Search found 33 matches

by Antonio Melgoza 2K
Sat Mar 12, 2016 9:58 pm
Forum: *Cycloalkanes
Topic: Quiz 3 Q 5C
Replies: 2
Views: 424

Re: Quiz 3 Q 5C

Chem_Mod wrote:can you post the actual question? The quiz is different from day to day.
by Antonio Melgoza 2K
Sat Mar 12, 2016 3:24 pm
Forum: *Cycloalkanes
Topic: Quiz 3 Q 5C
Replies: 2
Views: 424

Quiz 3 Q 5C

Does anyone know what the correct answer was for 5C when it asked to name the cyclopentane?
by Antonio Melgoza 2K
Tue Mar 08, 2016 11:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode Sign
Replies: 1
Views: 285

Anode Sign

Do you always flip the anode sign? If I want to add both reactions instead of subtracting them will i get the same answer?
by Antonio Melgoza 2K
Tue Mar 01, 2016 10:22 pm
Forum: *Alkanes
Topic: Prep Quiz 3, #6 (pg 44)
Replies: 1
Views: 256

Prep Quiz 3, #6 (pg 44)

How do you decide if the methyl or tertbutyl will get the lower number?
by Antonio Melgoza 2K
Tue Mar 01, 2016 9:52 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: How to determine slow step?
Replies: 1
Views: 303

How to determine slow step?

For Ch.4, question 40 it asks which reactions are fast and which are slow. How do you determine which is fast/slow?
by Antonio Melgoza 2K
Tue Feb 23, 2016 11:04 pm
Forum: *Organic Reaction Mechanisms in General
Topic: How to determine slow step?
Replies: 1
Views: 2600

How to determine slow step?

How would you be able to identify the slow step in an electrophilic addition reaction?
by Antonio Melgoza 2K
Wed Feb 17, 2016 5:45 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units of T
Replies: 2
Views: 327

Units of T

Does it matter if time is in min/sec/hr if the question doesn't specifically state what it wants?
by Antonio Melgoza 2K
Tue Feb 09, 2016 12:08 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Textbook Example 14.9 Cathode/Anode
Replies: 1
Views: 305

Textbook Example 14.9 Cathode/Anode

How can you tell which one will be the cathode and which will be the anode? The cell diagram has Zn(s) | Zn2+ on the left side but why can't it be on the right side?
by Antonio Melgoza 2K
Sun Feb 07, 2016 8:08 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Midterm 2012 Q8
Replies: 1
Views: 292

Midterm 2012 Q8

Can someone walk me through the math? I'm not understanding how it got -2.33?
by Antonio Melgoza 2K
Sun Feb 07, 2016 7:55 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Midterm 2012 Q: 7A
Replies: 2
Views: 424

Re: Midterm 2012 Q: 7A

I was dividing 0.689 by 0.34, I get it now. Thanks!
by Antonio Melgoza 2K
Sun Feb 07, 2016 6:43 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Midterm 2012 Q: 7A
Replies: 2
Views: 424

Midterm 2012 Q: 7A

How do you get -0.35? I got -2.02 for my answer
by Antonio Melgoza 2K
Wed Feb 03, 2016 7:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Textbook Example 14.4: Writing a Cell Reaction
Replies: 1
Views: 222

Textbook Example 14.4: Writing a Cell Reaction

It asks to write the cell reaction for: Pt(s) | H2(g) | HCl(aq) | Hg2Cl2(s) | Hg(l).
The answer is Hg2Cl2(s) + H2(g) ----> 2Hg(l) + 2Cl^-(aq) + 2H^+(aq)
Why did the Cl and H split up?
by Antonio Melgoza 2K
Thu Jan 21, 2016 7:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Textbook Example 8.13: Bond Enthalpy
Replies: 1
Views: 244

Textbook Example 8.13: Bond Enthalpy

How do you know which bonds form/break? There are 6 C-H bonds in CH3CHCH2, why don't those break? The equation is attached below.
by Antonio Melgoza 2K
Fri Jan 15, 2016 11:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat released in exothermic reaction?
Replies: 1
Views: 235

Heat released in exothermic reaction?

How do you find out how much heat is released with an exothermic reaction. Is there a specific formula?
by Antonio Melgoza 2K
Fri Dec 04, 2015 6:49 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Fall 2010 Final Exam
Replies: 1
Views: 385

Fall 2010 Final Exam

For question 2A, the final answer is 6. But I don't understand how you get 6 from 1/(n^2) = 2.78 x 10^-2
Can someone explain how you get 6?
by Antonio Melgoza 2K
Fri Dec 04, 2015 6:39 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Equation
Replies: 1
Views: 320

Uncertainty Equation

Which equation are you supposed to use to find the uncertainty in position and the uncertainty in velocity? I think the book has a different equation than some that i've seen online.
by Antonio Melgoza 2K
Thu Nov 26, 2015 7:51 pm
Forum: Bronsted Acids & Bases
Topic: Concentration of ions in a solution?
Replies: 1
Views: 330

Concentration of ions in a solution?

