Search found 30 matches
- Sat Mar 18, 2017 12:58 pm
- Forum: *Alkenes
- Topic: Naming Alkenes/Alkynes
- Replies: 2
- Views: 1476
Re: Naming Alkenes/Alkynes
But will we have to know it if they both appear on the same structure?
- Sat Mar 18, 2017 12:37 pm
- Forum: *Alkenes
- Topic: Naming Alkenes/Alkynes
- Replies: 2
- Views: 1476
Naming Alkenes/Alkynes
Are we going to have to know how to name a structure with both a double and triple bond?
- Sun Mar 12, 2017 6:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Winter 2014 Final Q1C
- Replies: 1
- Views: 471
Winter 2014 Final Q1C
The problem asks to solve for the delta Hvap given a mass of 255 g, an initial temperature of 25 C a boiling point of 47 C, heat capacity of 5.4x10^-3 kJ/C/g and a q of 375 kJ. The problem says that have the mass boils away. The solution said that q=m*C*deltaT + (1/2)m*deltaHvap Why do we set up the...
- Sat Mar 11, 2017 7:57 pm
- Forum: *Alcohols
- Topic: Naming compounds with functional groups [ENDORSED]
- Replies: 1
- Views: 740
Naming compounds with functional groups [ENDORSED]
When naming compounds with a functional group, say alcohol for example, do we start numbering at the site of the functional group since it gets highest priority?
- Fri Mar 03, 2017 6:09 pm
- Forum: *Cycloalkanes
- Topic: More than 2 substituents on ring
- Replies: 1
- Views: 472
More than 2 substituents on ring
When there are more than 2 substituents on a ring, should the bigger substituent be placed on the lowest number on the main chain?
- Thu Mar 02, 2017 11:19 pm
- Forum: *Alkanes
- Topic: Naming Example in Organic Textbook
- Replies: 1
- Views: 492
Naming Example in Organic Textbook
On the bottom of page 6 in the organic textbook is the example of the structure of 3-Ethyl-3,5-dimethylheptane. I know that we are supposed to identify the longest chain as the root of the name, in this case heptane. However, how do we know that the second half of the chain (4,5,6,7 C) is not a subs...
- Mon Feb 27, 2017 9:38 pm
- Forum: *Alkanes
- Topic: First 10 Hydrocarbons Chart
- Replies: 1
- Views: 529
First 10 Hydrocarbons Chart
In the course reader it gives a chart with the first 10 hydrocarbons, the name of the corresponding alkane and its formula. It also gives the name of the alkyl group and its corresponding formula. Could someone please clarify as to what an alkyl group is?
Thanks!
Thanks!
- Fri Feb 24, 2017 8:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009534
Re: Post All Chemistry Jokes Here
Two chemists go into a bar. 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 12, 2017 1:21 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Calculating K for reaction using half reactions [ENDORSED]
- Replies: 4
- Views: 981
Re: Calculating K for reaction using half reactions [ENDORSED]
But this would mean that Ecell=0.22-0.80=-0.58V
Why is the negative value accepted in this case?
Why is the negative value accepted in this case?
- Sat Feb 11, 2017 5:32 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Calculating K for reaction using half reactions [ENDORSED]
- Replies: 4
- Views: 981
Calculating K for reaction using half reactions [ENDORSED]
In the textbook example 14.8 on page 586, the question asks to calculate the equilibrium constant at 25 degrees C for AgCl(s)--->Ag+(aq)+Cl-(aq). The two half reactions that are required to use are R: AgCl(s) + e- ---->Ag(s) +Cl-(aq) E=+0.22V L: Ag+(aq) +e- -----Ag(s) E=+0.80V It says that the secon...
- Sat Feb 11, 2017 3:55 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Example 14.3-Gibbs Free Energy [ENDORSED]
- Replies: 1
- Views: 496
Example 14.3-Gibbs Free Energy [ENDORSED]
Zn(s) + Cu(2+)(aq)--->Zn(2+)+Cu(s)
In example 14.3 where we are told to calculate Gibbs Free Energy using -nFE, it says that n=2 mols. Could someone please explain where 2 mols came from?
Thank you!
In example 14.3 where we are told to calculate Gibbs Free Energy using -nFE, it says that n=2 mols. Could someone please explain where 2 mols came from?
Thank you!
- Sun Feb 05, 2017 7:50 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Inert Conductors
- Replies: 1
- Views: 539
Inert Conductors
Could someone please explain why we use Platinum as an inert conductor and how we know when to do so? Also, if Pt is included in the cell diagram, is it also included in the half reactions?
Thanks!
Thanks!
- Fri Jan 27, 2017 7:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Calculating delta H of a reaction
- Replies: 2
- Views: 663
Calculating delta H of a reaction
When calculating the delta H of a reaction from the delta H of formation values, are gases included in the calculation? In question 9.59, the solution shows the calculation but omits the value for O2.
