Search found 30 matches

by Masahiro Yabe 2H
Sun Mar 13, 2016 2:10 pm
Forum: *Alkanes
Topic: Common names alphabetical order
Replies: 1
Views: 411

Re: Common names alphabetical order

Neo- and Iso- matters.
by Masahiro Yabe 2H
Thu Mar 03, 2016 9:09 pm
Forum: *Cycloalkanes
Topic: Naming cycloalkanes with substutient that contains more C
Replies: 1
Views: 255

Naming cycloalkanes with substutient that contains more C

How do we name cycloalkanes with substituent that contains more carbon atoms than the cycloalkane??
by Masahiro Yabe 2H
Sun Feb 28, 2016 9:26 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Hydrohalogenation
Replies: 1
Views: 417

Hydrohalogenation

Can somebody explain the difference between halogenation and hydrohalogenation??
by Masahiro Yabe 2H
Fri Feb 26, 2016 12:54 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2016
Replies: 48
Views: 18762

Re: Quiz 3 Winter 2016

I was also wondering whether the stuff that we didn't cover in the last chapters are going to be on quiz 3, such as arrhenius equation.
by Masahiro Yabe 2H
Thu Feb 18, 2016 9:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2016
Replies: 18
Views: 6993

Re: Quiz 2 Winter 2016

Just know quiz two doesn't cover arrhenius equation and anything related to the activation energy.
by Masahiro Yabe 2H
Mon Feb 15, 2016 12:37 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Stepwise Reaction
Replies: 1
Views: 675

Stepwise Reaction

Can someone explain to me what stepwise reactions are?
by Masahiro Yabe 2H
Fri Feb 12, 2016 1:02 pm
Forum: Balancing Redox Reactions
Topic: Cell Diagrams
Replies: 4
Views: 498

Re: Cell Diagrams

You put anode on the left and cathode on the right (separated by //).
by Masahiro Yabe 2H
Sun Feb 07, 2016 7:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Answer Book Error 14.35 (b)
Replies: 1
Views: 310

Answer Book Error 14.35 (b)

It seems like there's an error on 14.35 (b) for the n value. The answer book has "In3+ + 2e- ----> In2+." Clearly it only take one electron to balance the charge here.
by Masahiro Yabe 2H
Sun Feb 07, 2016 5:02 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: How do we know when to include H+ on cell diagram?
Replies: 1
Views: 278

How do we know when to include H+ on cell diagram?

How do we know it's necessary to include H+ on cell diagram? For example, 14.17 (b) has cell diagram of
Pt/ Fe3+,Fe2+ // H+,MnO4-, Mn2+ /Pt. And how do we know where to place H+ on the cell diagram?
by Masahiro Yabe 2H
Sun Feb 07, 2016 4:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Determining anode or cathode
Replies: 2
Views: 593

Re: Determining anode or cathode

That's what I thought... and that's what my TA told me during the discussion. But if you look at 14.11 (d), E=0.40V is labeled cathode while E=1.23V is labeled anode. This threw me off by quite a bit... can you explain the reason for this?
by Masahiro Yabe 2H
Sun Feb 07, 2016 4:03 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Determining anode or cathode
Replies: 2
Views: 593

Determining anode or cathode

In text book problem 14.11, how do you determine whether the half reactions are cathodes or anodes?
by Masahiro Yabe 2H
Sat Feb 06, 2016 11:07 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration Cell
Replies: 2
Views: 308

Concentration Cell

Why does E(cell) = 0 in a concentration cell, where two electrodes are identical?
by Masahiro Yabe 2H
Tue Feb 02, 2016 2:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Score
Replies: 2
Views: 626

Quiz 1 Score

Does anyone have a rough idea to when we're getting our quiz 1 back???
by Masahiro Yabe 2H
Sun Jan 24, 2016 7:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law Problem: Possible Error in the Text Book Question
Replies: 1
Views: 220

Hess's Law Problem: Possible Error in the Text Book Question

Practice problem #55 from Ch.8 seems to have a typo in the equation for the formation of Al2O3. Did anyone else encounter the same problem?
by Masahiro Yabe 2H
Sun Jan 17, 2016 11:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Intermolecular Force
Replies: 1
Views: 234

Intermolecular Force

Can someone explain to me what intermolecular force is and how it is significant in thermodynamics?
by Masahiro Yabe 2H
Tue Jan 12, 2016 10:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Internal Energy Question
Replies: 2
Views: 458

Internal Energy Question

Can someone explain how to do this question?: Calculate the change in internal energy when 2.50kJ of energy is transferred as heat to 1.50mol BF3 at 298K and 1atm at constant volume. (Ans.+2.50kJ)
by Masahiro Yabe 2H
Mon Jan 11, 2016 3:25 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Which can be exchanged: matter or energy?
Replies: 4
Views: 630

Re: Which can be exchanged: matter or energy?

