Search found 30 matches

by Julia_Gordon_2A
Sat Mar 18, 2017 12:58 pm
Forum: *Alkenes
Topic: Naming Alkenes/Alkynes
Replies: 2
Views: 600

Re: Naming Alkenes/Alkynes

But will we have to know it if they both appear on the same structure?
by Julia_Gordon_2A
Sat Mar 18, 2017 12:37 pm
Forum: *Alkenes
Topic: Naming Alkenes/Alkynes
Replies: 2
Views: 600

Naming Alkenes/Alkynes

Are we going to have to know how to name a structure with both a double and triple bond?
by Julia_Gordon_2A
Sun Mar 12, 2017 6:56 pm
Forum: Phase Changes & Related Calculations
Topic: Winter 2014 Final Q1C
Replies: 1
Views: 238

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...
by Julia_Gordon_2A
Sat Mar 11, 2017 7:57 pm
Forum: *Alcohols
Topic: Naming compounds with functional groups [ENDORSED]
Replies: 1
Views: 348

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?
by Julia_Gordon_2A
Fri Mar 03, 2017 6:09 pm
Forum: *Cycloalkanes
Topic: More than 2 substituents on ring
Replies: 1
Views: 232

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?
by Julia_Gordon_2A
Thu Mar 02, 2017 11:19 pm
Forum: *Alkanes
Topic: Naming Example in Organic Textbook
Replies: 1
Views: 207

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...
by Julia_Gordon_2A
Mon Feb 27, 2017 9:38 pm
Forum: *Alkanes
Topic: First 10 Hydrocarbons Chart
Replies: 1
Views: 244

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!
by Julia_Gordon_2A
Fri Feb 24, 2017 8:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019357

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.
by Julia_Gordon_2A
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: 449

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...
by Julia_Gordon_2A
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: 229

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!
by Julia_Gordon_2A
Sun Feb 05, 2017 7:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Conductors
Replies: 1
Views: 257

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!
by Julia_Gordon_2A
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: 359

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.
by Julia_Gordon_2A
Fri Jan 27, 2017 7:21 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019357

Re: Post All Chemistry Jokes Here

Making bad chemistry jokes because all the good ones Argon
by Julia_Gordon_2A
Sun Jan 22, 2017 5:32 pm
Forum: Phase Changes & Related Calculations
Topic: Hess Law Problem 8.55
Replies: 1
Views: 312

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...
by Julia_Gordon_2A
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: 209

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!
by Julia_Gordon_2A
Mon Jan 16, 2017 12:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity vs Specific Heat Capacity
Replies: 1
Views: 214

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?
by Julia_Gordon_2A
Sat Dec 03, 2016 4:05 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 2
Views: 355

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..?
by Julia_Gordon_2A
Tue Nov 29, 2016 10:48 am
Forum: Bronsted Acids & Bases
Topic: Identifying Strong/Weak Acids/Bases
Replies: 1
Views: 304

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!
by Julia_Gordon_2A
Sun Nov 13, 2016 3:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Finding Coordination Number and Oxidation State [ENDORSED]
Replies: 7
Views: 1214

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?
by Julia_Gordon_2A
Sun Nov 13, 2016 3:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Finding Coordination Number and Oxidation State [ENDORSED]
Replies: 7
Views: 1214

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!
by Julia_Gordon_2A
Wed Nov 09, 2016 9:53 pm
Forum: Ideal Gases
Topic: Quiz 3 [ENDORSED]
Replies: 2
Views: 432

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.
by Julia_Gordon_2A
Fri Nov 04, 2016 11:47 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019357

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.
by Julia_Gordon_2A
Sat Oct 29, 2016 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape for Sulfur Tetrafluoride
Replies: 1
Views: 358

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!
by Julia_Gordon_2A
Mon Oct 24, 2016 7:24 pm
Forum: Resonance Structures
Topic: Number of Resonance Structures
Replies: 1
Views: 266

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!
by Julia_Gordon_2A
Tue Oct 18, 2016 4:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook Question #2.47 [ENDORSED]
Replies: 1
Views: 438

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 ...
by Julia_Gordon_2A
Fri Oct 14, 2016 4:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019357

Re: Post All Chemistry Jokes Here

How many moles are in a guacamole?


Avocado's number.
by Julia_Gordon_2A
Sat Oct 08, 2016 5:33 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019357

Chemistry Jokes

Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now.
by Julia_Gordon_2A
Tue Sep 27, 2016 6:45 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations
Replies: 3
Views: 613

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!
by Julia_Gordon_2A
Mon Sep 26, 2016 9:45 pm
Forum: Student Social/Study Group
Topic: Chem 14A Delta Terrace Study Group!
Replies: 3
Views: 546

Re: Chem 14A Delta Terrace Study Group!

I'd be interested too! Want to meet around 4 or so?

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