Search found 30 matches

by Hamilton Oh Dis 3L
Sat Mar 12, 2016 6:42 pm
Forum: *Electrophiles
Topic: CO2
Replies: 1
Views: 342

CO2

Why is CO2 an electrophile
by Hamilton Oh Dis 3L
Fri Mar 11, 2016 1:10 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: cis/trans
Replies: 1
Views: 426

cis/trans

Don't Cl and Br both have atomic numbers of 7? How would one determine which has priority regarding cis/trans?
by Hamilton Oh Dis 3L
Mon Feb 29, 2016 2:38 pm
Forum: *Nucleophiles
Topic: AX2E2
Replies: 2
Views: 544

AX2E2

When is AX2E2 linear instead of bent?
by Hamilton Oh Dis 3L
Wed Feb 10, 2016 1:51 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: EQUATIONS pt 2
Replies: 1
Views: 277

EQUATIONS pt 2

there is the eq: deltaS = nRln(V2/V1) and the eq: w = -nRTln(V2/V1) if you multiply the first equation by -T you get -TdeltaS = -nRTln(V2/V1) which is the same as the second eq So w = -TdeltaS When that is substituted into the Gibbs eq. deltaG = deltaH + w which means deltaG = q + w = deltaU How doe...
by Hamilton Oh Dis 3L
Wed Feb 10, 2016 1:19 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: EQUATIONS
Replies: 1
Views: 226

EQUATIONS

there is the eq: deltaS = nRln(V2/V1)
and the eq: w = -nRTln(V2/V1)

if you multiply the first equation by -T you get -TdeltaS = -nRTln(V2/V1)
which is the same as the second eq

Does that mean w = -TdeltaS???? (during reversible isothermal conditions)??
by Hamilton Oh Dis 3L
Sun Feb 07, 2016 3:16 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Molar entropy
Replies: 1
Views: 453

Molar entropy

Why is the increasing standard molar entropy in the following order:

CH3F < CH2F2 < CHF3 < CF4
by Hamilton Oh Dis 3L
Sat Feb 06, 2016 8:15 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Winter 2012 Midterm
Replies: 1
Views: 210

Winter 2012 Midterm

For Q6A in the Winter 2012 Midterm in the back of the course reader, Gibbs energy was determined based on a "balanced" chemical equation that had 9/2 as one of its coefficients. Doesn't the chemical equation have to be completely balanced to solve for Gibbs?
by Hamilton Oh Dis 3L
Fri Feb 05, 2016 5:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: work
Replies: 2
Views: 407

work

If a battery is doing work, why is the amount of work that leaves the system negative?
by Hamilton Oh Dis 3L
Thu Jan 28, 2016 8:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Endothermic or exothermic
Replies: 3
Views: 384

Endothermic or exothermic

Is the breaking of a bond always endothermic? If not, when would it not be?
by Hamilton Oh Dis 3L
Thu Jan 28, 2016 4:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: bond enthalpies
Replies: 1
Views: 264

bond enthalpies

When calculating the enthalpy of a reaction, why is the breakdown of reactants positive and the formation of products negative. Doesn't breaking bonds release energy meaning that deltaH is negative?
by Hamilton Oh Dis 3L
Sun Jan 24, 2016 11:02 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Boltzman eq
Replies: 1
Views: 348

Boltzman eq

what is the logic/explanation behind the boltzmann equation. how is it relevant?
by Hamilton Oh Dis 3L
Sat Jan 09, 2016 2:39 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Reversible vs. Irreversible reaction
Replies: 1
Views: 269

Reversible vs. Irreversible reaction

Why does a reversible reaction always do more work than an irreversible reaction?
by Hamilton Oh Dis 3L
Fri Dec 04, 2015 8:16 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Henderson-Hasselbalch equation
Replies: 4
Views: 1370

Henderson-Hasselbalch equation

Am I correct in saying that the Henderson-Hasselbalch equation only works for weak acids and bases that have very small K values (x<10^-4)?
by Hamilton Oh Dis 3L
Thu Dec 03, 2015 9:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: SigFigs
Replies: 2
Views: 410

SigFigs

Is pH and pOH always given to the hundredths place?
by Hamilton Oh Dis 3L
Thu Dec 03, 2015 9:30 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: SigFigs 12.57
Replies: 1
Views: 350

SigFigs 12.57

In problem 12.57 from the textbook, the number of sigfigs given is 2. However in the solutions manual, different parts of the problem have different sigfigs. -Ka from part a has 1 sigfig while Kb from part 2 has 2 sigfigs pKa from part a has 2 sigfigs while pKb from part 2 has 3 sigfigs Are these ty...
by Hamilton Oh Dis 3L
Thu Dec 03, 2015 2:00 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: strength of acids/bases
Replies: 1
Views: 294

strength of acids/bases

Does a low pKa value or a low pKb value correspond to higher strength of the acid or base?
by Hamilton Oh Dis 3L
Thu Dec 03, 2015 1:51 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: acetic acid vs trichloroacetic acid vs formic acid
Replies: 1
Views: 2844

acetic acid vs trichloroacetic acid vs formic acid

How is the -CH3 group in acetic acid less electron withdrawing that the -CCl3 group in trichloroacetic acid?
what does electron withdrawing mean?