In the closed systems, energy can be transferred to the surrounding or surrounding to the system. However, matter cannot be transferred. Think of uninsulated glass jar with closed lid.
by Masahiro Yabe 2H
Wed Dec 02, 2015 9:14 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Determining pH of aqueous KBr
Replies: 2
Views: 3254

Determining pH of aqueous KBr

Why does aqueous KBr has neutral pH?
by Masahiro Yabe 2H
Wed Dec 02, 2015 2:32 pm
Forum: Bronsted Acids & Bases
Topic: HClO2 vs. HBrO2
Replies: 1
Views: 640

HClO2 vs. HBrO2

When determining whether HClO2 or HBrO2 is stronger acid, how does greater electronegativity of Cl contribute to more polar H-O bond? And how does this more polar H-O bond make HClO2 a stronger acid?
by Masahiro Yabe 2H
Mon Nov 30, 2015 4:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Point for Chem Forum
Replies: 1
Views: 599

Participation Point for Chem Forum

Is there a way to check how many points I have accumulated on the Chem Forum?
by Masahiro Yabe 2H
Fri Nov 27, 2015 2:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Acids & Bases Section
Replies: 1
Views: 479

Acids & Bases Section

When are we finishing the Acids & Bases section by?
by Masahiro Yabe 2H
Sun Nov 15, 2015 10:57 pm
Forum: Naming
Topic: lithium tris(oxalato)cobaltate(III)
Replies: 1
Views: 275

lithium tris(oxalato)cobaltate(III)

What is the formula for lithium tris(oxalato)cobaltate(III)?
by Masahiro Yabe 2H
Sun Nov 15, 2015 10:43 pm
Forum: Naming
Topic: Naming [Co (CN)5 (OH2)]^2-
Replies: 1
Views: 280

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

How do you name [Co (CN)5 (OH2)]^2-?
by Masahiro Yabe 2H
Sun Nov 08, 2015 11:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q vs K
Replies: 4
Views: 830

Re: Q vs K

Q represents the relative ratio of product to reactant at any time during the reaction. K is the relative ratio of product over reactant only when the chemical reaction reaches its equilibrium. Both Q and K are derived the same way. K value is useful in calculating the concentration of reactants and...
by Masahiro Yabe 2H
Sun Nov 01, 2015 10:35 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Determining which of these molecules are diamagnetic.
Replies: 3
Views: 6332

Determining which of these molecules are diamagnetic.

Which of the following molecules are diamagnetic: O2^(2-), S2, O2^(1-), and O2^(1+)? And is there a way to determine this without drawing molecular orbital diagram?
by Masahiro Yabe 2H
Sun Oct 25, 2015 10:09 pm
Forum: Lewis Structures
Topic: Lewis structure of chlorine monoxide, ClO
Replies: 2
Views: 2370

Lewis structure of chlorine monoxide, ClO

Write the Lewis structure of chlorine monoxide, ClO. I wrote the Lewis structure with one single bond connecting Cl and O atoms, giving Cl three pairs of electrons (satisfying octet), and giving O atom two pairs of electron and one lone electron. The formal charges on chlorine and oxygen are both 0....
by Masahiro Yabe 2H
Sun Oct 18, 2015 10:33 pm
Forum: Student Social/Study Group
Topic: Quiz Scores
Replies: 1
Views: 568

Quiz Scores

I'm just curious... will quiz scores from quantum section be posted on MyUCLA?
by Masahiro Yabe 2H
Sun Oct 11, 2015 9:21 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Relationship of C and N.
Replies: 1
Views: 489

Electron Affinity Relationship of C and N.

So I know why the electron affinity of N atom is less than that of C atom. My question is does this relationship apply to other group 7 elements and group 6 elements (like Silicon & Phosphorus, Germanium & Arsenic, etc.)?
by Masahiro Yabe 2H
Sun Oct 04, 2015 2:37 am
Forum: DeBroglie Equation
Topic: Do we have to memorize the mass of proton and neutron?
Replies: 1
Views: 394

Do we have to memorize the mass of proton and neutron?

There were several questions from Ch1 HW that involved calculations using the mass of proton and neutron. These values aren't provided on the cover page (with all the equations and constants) given during quiz and exam. Are we supposed to memorize these two values???
by Masahiro Yabe 2H
Fri Oct 02, 2015 10:59 am
Forum: Einstein Equation
Topic: The value of Planck's Constant
Replies: 3
Views: 991

Re: The value of Planck's Constant

Planck's Constant was calculated from experimental data of E=hv. In this equation, the value of energy and frequency is directly proportional to each other. This is the same equation as y=mx where m is the slope. In the same way, the value of Planck's Constant represent the slope of energy vs. frequ...

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