Search found 30 matches

by Abigail_Low_1A
Thu Mar 16, 2017 10:26 am
Forum: *Alkanes
Topic: Naming priorities
Replies: 1
Views: 600

Naming priorities

When naming an organic compound, which has priority for the lowest number? Is it function groups, double/triple bonds, and then substituents?
by Abigail_Low_1A
Thu Mar 16, 2017 10:06 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Orientation of the chair conformation
Replies: 1
Views: 253

Orientation of the chair conformation

Does the orientation of the chair conformation matter? For example in hw questions 3.15 & 3.16, does it matter which orientation the chair conformation is as long as I have the largest atoms/molecules in the equatorial position?
by Abigail_Low_1A
Thu Mar 16, 2017 10:05 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Question 3.15
Replies: 2
Views: 346

Re: Question 3.15 plus 3.16 Question

The book says the "largest" is more stable in the equatorial position, so I would say size. However, I'm confused about 3.16 because it doesn't state whether the conformation is more stable when methyl is equatorial or not. I'm assuming it's more stable when it is equatorial, because CH3 ...
by Abigail_Low_1A
Wed Mar 15, 2017 10:26 pm
Forum: Significant Figures
Topic: Does temperature count for sig figs? [ENDORSED]
Replies: 4
Views: 6740

Does temperature count for sig figs? [ENDORSED]

On quiz problems that say 25C, I've always thought the final answer should have 2 sig figs. I have seen some discrepancies and wanted some clarification.
by Abigail_Low_1A
Sun Mar 12, 2017 9:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 101113

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, Thank you so much for putting your students before yourself, despite some hard times. Throughout Chem 14A and 14B, there have been times where I have really struggled to grasp the material. However, your many resources helped me to strengthen my understanding and allowed me to do well i...
by Abigail_Low_1A
Thu Mar 02, 2017 12:14 pm
Forum: *Cycloalkanes
Topic: Naming cycloalkanes with 2/+ substituents?
Replies: 1
Views: 227

Naming cycloalkanes with 2/+ substituents?

In the textbook it says "when the structure has more than two substituents, the lowest numbering on the first occurrence of a substituent gives the correct IUPAC name." Do you alphabetize the substituents first and then decide on how to number the structure?
by Abigail_Low_1A
Sun Feb 26, 2017 11:29 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017174

Re: Post All Chemistry Jokes Here

Two chemists go into a restaurant.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" -- and he died.
by Abigail_Low_1A
Sun Feb 19, 2017 6:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15313

Re: Quiz 2 Winter 2017

Diana_Anum1G wrote:I know that quiz 2 covers up to page 73 in the course reader, but where does it cover up to in the homework problems? Is it up to 15.55 because 61 starts talking about activation energy?


Yes, I think so. That's where I stopped.
by Abigail_Low_1A
Mon Feb 13, 2017 9:14 pm
Forum: Balancing Redox Reactions
Topic: 2016 Midterm #8A
Replies: 3
Views: 347

Re: 2016 Midterm #8A

You only do E(cathode)-E(anode) if the values given are standard reduction potentials. If the half reactions given are reduction reactions (with electrons on the reactant side), then the E values given with it are reduction potentials. However, the E value given for the anode is for the oxidation re...
by Abigail_Low_1A
Thu Feb 09, 2017 3:28 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Inert electrodes?
Replies: 2
Views: 282

Inert electrodes?

How do you know when to use an inert electrode and what kind to use?
by Abigail_Low_1A
Mon Jan 30, 2017 11:35 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal energy of an isothermal system?
Replies: 1
Views: 263

Internal energy of an isothermal system?

Is delta U = 0 in an isothermal system? If so, why?
by Abigail_Low_1A
Sat Jan 28, 2017 11:16 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Standard Gibbs Free Energy Calculation Discrepancies?
Replies: 1
Views: 223

Standard Gibbs Free Energy Calculation Discrepancies?

How come calculating for standard free energy using standard free energy of formation will not give the same answer as using enthalpy, temperature, and entropy? If a questions on the quiz asks to calculate standard free energy and both methods are possible, will one answer be considered incorrect?
by Abigail_Low_1A
Sun Jan 22, 2017 6:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017174

Re: Post All Chemistry Jokes Here

What kind of bear can dissolve in water? A polar bear!
by Abigail_Low_1A
Sun Jan 15, 2017 8:13 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: HW Question 8.9
Replies: 5
Views: 513

HW Question 8.9

8.9 An ideal gas in a cylinder was placed in a heater and gained 5.50kJ of energy as heat. If the cylinder increased in volume from 345 mL to 1846 mL against an atmospheric pressure of 750 Torr during the process, what is the change in internal energy of the gas in the cylinder? The solution manual ...
by Abigail_Low_1A
Mon Nov 28, 2016 8:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Details and Review Sessions Fall 2016
Replies: 15
Views: 7950

Re: Final Exam Details and Review Sessions Fall 2016

What acids and bases should we know for the final? Is there a specific list either in the course reader or the textbook that we should study?
by Abigail_Low_1A
Sat Nov 26, 2016 9:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017174

Re: Post All Chemistry Jokes Here

A hydrogen atom and a neutron are walking down the street.
The hydrogen says, "Wait, I dropped an electron, help me look for it."
The neutron says "Are you sure?"
The hydrogen replies "I'm positive."
by Abigail_Low_1A
Sun Nov 20, 2016 9:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017174

Re: Post All Chemistry Jokes Here

A photon checks into a hotel, the front desk asks him, "do you need any help with your luggage?"

