Q: Why does hamburger yield lower energy than steak?
A: Because it's in the ground state.
Search found 34 matches
- Fri Feb 17, 2017 10:51 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
- Sun Feb 12, 2017 10:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
Re: Post All Chemistry Jokes Here
Q: What do you do with a dead chemist?
A: Barium
A: Barium
- Thu Feb 09, 2017 4:57 pm
- Forum: Balancing Redox Reactions
- Topic: 14.5 Half Reactions
- Replies: 4
- Views: 1980
Re: 14.5 Half Reactions
OHHHH..I think I understand what you mean Professor. Please correct me if I am wrong, O3 reacts with BrO3-; therefore, O3 is an oxidizing agent because O3 oxidation number is 0 while Br oxidation number is +5 Br- reacts with O2; therefore, Br- is a reducing agent because Br- oxidation number is -1 w...
- Thu Feb 09, 2017 4:51 pm
- Forum: Balancing Redox Reactions
- Topic: 14.5 Half Reactions
- Replies: 4
- Views: 1980
Re: 14.5 Half Reactions
Hi,
But for this problem, the solution says that O3 is the oxidizing agent and Br- is the reducing agent.
I thought both O3 and Br- are oxidizing agent..
When both O3 and O2 have oxidation number "0", how do we determine whether it is oxidizing or reducing?
Thanks,
But for this problem, the solution says that O3 is the oxidizing agent and Br- is the reducing agent.
I thought both O3 and Br- are oxidizing agent..
When both O3 and O2 have oxidation number "0", how do we determine whether it is oxidizing or reducing?
Thanks,
- Tue Feb 07, 2017 6:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
Re: Post All Chemistry Jokes Here
GOT MOLE PROBLEMS?
CALL AVOGADRO AT 602-1023
LOLOLOLOLLLLLLLLLL,
CALL AVOGADRO AT 602-1023
LOLOLOLOLLLLLLLLLL,
- Wed Feb 01, 2017 6:31 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Homework Problem 9.15(b)
- Replies: 2
- Views: 539
Re: Homework Problem 9.15(b)
GOT IT....
THANKS!!
THANKS!!
- Wed Feb 01, 2017 1:22 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Book example problem 9.6
- Replies: 2
- Views: 521
Re: Book example problem 9.6
AH..
Got it..
Thanks!!
Got it..
Thanks!!
- Mon Jan 30, 2017 10:00 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Homework Problem 9.15(b)
- Replies: 2
- Views: 539
Homework Problem 9.15(b)
Hello,
I am wondering why the book use standard enthalpy of vaporization of 43.5kJ per mol instead of 40.7kJ per mol or 44.0 kJ per mol in homework problem 9.15(b)
I am wondering why the book use standard enthalpy of vaporization of 43.5kJ per mol instead of 40.7kJ per mol or 44.0 kJ per mol in homework problem 9.15(b)
- Mon Jan 30, 2017 6:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruincast Audio Problem
- Replies: 16
- Views: 2826
Re: Bruincast Audio Problem
You need to download something called "silver light" , and sometimes is difficult to play.
Internet browser is better or apple's safari browser is fine too.
Internet browser is better or apple's safari browser is fine too.
- Mon Jan 30, 2017 11:08 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
Re: Post All Chemistry Jokes Here
How about the chemical workers — are they unionized?
- Mon Jan 30, 2017 11:03 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Book example problem 9.6
- Replies: 2
- Views: 521
Book example problem 9.6
Hi,
The book example on 9.6, I do not quite understand the cooling of acetone vapor from boiling to desired temperature, why does the equation use heat capacity Cp,m=4R ?
Thanks!
The book example on 9.6, I do not quite understand the cooling of acetone vapor from boiling to desired temperature, why does the equation use heat capacity Cp,m=4R ?
Thanks!
- Tue Jan 24, 2017 9:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruincast Audio Problem
- Replies: 16
- Views: 2826
Re: Bruincast Audio Problem
Hi,
Thank you Professor.
I have contacted the technician, and bruincast is working great now!
Thanks,
Thank you Professor.
I have contacted the technician, and bruincast is working great now!
Thanks,
- Mon Jan 16, 2017 7:48 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Error in the text book?
- Replies: 1
- Views: 460
Error in the text book?
Hi,
On page 293, Example problem 8.9, step 2 states that there is 4H2O2 in the reaction.
I cannot seem to figure out where is the 4H2O2 come from.
Would it be an error?
