Search found 14 matches

by reginacabanban1I
Sat Mar 12, 2016 1:05 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy for Changes in Pressure
Replies: 1
Views: 324

Entropy for Changes in Pressure

Why is it for dS in calculations for changes in temperature and volume the final state is always in the numerator of the natural log function {ie. ln(V2/V1) or ln (T2/T1)}
but for pressure the equation is dS = nRln(P1/P2)?
by reginacabanban1I
Fri Feb 26, 2016 1:24 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: effect of Temperature
Replies: 1
Views: 300

effect of Temperature

Problem 15.65 For the reversible, one step reaction of 2A ⇌ B + C with the forward rate constant for the formation of B being 265 L/mol/min and reverse rate constant 392 L/mol/min. When there is an increase in the temperature of the reaction, why do we expect the rate of the forward reaction to incr...
by reginacabanban1I
Sat Feb 20, 2016 10:01 pm
Forum: *Organic Reaction Mechanisms in General
Topic: illustrating electron movement with arrows
Replies: 1
Views: 307

illustrating electron movement with arrows

The course reader states that the arrows the show e- source and the destination of the e-
Does this mean the base of the arrow always starts from a line representing a bond and ends at an atom?
by reginacabanban1I
Wed Jan 20, 2016 8:44 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Volume and Degeneracy Relationship
Replies: 1
Views: 256

Volume and Degeneracy Relationship

Why are the volume and degeneracy ratios in isothermal expansions interchangeable? (i.e. p34 of the course reader). Does this mean the actual quantified values of V and W are also interchangeable?
by reginacabanban1I
Sat Jan 09, 2016 6:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units When Calculating Enthalpy Using Hess's Law
Replies: 1
Views: 362

Units When Calculating Enthalpy Using Hess's Law

When you're using Hess's Law to find enthalpy, is it imperative the units are kJ/mol? Or can you calculate using just with kJ and then find the enthalpy per mol afterwards?
by reginacabanban1I
Sat Dec 05, 2015 3:36 pm
Forum: Naming
Topic: the difference between bi- and di- prefixes?
Replies: 2
Views: 14896

the difference between bi- and di- prefixes?

How do you know when to use either bi- or di-? Is bi- ever used at all in naming coordination compounds? I realize that ethylenediamine and dihydrate both use di- but i can't find any examples for the use of the prefix bi-
by reginacabanban1I
Sun Nov 29, 2015 7:03 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Example - 2015 Fall Midterm Q3
Replies: 1
Views: 326

Photoelectric Effect Example - 2015 Fall Midterm Q3

Chem.mov [ 386.48 MiB | Viewed 326 times ]

by reginacabanban1I
Wed Nov 25, 2015 8:16 pm
Forum: Photoelectric Effect
Topic: Video: Photoelectric Effect Example
Replies: 3
Views: 615

Re: Video: Photoelectric Effect Example

Fall Midterm 2015. Q3 Video

Chem.mov [ 386.48 MiB | Viewed 613 times ]

by reginacabanban1I
Sun Nov 15, 2015 10:14 pm
Forum: Naming
Topic: Oxidations Numbers of Central Atom
Replies: 1
Views: 364

Oxidations Numbers of Central Atom

How do we determine which oxidation state is being used for elements with multiple oxidation states?
by reginacabanban1I
Fri Nov 06, 2015 8:12 pm
Forum: Lewis Structures
Topic: Sulfur Dioxide Formal Charges
Replies: 3
Views: 1529

Sulfur Dioxide Formal Charges

Why does the accepted SO2 Lewis structure have one oxygen bonded to the sulfur with a double bond and the other oxygen bonded to the central atom with a singe bond? Wouldn't the structure be more stable with both bonds being doubles and therefore the formal charge on each atom being zero?
by reginacabanban1I
Mon Oct 26, 2015 11:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Polar and Non Polar Molecules
Replies: 2
Views: 484

Re: Determining Polar and Non Polar Molecules

In the Course Reader it says "A polar molecule must have POLAR BONDS with DIPOLES that do not cancel"
Does that mean that molecules of identical atoms (i.e. O3) cannot be polar even though they will have a preferential interaction with a cation or anion?
by reginacabanban1I
Sat Oct 24, 2015 8:21 pm
Forum: Hybridization
Topic: Quick Clarification on Notation
Replies: 1
Views: 300

Re: Quick Clarification on Notation

Dr Lavelle mentioned this in lecture on Friday. He said either notation (with d first or last) is acceptable
by reginacabanban1I
Mon Oct 12, 2015 5:14 pm
Forum: Properties of Electrons
Topic: Atomic Spectra
Replies: 1
Views: 343

Atomic Spectra

How do you know the principle quantum number "n" from a given wavelength?
by reginacabanban1I
Fri Oct 09, 2015 10:46 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shells & Orbitals
Replies: 3
Views: 674

Shells & Orbitals

What is the difference between the shells of an atom and orbitals? Can the terms be used interchangeably or do they differ and one exists as a subset of the other?

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