Search found 8 matches

Wed Dec 10, 2014 6:15 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and pOH
Replies: 3
Views: 428

Re: pH and pOH

How did you go from:
[HN]= 10^-3.26 to
5.495 times 10^-4
Where did you get the 5.495?
Thu Dec 04, 2014 7:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating partial pressure using a solid
Replies: 3
Views: 2470

Re: Calculating partial pressure using a solid

If one of the reactants is a solid, (i.e. the other is a gas), then would the partial pressure of the solid be 1?
Wed Dec 03, 2014 2:41 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and pOH
Replies: 3
Views: 428

Re: pH and pOH

a. Call the niacin HN Definition of Ka Ka = [H+]*[N-] / [HN] Let the [H+] = X. Because [H+] = [N-] , then [H+]*[N-] can be written: X² Because the dissociation of HN↔ H+ + N- is very small compared to the concentration of HN, we can ignore this and call [HN] = 0.02M Substituting: Ka = X²/0.02 From p...
Wed Dec 03, 2014 2:29 pm
Forum: Naming
Topic: Keypoints for Naming Compounds
Replies: 2
Views: 415

Re: Keypoints for Naming Compounds

You could add when you would add "ion" to the end of the name.
Wed Dec 03, 2014 2:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: What is "dien"?
Replies: 1
Views: 3315

Re: What is "dien"?

"Dien" is a short-hand way of writing the name for the ligand diethylenetriamine (which has the same name under the new IUPAC conventions).
The formula is:
NH2CH2CH2NHCH2CH2NH2.
You can also find this on page 101 in the Course Reader.
Mon Nov 10, 2014 9:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8042
Views: 1412051

Re: Chemistry Jokes

At the end of the semester, a chemistry teacher asked her students what was the most important thing that they learned in lab. A student promptly raised his hand and said, "Never lick the spoon." Q: Why does hamburger yield lower energy than steak? A: Because it's in the ground state. Heis...
Mon Oct 27, 2014 1:30 pm
Forum: Trends in The Periodic Table
Topic: Why is Palladium's electron configuration different?
Replies: 1
Views: 24787

Re: Why is Palladium's electron configuration different?

Not a typo. We know that Pd has 46 electrons by looking at the periodic table, and we know that "s" orbitals can have a maximum of 2 electrons, "p" can have 6, "d" can have 10, and "f" can have 14. So the full electron configuration for Palladium would start w...
Fri Oct 10, 2014 10:28 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Minimum Uncertainty (Heisenberg)
Replies: 1
Views: 376

Minimum Uncertainty (Heisenberg)

(From homework question 1.29)
What is the minimum uncertainty in speed of an electron in a Pb atom which has diameter equal to 350 pm?

My question:
What would you do differently if it asked for "maximum" uncertainty? Or would that not need to be calculated?
Thank you.