Search found 25 matches
- Sun Mar 19, 2017 11:12 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Z and E how to tell the difference
- Replies: 2
- Views: 1533
Re: Z and E how to tell the difference
For those, look at the main chain of the carbons, then where the double bond is in the structure. Look at the two biggest molecules on the bond and identify if they are both going in the same direction (up or down). If they are, it would be a cis structure. If the two biggest molecules on the bond a...
- Sun Mar 12, 2017 11:29 am
- Forum: *Haloalkanes
- Topic: 2.16
- Replies: 4
- Views: 1687
Re: 2.16
I believe the #s would be written separately because they are different halides and this way they would not be confused with each other in the naming (even if they are on the same carbon).
- Sat Mar 04, 2017 11:46 pm
- Forum: *Alkanes
- Topic: Self-Test 1.3A [ENDORSED]
- Replies: 1
- Views: 531
Re: Self-Test 1.3A [ENDORSED]
You would get the longest chain for that is a hexane and then there are two methyl substituents (the ones at the top branching off). I believe that is what is giving it the name 2,3-dimethlyhexane because you are trying to get the biggest counting chain meaning if you count the branch off of the 2nd...
- Sat Feb 25, 2017 6:19 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Collision Theory & Transition State Theory
- Replies: 1
- Views: 498
Re: Collision Theory & Transition State Theory
I believe since the reading was assigned, it is possible that we will get questioned on this but probably not completely in depth. As you mentioned, it will probably only be because its relation to the Arrhenius equation. I am pretty sure material assigned in readings but not completely covered in c...
- Sat Feb 18, 2017 10:35 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2995577
Re: Post All Chemistry Jokes Here
Q: Why do chemistry students do well when working with ammonia?
A: Because it's pretty basic stuff.
A: Because it's pretty basic stuff.
- Sun Feb 12, 2017 12:28 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation Versions [ENDORSED]
- Replies: 1
- Views: 558
Re: Nernst Equation Versions [ENDORSED]
You can use both equations for any situation in which you can use the Nernst equation. They should both get you the same answer. It is just a matter of preference and log is usually used when the numbers given for concentrations is to the 10s (.1 or .001) because it is easier to find the log of such...
- Sun Feb 12, 2017 12:20 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation (ln vs log) [ENDORSED]
- Replies: 1
- Views: 953
Re: Nernst Equation (ln vs log) [ENDORSED]
Both ln and log can be used for the Nernst equation but log is used over ln for simplicity. Using ln instead of log should give you the same answer. In that specific problem, I believe they used log because it is just an alternate form of the same equation but usually log is used in place of ln when...
- Sun Feb 05, 2017 3:46 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2995577
Re: Post All Chemistry Jokes Here
Q: What did the cell need when it was dying and could not breathe?
A: Cellular respiration!
A: Cellular respiration!
- Sat Jan 28, 2017 10:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz Preparation
- Replies: 2
- Views: 870
Quiz Preparation
In the back of the course reader, I noticed that the prep quizzes don't have the answers. Is there an answer key for them so we can check our answers?
- Sun Jan 22, 2017 5:48 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Unit conversions
- Replies: 2
- Views: 662
Re: Unit conversions
Most of the common unit conversions are on the back of the periodic table given to us (the laminated one with the course reader) and for the quizzes so if it is on the back of the laminated periodic table, it is on the periodic table we get during the quizzes. I'm pretty sure we will be told if ther...
- Sat Jan 21, 2017 9:17 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Homework Problem 8.41
- Replies: 2
- Views: 570
Homework Problem 8.41
Can someone explain why in the solutions manual, 50g is added twice when trying to find the heat of the ice cube (once when converted into moles and then again when multiplied to numbers 4.184 J*C^(-1)*g^(-1)?
- Sat Jan 14, 2017 12:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Expansion work done by/on the system - Problem 8.17
- Replies: 1
- Views: 411
Re: Expansion work done by/on the system - Problem 8.17
The phase state of the system does affect whether work is done on/by the system, such as in a) work is done by the system because there is expansion from a solid to a liquid (liquids are more dispersed in a sense and therefore there is expansion). It is also okay to assume that w is positive when wo...
- Sat Dec 03, 2016 11:23 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: molecular orbital electron configuration [ENDORSED]
- Replies: 1
- Views: 537
Re: molecular orbital electron configuration [ENDORSED]
You start from the valence orbital of the electron configuration because you are only counting in the valence electrons when using the MO theory. For instance, for C (carbon) you would start at 2s because it is in period 2 of the periodic table and then increase to 2p from there. Hope this helps!
