Search found 21 matches

by Therese Abely 3A
Mon Mar 07, 2016 5:26 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Common naming with Nitrogen
Replies: 1
Views: 682

Common naming with Nitrogen

For chapter 2 number 35, it had a line structure of N with a methyl, ethyl, and propyl coming off of it. I was just wondering why the common name is N-ethyl-N-methyl-N-propyl amine? Why does propane turn into a propyl? Doesn't there have to be a main carbon chain even in common names?

Thanks!
by Therese Abely 3A
Tue Mar 01, 2016 1:48 pm
Forum: *Ethers
Topic: Question 2.30: IUPAC and Common names
Replies: 1
Views: 722

Question 2.30: IUPAC and Common names

For question 2.30, its states "Give the IUPAC and common name for CH3CH2Ch2OCH2CH2CH2CH3. The answer says it is 1-propoxybutane and butyl propyl ether.

I do not understand where either of these names came from. Can someone please explain?

Thanks
by Therese Abely 3A
Wed Feb 24, 2016 4:41 pm
Forum: *Nucleophiles
Topic: Ambient Nucleophile
Replies: 2
Views: 400

Re: Ambient Nucleophile

Okay, so this is why CN- is the answer to the same type of question for number 6? both C and N are nucleophiles and F- and H2O and HS- all only have 1.
by Therese Abely 3A
Mon Feb 15, 2016 3:00 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Winter 2015 Quiz 2 Preparation
Replies: 2
Views: 353

Re: Winter 2015 Quiz 2 Preparation

I am also confused by this question. I understand that it is not C or E because they both talk about order of the reaction and the question has nothing to do with order, and it is not D because you cannot tell from the question if it is a curved Arrhenius plot. However, I do not understand how you k...
by Therese Abely 3A
Wed Feb 10, 2016 10:05 am
Forum: Phase Changes & Related Calculations
Topic: Winter 2015 Midterm Q4/5D
Replies: 1
Views: 277

Re: Winter 2015 Midterm Q4/5D

In the solutions the process was: ΔS1 =nC(liquid water)*ln (T2/T1) ΔS2= nΔS(vap) ΔS3=nC(water vapor)*ln(T1/T2) The summation of these was 118J/K I did ΔS1= ΔH(vap)/ T boiling ΔS2= nΔC*ln (T1/T boiling) In which ΔC is the C(liquid water)- C(water vapor) And my summation was the same answer Is my pro...
by Therese Abely 3A
Sun Feb 07, 2016 3:18 pm
Forum: Calculating Work of Expansion
Topic: Midterm 2012 Q5, Change in Volume
Replies: 3
Views: 381

Midterm 2012 Q5, Change in Volume

I dont understand when you multiple the answer (when you are finding either change in volume or work) by the 2 R values or when you multiple by 101.325J/L atm?

thanks!
by Therese Abely 3A
Sun Feb 07, 2016 3:15 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm 2011 Q4, Partial Pressures
Replies: 1
Views: 260

Midterm 2011 Q4, Partial Pressures

The question says, "Consider PCl3 + Cl2 -> PCl5 and delta G for PCl5 is -305 kJ/mol and delta G for PCl3 is -267.8 kJ/mol. Assume the reaction is at equilibrium, where T=1943K and the partial pressure for each of the reactants is quell to half that of the product. Calculate the partial pressure...
by Therese Abely 3A
Sun Feb 07, 2016 3:11 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Midterm 2011, Q2B delta S
Replies: 1
Views: 219

Midterm 2011, Q2B delta S

the question says, "Container A is filled with 1.0 moles of the atoms of an ideal monatomic gas. container B, also a gas, has 1.0 does of atoms bound together as diatomic molecules that are mot vibrationally active. Container C, also a gas, has 1.0 moles of atoms bounds together as diatomic mol...
by Therese Abely 3A
Wed Jan 20, 2016 4:25 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible vs. Spontaneous
Replies: 1
Views: 251

Reversible vs. Spontaneous

I'm confused. Is there a difference between reversible and spontaneous? Or are they the same thing?
by Therese Abely 3A
Wed Jan 13, 2016 10:00 pm
Forum: Calculating Work of Expansion
Topic: w=-nRTln(v2/v1)
Replies: 2
Views: 1945

w=-nRTln(v2/v1)

I was doing number 11 for chapter 8 and came across a reversible versus an irreversible expansion. For a reversible, the equation is w=-nRTln(v2/v1) and I was just wondering why there is the ln(v2/v1)? Why isn't the equation just w (or PV) = -nRT?

