Search found 19 matches
- Sun Feb 28, 2016 6:55 pm
- Forum: *Alkenes
- Topic: Problem 1.26
- Replies: 2
- Views: 569
Re: Problem 1.26
The answer in the solutions says this should be named trans-4-bromo-3-methyl-3heptene. Assuming you're using heptane like the solutions has, I don't understand why it would be trans and not cis, since the double bond is on the same side. Question 25 has a similar structure with the double bond locat...
- Mon Feb 22, 2016 9:19 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Intro to O Chem pg153
- Replies: 1
- Views: 593
Intro to O Chem pg153
On this page there is an example with propene+HBr. I understand that the double bond between C=C breaks to supply electrons for Hydrogen, but after that how do you know that only CH obtains a positive charge? If CH2 and CH are both losing two electrons, how do you know that CH is the one with the po...
- Sun Feb 21, 2016 4:02 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Course Reader Example Pg 87
- Replies: 1
- Views: 577
Course Reader Example Pg 87
In the example in the course reader that shows cholesterol+Hbr, how do you know where the binding sites are?
- Thu Feb 04, 2016 4:59 pm
- Forum: Balancing Redox Reactions
- Topic: 14.25
- Replies: 1
- Views: 417
14.25
Number 25 asks you to arrange the metals in order of increasing strength as reducing agents for species in aqueous solutions. I know to determine this you look at the E values, and the more negative they are the higher their reducing ability.... But when you look at Appendix 2B, Cu for example has t...
- Sun Jan 24, 2016 6:52 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Example 9.6 page 329
- Replies: 2
- Views: 601
Re: Example 9.6 page 329
For step 3, it says Cp,m=4R.
It refers us back to section 8.10. This section has a table for Heat Capacities for atoms, linear molecules, and nonlinear molecules.
Can someone explain the difference between these three and how do you know when to use which each expression?
It refers us back to section 8.10. This section has a table for Heat Capacities for atoms, linear molecules, and nonlinear molecules.
Can someone explain the difference between these three and how do you know when to use which each expression?
- Tue Jan 19, 2016 11:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Using bond enthalpies to find reaction enthalpy
- Replies: 1
- Views: 789
Using bond enthalpies to find reaction enthalpy
#73 a. Use bond enthalpies to estimate the reaction enthalpy for: 3C2H2(g)-->C6H6(g) Could someone explain why in this problem the solution is to simply form 6 C-C bonds? Since there is already one C-C bond in C2H2, why does this bond have to be broken and reformed to produce the carbon ring? Also i...
- Tue Jan 19, 2016 4:06 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592907
- Sun Dec 06, 2015 12:23 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: How do I know if an acid is weak
- Replies: 3
- Views: 1223
Re: How do I know if an acid is weak
Which strong acids and bases should we have memorized?
- Fri Nov 27, 2015 9:34 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Electronegativity and acid strength
- Replies: 4
- Views: 14386
Re: Electronegativity and acid strength
Is the above explanation only true for oxoacids?
Because when you compare molecules such as HCl, HF, HBr, and HI, acidity increases as electronegativity (and thus electron affinity) decreases. A strong acid easily loses the H+ ion, so the stronger acids have to have a lower electron affinity...
Because when you compare molecules such as HCl, HF, HBr, and HI, acidity increases as electronegativity (and thus electron affinity) decreases. A strong acid easily loses the H+ ion, so the stronger acids have to have a lower electron affinity...
- Thu Nov 12, 2015 6:19 pm
- Forum: Naming
- Topic: H20 or OH2
- Replies: 2
- Views: 726
H20 or OH2
As I was doing some homework problems I noticed that H2O was written as that (H2O) but also as OH2. For example, question 17.30 d has it written as OH2, but when it asks us to write the formula for a coordination compound in question17.31 c, the solutions manual represented the "aqua" part...
- Tue Nov 03, 2015 10:24 pm
- Forum: Limiting Reactant Calculations
- Topic: Fall 2013 MIdterm Q1.
- Replies: 1
- Views: 519
Re: Fall 2013 MIdterm Q1.
Wait, never mind. I know understand that you need moles of CO to determine the limiting reactant for the Step 2 equation.
- Tue Nov 03, 2015 10:10 pm
- Forum: Limiting Reactant Calculations
- Topic: Fall 2013 MIdterm Q1.
- Replies: 1
- Views: 519
Fall 2013 MIdterm Q1.
This question asks us how much hydrogen is produced, but the answer gives moles of CO produced also. How are we supposed to know to find the moles of CO as well since the problem doesn't ask for it? Am I missing something here?
- Mon Oct 26, 2015 8:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Practice
- Replies: 31
- Views: 14895
Re: VSEPR Practice
Perfect, thanks. I also have another question... Whenever it asks us to write the electron configuration in the quiz workbook the answer looks a bit strange and I'm not sure we went over how to do this in class... (examples include #10 on Quiz 2 Fall 2013, and #6 and #7 on Fall 2014). Do we need to ...
- Mon Oct 26, 2015 8:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Practice
- Replies: 31
- Views: 14895
Re: VSEPR Practice
Will we need to know paramagnetism and diamagnetism for this quiz? It's in our practice quizzes but I'm not sure if we've gone over it yet.
- Mon Oct 26, 2015 3:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Practice
- Replies: 31
- Views: 14895
Re: VSEPR Practice
Hello!
I had a question about the first set of practice questions.
For XeOF4, why is it necessary to give Xe a lone pair and O a double bond? Why not use that lone pair to complete Oxygen's octet and eliminate the need for the double bond?
-Adriana
I had a question about the first set of practice questions.
For XeOF4, why is it necessary to give Xe a lone pair and O a double bond? Why not use that lone pair to complete Oxygen's octet and eliminate the need for the double bond?
-Adriana
- Sun Oct 25, 2015 9:12 pm
- Forum: Bond Lengths & Energies
- Topic: Question 3.85 b
- Replies: 3
- Views: 690
Re: Question 3.85 b
Oooh okay that makes sense. Thank you!
- Tue Oct 20, 2015 5:33 pm
- Forum: Bond Lengths & Energies
- Topic: Question 3.85 b
- Replies: 3
- Views: 690
Question 3.85 b
For this question it asks us to place the following molecules in order of decreasing bond length (S02, S03, and SO3 2-). If the bond order for SO2 is 1.5 and the bond order for SO3 is 1.33 (4/3), then why does the book say that these two molecules have equal bond lengths in the solutions manual? My ...
- Sun Oct 18, 2015 10:17 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 's' orbital properties
- Replies: 2
- Views: 976
Re: 's' orbital properties
The s orbital of a higher energy shell can penetrate into the lower energy shells because the s orbitals always have a lower energy. As the energy increases, the electrons are increasingly less able to penetrate the nucleus.
- Sun Oct 04, 2015 9:50 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Equ
- Replies: 1
- Views: 591
De Broglie Equ
Why can De Broglie's equation only be used for objects that have a rest mass?