I don't really understand one of the practice questions from 12.4 in the book. I attached a screenshot of the question. I'm not sure what the equation would be. Can anyone help?
by Antonio Melgoza 2K
Mon Nov 23, 2015 5:59 pm
Forum: Bronsted Acids & Bases
Topic: Molecular Form?
Replies: 1
Views: 350

Molecular Form?

For question J.5 in the homework, it says to leave the substance in its molecular form if the substance is a weak acid or base. What does it mean by molecular form and can I see an example?
by Antonio Melgoza 2K
Thu Nov 19, 2015 10:08 am
Forum: Naming
Topic: Cobalt and Cobaltate?
Replies: 2
Views: 601

Cobalt and Cobaltate?

I'm not sure when to use cobalt and cobaltate. Like for [Co(NH3)6]^(3+) Why is it cobaltate instead of just cobalt. And for
[Co(CN)5(H20)]^(2-) why is cobalt used instead of cobaltate? I thought you add the -ate when the complex has a negative charge?
by Antonio Melgoza 2K
Sat Nov 14, 2015 9:01 pm
Forum: Naming
Topic: Naming Coordination Compounds?
Replies: 2
Views: 556

Naming Coordination Compounds?

For [CoBr(NH3)5] SO4, when written out, why is it bromido and not bromide? Also, why is it cobalt(III) and not cobalt(II)? How would I figure this number out?
by Antonio Melgoza 2K
Wed Nov 11, 2015 5:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure Calculation?
Replies: 1
Views: 312

Partial Pressure Calculation?

The answer for the attached HW problem is 5.4 bar, but I dont understand why. Why is the equation (25)(1.18)/(5.43) instead of (25)(5.43)/(1.18)?
by Antonio Melgoza 2K
Sat Nov 07, 2015 4:04 pm
Forum: Naming
Topic: Formula for tetraamminediaquacobalt(III) bromide?
Replies: 1
Views: 659

Formula for tetraamminediaquacobalt(III) bromide?

For the formula for tetraamminediaquacobalt(III)bromide, why is bromide Br3? And why is Br3 at the end?
by Antonio Melgoza 2K
Fri Nov 06, 2015 6:47 pm
Forum: Naming
Topic: Anionic ligand?
Replies: 1
Views: 249

Anionic ligand?

How can you tell if a ligand is anionic?
by Antonio Melgoza 2K
Wed Oct 28, 2015 10:28 pm
Forum: Lewis Structures
Topic: Lewis Structure of POCL3?
Replies: 1
Views: 3271

Lewis Structure of POCL3?

Can the lewis structure of POCL3 have a single bond and 3 pairs of electrons or does it have to be a double bond with 2 pairs of electrons? And if it does need to have a double bond, why?
by Antonio Melgoza 2K
Mon Oct 26, 2015 12:14 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Why is SF4 Polar?
Replies: 1
Views: 2605

Why is SF4 Polar?

Why is SF4 polar? It's a seesaw shape and trigonal bipyramidal and the dipoles point towards F, but shouldn't that mean that it is nonpolar?
by Antonio Melgoza 2K
Sat Oct 24, 2015 12:03 am
Forum: Naming
Topic: Chemical Formula for a compound?
Replies: 1
Views: 245

Chemical Formula for a compound?

On question 3.25 for the homework, it asks: "Give the chemical formula of each compound for (Hydrogen Telluride). I thought the answer was H3Te but the answer in the book has H2Te, why is it H3 and not H2?
by Antonio Melgoza 2K
Mon Oct 19, 2015 2:06 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Maximum oxidation number
Replies: 2
Views: 488

Maximum oxidation number

How do you find the maximum oxidation number of an element?
by Antonio Melgoza 2K
Fri Oct 09, 2015 9:37 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground state electron configuration?
Replies: 1
Views: 1895

Ground state electron configuration?

How do I find the electron configuration of an element?
by Antonio Melgoza 2K
Sat Oct 03, 2015 9:52 pm
Forum: Properties of Light
Topic: Frequency and Speed?
Replies: 2
Views: 467

Frequency and Speed?

As frequency decreases, speed of radiation should also decreases right? Because a lower frequency = longer wavelengths and longer wavelengths means there are less oscillations per second? I'm a little confused if I'm understanding this correctly. Can someone explain?
by Antonio Melgoza 2K
Sat Oct 03, 2015 5:55 pm
Forum: DeBroglie Equation
Topic: Unit conversion for DeBroglie?
Replies: 1
Views: 285

Unit conversion for DeBroglie?

This is from Example 1.6 in the textbook.
"Calculate the wavelength of a particle of mass 1 g traveling at 1 ms"
The book changes 1 gram into 1 x 10^(-3), but I don't understand how they got 1 x 10^(-3). Can someone explain please?


by Antonio Melgoza 2K
Sat Oct 03, 2015 2:19 am
Forum: Properties of Electrons
Topic: How do I know which formula to use to find photons?
Replies: 2
Views: 588

How do I know which formula to use to find photons?

This is question #25 on the HW. Which formula do I use and why?
Sodium vapor lamps, used for public lighting, emit yellow
light of wavelength 589 nm. How much energy is emitted by
(a) an excited sodium atom when it generates a photon

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