Thanks!
by Therese Abely 3A
Sun Jan 10, 2016 1:50 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.31: a monatomic ideal gas at constant P or V
Replies: 2
Views: 384

Question 8.31: a monatomic ideal gas at constant P or V

For question 8.31, it states "calculate the heat released by 5.025 g of Kr(g) at .400 atm as it cools from 97.6 C to 25.0 C at (a) constant pressure and (b) constant volume. Assume that neon behaves as an ideal gas." Now when I looked up the answer in the answers book, it says for part (a)...
by Therese Abely 3A
Tue Dec 01, 2015 8:46 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: pH of buffer solution approximation
Replies: 2
Views: 512

Re: pH of buffer solution approximation

the only time I would ever recommend approximating something is when you are ignoring a small X on the bottom of a K problem. For this kind of problem, you would only be able to say pH=pKa if [A-] = [AH] because they you would be taking a log of 1 which is 0.
by Therese Abely 3A
Sun Nov 29, 2015 1:13 pm
Forum: Identifying Acidic & Basic Salts
Topic: NH3 acid or base?
Replies: 3
Views: 43951

Re: NH3 acid or base?

So is NH3 always a base or can it ever act as an acid?
by Therese Abely 3A
Mon Nov 16, 2015 7:11 pm
Forum: Naming
Topic: When to use ion and when not too when naming compounds
Replies: 1
Views: 177

When to use ion and when not too when naming compounds

When are you supposed write the word ion at the end of naming a compound and when are you not supposed to? For example, if you have [Cu(NH3)Cl5]^3-, do you write amminepentachlorocuprate (II) ion or just leave off the ion? If it is a positive in the superscript instead of a negative, do you write th...
by Therese Abely 3A
Thu Nov 12, 2015 10:00 am
Forum: Naming
Topic: Finding the charge
Replies: 2
Views: 278

Re: Finding the charge

I checked 17.1 in the book and it is not this problem so I don't really know where the problem is that you are talking about, but I'll try my best to help. In [Co(NH3)3(OH2)3]2 (SO4)3, (SO4)3 would have a total charge of -6. This means in order for that to balance with [Co(NH3)3(OH2)3]2, the Co woul...
by Therese Abely 3A
Mon Nov 02, 2015 8:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cations and Anions Electron Configurations
Replies: 1
Views: 359

Cations and Anions Electron Configurations

So if you have a cation such as Cu+, its electron configuration would be [Ar]3d^10 since the 4s^1 gets removed. Does this mean then that for this example n would equal 3 and not 4? It's in the 4th row but its 4th shell isn't filled at all so I just need some clarification. Thanks!
by Therese Abely 3A
Mon Oct 26, 2015 10:11 am
Forum: Hybridization
Topic: Hybridization in general
Replies: 4
Views: 562

Re: Hybridization in general

Are the atoms that only have a single bond hybridized as well? Or is it only the central atom? For example, in CF4 is the C atom the only thing that is hybridized or are the F atoms hybridized as well?
by Therese Abely 3A
Sun Oct 25, 2015 8:58 pm
Forum: Electronegativity
Topic: HW 3.77(b)
Replies: 2
Views: 415

Re: HW 3.77(b)

The increase of electronegativity across a period is much greater than the decrease of electronegativity down a group. With this in mind, since F is in group 17 and H is in group 1 (even though it still has a high electronegativity) F has the higher electronegativity of the two.
by Therese Abely 3A
Thu Oct 15, 2015 11:40 am
Forum: Octet Exceptions
Topic: Homework Problem 3.123: Radicals
Replies: 1
Views: 315

Homework Problem 3.123: Radicals

In this question, it asks you to draw the Lewis structure for HOCO, which is an intermediate step in the oxidation of methane to carbon dioxide. You also have to determine if it is a radical or not, which it turns out that there is a lone electron on the C of the Lewis structure. I was just wonderin...
by Therese Abely 3A
Mon Oct 12, 2015 2:29 pm
Forum: Properties of Electrons
Topic: Quiz 1 Preparation Fall 2014 Question 10
Replies: 4
Views: 512

Re: Quiz 1 Preparation Fall 2014 Question 10

This question really confused me too. I tried using the formula that we used in class instead of the one in the book (E=-hR/n^2) but I got a different answer than the correct one. However, I thought we were supposed to learn this formula over the one in the book. Does the equation work if you use th...
by Therese Abely 3A
Fri Oct 02, 2015 4:02 pm
Forum: Significant Figures
Topic: Rounding with Sig Figs
Replies: 3
Views: 453

Rounding with Sig Figs

While doing the homework, I have not been rounding until the very end of the problem. However, when I compare my answer to the solutions book, they round in the middle of the equation and end up with a slightly different number than me. For example, if it is a 3 part equation, the book rounds after ...

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