- Sat Dec 03, 2016 11:14 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Finding the "Highest L value for the e-" [ENDORSED]
- Replies: 1
- Views: 720
Re: Finding the "Highest L value for the e-" [ENDORSED]
It would be worded usually from negative to positive. I don't believe it technically matters which order you put it in, but generally the rule for L is -L to postive L so it would be better to word it from negative to positive values of the L.
- Sat Dec 03, 2016 11:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Derivations [ENDORSED]
- Replies: 2
- Views: 731
Re: Derivations [ENDORSED]
I'm pretty sure that means to derive a formula such as the formula for Henderson Hasselbalch. So we will not have to know how to derive that formula or any formulas such as that.
- Fri Dec 02, 2016 8:00 pm
- Forum: Lewis Acids & Bases
- Topic: Common Acids and Bases
- Replies: 3
- Views: 1027
Re: Common Acids and Bases
The Ka and Kb values are going to be given in the problem when you solve it so we don't need to know them. We won't need to know any of them offhand.
- Fri Dec 02, 2016 7:57 pm
- Forum: *Titrations & Titration Calculations
- Topic: weakbase-strong acid question
- Replies: 3
- Views: 751
Re: weakbase-strong acid question
The stoichiometric point is below the ph of 7 because acids have a pH lower than 7. If you add a weak base and a strong acid, the acid has a stronger affect on the stoichiometric point therefore lowering the pH below 7. Basically, after you mix the strong acid and weak base together, the solution is...
- Fri Dec 02, 2016 2:48 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKb and pKa
- Replies: 3
- Views: 2041
Re: pKb and pKa
The weaker bases have a smaller Kb which makes them have a greater pKb (this is the same for Ka and pKa). That means, the smaller the pKb is, the bigger the Kb is and therefore it would be a stronger base. For instance, methylamine has a Kb of 3.6x10^-4 and the pKb is 3.44 (low) which makes it more ...
- Mon Nov 21, 2016 9:12 pm
- Forum: Bronsted Acids & Bases
- Topic: Question 12.9b
- Replies: 1
- Views: 512
Question 12.9b
For question 12.9b it asks which reactions can be classified as reactions between Bronsted acids and bases and to identify the acid and base for the ones that can. part b has the equation NH4I (s) ----> NH3 (g)+ HI (g) and in the solutions manual it lists NH4+ as the acid and I- as the base. Can som...
- Sun Nov 20, 2016 4:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2995577
Re: Post All Chemistry Jokes Here
Q: What do you call a very small piece of iron?
A: A FEtus!
A: A FEtus!
- Sun Nov 20, 2016 4:14 pm
- Forum: Conjugate Acids & Bases
- Topic: Question 12.23
- Replies: 1
- Views: 465
Question 12.23
Could someone please explain part b) of the question? In the solutions manual it says [OH-]=[H3O+], that is because the temperature of both are the same in the question yes?
- Fri Nov 11, 2016 11:56 pm
- Forum: Student Social/Study Group
- Topic: Naming Complexes
- Replies: 6
- Views: 1553
Naming Complexes
Can someone please explain how to name compounds (with an example) that would include the bis-, tris-, or tetrakis-? I don't really understand when that would apply to a complex. Also for the charges, does the overall charge of a complex have any affect on the oxidation number put in the name of the...
- Tue Nov 01, 2016 4:29 pm
- Forum: Hybridization
- Topic: Fall 2015 Practice Midterm
- Replies: 2
- Views: 696
Re: Fall 2015 Practice Midterm
In the structure, there is 2 Nitrogens and each have 3 bonds connected to it but Nitrogen's valence electrons is 5 not 3 so it would take a lone pair for both Nitrogens to fill their valence electrons (Thats 2 lone pairs). The 2 Oxygens connected only have 2 electrons connected to each and the valen...
- Mon Oct 31, 2016 9:27 pm
- Forum: Einstein Equation
- Topic: Quiz 1, Question 5
- Replies: 1
- Views: 787
Re: Quiz 1, Question 5
You use frequency= speed of light/wavelength for 350 nm and 425 nm and solve for frequency and then multiply each frequency by planck's constant (E=hv) (you get v= 7.058x10^14 for 425 nm and multiply by planck's to get 4.67x10^-19 J and you get v=8.57x10^14 for 350 nm and multiply by planck's to get...
- Mon Oct 31, 2016 9:18 pm
- Forum: Student Social/Study Group
- Topic: MIDTERM REVIEW IN SUNSET VILLAGE
- Replies: 2
- Views: 957
Re: MIDTERM REVIEW IN SUNSET VILLAGE
I live in C1! I'd love to come!