- Fri Jan 27, 2017 7:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009534
Re: Post All Chemistry Jokes Here
Making bad chemistry jokes because all the good ones Argon
- Sun Jan 22, 2017 5:32 pm
- Forum: Phase Changes & Related Calculations
- Topic: Hess Law Problem 8.55
- Replies: 1
- Views: 545
Hess Law Problem 8.55
Q. "Barium metal is produced by the reaction of aluminum metal with barium oxide. From the standard reaction enthalpies, 2Ba(s) + O2(g)--->2BaO(s) dH=-1107 kJ 2Al(s) + O2(g)---->Al2O3(s) dH=-1676 kJ calculate the rxn enthalpy for the production of metallic barium in the rnx 3BaO(s)+2Al(s)--->Al...
- Mon Jan 16, 2017 3:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess' Law Problem #8.61
- Replies: 1
- Views: 407
Hess' Law Problem #8.61
Could someone please explain to me why the first and second equations in #8.61 are reversed? I know that the objective is to get certain compounds to cancel, but I am still slightly confused because I thought you wanted to get the equations to resemble the original?
Thanks!
Thanks!
- Mon Jan 16, 2017 12:20 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity vs Specific Heat Capacity
- Replies: 1
- Views: 427
Heat Capacity vs Specific Heat Capacity
Is the main difference between heat capacity and specific heat capacity the fact that specific heat increases the temperature of 1 g by 1 degree C and that heat capacity is simply the heat supplied divided by the change in temperature?
- Sat Dec 03, 2016 4:05 pm
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 2
- Views: 734
Naming Coordination Compounds
When do we need to use "bis" and "tris" etc in naming coordination compounds and how do they differ from "di" "tri" etc..?
- Tue Nov 29, 2016 10:48 am
- Forum: Bronsted Acids & Bases
- Topic: Identifying Strong/Weak Acids/Bases
- Replies: 1
- Views: 538
Identifying Strong/Weak Acids/Bases
Is there a specific way to identify compounds as strong/weak acids/bases or is it based on general memorization and familiarity?
Thanks!
Thanks!
- Sun Nov 13, 2016 3:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Finding Coordination Number and Oxidation State [ENDORSED]
- Replies: 7
- Views: 6283
Re: Finding Coordination Number and Oxidation State [ENDORSED]
It says the oxidation state for that complex ion is +2. And wouldn't NH3 have a neutral charge?
- Sun Nov 13, 2016 3:03 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Finding Coordination Number and Oxidation State [ENDORSED]
- Replies: 7
- Views: 6283
Finding Coordination Number and Oxidation State [ENDORSED]
I am slightly confused on how to find the coordination number and oxidation state for complex ions. Could someone please explain how to find both of those values for
[Pt(CN)(NH3)3]+ ?
Thank you!
[Pt(CN)(NH3)3]+ ?
Thank you!
- Wed Nov 09, 2016 9:53 pm
- Forum: Ideal Gases
- Topic: Quiz 3 [ENDORSED]
- Replies: 2
- Views: 794
Re: Quiz 3 [ENDORSED]
To a certain extent, I believe. You need to know the "PV=nRT" equation for sure. Otherwise, it is everything up to page 135 in the Course Reader. Anything that he directly covered I think are fair game.
- Fri Nov 04, 2016 11:47 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009534
Re: Post All Chemistry Jokes Here
Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
He just couldn't put it down.
- Sat Oct 29, 2016 8:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape for Sulfur Tetrafluoride
- Replies: 1
- Views: 808
Shape for Sulfur Tetrafluoride
When S has 4 bonds in SF4, is it considered trigonal by pyramidal instead of tetrahedral because S can hold more than 8 electrons. I believe SF4 was considered seesaw; could someone please explain why? Thank you!
- Mon Oct 24, 2016 7:24 pm
- Forum: Resonance Structures
- Topic: Number of Resonance Structures
- Replies: 1
- Views: 458
Number of Resonance Structures
Is there a way to know how many resonance structures are possible for a given compound? On the quiz will we just be asked to draw a specific amount?
Thanks!
Thanks!
- Tue Oct 18, 2016 4:37 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Textbook Question #2.47 [ENDORSED]
- Replies: 1
- Views: 1120
Textbook Question #2.47 [ENDORSED]
Could someone please clarify how to approach question 47? It asks, "For each of the following ground state atoms, predict the type of orbital (1s, 2p,3d,4f,etc) from which an electron will be removed to form the +1 ion. a.) Ge b.) Mn c.) Ba d.) Au. Does this just asking for me to write out the ...
- Fri Oct 14, 2016 4:38 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009534
Re: Post All Chemistry Jokes Here
How many moles are in a guacamole?
Avocado's number.
Avocado's number.
- Sat Oct 08, 2016 5:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009534
Chemistry Jokes
Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now.
A: He's 0K now.
- Tue Sep 27, 2016 6:45 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Balancing Equations
- Replies: 3
- Views: 1001
Balancing Equations
Are there specific rules when balancing equations regarding the state of a compound? Do the rules vary when you have a solid versus an aqueous, gas or liquid compound? Or do the same general rules for balancing equations apply across the board? Thank you!
- Mon Sep 26, 2016 9:45 pm
- Forum: Student Social/Study Group
- Topic: Chem 14A Delta Terrace Study Group!
- Replies: 3
- Views: 943
Re: Chem 14A Delta Terrace Study Group!
I'd be interested too! Want to meet around 4 or so?