CHEMISTRY COMMUNITY

Ann Zhang_1M

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...

Ann Zhang_1M

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!

Ann Zhang_1M

When we are writing the formulas for nucleophile and electrophile reactions, do we need to use arrows to indicate the movement of electrons?

Ann Zhang_1M

Why do chemists like nitrates so much?
They're cheaper than day rates

Ann Zhang_1M

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.

Ann Zhang_1M

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.

Ann Zhang_1M

how many questions are included in quiz2?

Ann Zhang_1M

Don't trust atoms, they make up everything.

Ann Zhang_1M

It depends on the substances that are involved in the reaction(number of bonds, bond enthalpies, etc.) or phase change.

Ann Zhang_1M

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

Ann Zhang_1M

IF A KING FARTS, WILL IT BE A NOBLE GAS?

Ann Zhang_1M

H2O is water and H2O2 is hydrogen peroxide. What is H2O4?
Drinking.

Ann Zhang_1M

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.

Ann Zhang_1M

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

Ann Zhang_1M

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.

Ann Zhang_1M

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.

Ann Zhang_1M

how do you distinguish between tetrahedral complex and square-planar complex?

Ann Zhang_1M

Did you know that oxygen went for a second date with potassium?
How did it go?
It went OK2!

Ann Zhang_1M

For Chem 14A, do we need to know about physical equilibrium?
Like the equilibrium between vapor and liquid in a closed container?

Ann Zhang_1M

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...

Ann Zhang_1M

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??

Ann Zhang_1M

Q: What is the name of 007's Eskimo cousin?
A: Polar Bond.

Ann Zhang_1M

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...

Ann Zhang_1M

Q: What do you call a clown who's in jail?
A: A silicon.

Ann Zhang_1M

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.

CHEMISTRY COMMUNITY

Search found 25 matches

Carbon Number

Re: Post All Chemistry Jokes Here

nucleophile and electrophile reactions

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Cell potential

Re: Post All Chemistry Jokes Here

Re: Quiz 2 Winter 2017

Re: Post All Chemistry Jokes Here

Re: Random question

Re: HW 8.73 (Bond Enthalpies

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: NH4+ and NH3

Re: Determining Weak or Strong Bases/Acids

Re: How to tell something is amphoteric?

Re: Kp

Tetrahedral complex and square-planar complex [ENDORSED]

Re: Post All Chemistry Jokes Here

Physical equilibrium and chemical equilibrium [ENDORSED]

Re: Shapes

Expanded Valence Shell Electrons

Re: Post All Chemistry Jokes Here

Re: Do we need to know exact bond angles?

Re: Post All Chemistry Jokes Here

Re: Quiz 2 Preparation [ENDORSED]