Search found 21 matches

by jillianduffield_2D
Thu Mar 16, 2017 4:03 pm
Forum: Balancing Redox Reactions
Topic: Balancing with OH- v. H+
Replies: 1
Views: 253

Balancing with OH- v. H+

For balancing redox reactions, is there a rule for when we use OH- instead of H+ and vice versa?
by jillianduffield_2D
Sun Mar 12, 2017 7:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Re: Post All Chemistry Jokes Here

Organic chemistry is hard. People who study it have alkynes of trouble.
by jillianduffield_2D
Sun Mar 12, 2017 7:33 pm
Forum: *Alcohols
Topic: more than one functional group [ENDORSED]
Replies: 2
Views: 353

more than one functional group [ENDORSED]

Should we know how to name compounds with more than one functional group? If yes, what is the order of priority for the different functional groups?
by jillianduffield_2D
Sun Feb 26, 2017 11:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Re: Post All Chemistry Jokes Here

In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race.
When the chemical kinetics specialist is asked why he ran slowly, his reply was “I always wanted to be the significant rate determining step”.
by jillianduffield_2D
Tue Feb 21, 2017 7:59 pm
Forum: First Order Reactions
Topic: 15.25
Replies: 1
Views: 252

15.25

In part C of the solution for this problem we are told to use ln([A]0/[A]t) = kt. Are there certain times when it is better to use this form of the equation over ln([A]t/[A]0) = -kt?
by jillianduffield_2D
Thu Feb 09, 2017 4:21 pm
Forum: Balancing Redox Reactions
Topic: 14.5 part A
Replies: 1
Views: 231

14.5 part A

Balance each equation of the following skeletal equations using oxidation and reduction half-reactions. All of the reactions take place in basic solution. Identify the oxidizing agent and reducing agent in each reaction. a) Action of ozone on bromide ions: My question is why did the H2O molecules no...
by jillianduffield_2D
Sun Jan 29, 2017 9:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.23
Replies: 1
Views: 260

9.23

Which would you expect to have a higher molecular entropy at T = 0, single crystals of BF3 or of COF2? Why?

I have read this section in the textbook and the answer in the workbook several times and I'm just not grasping the concept. Could someone help explain this to me?
by jillianduffield_2D
Tue Jan 24, 2017 8:55 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.87
Replies: 1
Views: 238

8.87

How much heat is required to convert a 42.30g block of ice at -5.042 degrees C into water vapor at 150.35 degrees C?
In this problem where is the equation used written either in the textbook or course reader?
by jillianduffield_2D
Fri Jan 20, 2017 6:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Re: Post All Chemistry Jokes Here

Exothermic reactions? I studied them before they were cool.
by jillianduffield_2D
Mon Jan 16, 2017 12:21 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Re: Post All Chemistry Jokes Here

What is the difference between thermodynamics and a stick?

A stick has two ends and no beginning. Thermodynamics has two ‘beginnings’ (the first and second law) and no end.
by jillianduffield_2D
Thu Dec 01, 2016 12:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Fall 2014 Final Exam Q5D.
Replies: 1
Views: 241

Fall 2014 Final Exam Q5D.

In part D of this question, the value of x is ignored in the reactants when calculating Kc. How do we know if we are supposed to include x or leave it out because the value is so small that it doesn't make a difference in the outcome?
by jillianduffield_2D
Thu Dec 01, 2016 10:19 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Final Review 2014 Q4C [ENDORSED]
Replies: 1
Views: 353

Final Review 2014 Q4C [ENDORSED]

Q4C. Dimercapto (2,3-dimercapto- 1-propanol) is an effective chelating agent for heavy metals such as arsenic, mercury, antimony, and gold. Draw one possible structure showing binding of one dimercaprol to Hg2+.
I see the answer on the page I am just very confused on how to get to the answer.
by jillianduffield_2D
Sun Nov 27, 2016 11:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.07a
Replies: 1
Views: 210

11.07a

7. The following flasks show the dissociation of a diatomic molecule, X sub 2, over time. (a) Which flask represents the point in time at which the reaction has reached equilibrium?
How do we look at the picture and know that it has reached equilibrium?
by jillianduffield_2D
Sun Nov 20, 2016 1:42 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Re: Post All Chemistry Jokes Here

Q: What is a cation afraid of?
A: A dogion.
by jillianduffield_2D
Mon Nov 07, 2016 8:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Chemistry Joke

Q: What do dipoles say in passing?
A: "Have you got a moment?"
by jillianduffield_2D
Sat Nov 05, 2016 2:01 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885236

Chem Joke

Q: What do you do with a sick chemist?
A. First you try to helium, then you try to curium, but if this fails then you have to barium.
by jillianduffield_2D
Tue Oct 25, 2016 10:45 pm
Forum: Student Social/Study Group
Topic: Delta Terrace Study Group
Replies: 3
Views: 639

Re: Delta Terrace Study Group

I want to join! Just let me know when and where
by jillianduffield_2D
Fri Oct 21, 2016 11:46 pm
Forum: Ionic & Covalent Bonds
Topic: HW 3.25 part a
Replies: 1
Views: 282

HW 3.25 part a

On the basis of the expected charges on the monatomic ions, give the chemical formula of each of the following compounds: a) magnesium arsenide
I don't understand how to get to the answer for this question
by jillianduffield_2D
Wed Oct 12, 2016 6:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.19 part b and c [ENDORSED]
Replies: 6
Views: 627

Question 2.19 part b and c [ENDORSED]

2.19
b) How many values of m sub l are allowed for an electron in a 6d-subshell?
c) How many values of m sub l are allowed for an electron in a 3p-subshell?
I am confused on how to get the answers to these questions
by jillianduffield_2D
Sat Oct 08, 2016 1:47 pm
Forum: DeBroglie Equation
Topic: 1.37 [ENDORSED]
Replies: 1
Views: 248

1.37 [ENDORSED]

1.37 Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 x 10^5 m/s in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. What does it mean to "repor...
by jillianduffield_2D
Wed Sep 28, 2016 5:03 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamental F. 3 Part B
Replies: 1
Views: 270

Fundamental F. 3 Part B

a) Write the formula for nitric acid. b) Without doing a calculation, estimate which element in nitric acid occurs with the greatest mass percentage.
How am I supposed to complete part b without doing a calculation?

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