Search found 30 matches
- Thu Mar 16, 2017 10:26 am
- Forum: *Alkanes
- Topic: Naming priorities
- Replies: 1
- Views: 1374
Naming priorities
When naming an organic compound, which has priority for the lowest number? Is it function groups, double/triple bonds, and then substituents?
- Thu Mar 16, 2017 10:06 am
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Orientation of the chair conformation
- Replies: 1
- Views: 422
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?
- Thu Mar 16, 2017 10:05 am
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Question 3.15
- Replies: 2
- Views: 666
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 ...
- Wed Mar 15, 2017 10:26 pm
- Forum: Significant Figures
- Topic: Does temperature count for sig figs? [ENDORSED]
- Replies: 4
- Views: 16128
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.
- Sun Mar 12, 2017 9:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 504195
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...
- Thu Mar 02, 2017 12:14 pm
- Forum: *Cycloalkanes
- Topic: Naming cycloalkanes with 2/+ substituents?
- Replies: 1
- Views: 452
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?
- Sun Feb 26, 2017 11:29 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2762596
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.
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.
- Sun Feb 19, 2017 6:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 23673
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.
- Mon Feb 13, 2017 9:14 pm
- Forum: Balancing Redox Reactions
- Topic: 2016 Midterm #8A
- Replies: 3
- Views: 616
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...
- 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: 488
Inert electrodes?
How do you know when to use an inert electrode and what kind to use?
- 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: 455
Internal energy of an isothermal system?
Is delta U = 0 in an isothermal system? If so, why?
- Sat Jan 28, 2017 11:16 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Standard Gibbs Free Energy Calculation Discrepancies?
- Replies: 1
- Views: 406
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?
- Sun Jan 22, 2017 6:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2762596
Re: Post All Chemistry Jokes Here
What kind of bear can dissolve in water? A polar bear!
- Sun Jan 15, 2017 8:13 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: HW Question 8.9
- Replies: 5
- Views: 888
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 ...
- 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: 9139
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?
- Sat Nov 26, 2016 9:41 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2762596
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."
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."
- Sun Nov 20, 2016 9:53 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2762596
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!"
He said, "No thanks! I'm traveling light!"
- Sat Nov 12, 2016 11:13 am
- Forum: Naming
- Topic: Formula for coordination complex?
- Replies: 3
- Views: 719
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!
- Fri Nov 11, 2016 5:51 pm
- Forum: Naming
- Topic: Formula for coordination complex?
- Replies: 3
- Views: 719
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?
For example, when given pentaaminebromocolbalt (III), are [Co(NH3)5Br]2+ and [CoBr(NH3)5]2+ both correct?
- 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: 6530
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?
- Sun Nov 06, 2016 12:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2762596
Re: Post All Chemistry Jokes Here
what do you call a clown who's in jail?
A silicon!
A silicon!
- Mon Oct 24, 2016 2:34 pm
- Forum: Ionic & Covalent Bonds
- Topic: CN-
- Replies: 4
- Views: 752
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- ...
- 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: 1234
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!
- Wed Oct 19, 2016 9:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Problem 2.47
- Replies: 1
- Views: 474
Re: Problem 2.47
Electrons are removed from the outermost orbital, so I just identified the outermost orbital for each element :)
- Wed Oct 19, 2016 9:12 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: chapter 2 Question 2.29
- Replies: 1
- Views: 523
Re: chapter 2 Question 2.29
#29a says n=2, l=1! I think you just read the wrong question or something haha
- Tue Oct 18, 2016 4:39 pm
- Forum: Resonance Structures
- Topic: Resonance vs Resonance Hybrid?
- Replies: 1
- Views: 744
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!
- 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: 677
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...
- Thu Oct 06, 2016 4:43 pm
- Forum: Properties of Light
- Topic: Energies of the Photon Absorbed and Emitted
- Replies: 1
- Views: 407
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...
- Sun Oct 02, 2016 9:41 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Question E.15 [ENDORSED]
- Replies: 2
- Views: 1030
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...
- Mon Sep 26, 2016 10:04 pm
- Forum: Empirical & Molecular Formulas
- Topic: Chem Workbook Self Test Q4 [ENDORSED]
- Replies: 3
- Views: 1063
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...