Search found 19 matches

by Adriana Juarez 1
Sun Feb 28, 2016 6:55 pm
Forum: *Alkenes
Topic: Problem 1.26
Replies: 2
Views: 331

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...
by Adriana Juarez 1
Mon Feb 22, 2016 9:19 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Intro to O Chem pg153
Replies: 1
Views: 351

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...
by Adriana Juarez 1
Sun Feb 21, 2016 4:02 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Course Reader Example Pg 87
Replies: 1
Views: 338

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?
by Adriana Juarez 1
Thu Feb 04, 2016 4:59 pm
Forum: Balancing Redox Reactions
Topic: 14.25
Replies: 1
Views: 253

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...
by Adriana Juarez 1
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: 333

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?
by Adriana Juarez 1
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: 471

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...
by Adriana Juarez 1
Tue Jan 19, 2016 4:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7862
Views: 1100898

Re: Chemistry Jokes

lol
by Adriana Juarez 1
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: 844

Re: How do I know if an acid is weak

Which strong acids and bases should we have memorized?
by Adriana Juarez 1
Fri Nov 27, 2015 9:34 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Electronegativity and acid strength
Replies: 4
Views: 2620

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...
by Adriana Juarez 1
Thu Nov 12, 2015 6:19 pm
Forum: Naming
Topic: H20 or OH2
Replies: 2
Views: 380

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...
by Adriana Juarez 1
Tue Nov 03, 2015 10:24 pm
Forum: Limiting Reactant Calculations
Topic: Fall 2013 MIdterm Q1.
Replies: 1
Views: 336

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.
by Adriana Juarez 1
Tue Nov 03, 2015 10:10 pm
Forum: Limiting Reactant Calculations
Topic: Fall 2013 MIdterm Q1.
Replies: 1
Views: 336

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?
by Adriana Juarez 1
Mon Oct 26, 2015 8:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Practice
Replies: 31
Views: 7595

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 ...
by Adriana Juarez 1
Mon Oct 26, 2015 8:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Practice
Replies: 31
Views: 7595

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.
by Adriana Juarez 1
Mon Oct 26, 2015 3:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Practice
Replies: 31
Views: 7595

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
by Adriana Juarez 1
Sun Oct 25, 2015 9:12 pm
Forum: Bond Lengths & Energies
Topic: Question 3.85 b
Replies: 3
Views: 418

Re: Question 3.85 b

Oooh okay that makes sense. Thank you!
by Adriana Juarez 1
Tue Oct 20, 2015 5:33 pm
Forum: Bond Lengths & Energies
Topic: Question 3.85 b
Replies: 3
Views: 418

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 ...
by Adriana Juarez 1
Sun Oct 18, 2015 10:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 's' orbital properties
Replies: 2
Views: 412

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.
by Adriana Juarez 1
Sun Oct 04, 2015 9:50 pm
Forum: DeBroglie Equation
Topic: De Broglie Equ
Replies: 1
Views: 394

De Broglie Equ

Why can De Broglie's equation only be used for objects that have a rest mass?

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