Search found 25 matches
- Fri Mar 17, 2017 11:25 pm
- Forum: *Cycloalkanes
- Topic: Carbon Number
- Replies: 1
- Views: 1162
Carbon Number
When naming cycloalkanes with substituents, how do we number the carbon atoms?? After we start with the functional group occupying the #1 carbon or numbering the carbon atoms by following the alphabetical order, do we count the the rest of the atoms clock-wisely or anti-clockwisely? or do we need to...
- Mon Mar 13, 2017 8:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
A chemistry professor couldn't resist interjecting a little philosophy into a class lecture. He interrupted his discussion on balancing chemical equations, saying, "Remember, if you're not part of the solution, you're part of the precipitate!
- Fri Mar 03, 2017 12:46 pm
- Forum: *Electrophilic Addition
- Topic: nucleophile and electrophile reactions
- Replies: 6
- Views: 3241
nucleophile and electrophile reactions
When we are writing the formulas for nucleophile and electrophile reactions, do we need to use arrows to indicate the movement of electrons?
- Mon Feb 27, 2017 8:47 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
Why do chemists like nitrates so much?
They're cheaper than day rates
They're cheaper than day rates
- Mon Feb 27, 2017 8:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell potential
- Replies: 4
- Views: 1006
Cell potential
when we calculate the standard cell potential of a redox reaction, how do we know if we should add two values or subtract. I am so confused.
- Mon Feb 20, 2017 5:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
The optimist sees the glass half full. The pessimist sees the glass half empty. The chemist sees the glass completely full, half with liquid and half with air.
- Mon Feb 20, 2017 5:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24332
Re: Quiz 2 Winter 2017
how many questions are included in quiz2?
- Sun Feb 05, 2017 11:42 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
Don't trust atoms, they make up everything.
- Sun Feb 05, 2017 11:39 pm
- Forum: Phase Changes & Related Calculations
- Topic: Random question
- Replies: 3
- Views: 899
Re: Random question
It depends on the substances that are involved in the reaction(number of bonds, bond enthalpies, etc.) or phase change.
- Thu Jan 19, 2017 1:21 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW 8.73 (Bond Enthalpies
- Replies: 5
- Views: 1306
Re: HW 8.73 (Bond Enthalpies
use the sum of bond enthalpies of all products minus the sum of bond enthalpies of all reactants.
and do not forget to multiply each bond with their moles
and do not forget to multiply each bond with their moles
- Fri Jan 13, 2017 12:41 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
IF A KING FARTS, WILL IT BE A NOBLE GAS?
- Fri Dec 02, 2016 1:11 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
H2O is water and H2O2 is hydrogen peroxide. What is H2O4?
Drinking.
Drinking.
- Wed Nov 23, 2016 10:09 am
- Forum: Conjugate Acids & Bases
- Topic: NH4+ and NH3
- Replies: 3
- Views: 15532
Re: NH4+ and NH3
In a neutralization reaction, an acid gives away one of its protons (ie H+ ion) to a base and forms its conjugate base, whereas the base accepts the proton and becomes its conjugate acid.
- Wed Nov 23, 2016 10:07 am
- Forum: Conjugate Acids & Bases
- Topic: Determining Weak or Strong Bases/Acids
- Replies: 4
- Views: 1358
Re: Determining Weak or Strong Bases/Acids
To determine whether an acid or a base is strong or weak, you need to know whether it ionizes completely.
Here's a list of strong acids and bases from http://www.austincc.edu/chemlab/strongacidbase
Here's a list of strong acids and bases from http://www.austincc.edu/chemlab/strongacidbase
- Thu Nov 17, 2016 1:40 pm
- Forum: Amphoteric Compounds
- Topic: How to tell something is amphoteric?
- Replies: 4
- Views: 2770
Re: How to tell something is amphoteric?
you can check if the compound can form H3O+ or OH- when it react with others.
If the compound can produce both when reacting with different reactants, it is amphoteric.
If the compound can produce both when reacting with different reactants, it is amphoteric.
- Thu Nov 17, 2016 1:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp
- Replies: 6
- Views: 3484
Re: Kp
Kp actually means K, which can be regarded equivalently to Kc.
Pure substances like solids and liquid are not included in the calculation of equilibrium constant, no matter if it's Kp or Kc.
Pure substances like solids and liquid are not included in the calculation of equilibrium constant, no matter if it's Kp or Kc.
- Tue Nov 15, 2016 12:46 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral complex and square-planar complex [ENDORSED]
- Replies: 1
- Views: 568
Tetrahedral complex and square-planar complex [ENDORSED]
how do you distinguish between tetrahedral complex and square-planar complex?
- Sat Nov 12, 2016 1:03 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
Did you know that oxygen went for a second date with potassium?
How did it go?
It went OK2!
How did it go?
It went OK2!
- Sat Nov 12, 2016 12:52 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Physical equilibrium and chemical equilibrium [ENDORSED]
- Replies: 1
- Views: 792
Physical equilibrium and chemical equilibrium [ENDORSED]
For Chem 14A, do we need to know about physical equilibrium?
Like the equilibrium between vapor and liquid in a closed container?
Like the equilibrium between vapor and liquid in a closed container?
- Sun Nov 06, 2016 11:11 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes
- Replies: 6
- Views: 1122
Re: Shapes
Yes, we do need to consider the lone pairs since the lone pairs repel other electrons and they can make the bond angle change. For example, if there are 2 molecules that both have 5 electron density regions, but 1 has only one lone pair in the central atom and another one has two, the molecular shap...
- Sun Nov 06, 2016 11:06 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Expanded Valence Shell Electrons
- Replies: 2
- Views: 874
Expanded Valence Shell Electrons
For those elements that can accommodate more than 8 electrons, is it neseccary that P has 10 valence electrons, S has 12 electrons and Cl has 14 electrons?? Can P has more than 10, like 12??
- Sat Oct 29, 2016 1:16 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
Q: What is the name of 007's Eskimo cousin?
A: Polar Bond.
A: Polar Bond.
- Sat Oct 29, 2016 1:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Do we need to know exact bond angles?
- Replies: 3
- Views: 883
Re: Do we need to know exact bond angles?
I don't think we need to know the exact values of bond angles. But we should be able to compare two bond angles when different molecular structures are given...
- Sun Oct 23, 2016 2:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3043340
Re: Post All Chemistry Jokes Here
Q: What do you call a clown who's in jail?
A: A silicon.
A: A silicon.
- Sun Oct 23, 2016 2:40 pm
- Forum: Sigma & Pi Bonds
- Topic: Quiz 2 Preparation [ENDORSED]
- Replies: 8
- Views: 3655
Re: Quiz 2 Preparation [ENDORSED]
I think we only need to review chapter 2 and 3 for Quiz 2 since the class announcement says the quiz will cover chapter2 and3. So we don't have to worry about the stuff of pi bond and sigma bond.