Search found 16 matches

by Raymond Le 2G
Wed Mar 09, 2016 4:07 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis/Trans for Conformations
Replies: 1
Views: 329

Cis/Trans for Conformations

How can you tell a conformation is cis or trans? Is it based on whether the atoms attached to the C on a double bond that have the highest priority are both axial/equatorial?
by Raymond Le 2G
Thu Mar 03, 2016 8:14 pm
Forum: *Electrophilic Addition
Topic: Diatomic molecules as electrophiles
Replies: 1
Views: 340

Diatomic molecules as electrophiles

Why are diatomic molecules such as Br2 considered electrophiles when they have full valence electrons?
by Raymond Le 2G
Tue Feb 23, 2016 8:20 pm
Forum: *Electrophilic Addition
Topic: Section 4.3 4.28
Replies: 1
Views: 306

Section 4.3 4.28

"Write the full reaction mechanism for the electrophilic addition reaction of hydrogen bromide, HBr, to propene, CH3CHCH2, producing 2-bromopropane, CH3CHBRCH3. Draw the transition states."

Why is it that the H in HBR bonds specifically to the C bonded to two H?
by Raymond Le 2G
Thu Feb 18, 2016 11:15 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: K and Activation Energy
Replies: 1
Views: 250

K and Activation Energy

What is the relation of the value of K to the magnitude of the Activation Energy of a reaction?
by Raymond Le 2G
Thu Feb 11, 2016 11:53 pm
Forum: General Rate Laws
Topic: Half-Lifes
Replies: 2
Views: 374

Half-Lifes

Can the speed of a reaction generally be inferred based on the half-life, or are there many exceptions to this?
by Raymond Le 2G
Wed Feb 03, 2016 12:26 am
Forum: Balancing Redox Reactions
Topic: Question 14.11 (d)
Replies: 3
Views: 635

Question 14.11 (d)

"Write the half-reactions and the balanced equation for the cell reaction for each of the following galvanic cells:
(d) Pt(s)|O2(g)|H+(aq)||OH-(aq)|O2(g)|Pt(s)"

How can you tell that O2 reacts with H+ in its respective half-reaction?
by Raymond Le 2G
Mon Jan 25, 2016 5:52 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Quiz 1 Preparation Winter 2015 #3
Replies: 1
Views: 314

Quiz 1 Preparation Winter 2015 #3

"If 2.00 mol of an ideal gas at 300. K and 3.00 atm expands isothermally and reversibly from 6.00 L to 18.00 L and has a final pressure of 1.20 atm, what is w, q, and delta U?"

How would one solve this problem?
by Raymond Le 2G
Thu Jan 21, 2016 11:24 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Change in Entropy and Spontaneity
Replies: 1
Views: 315

Change in Entropy and Spontaneity

Does a higher change in entropy value in a reaction necessarily mean that the reaction is more spontaneous?
by Raymond Le 2G
Mon Jan 11, 2016 9:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating Reaction Enthalpy Using Bond Enthalpies
Replies: 1
Views: 805

Calculating Reaction Enthalpy Using Bond Enthalpies

Why is it that when calculating the enthalpy of formation is it "(Sum of Bond Enthalpies of Reactants)" - "(Sum of Bond Enthalpies of Products)" as opposed to the other way around, like it is when calculating the reaction enthalpy when using enthalpy of formation?
by Raymond Le 2G
Thu Jan 07, 2016 11:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.57
Replies: 1
Views: 203

Problem 8.57

I am confused as to how the answer is -312 kJ/mol instead of +312 kJ/mol. Does this have to do with the given values being delta Hc instead of delta Hf?
by Raymond Le 2G
Sat Nov 14, 2015 4:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: #10 from Quiz 3 Prep Fall 2014
Replies: 1
Views: 368

#10 from Quiz 3 Prep Fall 2014

"For the following reaction, if initially 0.100 mol of H2O (g) is placed in a 4.0 L vessel, what is the equilibrium partial pressures of each reactant and of each product?" H2O (g) + C(s) <-> H2 (g) + CO (g) Kp = 3.72 at 1000 K I'm confused as how the answer came to be PH2O = 0.58 atm PH2 ...
by Raymond Le 2G
Sat Oct 31, 2015 8:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pair electrons and dipole moment
Replies: 1
Views: 311

Lone pair electrons and dipole moment

Do lone pairs of electrons have their own dipole moment?
by Raymond Le 2G
Sat Oct 17, 2015 8:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Planes
Replies: 1
Views: 291

Planes

How can you tell which plane a bond is in?
by Raymond Le 2G
Sat Oct 10, 2015 4:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Chromium, Copper, etc.
Replies: 2
Views: 379

Chromium, Copper, etc.

Why is it for these elements and others such as silver that their ground state electron configuration is d10s1 or d5s1?
by Raymond Le 2G
Fri Oct 02, 2015 10:14 pm
Forum: Properties of Light
Topic: Frequency and Intensity
Replies: 2
Views: 401

Frequency and Intensity

Why do waves with higher frequencies have higher intensities? Is frequency proportional to amplitude?

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