Search found 22 matches
- Fri Mar 17, 2017 12:20 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 2013 Final Practice Exam, Question 4a; n=?
- Replies: 6
- Views: 1914
Re: 2013 Final Practice Exam, Question 4a; n=?
I believe each oxygen in the O2 in the reactants initially has an oxidation number of 0, while in the product all 4 oxygens have an oxidation number of -2. This would make each Fe in the product have an oxidation number of +2, while in the reactants each Fe had an oxidation number of 0. Thus, each F...
- Mon Mar 13, 2017 3:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
I know many chemistry jokes, but I fear they may not get a good reaction.
- Mon Mar 06, 2017 4:14 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
Why do hamburgers have a lower energy than steak?
Because they're in the ground state.
Because they're in the ground state.
- Mon Feb 27, 2017 3:09 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
Sulfur + Tungsten + Silver --> SWAG
- Mon Feb 20, 2017 11:36 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
- Sat Feb 18, 2017 8:44 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
A student is very late to his chemistry lab class, arriving when there are only 5 minutes left. Realizing he won't have time to complete the lab, which involves looking at a sample of water under a microscope and recording observations, the student scribbles in his notebook "I saw twice as many...
- Sat Feb 11, 2017 11:31 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation at 25 degrees? [ENDORSED]
- Replies: 1
- Views: 3341
Nernst Equation at 25 degrees? [ENDORSED]
On the bottom of Page 51 of the Course Reader, it displays the Nernst Equation. Then, on the next page, it says that at 25 degrees Celsius, it has 2.303RT/F = 0.059V, then E (cell) = E (standard) - 0.0592 / n Log (10) Q. Where did the "2.303" come from? And shouldn't it be lnQ as it is in ...
- Mon Jan 30, 2017 3:34 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
Why was the mole of oxygen so happy when she left the bar?
Because she got Avogadro's number.
Because she got Avogadro's number.
- Wed Jan 25, 2017 9:29 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
It's always good to have a positive attitude instead of having an electron cloud hanging around your head.
- Wed Jan 25, 2017 9:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
What is a cation afraid of?
A dogion!
A dogion!
- Fri Jan 13, 2017 11:34 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
You don't know the 5th element of the periodic table?
What a boron!
What a boron!
- Mon Nov 28, 2016 1:58 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
If the Silver Surfer and Ironman teamed up, they'd be alloys.
- Fri Nov 25, 2016 10:37 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
Optimist: The glass is half-full.
Pessimist: The glass is half-empty.
Chemist: The glass contains H2O and other compounds.
Pessimist: The glass is half-empty.
Chemist: The glass contains H2O and other compounds.
- Mon Nov 14, 2016 12:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3590673
Re: Post All Chemistry Jokes Here
I asked the guy sitting next to me if he had any sodium hypobromite. His response: NaBrO.
If a king farts, is it a noble gas?
How do you make a 24M solution?
Put a set of artificial teeth in water.
If a king farts, is it a noble gas?
How do you make a 24M solution?
Put a set of artificial teeth in water.
- Mon Nov 07, 2016 8:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Expanded Valence Shell Electrons
- Replies: 2
- Views: 895
Re: Expanded Valence Shell Electrons
For atoms like P, S, and Cl, it is possible for them to have a different number of electrons that are more than 8. The reason for this is because their d-orbitals are able to accept additional electrons. Since there are multiple d-orbitals available, the # of valence electrons does not have to be co...
- Mon Oct 31, 2016 2:19 pm
- Forum: Hybridization
- Topic: Hybridization Beyond sp3
- Replies: 2
- Views: 797
Re: Hybridization Beyond sp3
Usually hybrid orbitals beyond sp3 do not appear on the midterm. However, it would be the safest bet to know the hybridizations covered in the course reader, which includes two hybrid orbitals beyond sp3: dsp3 and d2sp3 (page 103).
- Mon Oct 24, 2016 3:00 pm
- Forum: General Science Questions
- Topic: Isoelectronic
- Replies: 4
- Views: 3890
Re: Isoelectronic
Isoelectronic atoms are those that have the same # of electrons. Thus, no two different elements in non-cation, non-anion form can be isoelectronic. However, atoms of two different elements can be isoelectronic if one of the atoms is a cation or an anion. For example, K has one more atom than Neon. ...
- Mon Oct 17, 2016 2:36 pm
- Forum: General Science Questions
- Topic: A Very Hypothetical Question
- Replies: 1
- Views: 1193
Re: A Very Hypothetical Question
You will probably spend your entire life trying to make bricks out of the elements at the bottom.
- Mon Oct 10, 2016 2:55 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Equation Module Question
- Replies: 1
- Views: 626
De Broglie Equation Module Question
"Calculate the wavelength of a 275 kg electric car traveling at a speed of 125 km/hr. Do electric cars have wavelike properties?" My question here isn't how to calculate the wavelength but rather the second part of whether the car has wavelike properties. The wording of this question made ...
- Mon Oct 03, 2016 5:40 pm
- Forum: Significant Figures
- Topic: Significant figures in textbook Ex. 1.7 (p. 18) [ENDORSED]
- Replies: 2
- Views: 758
Re: Significant figures in textbook Ex. 1.7 (p. 18) [ENDORSED]
The "2" means that the products of the numbers after it in the denominator have to be doubled. It is not a value that is obtained from the question itself, but rather from principle. Therefore, it is more like 2.000000000000... and the denominator is exactly doubled. Therefore, the "2...
- Wed Sep 28, 2016 2:03 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Unit Kg
- Replies: 3
- Views: 937
Re: SI Unit Kg
As far as I've seen, in chemistry it is more common to put your answer in grams while in physics it is more common to put your answer in kilograms. In chemistry, however, unless the problem states otherwise, you should be able to put your answer in both kilograms or grams, whichever way your prefer,...
- Fri Sep 23, 2016 2:51 pm
- Forum: Empirical & Molecular Formulas
- Topic: Mole Ratio: Whole Number Ratios vs. Decimal Ratios
- Replies: 3
- Views: 11020
Re: Whole Number Ratios vs. Decimal Ratios
If it's asking for a mole ratio, then leaving it in decimal form should be alright, as I've seen a few examples of mole ratios that are in decimal form. If you change it to whole numbers, that's also fine.