Search found 23 matches
- Sun Mar 19, 2017 1:12 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: k'
- Replies: 4
- Views: 1093
Re: k'
It doesn't have anything to do with the differentiation of the rate constant. It is just the reverse rate - we can use it to find K.
- Sun Mar 12, 2017 6:46 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654673
Re: Post All Chemistry Jokes Here
Organic chemistry is really difficult. Those who study it have alkynes of trouble.
- Sun Mar 05, 2017 10:15 pm
- Forum: *Electrophiles
- Topic: Rxn steps
- Replies: 2
- Views: 1334
Rxn steps
How do you know which step of an organic reaction will occur first (nucleophile or electrophile)? Or do these steps occur simultaneously?
- Thu Feb 23, 2017 11:15 pm
- Forum: *Electrophiles
- Topic: BF3
- Replies: 2
- Views: 743
BF3
Why is BF3 considered an electrophile?
- Sun Feb 19, 2017 9:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654673
Re: Post All Chemistry Jokes Here
Since we are studying kinetics:
In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race.
When the chemical kinetics specialist is asked why he ran slowly, his reply was "I always wanted to be the significant rate determining step."
In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race.
When the chemical kinetics specialist is asked why he ran slowly, his reply was "I always wanted to be the significant rate determining step."
- Sun Feb 12, 2017 1:23 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654673
Re: Post All Chemistry Jokes Here
Why did the acid go to the gym? To get buffer. Two atoms were walking down the street one day, when one of them exclaimed. "Oh no - I've lost an electron!" "Are you sure?" the other one asked. "Yes," replied the first one, "I'm positive." How do you pick out a...
- Sun Feb 05, 2017 4:17 pm
- Forum: Balancing Redox Reactions
- Topic: Intensive property
- Replies: 4
- Views: 898
Intensive property
Can someone explain why standard reduction potential is an intensive property, versus an extensive property? I'm still confused as to why standard reduction potential is considered a intensive property.
- Fri Jan 27, 2017 12:24 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy when P isn't constant
- Replies: 1
- Views: 478
Entropy when P isn't constant
In the textbook, the entropy change when P is not constant is given by:
delta S = nRln(P1/P2)
Why would the initial pressure be on top, rather than the final pressure?
delta S = nRln(P1/P2)
Why would the initial pressure be on top, rather than the final pressure?
- Thu Jan 26, 2017 11:55 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal?
- Replies: 2
- Views: 761
Re: Isothermal?
An isothermal reaction just means that during the reaction, T (temperature) stays the same, or is constant. That means delta T (change in T) equals zero. R is the gas constant, which Dr. Lavelle gives us on the formula sheet, so you don't have to memorize the values, but be aware that depending on t...
- Thu Jan 19, 2017 8:55 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW 8.57
- Replies: 2
- Views: 732
HW 8.57
The question asks to determine the reaction enthalpy for the hydrogenation of ethyne to ethane, C2H2(g) + 2H2(g) -> C2H6(g). What happens when we hydrogenate something? What do we add to the equation?
- Tue Jan 10, 2017 8:39 pm
- Forum: Calculating Work of Expansion
- Topic: How to achieve maximum work from an electric battery?
- Replies: 4
- Views: 789
How to achieve maximum work from an electric battery?
In the book, a thinking point asks how to achieve maximum work from an electric battery. I'm having trouble conceptually solving this question. Would we increase the external pressure?
- Thu Dec 01, 2016 11:43 pm
- Forum: Bronsted Acids & Bases
- Topic: Weak Acid
- Replies: 4
- Views: 1088
Re: Weak Acid
The bond strength is a large determining factor for acidity. The bond between HF is very strong, because fluorine does not want to let go of hydrogen.
- Sat Nov 26, 2016 5:08 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Can you classify acids as strong or weak from their formulas alone? [ENDORSED]
- Replies: 7
- Views: 1746
Can you classify acids as strong or weak from their formulas alone? [ENDORSED]
Can you classify acids as strong or weak from their formulas alone?
- Tue Nov 22, 2016 7:11 pm
- Forum: General Science Questions
- Topic: Why can't hydrogen ions exist by themselves?
- Replies: 1
- Views: 1830
Why can't hydrogen ions exist by themselves?
Why can't hydrogen ions exist by themselves?
- Mon Nov 21, 2016 12:35 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Is a negative pH possible? [ENDORSED]
- Replies: 2
- Views: 780
Is a negative pH possible? [ENDORSED]
When asked to determine the pH, is it ever possible to get a negative pH?
- Sun Nov 13, 2016 9:19 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MO Diagram
- Replies: 1
- Views: 475
MO Diagram
If we have a heteronuclear molecule with one atom with less than 8 electrons, and the other with more than 8 electrons, which MO diagram will we use?
- Sat Nov 12, 2016 9:41 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 152011
Re: Reading the textbook
I read the book and find it helps a lot when understanding difficult topics. They can use different symbols which can be confusing, but overall it helps me out a lot. Also doing the self-tests when going through the reading give me confidence when learning the content.
- Sun Nov 06, 2016 5:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654673
Re: Post All Chemistry Jokes Here
What is the chemical formula for seawater?
CH2O
CH2O
- Sun Oct 30, 2016 5:20 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654673
Re: Post All Chemistry Jokes Here
A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
- Fri Oct 21, 2016 4:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654673
Re: Post All Chemistry Jokes Here
Chemists...
You have to keep an ion them.
You have to keep an ion them.
- Sun Oct 16, 2016 4:48 pm
- Forum: General Science Questions
- Topic: Does 10 inches of snow equal 1 inch of rain?
- Replies: 1
- Views: 1245
Does 10 inches of snow equal 1 inch of rain?
I read somewhere a while back that 10 inches of snow equals 1 inch of rain. If so, how does that work?
- Sat Oct 08, 2016 10:39 pm
- Forum: Einstein Equation
- Topic: 1.27 [ENDORSED]
- Replies: 1
- Views: 1171
1.27 [ENDORSED]
Q: A lamp rated at 32W (1W = 1J/s) emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2.0s? How many moles of photons are emitted in that time interval? So for the first part, it would be 64J. From there, I used E=hv and v=c/wavelength to get E=hc/wavel...
- Thu Sep 29, 2016 5:22 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 1.57 [ENDORSED]
- Replies: 5
- Views: 2165
1.57 [ENDORSED]
Lines in the Balmer series of the hydrogen spectrum are observed at 653.6, 486.1, 434.0, and 410.2 nm. What is the wavelength of the next line in the series?
I am totally lost on this question. How would I find the wavelength of the next line in this series?
I am totally lost on this question. How would I find the wavelength of the next line in this series?