Search found 22 matches

by Amanda Salgado 3D
Thu Mar 16, 2017 5:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 101118

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, Thank you so much for all that you have done these past two quarters in chemistry. You have been such a wonderful and resourceful professor and I have learned so much being in your class. It has been such a great two quarters knowing that I had a professor that genuinely cared about stu...
by Amanda Salgado 3D
Thu Mar 09, 2017 9:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017388

Re: Post All Chemistry Jokes Here

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO
by Amanda Salgado 3D
Thu Mar 02, 2017 5:45 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Nucleophile & Electrophile
Replies: 1
Views: 191

Nucleophile & Electrophile

Why is CH3Cl considered an electrophile (electron deficient) when chlorine has six electrons around it?
by Amanda Salgado 3D
Thu Feb 23, 2017 6:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017388

Re: Post All Chemistry Jokes Here

What is the chemical formula for banana?




BaNa2
by Amanda Salgado 3D
Sun Feb 19, 2017 9:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017388

Re: Post All Chemistry Jokes Here

Are all my jokes too basic for you? Why is there no reaction?
by Amanda Salgado 3D
Tue Feb 07, 2017 10:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Winter 2015 Midterm question 2and 3c
Replies: 2
Views: 403

Winter 2015 Midterm question 2and 3c

The question asks you to calculate the standard enthalpy of formation for HI(g). I calculated the standard enthalpy without HI and got 15.52, I then subtracted it from 84 KJ/mol, but the correct way was to subtract it from 42 KJ/mol. Why is it subtracted from 42 and not 84 KJ/mol?
by Amanda Salgado 3D
Thu Feb 02, 2017 9:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017388

Re: Post All Chemistry Jokes Here

I have many good chemistry jokes....




I'm just afraid they won't get a good reaction.
by Amanda Salgado 3D
Thu Jan 26, 2017 5:29 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible vs. Irreversible
Replies: 1
Views: 184

Reversible vs. Irreversible

What are the differences in characteristics of a reversible system versus a irreversible system? Which one is more efficient?
by Amanda Salgado 3D
Thu Jan 19, 2017 9:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017388

Re: Post All Chemistry Jokes Here

I don't trust atoms.....



I heard they make up everything.
by Amanda Salgado 3D
Sat Jan 14, 2017 12:54 pm
Forum: Phase Changes & Related Calculations
Topic: phase changes [ENDORSED]
Replies: 3
Views: 459

phase changes [ENDORSED]

Just to clarify, when going from up from a solid, to liquid, to gas...the result is a positive number, and when going down from a gas, to a liquid, to a solid, the result is a negative number?
by Amanda Salgado 3D
Thu Dec 01, 2016 8:59 pm
Forum: Bronsted Acids & Bases
Topic: Ka and Kb
Replies: 1
Views: 294

Ka and Kb

When a Ka and Kb are given, is it safe to always assume away the x when calculating it in the equation because they are a weak acid/weak base?
by Amanda Salgado 3D
Sun Nov 27, 2016 4:22 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acidity and atomic radius
Replies: 1
Views: 523

Acidity and atomic radius

Why is it that as the atomic radius increases, the acidity increases?
by Amanda Salgado 3D
Sun Nov 27, 2016 4:17 pm
Forum: Bronsted Acids & Bases
Topic: Strong and Weak Acids
Replies: 1
Views: 290

Strong and Weak Acids

Are weak acids still considered to be in equilibrium even with the favoring of the products?
by Amanda Salgado 3D
Thu Nov 17, 2016 8:46 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO Diagram/ Bond Order (C2)^2-
Replies: 1
Views: 1189

Re: MO Diagram/ Bond Order (C2)^2-

The molecular diagram you would use is the Z<8 one because carbon's atomic number is 6, however when filling in the valence electrons you would use 10 because it is two carbons(C2) (4+4) with a negative 2 charge so (+2 valence electrons). The bond order of this would be calculated using the middle p...
by Amanda Salgado 3D
Thu Nov 10, 2016 6:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium constant
Replies: 1
Views: 206

Chemical Equilibrium constant

Kc is an equilibrium constant and therefore cannot be changed. Even if the concentration is changed, the constant stays the same, however, if the temperature is changed, does the equilibrium constant change in this case?
by Amanda Salgado 3D
Thu Nov 03, 2016 5:52 pm
Forum: Lewis Structures
Topic: Octet rule
Replies: 7
Views: 546

Re: Octet rule

Also, the central atom can only have an expanded octet if it's phosphorous and anything beyond on the periodic table because they are reaching the d-orbitals. In addition, it is also important to note that carbon always needs a full octet.
by Amanda Salgado 3D
Thu Oct 27, 2016 8:51 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds vs Covalent [ENDORSED]
Replies: 1
Views: 271

Re: Sigma and Pi bonds vs Covalent [ENDORSED]

Yes, sigma and pi bonds are both a form of covalent bond. A sigma bond is formed when two orbitals overlap(interact) end-to-end, and pi bonds are formed when two orbitals overlap side by side.
by Amanda Salgado 3D
Thu Oct 20, 2016 9:25 pm
Forum: Lewis Structures
Topic: Chapter 3 Question 21 [ENDORSED]
Replies: 2
Views: 316

Re: Chapter 3 Question 21 [ENDORSED]

Yes that clears things up,thank you!
by Amanda Salgado 3D
Thu Oct 20, 2016 6:44 pm
Forum: Lewis Structures
Topic: Chapter 3 Question 21 [ENDORSED]
Replies: 2
Views: 316

Chapter 3 Question 21 [ENDORSED]

The question asks you write out the abbreviated electron configuration of Te^-2, the solutions manual states that the answer is [Xe], however is the answer still valid as [Kr] 5s^2 4d^10 5p^6 (with no unpaired electrons)?
by Amanda Salgado 3D
Thu Oct 13, 2016 6:11 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical equations too slow... any advice? [ENDORSED]
Replies: 18
Views: 1540

Re: Balancing Chemical equations too slow... any advice? [ENDORSED]

In addition, when balancing and there is an odd number of either product or reactant, try doubling (multiplying everything by 2) to make it an even number, and balance the rest of the equation from there, hopefully creating the same amount of reactants to products.
by Amanda Salgado 3D
Thu Oct 06, 2016 8:35 pm
Forum: Properties of Electrons
Topic: Delta E Question from the delta E= Efinal-Eintial equation [ENDORSED]
Replies: 1
Views: 780

Delta E Question from the delta E= Efinal-Eintial equation [ENDORSED]

When a problem states that the electron is absorbing light, then delta E will be a positive value, and when it states that it is emitting light, delta E will be a negative value?
by Amanda Salgado 3D
Thu Sep 29, 2016 7:15 pm
Forum: Properties of Light
Topic: Chapter 1 homework question
Replies: 1
Views: 282

Chapter 1 homework question

Chapter 1 question 9 gives a chart with different values varying from frequency, wavelength, and energy of photons. Parts of the chart are blank and more specifically in the 4th row, 2.5nm is given as the wavelength. I have already figured out the frequency which is 1.2 x 10^-17 Hz and in order to f...

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