Search found 17 matches

by Shah Jafri 4k
Sat Mar 12, 2016 1:57 am
Forum: *Chem3D
Topic: Ring flip
Replies: 1
Views: 716

Ring flip

Is the ring flip the same as rotating the structure 180 degrees? It seems like that ends up being the correct ring flip.
by Shah Jafri 4k
Wed Mar 09, 2016 5:44 pm
Forum: *Alcohols
Topic: type of alcohol
Replies: 1
Views: 333

type of alcohol

How do you determine what type of alcohol a compound is?

For example, #20 in ch.2 -

2methyl-2butanol?
by Shah Jafri 4k
Fri Mar 04, 2016 4:08 pm
Forum: *Electrophilic Addition
Topic: Curve Arrows
Replies: 1
Views: 336

Re: Curve Arrows

In this case it should be double sided arrows. At first the arrow starts at the pi bond which is an electron pair attaching to the hydrogen. Then the H-Br bond get pulled to the Br making it Br-.
by Shah Jafri 4k
Mon Feb 29, 2016 1:28 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate-Determining Step
Replies: 2
Views: 453

Re: Rate-Determining Step

This is the slowest step. This step's equation can be used to determine the rate equation, by using the coefficients in this step. The rate equation does not always match the overall equation, but it does match the rate-determining step, i.e. the slowest step.
by Shah Jafri 4k
Mon Feb 29, 2016 1:26 am
Forum: *Alkanes
Topic: Same numbering
Replies: 1
Views: 253

Re: Same numbering

If the numbering is the same each way, then assign the lower number to the substances in alphabetical order.
by Shah Jafri 4k
Tue Feb 16, 2016 9:51 pm
Forum: First Order Reactions
Topic: 15.29 a and b
Replies: 1
Views: 299

Re: 15.29 a and b

The textbook does this in order to eliminate the negative sign in the first order equation. If you do it the other way you have to account for the negative sign in the equation.
by Shah Jafri 4k
Mon Feb 08, 2016 12:13 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram order
Replies: 1
Views: 265

cell diagram order

IN cell diagrams, does it matter which order the substances are in within each chamber? Within the anode or cathode side of the diagram would it matter if you switched the order of the substances?
by Shah Jafri 4k
Sun Feb 07, 2016 11:36 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram order
Replies: 1
Views: 256

cell diagram order

IN cell diagrams, does it matter which order the substances are in within each chamber? Within the anode or cathode side of the diagram would it matter if you switched the order of the substances?
by Shah Jafri 4k
Sun Jan 31, 2016 11:50 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal Energy and Pressure
Replies: 1
Views: 334

Re: Internal Energy and Pressure

the change in internal energy is not only determined by the pressure of the gases. The internal energy relies on change in enthalpy, pressure and volume. If the pressure is increased and everything else is constant, then the internal energy will decrease. However if the internal energy change is dec...
by Shah Jafri 4k
Mon Jan 25, 2016 12:30 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Determining Spontaneity
Replies: 7
Views: 533

Re: Determining Spontaneity

spontaneity is a concept that does't just depend on deltaH. It is when delta G is negative. Delta G depends on delta H, temperature, and delta S. Just because a reaction is exothermic, it is not necessarily spontaneous.
by Shah Jafri 4k
Sun Jan 17, 2016 11:01 pm
Forum: Phase Changes & Related Calculations
Topic: Work equation
Replies: 2
Views: 455

Work equation

Hello I am still confused on when you are supposed to disregard the negative sign in the equation: -PV=W. Also why do we use the conversion factor 101.3 kpa to convert L atm to joules. Thank you.
by Shah Jafri 4k
Sun Jan 10, 2016 5:48 pm
Forum: Phase Changes & Related Calculations
Topic: Example in course reader
Replies: 2
Views: 296

Example in course reader

In the example in the course reader describing hess's law: N2 + O2 --> 2NO H=180kj 2NO + O2 --> 2NO2 H=-112kj Why do the change in enthalpies in the steps have different signs? (one is positive the other negative) I am confused because both steps are forming one compound. I thought when two compound...
by Shah Jafri 4k
Sun Nov 29, 2015 6:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Final 2014 Number 5 (.mov)
Replies: 1
Views: 321

Final 2014 Number 5 (.mov)

Video answering and explaining number 5 from Final exam 2014.
by Shah Jafri 4k
Sun Nov 29, 2015 6:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question 5 from Fall 2014 Final Exam (flv)
Replies: 1
Views: 286

Question 5 from Fall 2014 Final Exam (flv)

Video (.flv) explanation and answering Question 5 from Fall 2014 Final Exam.
by Shah Jafri 4k
Sat Oct 24, 2015 10:19 pm
Forum: Resonance Structures
Topic: 3.57 part a
Replies: 1
Views: 342

3.57 part a

I understand that SO3 2- has 4 resonance structures that work. The structure with 3 sets of double has more bonds than the other three with just one double bond. Why can't you just represent the lewis structure solely on the one with three double bonds? From my understanding the structure with the m...
by Shah Jafri 4k
Sun Oct 18, 2015 10:58 pm
Forum: Empirical & Molecular Formulas
Topic: Mass of Empirical & Molecular Formulas
Replies: 1
Views: 315

Re: Mass of Empirical & Molecular Formulas

The empirical formula can never exceed the molecular formula. The molecular formula is typically multiples of the empirical formula. The two can also equal each other.
by Shah Jafri 4k
Sun Oct 11, 2015 10:01 pm
Forum: Empirical & Molecular Formulas
Topic: Atomic Orbitals
Replies: 1
Views: 359

Re: Atomic Orbitals

We are not responsible for knowing the f orbital shapes. Apparently they are far too complicated. So for the d orbital there are 5 different shapes. Three of them look similar, just oriented in different angles. These each have four nodes which take up space in between the axis. Another d orbital sh...

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