And how is formic acid a stronger acid that trichloroacetic acid?
by Hamilton Oh Dis 3L
Sun Nov 29, 2015 3:33 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Delocalizing charge of acid
Replies: 1
Views: 416

Delocalizing charge of acid

How does a higher electronegativity of the atom bonded to the oxygen mean more stability? (ex: Cl-O-H vs Br-O-H)
What does this have to do with resonance and electron induction?
by Hamilton Oh Dis 3L
Wed Nov 18, 2015 4:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: SigFigs
Replies: 1
Views: 398

SigFigs

A problem on the post assessment is: 21. A mixture of 2.5 moles H2O and 100 g of C are placed in a 50 L container and allowed to come to equilibrium subject to the following reaction: C(s) + H2O (g) ⇌ CO (g) + H2 (g). The equilibrium concentration of hydrogen is found to be [H2] = 0.040 M. Calculate...
by Hamilton Oh Dis 3L
Tue Nov 10, 2015 2:43 pm
Forum: Naming
Topic: [Co(CN)5(OH2)2]2-
Replies: 1
Views: 949

[Co(CN)5(OH2)2]2-

Why is the water named before the cyanide in Aquapentacyanidocobaltate (IV) ion when C comes before O alphabetically?

Separate question:
Why is the charge for Cobalt 3+ in [Co(SO4)(NH3)5]+
And why does the (NH3) go after (SO4) when N is before S alphabetically?
by Hamilton Oh Dis 3L
Thu Nov 05, 2015 2:26 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Heteronuclear bonds
Replies: 1
Views: 360

Heteronuclear bonds

For a MOT diagram for a heteronuclear bond, which atom is placed above the other?
by Hamilton Oh Dis 3L
Wed Nov 04, 2015 3:47 am
Forum: Ionic & Covalent Bonds
Topic: LiH vs HCl
Replies: 2
Views: 367

LiH vs HCl

Which is more ionic and why? Would you be able to solve this without knowing specific electronegativities?
by Hamilton Oh Dis 3L
Wed Oct 28, 2015 3:13 pm
Forum: Lewis Structures
Topic: HSO3-
Replies: 1
Views: 1887

HSO3-

How would one know that that H is bonded to one of the oxygen atoms instead of the central S atom?
by Hamilton Oh Dis 3L
Thu Oct 22, 2015 3:22 pm
Forum: Lewis Structures
Topic: AX3E2 structure
Replies: 1
Views: 1220

AX3E2 structure

Why does AX3E2 form a T-shape? Shouldn't it be trigonal planar with the two lone pairs on opposite sides from each other (180degrees)?
by Hamilton Oh Dis 3L
Tue Oct 20, 2015 1:09 pm
Forum: Octet Exceptions
Topic: BeCl2 LEWIS STRUCTURE
Replies: 1
Views: 1353

BeCl2 LEWIS STRUCTURE

How is Beryllium able to stay stable with only 4 valence electrons?
by Hamilton Oh Dis 3L
Sun Oct 18, 2015 4:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Boron trifluoride --> Tetrafluoroborate
Replies: 2
Views: 985

Re: Boron trifluoride --> Tetrafluoroborate

But isn't SO4 an ionic compound as well even though it has formal charge 0? Or is it a ionic molecule that is covalently bonded?
by Hamilton Oh Dis 3L
Sat Oct 17, 2015 1:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Boron trifluoride --> Tetrafluoroborate
Replies: 2
Views: 985

Boron trifluoride --> Tetrafluoroborate

Why does the BF3 form a bond with a F- anion to become BF4 given that BF4 does not have a formal charge of 0?
by Hamilton Oh Dis 3L
Wed Oct 14, 2015 8:07 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Comparing accuracies of the uncertainty in velocity
Replies: 1
Views: 325

Comparing accuracies of the uncertainty in velocity

Which could be specified more accurately in a nanoparticle, the speed of an electron or the speed of a Li+ ion?
by Hamilton Oh Dis 3L
Tue Oct 06, 2015 2:35 pm
Forum: Quantum Numbers and The H-Atom
Topic: energy of electron in H-Atom
Replies: 2
Views: 410

energy of electron in H-Atom

The solution to question 2.1 in the textbook states that when the electron in a H atom transitions from the 1s-orbital to the 2p-orbital, the energy of the electron increases, as does the value of n. However, doesn't the energy of an electron approach zero as n increases? Does going from a negative ...
by Hamilton Oh Dis 3L
Fri Oct 02, 2015 4:18 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Energy Levels
Replies: 2
Views: 425

Energy Levels

Suppose a photon of a specific wavelength and frequency hits a H atom and caused it to transition from n=1 to n=3. Will the energy level drop straight from n=3 to n=1 and emit a photon, or will it stop mid-way at n=2 and emit a photon from the n=3 to n=2 transition?

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