Thanks,
On page 293, Example problem 8.9, step 2 states that there is 4H2O2 in the reaction.
I cannot seem to figure out where is the 4H2O2 come from.
Would it be an error?
Thanks,
- Mon Jan 16, 2017 7:44 am
- Forum: Administrative Questions and Class Announcements
- Topic: Bruincast Audio Problem
- Replies: 16
- Views: 2826
Re: Bruincast Audio Problem
Yea, it happens in all three different lectures for every recorded sessions.
- Sun Jan 15, 2017 5:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruincast Audio Problem
- Replies: 16
- Views: 2826
Bruincast Audio Problem
Hi Professor,
The Bruincast video and audio seem to have lacking of output. Many of the full sentences that were spoked were not recorded.
Just want to bring to your attention.
Thanks,
The Bruincast video and audio seem to have lacking of output. Many of the full sentences that were spoked were not recorded.
Just want to bring to your attention.
Thanks,
- Sun Dec 04, 2016 12:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
Re: Post All Chemistry Jokes Here
What Is The Chemical Formula For Coffee?
A. CoFe2
LOLOLOLLLL..
A. CoFe2
LOLOLOLLLL..
- Fri Dec 02, 2016 7:49 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: 5 Percent Rule
- Replies: 4
- Views: 1215
Re: 5 Percent Rule
I understand the fact that spending $100 is no different for a billionaire. But how does the 5% rule work in the context of solving x? How do we determine when to use the 5% rule? When do we use it????
Thanks,
Thanks,
- Sat Nov 26, 2016 5:12 pm
- Forum: Amphoteric Compounds
- Topic: Difference between Amphoteric and Amphiprotic
- Replies: 2
- Views: 3423
Difference between Amphoteric and Amphiprotic
Hi,
What is the difference between Amphoteric and Amphiprotic?
Also, what is the relationship between Amphiprotic and Autoprotolysis?
Thanks,
Josh
What is the difference between Amphoteric and Amphiprotic?
Also, what is the relationship between Amphiprotic and Autoprotolysis?
Thanks,
Josh
- Sat Nov 26, 2016 4:37 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
Re: Post All Chemistry Jokes Here
A proton, a neutron, and helium walk into a bar and order three beers. The bartender appears with 3 beers and asks the proton, “Are you sure you’re over 21?” The proton replies, “I’m positive.” So the bartender gives him the first beer. He gives the second beer to the neutron and says, “For you, no ...
- Fri Nov 18, 2016 1:17 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3009337
Re: Post All Chemistry Jokes Here
First of all why do Chemistry graduates typically work in the Pharmaceutical industry, while Pharmacy graduates typically work in a Chemist shop? Anyway, the missus and I are both science graduates, Chemistry for her, and Physics and Computer Science for me. So typical conversations might be… I told...
- Sat Nov 12, 2016 2:59 pm
- Forum: Naming
- Topic: Negative charge. Add Ate to the end
- Replies: 3
- Views: 777
Re: Negative charge. Add Ate to the end
Hi,
How do you know the compound has a negative has a charge of -3?
How do you know the compound has a negative has a charge of -3?
- Sat Nov 12, 2016 2:57 pm
- Forum: Naming
- Topic: Naming Ligands
- Replies: 1
- Views: 831
Naming Ligands
Hi,
K3[CoF6], on the course reader, it is named: potassium-hexa-fluoro-cobaltate(III)
Why is it not: potassium-hexa-fluoro-cobalt(III)?
It does not have a negative charge in the complex...Don't we only add ate to complexes that have negative charge?
Thanks,
K3[CoF6], on the course reader, it is named: potassium-hexa-fluoro-cobaltate(III)
Why is it not: potassium-hexa-fluoro-cobalt(III)?
It does not have a negative charge in the complex...Don't we only add ate to complexes that have negative charge?
Thanks,
- Sat Nov 12, 2016 1:32 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Chapter 4 Problem 51
- Replies: 1
- Views: 412
Re: Chapter 4 Problem 51
Hi Emerald, I think the solution is written in a way just to show us the complete molecular orbitals when drawing the diagram for Li. I think it would be better to know the complete molecular orbital diagram and draw it out every time. Because you draw the diagram differently for Z<8 and Z>or = 8
- Wed Oct 12, 2016 7:07 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Clarification on ENERGY LEVEL concept
- Replies: 3
- Views: 2091
Clarification on ENERGY LEVEL concept
Hi, I have noticed that from the book(page 7 in chapter 1), atomic spectra calculation done by Rydberg could be written using the formula: v(frequency)=R[1/n1^2-1/n2^2]. However, in the course reader, we have done the example on page 48 using a different formula: Change of E=E(final)-E(initial) E(n)...
