: 3
Views: 3795

Re: Polarity of O3

O3 is polar because there are 18 valence electrons, so the lewis structure would position the central O connected to one single bond and one double bond to connect the other O's. The loan pair on the central O would also mean the molecule was bent, thus making it polar.
by 804584179
Fri Nov 06, 2015 2:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX2E3 Shape
Replies: 7
Views: 1648

Re: AX2E3 Shape

Ax2E3 resides under the pattern for structures with FIVE regions of electron density, so the pattern would go: tragical bypyramidal, seesaw, t-shape, and then linear. Whereas Ax2E2 follows the tetrahedral series, with FOUR regions of electrons density meaning Ax4: tetrahedral, Ax3E2: trig pry, Ax2E2...
by 804584179
Sun Oct 04, 2015 6:52 pm
Forum: Properties of Electrons
Topic: Wavelength of radiation
Replies: 5
Views: 4477

Re: Wavelength of radiation

I still don't understand part c. So after you find the energy required to remove the electron from the metal surface, how would you find the wavelength? I'm assuming you'd use k=1/2mv^2 and then after that which equation?
by 804584179
Thu Oct 01, 2015 7:36 pm
Forum: Significant Figures
Topic: Basic Rules for Sig Figs
Replies: 3
Views: 541

Re: Basic Rules for Sig Figs

I never learned the rules either, can someone explain?

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