Search found 39 matches
- Thu Mar 16, 2017 11:25 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Details and Review Sessions Winter 2017
- Replies: 114
- Views: 27426
Re: Final Exam Details and Review Sessions Winter 2017
Not particularly related to the final itself, but for future reference - will we still have access to Chemistry Community after this quarter ends? Chem community is a public site, so you do not even need an account to see the forum posts and replies. you can see posts, but if our login does not wor...
- Sun Mar 12, 2017 3:45 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Cyclo-isomers
- Replies: 4
- Views: 856
Re: Cyclo-isomers
Sophia Rawson 1C wrote:I could be wrong but I believe I drew cyclopropane with an ethyl substituent, cyclobutane with a methyl substituent, and cyclopentane
You are correct
- Wed Mar 08, 2017 10:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2017
- Replies: 183
- Views: 30192
Re: Quiz 3 Winter 2017
Teddy_Rosenbluth wrote:Would vinyls be considered functional groups and therefor we don't need to know it for Quiz 3?
I had this question as well, but im pretty sure it wont be on the quiz.
- Fri Mar 03, 2017 4:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 25699
Re: Quiz 2 Winter 2017
Is there a reason why number six's answer has three significant figures despite the given concentration 0.35M having two significant figures? Do we not bother with sig figs when ln is involved? My TA told me today that there are some weird rules that apply to sig figs with logs and natural logs and...
- Fri Mar 03, 2017 4:44 pm
- Forum: *Electrophiles
- Topic: Bruincast Friday 2/24
- Replies: 5
- Views: 1446
Re: Bruincast Friday 2/24
Do you guys know if the review session is gonna be recorded today or not?
- Thu Feb 23, 2017 8:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 25699
Re: Quiz 2 Winter 2017
chris2E wrote:Is there a reason why number six's answer has three significant figures despite the given concentration 0.35M having two significant figures? Do we not bother with sig figs when ln is involved?
Number 6's answer is 0.30M, that's 2 sig figs. And there is no ln involved
- Thu Feb 23, 2017 4:52 pm
- Forum: Second Order Reactions
- Topic: Slow and Fast Steps [ENDORSED]
- Replies: 2
- Views: 1618
Re: Slow and Fast Steps [ENDORSED]
This was so helpful! thank youu
- Sun Feb 19, 2017 8:53 pm
- Forum: Student Social/Study Group
- Topic: Study Group Chem 14B
- Replies: 5
- Views: 1272
Re: Study Group Chem 14B
I'm down
- Wed Feb 15, 2017 1:40 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Enthalpy Predictions
- Replies: 1
- Views: 569
Re: Enthalpy Predictions
The entropy of the system decreases while the entropy of the surroundings increases. This is because we had 2 reactants compared to 1 product, and thus the entropy of the reactants is higher than that of the product.
- Sun Feb 12, 2017 3:09 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
Did you know that you can cool yourself to -273.15˚C and still be 0k?
- Wed Feb 08, 2017 1:42 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
I like chemistry jokes periodically.
- Wed Feb 08, 2017 1:37 pm
- Forum: General Science Questions
- Topic: quiz 1
- Replies: 3
- Views: 1032
Re: quiz 1
He also announced that the midterm will cover up to the end of electrochemistry, just in case you were not informed yet.
- Wed Feb 01, 2017 12:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
What kind of fish is made up of 2 sodium atoms?
TuNa
TuNa
- Wed Feb 01, 2017 12:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1: Formulas We Need To Know
- Replies: 2
- Views: 691
Re: Quiz 1: Formulas We Need To Know
I'm fairly certain that most of the important ones that we will need will be on there and if not,it would be ones that we can derive.
- Thu Jan 26, 2017 4:15 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
Q: What do you call a clown who's in jail?
A: A silicon.
A: A silicon.
- Thu Jan 26, 2017 4:08 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Isothermal reversible systems
- Replies: 2
- Views: 709
Re: Isothermal reversible systems
And this equation works because isothermal means that the temperature stays constant, thus we don't need an initial and final temperatures, the initial temp will do.
- Sun Jan 22, 2017 6:08 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Relationship Between Volume and # of States
- Replies: 1
- Views: 494
Re: Relationship Between Volume and # of States
I believe it has to do with the equation: deltaS=nRln(V2/V1)
- Wed Jan 18, 2017 7:11 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calculating work
- Replies: 2
- Views: 639
Calculating work
Today we learned how to use the integral to calculate the work done under constant pressure.
I was wondering whether we can use integrals to calculate work if the pressure is not constant, and if so, how?
I was wondering whether we can use integrals to calculate work if the pressure is not constant, and if so, how?
- Wed Jan 11, 2017 7:29 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
Chemistry is like cooking, just don't lick the spoon.
- Wed Jan 11, 2017 7:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
you're a 10?
Maybe on a pH scale,
cause you're basic.
Maybe on a pH scale,
cause you're basic.