- Tue Oct 11, 2016 3:39 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Quiz 1 Fall 2015 #5 [ENDORSED]
- Replies: 2
- Views: 744
Re: Quiz 1 Fall 2015 #5 [ENDORSED]
YOU ARE AMAZING!
- Tue Oct 11, 2016 1:54 pm
- Forum: Balancing Chemical Reactions
- Topic: Naming Chemical Formula and Balancing Chemical Equations [ENDORSED]
- Replies: 5
- Views: 1982
- Tue Oct 11, 2016 1:51 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Quiz 1 Fall 2015 #5 [ENDORSED]
- Replies: 2
- Views: 744
Quiz 1 Fall 2015 #5 [ENDORSED]
6.40 g of a compound was burned in air and produced 8.80 g of CO2 and 7.20 g of H20. Find the empirical formula of the compound.
I do not know how to approach this kind of problems.
Thanks!
I do not know how to approach this kind of problems.
Thanks!
- Tue Oct 11, 2016 1:48 pm
- Forum: Balancing Chemical Reactions
- Topic: Quiz 1 Prep Fall 2015
- Replies: 2
- Views: 1977
Quiz 1 Prep Fall 2015
Aluminum and hydrogen chloride, HCI, react to form aluminum chloride in solution, AlCl3, and hydrogen gas. Balanced equation: 2Al + 6HCl -------> 2AlCl3 + 3H2 Question: If you had 5.43 g of aluminum and 7.80 g of hydrogen chloride, how many grams of AlCl3 would you get? I could not figure out where ...
- Tue Oct 11, 2016 1:31 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: quiz 1 fall 2014 prep #10
- Replies: 3
- Views: 955
Re: quiz 1 fall 2014 prep #10
Hi,
Where does the number -2.178x10^-18J come from??
Where does the number -2.178x10^-18J come from??
- Tue Oct 11, 2016 1:16 pm
- Forum: Balancing Chemical Reactions
- Topic: Naming Chemical Formula and Balancing Chemical Equations [ENDORSED]
- Replies: 5
- Views: 1982
Re: Naming Chemical Formula and Balancing Chemical Equations [ENDORSED]
Hi Michelle,
How do you know that nitrogen and oxygen are N2 and O2, which is in gas state?
How do you know that nitrogen and oxygen are N2 and O2, which is in gas state?
- Tue Oct 11, 2016 1:08 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Quiz 1 Prep
- Replies: 2
- Views: 608
Re: Quiz 1 Prep
THANK YOU!
- Tue Oct 11, 2016 7:50 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Quiz 1 Prep
- Replies: 2
- Views: 608
Quiz 1 Prep
Hard Water is water that has high mineral content, mainly calcium ions(Ca2+) and magnesium ions(Mg2+). A concentration above 5.30x10^-3 is considered to be very hard water. Assuming that there are no magnesium ions present, is a 0.400 L solution of 0.120 g CaCO3 and 0.155 g CaSO4 very hard water? To...
- Tue Oct 11, 2016 7:43 am
- Forum: Photoelectric Effect
- Topic: Quiz 1 Prep [ENDORSED]
- Replies: 1
- Views: 1014
Quiz 1 Prep [ENDORSED]
The work function for lithium is 4.6x10^-19 J 1) Calculate the lowest frequency of light that will cause photoelectric emission. 2) What is the maximum energy of the electrons emitted when light of 7.3x10^14 Hz is used? 1) When it asks for lowest frequency, I look at it as it means longest wavelengt...
- Thu Oct 06, 2016 7:56 pm
- Forum: Balancing Chemical Reactions
- Topic: Naming Chemical Formula and Balancing Chemical Equations [ENDORSED]
- Replies: 5
- Views: 1982
Naming Chemical Formula and Balancing Chemical Equations [ENDORSED]
Question:
When nitrogen and oxygen react in the cylinder of an automobile engine, nitric oxide, NO, is formed. Write a balanced equation for this reaction.
Comment:
I do not know how to write this formula out and then balance it. Nitrogen and oxygen both have negative charge. Please advise..
When nitrogen and oxygen react in the cylinder of an automobile engine, nitric oxide, NO, is formed. Write a balanced equation for this reaction.
Comment:
I do not know how to write this formula out and then balance it. Nitrogen and oxygen both have negative charge. Please advise..