He said, "No thanks! I'm traveling light!"
by Abigail_Low_1A
Sat Nov 12, 2016 11:13 am
Forum: Naming
Topic: Formula for coordination complex?
Replies: 3
Views: 396

Re: Formula for coordination complex?

Jennifer_Wong_1G wrote:From what I understand, in the coordination complex you name the ligands first (alphabetized), and then you name the metal atom or ion.

I was referring to the chemical formula haha, but thank you!
by Abigail_Low_1A
Fri Nov 11, 2016 5:51 pm
Forum: Naming
Topic: Formula for coordination complex?
Replies: 3
Views: 396

Formula for coordination complex?

Is there a specific order to follow for writing the chemical formula for a coordination complex (except for writing the TM before the ligands)? Do the ligands have to be alphabetized?

For example, when given pentaaminebromocolbalt (III), are [Co(NH3)5Br]2+ and [CoBr(NH3)5]2+ both correct?
by Abigail_Low_1A
Tue Nov 08, 2016 4:23 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Relationship between bond order and bond length?
Replies: 2
Views: 1842

Relationship between bond order and bond length?

Can I assume that the longer the bond length, the higher the bond order because bond order corresponds to the number of bonds?
by Abigail_Low_1A
Sun Nov 06, 2016 12:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017174

Re: Post All Chemistry Jokes Here

what do you call a clown who's in jail?
A silicon!
by Abigail_Low_1A
Mon Oct 24, 2016 2:34 pm
Forum: Ionic & Covalent Bonds
Topic: CN-
Replies: 4
Views: 391

Re: CN-

Are you referring to it's bonding to other atoms? If so, which? If you are referring to the bond between C and N, that bond is covalent since the difference in electronegativity is only 0.5. Furthermore, there is a triple bond between C and N so the bond between them is actually pretty strong. CN- ...
by Abigail_Low_1A
Mon Oct 24, 2016 2:29 pm
Forum: Resonance Structures
Topic: Which Lewis structure makes the dominant contribution to a resonance hyrbid?
Replies: 1
Views: 524

Which Lewis structure makes the dominant contribution to a resonance hyrbid?

Hi! How do you know which Lewis structure would make the most contribution to a resonance hybrid? Is it based on formal charge? Thanks!
by Abigail_Low_1A
Wed Oct 19, 2016 9:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Problem 2.47
Replies: 1
Views: 316

Re: Problem 2.47

Electrons are removed from the outermost orbital, so I just identified the outermost orbital for each element :)
by Abigail_Low_1A
Wed Oct 19, 2016 9:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: chapter 2 Question 2.29
Replies: 1
Views: 296

Re: chapter 2 Question 2.29

#29a says n=2, l=1! I think you just read the wrong question or something haha
by Abigail_Low_1A
Tue Oct 18, 2016 4:39 pm
Forum: Resonance Structures
Topic: Resonance vs Resonance Hybrid?
Replies: 1
Views: 353

Resonance vs Resonance Hybrid?

Hi! I'm a little confused on the difference between resonance and resonance hybrid. Is resonance just the property of having more than one lewis structure and the resonance hybrid is the actual representation of the molecule, which is a blend of all the possible lewis structures? Thanks in advance!
by Abigail_Low_1A
Fri Oct 14, 2016 4:34 pm
Forum: Quantum Numbers and The H-Atom
Topic: Rydberg Equation, Variations, and which n value to put first.
Replies: 1
Views: 353

Re: Rydberg Equation, Variations, and which n value to put first.

For your first equation, I would personally recommend sticking with E=h(frequency) just because it's more simple and less number crunching. But of course, you would have to decide which equation to use depending on the kind of information given in your problem. And I don't think there is a better va...
by Abigail_Low_1A
Thu Oct 06, 2016 4:43 pm
Forum: Properties of Light
Topic: Energies of the Photon Absorbed and Emitted
Replies: 1
Views: 265

Re: Energies of the Photon Absorbed and Emitted

Yes, the energy of the photon emitted is equivalent to the amount of energy absorbed to excite the electron. The change in energy level (ex. n=1 to n=2 or vice versa) is not equal to the amount of energy of the incoming photon or the energy difference between levels. The change in energy level is ju...
by Abigail_Low_1A
Sun Oct 02, 2016 9:41 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question E.15 [ENDORSED]
Replies: 2
Views: 551

Re: Question E.15 [ENDORSED]

1) You're not looking for the molar mass of chlorine (or chloride) in the molecular formula of M(OH)2. You're suppose to find out what the metal M is, and then determine the molar mass of MCl. For example, if you do the work and find out that the metal is sodium, then you would be looking for the mo...
by Abigail_Low_1A
Mon Sep 26, 2016 10:04 pm
Forum: Empirical & Molecular Formulas
Topic: Chem Workbook Self Test Q4 [ENDORSED]
Replies: 3
Views: 658

Chem Workbook Self Test Q4 [ENDORSED]

Hello! I'm working on Q4 on page 10 of the workbook and I don't really understand how to solve the problem. Can someone explain this to me? Question: 339.20g of Cobalt metal piece is reacted with compressed Fluorine gas to produce a compound with a mass of 996.08g. What is the empirical formula of t...

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