Search found 15 matches

by Dan_Jin_1K
Sat Dec 03, 2016 10:07 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Question 12.27
Replies: 1
Views: 283

Question 12.27

Hey everyone! Can someone offer me an explanation on how to do this problem? A careless laboratory technician wants to prepare 200.0 mL of a 0.025 m HCl(aq) solution, but uses a 250.0-mL volumetric ask by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual p...
by Dan_Jin_1K
Mon Nov 28, 2016 10:18 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018849

Re: Post All Chemistry Jokes Here

What did two brothers Grant and Michael do for thanksgiving? Well, first, they woke up at 10am to watch the wonderful Macy's Thanksgiving Parade. After that, their cousins came over, and they hung out, playing xbox, basketball, and watching some NFL football. When the clock stroke 5PM, dinner was re...
by Dan_Jin_1K
Fri Nov 25, 2016 11:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018849

Re: Post All Chemistry Jokes Here

What did Carbon San Diego, Barium Bonds, and Selenium Gomez go for Thanksgiving?

Silicon Valley!
by Dan_Jin_1K
Mon Nov 21, 2016 10:09 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018849

Re: Post All Chemistry Jokes Here

How many Heisenbergs does it take to change a light bulb?

Well, if you know the number, you don't know where the light bulb is!!!
by Dan_Jin_1K
Wed Nov 16, 2016 9:18 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018849

Re: Post All Chemistry Jokes Here

What is a cation afraid?

A dogion!

hahahahah!
by Dan_Jin_1K
Mon Nov 07, 2016 7:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018849

Re: Post All Chemistry Jokes Here

What do you call an acid with an attitude?

An a-mean-o acid!!!

hahahahahahhaha
by Dan_Jin_1K
Tue Nov 01, 2016 11:15 pm
Forum: Photoelectric Effect
Topic: 2015 Midterm Question #3
Replies: 2
Views: 567

2015 Midterm Question #3

Hello all, Question 3A on midterm 2015 reads "The velocity of an electron emitted from a metallic surface by a photon is 3.6 x 10^3 km/s. What is the wavelength of the ejected electron?" How can one deduce from this question's wording that we should use De Broglie's equation instead of usi...
by Dan_Jin_1K
Sat Oct 29, 2016 5:54 pm
Forum: Quantum Numbers and The H-Atom
Topic: 2006 Practice Midterm Question #5C
Replies: 1
Views: 303

2006 Practice Midterm Question #5C

Hey guys!

On question 5C, it asks "What is the subshell notation and the number of orbitals having the quantum numbers n=3, l=2?"

I understand that the subshell notation is 3d, but how do I figure out how many orbitals have the quantum numbers of n=3 and l=2?

Thank you!!
by Dan_Jin_1K
Thu Oct 27, 2016 12:44 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations Stability
Replies: 1
Views: 218

Electron Configurations Stability

For our periodic tables, why are some elements' electron configurations, for example, Cr: 3d5 4s1 written instead of Cr4 4s2? Other examples Nb: 4d4 5s1 instead of 4d3 5s2 Pt: 4f14 5d9 6s1 instead of 4f14 5d8 6s2 I understand that Pd removes the two electrons from the 5s orbital to fill up the 4d or...
by Dan_Jin_1K
Mon Oct 24, 2016 8:47 pm
Forum: Ionic & Covalent Bonds
Topic: Chapter 3 Homework #13
Replies: 2
Views: 604

Chapter 3 Homework #13

Hi everyone!

Could someone explain to me how to find the answers for this question?

For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will need to be removed to form the 1 ions: (a) Zn; (b) Cl; (c) Al; (d) Cu.

Thank you!
by Dan_Jin_1K
Thu Oct 20, 2016 3:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018849

Re: Post All Chemistry Jokes Here

So two friends walk into a bar, and one friend says "I'll have an H2O." The other friend says "I'll have an H2O too".

Both friends drink their beverages and the second one dies unfortunately, because the second friend asked for H2O2, which is hydrogen peroxide :(
by Dan_Jin_1K
Mon Oct 10, 2016 3:20 pm
Forum: Properties of Light
Topic: Rydberg Equation
Replies: 5
Views: 615

Rydberg Equation

Hey guys, I'm a little confused on when we should be using the Rydberg Equation that the textbook provided (V = R (1/n1^2) -(1/n2^2)) vs the one that we learned about in lecture (E= -hR/n^2).

Can someone explain to me which one we should use and why?

Thank you!
by Dan_Jin_1K
Mon Oct 10, 2016 3:10 pm
Forum: Properties of Light
Topic: HW Question Ch #27 [ENDORSED]
Replies: 5
Views: 916

Re: HW Question Ch #27 [ENDORSED]

To Sylvia, One mole is 6.022 x 10^23 of "things". The mole can be 6.022 x 10^23 atoms, which can be said as 1 mol of atoms, or it could be 6.022 x 10^23 donuts, which would be said as 1 mol of donuts. For this case, 1 mol of photons, just means 6.022 x 10^23 of those "things" (ph...
by Dan_Jin_1K
Thu Oct 06, 2016 2:07 am
Forum: Properties of Light
Topic: Homework Problem 1.23 [ENDORSED]
Replies: 2
Views: 345

Homework Problem 1.23 [ENDORSED]

Can anybody walk me through how I can answer this question?

I'm confused as to where I should start.

The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these y-rays.
by Dan_Jin_1K
Tue Sep 27, 2016 7:18 pm
Forum: Balancing Chemical Reactions
Topic: How familiar should we be with Naming compounds? [ENDORSED]
Replies: 8
Views: 1232

Re: How familiar should we be with Naming compounds? [ENDORSED]

Is there some special method that we can learn so that we can figure out how to write compounds based on the positivity/negativty of each element? For instance, for Magnesium Sulfate Heptahydrate, how can one figure out which elements are positive and which are negative, and the charges of the eleme...

Go to advanced search