Search found 16 matches
- Sat Mar 18, 2017 11:11 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2981366
Re: Post All Chemistry Jokes Here
I would like to apologize for not adding more jokes, but I only post them periodically
- Sun Mar 05, 2017 3:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2981366
- Wed Feb 22, 2017 4:32 pm
- Forum: General Rate Laws
- Topic: Self-Test 15.2A
- Replies: 1
- Views: 504
Self-Test 15.2A
The average rate of the reaction N2(g) + 3 H2(g) --> 2 NH3(g) over a certain period is reported as 1.15 (mmol NH3)*L -1 *h -1 . (a) What is the average rate over the same period in terms of the consumption of H2? (b) What is the unique average rate? For part (a), I am unsure of how to go about solvi...
- Sat Feb 11, 2017 3:25 pm
- Forum: Balancing Redox Reactions
- Topic: Self-Test 14.1A [ENDORSED]
- Replies: 1
- Views: 458
Self-Test 14.1A [ENDORSED]
Question: Copper reacts with dilute nitric acid to form copper (II) nitrate and the gas nitric oxide, NO. Write the net ionic equation for the reaction. I would just like to clarify if this is the correct skeletal equation to go about solving the problem: Cu(s) + HNO_{3} (aq) --> Cu^...
- Thu Feb 02, 2017 2:04 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Self-Test 9.15A
- Replies: 1
- Views: 509
Self-Test 9.15A
Calculate the entropy change of the surroundings when 1.00 mol H2O(l) vaporizes at 90°C and 1 bar. Take the enthalpy of vaporization of water as
40.7 kJ*mol-1.
For this problem, you do not need to set the 40.7 kJ*mol-1 negative because it is already given at the vaporization stage correct?
40.7 kJ*mol-1.
For this problem, you do not need to set the 40.7 kJ*mol-1 negative because it is already given at the vaporization stage correct?
- Wed Jan 25, 2017 6:34 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Quiz 1 Prep #5
- Replies: 5
- Views: 2788
Re: Quiz 1 Prep #5
As mentioned above, it is probably a typo as without the coefficient of 2 NH3, the chemical equation itself would be unbalanced.
- Sat Jan 14, 2017 2:38 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Question about using mean bond enthalpies to estimate the enthalpy of a reaction
- Replies: 1
- Views: 388
Question about using mean bond enthalpies to estimate the enthalpy of a reaction
One of the textbook questions list the following: Use bond enthalpies to estimate the standard enthalphy of the reaction... CCl 3 CHCl 2 (g) + 2 HF (g) ---> CCl 3 CHF 2 (g) + 2 HCl (g) The answer the the question is -24 kJ/mol, but when I try and calculate it on my own I keep getting -30 kJ/mol. I w...
- Sat Dec 03, 2016 7:16 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: D-block exceptions for midterm and f-block
- Replies: 4
- Views: 1152
Re: D-block exceptions for midterm and f-block
Thank you for posting this, saved me quite a bit of studying.
- Sun Nov 27, 2016 11:07 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2981366
Re: Post All Chemistry Jokes Here
I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO
He said NaBrO
- Wed Nov 16, 2016 10:52 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Correct way to write molecular configuration?
- Replies: 1
- Views: 425
Correct way to write molecular configuration?
Do we need to specify the specific p-states? For example, for C 2 , is the correct configuration: 1. (\sigma 2s)^2(\sigma* 2s)^2(\sigma 2pz)^2(\pi 2px)^1(\pi 2py)^1 or 2. (\sigma 2s)^2(\sigma* 2s)^2(\sigma 2pz)^2(\pi 2p)^2 Basic...
- Sun Nov 13, 2016 9:51 am
- Forum: Biological Examples
- Topic: Fe and proteins
- Replies: 6
- Views: 1091
Re: Fe and proteins
thank you for clearing this up, had some difficulty in this as well
- Mon Nov 07, 2016 8:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2981366
Re: Post All Chemistry Jokes Here
Why was there a warrant out for Sodium?
It was wanted for assault (a salt)
It was wanted for assault (a salt)
- Sat Nov 05, 2016 7:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruincast
- Replies: 26
- Views: 10513
Re: Bruincast
As mentioned above, just download the lectures onto your Desktop and then you can set the playback speed on a video player such as QuickTime for Mac
- Sun Oct 30, 2016 6:41 pm
- Forum: Trends in The Periodic Table
- Topic: Quiz 2 Typo?
- Replies: 3
- Views: 885
Re: Quiz 2 Typo?
So it wasn't just me that was thinking that haha nice
- Sun Oct 16, 2016 3:31 pm
- Forum: Properties of Light
- Topic: HW Question Ch #27 [ENDORSED]
- Replies: 5
- Views: 2203
Re: HW Question Ch #27 [ENDORSED]
I had a similar question, but I am still confused about how it is 6.022X10^23 photons per mole. Is it just a known constant that just like atoms there are a certain number of photons per mole? 6.022x10^23 is a constant that can be expressed as per mole of anything. As stated above, it can represent...
- Thu Sep 29, 2016 10:17 am
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chem Eq Audio Visual Post-Assess #8
- Replies: 2
- Views: 620
Re: Balancing Chem Eq Audio Visual Post-Assess #8
To calculate the net number of moles of gas produced, you take the difference of the sum of the coefficients of the reactant by the sum of the coefficients of the product. Here is an illustrated format of how you would calculate it: Sum of Coefficients of the Product - Sum of Coefficients of the Rea...