- Sat Dec 03, 2016 4:38 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Elecrons
- Replies: 2
- Views: 594
Re: Elecrons
you also have to think about the fact that electrons have the same charge and we know that alike charges repel and it would be very hard to get electrons to collide.
- Wed Nov 30, 2016 12:39 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
take all your lame chemistry jokes and Barium.
- Thu Nov 24, 2016 3:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
getting closer to the final exams, always remember to be like a proton and stay positive.
- Thu Nov 24, 2016 3:22 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: which is more acidic
- Replies: 3
- Views: 816
Re: which is more acidic
the H3- is electron-donating relative to hydrogen and it donates electrons to the carboxyl group which makes it more negative. This causes the acid to be weaker, because the proton now has to be separated from a more negative conjugate base. likewise, CH3CH2- is more electron-donating than CH3-, and...
- Fri Nov 18, 2016 10:00 am
- Forum: Administrative Questions and Class Announcements
- Topic: Formula for Coordination Compounds
- Replies: 1
- Views: 695
Re: Formula for Coordination Compounds
I believe in the formula the order does not matter, but when naming you must name in alphabetical order.
- Fri Nov 18, 2016 9:59 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE box
- Replies: 2
- Views: 1021
Re: ICE box
I believe they must be excluded from the ice box because they are not applicable in equilibrium, only gases and aqueous substances are.
- Mon Nov 14, 2016 2:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
How can you tell the difference between a chemist and a train driver?
ask them to pronounce unionized...
ask them to pronounce unionized...
- Mon Nov 14, 2016 2:47 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
sodium sodium sodium sodium sodium sodium sodium sodium sodium
BATMAN!
BATMAN!
- Wed Nov 09, 2016 12:34 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
What is the chemical formula for banana?
BaNa2
BaNa2
- Wed Nov 09, 2016 12:32 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Z
- Replies: 2
- Views: 695
Re: Z
it is the atomic number which is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- Wed Nov 09, 2016 12:30 pm
- Forum: Lewis Structures
- Topic: Quiz 2 prep
- Replies: 2
- Views: 722
Re: Quiz 2 prep
A mistake that i saw a lot of people make with this problem was that they drew the lewis structure in the most stable form(which we are always told to do) which would result in more than an octet for the central atom. But the question specifically asks us to use the octet rule, meaning no atom can h...
- Wed Nov 02, 2016 2:02 pm
- Forum: Lewis Structures
- Topic: Octet rule
- Replies: 7
- Views: 1196
Re: Octet rule
It cannot have an expanded octet.
- Wed Nov 02, 2016 2:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
What do you call an acid with an attitude? An a-mean-oh-acid.
- Wed Nov 02, 2016 1:59 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3978041
Re: Post All Chemistry Jokes Here
I have many chemistry jokes. I'm just afraid they won't get a good reaction.
- Thu Oct 27, 2016 4:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Presence of Lone Pairs [ENDORSED]
- Replies: 2
- Views: 603
Re: Presence of Lone Pairs [ENDORSED]
Dear Elle,
I'm a bit unclear about this as well. i believe that it does not matter where it is removed from because once it is removed and the lone pair is put, the other atoms will move and arrange in a way where they are as stable and far away from each other as possible.
I'm a bit unclear about this as well. i believe that it does not matter where it is removed from because once it is removed and the lone pair is put, the other atoms will move and arrange in a way where they are as stable and far away from each other as possible.
- Wed Oct 19, 2016 12:12 pm
- Forum: Resonance Structures
- Topic: Resonance and Energy [ENDORSED]
- Replies: 2
- Views: 738
Re: Resonance and Energy [ENDORSED]
Dear Emerald,
I understand that there are delocalized electron, which is why the energy is lower, but how does the electrons being delocalized result in a lower energy?
I understand that there are delocalized electron, which is why the energy is lower, but how does the electrons being delocalized result in a lower energy?
- Thu Oct 13, 2016 2:23 pm
- Forum: Trends in The Periodic Table
- Topic: Exceptions to the Periodic Trends
- Replies: 3
- Views: 6444
Re: Exceptions to the Periodic Trends
Hello Matt, I was wondering about that as well. For instance i know that as we move down the periodic table the radius increases due to the addition of electron shells, but the charge of the nucleus is also greater meaning it pulls the electrons in with a greater force. The trends are great for gene...
- Wed Oct 05, 2016 1:58 pm
- Forum: Properties of Electrons
- Topic: Constructive and Destructive Interference [ENDORSED]
- Replies: 3
- Views: 1748
Re: Constructive and Destructive Interference [ENDORSED]
what if the waves are neither lined up trough to peak, peak to peak, or trough to trough, and are rather lined up somewhere in the middle. then are they constructive or destructive? how does this work out?
- Mon Sep 26, 2016 7:05 pm
- Forum: Properties of Light
- Topic: Frequency, wavelength, and Energy of light
- Replies: 5
- Views: 1020
Frequency, wavelength, and Energy of light
Is the energy what determines whether or not a wave is harmful to humans? or does it have to do with the frequency or wavelength?