Search found 15 matches

by Chelsey_Schaum1H
Sat Mar 18, 2017 5:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Functional Group
Replies: 1
Views: 266

Re: Functional Group

Halides, alcohols, ethers, ketones, carboxylic acids, aldehydes, and amines.
by Chelsey_Schaum1H
Sun Mar 12, 2017 9:11 pm
Forum: *Cycloalkenes
Topic: Multiple double or triple bonds
Replies: 2
Views: 633

Multiple double or triple bonds

If a cycloalkene or alkyne or a normal Alkene or alkyne has multiple double or triple bonds, in the naming do you put a prefix indicating how many double or triple bonds there are? Such as 1,4- dialkene, or just 1,4- alkene?
by Chelsey_Schaum1H
Mon Mar 06, 2017 10:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst [ENDORSED]
Replies: 2
Views: 336

Catalyst [ENDORSED]

Is the catalyst written in the rate of reaction equation?
by Chelsey_Schaum1H
Wed Feb 22, 2017 12:32 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy
Replies: 1
Views: 318


How is there a change in enthalpy when q= 0 and there is no temperature change?
by Chelsey_Schaum1H
Sun Feb 05, 2017 8:34 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1215146

Re: Post All Chemistry Jokes Here

Q: When one physicist asks another, "What's new?" what's the typical response?
A:C over lambda.
by Chelsey_Schaum1H
Sun Jan 29, 2017 3:51 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1215146

Re: Post All Chemistry Jokes Here

Q: What was the charge when NaCl got arrested?
A: A salt
by Chelsey_Schaum1H
Fri Jan 13, 2017 2:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hw question 8.57
Replies: 3
Views: 344

Hw question 8.57

Is it possible to use standard enthalpies of formation instead of Hess' Law? I did standard enthaplies of formation and got 312. The answer is -312, I can't figure out where the negative comes from.
by Chelsey_Schaum1H
Sat Dec 03, 2016 4:26 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Using mmols
Replies: 1
Views: 686

Re: Using mmols

I think you can use mmol in an ice chart as long as the volume is in ml. At the end when you convert to molarity and divide the mmol by ml the mili will cancel out and you'll be left with just mol/L which is molarity.
by Chelsey_Schaum1H
Thu Nov 24, 2016 12:22 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Difference between KA and PKA
Replies: 4
Views: 1050

Re: Difference between KA and PKA

I think of the pKa like the pH of the acidic constant.
Like in pH=-log[H30+] is the pH of H30+,
PKa= -log[ Ka] is the pH of the Ka constant kind of.
The pKa can be used to test the strength of the acid. The lower the pKa is, the stronger the acid will be and vise versa.
by Chelsey_Schaum1H
Fri Nov 11, 2016 1:04 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbitals of Different Metals
Replies: 1
Views: 252

Molecular Orbitals of Different Metals

On the hw question 57 it asks you to draw the molecular orbital diagram for NO+ then asks will the electrons have a higher probability of being at N or O and why? I understand how to draw the diagram but not sure about the second part of the question
by Chelsey_Schaum1H
Sat Nov 05, 2016 6:26 pm
Forum: Hybridization
Topic: Which Hybrid Orbital
Replies: 6
Views: 694

Which Hybrid Orbital

Hey can someone tell me how you know which hybrid orbital to use? I know linear you use sp and trigonal planar sp2 etc. but why do you use these?
by Chelsey_Schaum1H
Sat Oct 29, 2016 8:45 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Antibonding Orbitals
Replies: 1
Views: 292

Antibonding Orbitals

Hey, can someone please explain what an antibonding orbital is? And how do you know if the molecule has any antibonding orbitals?
by Chelsey_Schaum1H
Thu Oct 20, 2016 9:56 pm
Forum: Ionic & Covalent Bonds
Topic: formal charge [ENDORSED]
Replies: 4
Views: 1016

Re: formal charge [ENDORSED]

A formal charge is just the charge on each specific atom in the molecule, the formal charges of the atoms should add up to the charge of the whole molecule. The purpose of the formal charges is to see the stability of the structures I think. The structure is more favored and stable if the central at...
by Chelsey_Schaum1H
Fri Oct 14, 2016 12:55 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Homework Problem 1.43
Replies: 1
Views: 364

Re: Homework Problem 1.43

Hey! So this question is regarding the Heisenberg uncertainty principle which is (Delta x)(delta p)= h/4pi You are given the uncertainty in position (delta x) as 350 pm. You are asked to find the uncertainty in speed, or velocity, but first you have to find the uncertainty in momentum (delta p). Fir...
by Chelsey_Schaum1H
Wed Oct 05, 2016 4:17 pm
Forum: Properties of Light
Topic: 1.69 Homework Problem [ENDORSED]
Replies: 2
Views: 570

Re: 1.69 Homework Problem [ENDORSED]

Hey! So the work is given in the problem. The work is equivalent to the threshold energy. First, you need to convert the work from ev to joules Second, convert each wavelength of light given (the red and violet) into energy using E=hc/(wavelength) Third, compare the energies you calculated to the th...

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