Search found 24 matches
- Sat Mar 18, 2017 12:43 pm
- Forum: General Science Questions
- Topic: Winter Final 2013 Q4
- Replies: 1
- Views: 770
Winter Final 2013 Q4
I'm confused on how in part A, they were able to get n. Please help!!
- Fri Mar 17, 2017 2:32 pm
- Forum: Stereochemistry in Organic Compounds (Chirality, Stereoisomers, R/S, d/l, Fischer Projections)
- Topic: Cis vs. trans
- Replies: 1
- Views: 31946
Cis vs. trans
when do we use cis and trans on a molecule vs using Z and E? Does it matter?
- Tue Mar 14, 2017 7:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591025
Re: Post All Chemistry Jokes Here
Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.
A: If you can't helium, and you can't curium, then you might as well barium.
- Tue Mar 14, 2017 7:00 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Equatorial and axial bonds
- Replies: 4
- Views: 2114
Re: Equatorial and axial bonds
It doesn't matter if as long as you alternate.
- Mon Mar 13, 2017 11:51 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Equatorial and axial bonds
- Replies: 4
- Views: 2114
Equatorial and axial bonds
How do you identify an equatorial bond versus an axial bond?
- Mon Mar 13, 2017 11:39 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591025
Re: Post All Chemistry Jokes Here
What kind of bear dissolved in water?
A polar bear!
A polar bear!
- Sat Mar 04, 2017 4:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591025
- Wed Feb 22, 2017 1:10 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Speed of reaction
- Replies: 1
- Views: 630
Speed of reaction
How are you able to tell if one equation is faster than the other when it comes with an intermediate? Is it usually given that it is faster/sower?
- Wed Feb 08, 2017 3:31 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: What is N?
- Replies: 1
- Views: 487
What is N?
What does Professor Lavelle mean when he says n helps find the mechanism?
- Fri Feb 03, 2017 1:10 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: What has more enthalpy?
- Replies: 1
- Views: 1520
What has more enthalpy?
How do you find which molecule has a greater enthalpy? Does is just matter based on the state of the molecule or does it have to do with heat?
- Mon Jan 23, 2017 1:23 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.19 part a
- Replies: 1
- Views: 574
8.19 part a
How do you answer this I'm so confused.
Calculate the heat that must be supplied to a 500.0 g copper kettle containing 400.0 g of water to raise its temperature from 22.0 degrees C to the boiling point of water, 100.0degrees C.
Calculate the heat that must be supplied to a 500.0 g copper kettle containing 400.0 g of water to raise its temperature from 22.0 degrees C to the boiling point of water, 100.0degrees C.
- Sun Jan 22, 2017 6:00 pm
- Forum: Calculating Work of Expansion
- Topic: Changing L•atm to J [ENDORSED]
- Replies: 1
- Views: 598
Changing L•atm to J [ENDORSED]
I noticed in a lot of homework problems from chapter 8 that the solution guide would go from L•atm to J and I don't know how to do that. Another question I have is will we need to know that conversion for any quizzes and/or the midterm?
- Fri Jan 20, 2017 1:10 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible vs irreversible [ENDORSED]
- Replies: 2
- Views: 762
Reversible vs irreversible [ENDORSED]
What does irreversible expansion mean?
- Fri Jan 13, 2017 2:02 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591025
Re: Post All Chemistry Jokes Here
Q: Why can you never trust atoms? A: They make up everything.
- Tue Nov 29, 2016 12:33 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Identifying a strong acid
- Replies: 6
- Views: 2296
Identifying a strong acid
What is the cut off for an acid to be a strong acid versus being a weak one? Is a strong acid only 1 or 2 on the pH scale?
- Fri Nov 18, 2016 7:58 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591025
Re: Post All Chemistry Jokes Here
Hopefully nobody has grades like this here!!
- Thu Nov 03, 2016 6:01 pm
- Forum: Hybridization
- Topic: Dipole Moment
- Replies: 2
- Views: 738
Dipole Moment
When you have a dipole moment to figure out if a molecule is polar or non polar, does the arrow point from least electronegative to the most, or does it depend on the formal charge of each atom in the molecule like -1 and +1?
- Thu Oct 27, 2016 12:16 pm
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 3
- Views: 848
Expanded Octet
How do you know when you can have an expanded octet? Is it only in the D block or is it anything in the third period and down on the periodic table? Thank you!
- Wed Oct 19, 2016 2:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs. Covalent Bonds [ENDORSED]
- Replies: 2
- Views: 1009
Ionic vs. Covalent Bonds [ENDORSED]
I don't really understand why/how electronegativity determines a molecule having an ionic bond or a covalent bond. Can someone please help?
- Sat Oct 15, 2016 10:18 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz Grades
- Replies: 3
- Views: 930
Quiz Grades
Where can we find quiz/test grades?
- Fri Oct 14, 2016 3:30 pm
- Forum: Lewis Structures
- Topic: Lewis Structure Example on page 79 of Course Reader
- Replies: 1
- Views: 546
Lewis Structure Example on page 79 of Course Reader
On page 79 of the course reader, at the very bottom of the page, there is a diagram of how (NH4)2 SO4 should be portrayed with Lewis Structure. All of it made sense to me except there is the number 4 placed in front of the diagram showing SO4. Was that a typo or is there an actual reason that's ther...
- Thu Oct 06, 2016 6:01 pm
- Forum: Photoelectric Effect
- Topic: Question 1.33 (c) from the textbook [ENDORSED]
- Replies: 2
- Views: 876
Question 1.33 (c) from the textbook [ENDORSED]
The question 1.33 (c) asks "what is the wavelength of the radiation that caused photo ejection of the electron?" In part a, it tells you the velocity is 3.6 x 10^3 km/s and in part b, you find the frequency which is 1.66 x 10^(-17) J. In part C you're supposed to start out with finding the...
- Thu Oct 06, 2016 5:39 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect [ENDORSED]
- Replies: 12
- Views: 2693
Re: Photoelectric Effect [ENDORSED]
Larger wavelengths do "have photons." A larger wavelength of light may not eject an electron for a particular type of metal because the energy of the incident light, a.k.a the photons hitting the metal, depends on the frequency according to the equation E = hv, where E is the energy of th...
- Wed Sep 28, 2016 2:30 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect [ENDORSED]
- Replies: 12
- Views: 2693
Photoelectric Effect [ENDORSED]
During the lecture we discussed light acting in waves and in photons. I understood that you can increase the intensity of a large wavelength, but will not get ejected electrons. However, because the light is working as photons, does that mean that larger wavelengths don't have photons- since there a...