Search found 49 matches
- Sun Mar 18, 2018 1:03 am
- Forum: Phase Changes & Related Calculations
- Topic: 8.23
- Replies: 5
- Views: 926
Re: 8.23
Unless it specifically states to use mass, you can assume to use moles or just go ahead and use mcdeltaT, m meaning for mass
- Sun Mar 18, 2018 1:00 am
- Forum: *Nucleophiles
- Topic: movement of electrons
- Replies: 3
- Views: 1399
Re: movement of electrons
You can either have the subsititution or addition reaction where one reactant is substituted for another compared to addition where one is broken off than the other is added once a certain reactant left
- Sun Mar 18, 2018 12:58 am
- Forum: Zero Order Reactions
- Topic: Half life
- Replies: 7
- Views: 1222
Re: Half life
Yeah, unless otherwise given in another form
- Sat Mar 17, 2018 11:53 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: why is the entropy change at constant pressure greater than the entropy change at constant volume?
- Replies: 3
- Views: 2281
Re: why is the entropy change at constant pressure greater than the entropy change at constant volume?
You also have to take into account that there are different Cp for the different states matter
- Sat Mar 17, 2018 11:51 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pseudo Rate Laws
- Replies: 5
- Views: 1101
Re: Pseudo Rate Laws
https://goldbook.iupac.org/html/P/P04933.html
This explains the meaning of a psuedo rate law, which ultimately is a concentration of one reactant thats greater than the other
This explains the meaning of a psuedo rate law, which ultimately is a concentration of one reactant thats greater than the other
- Sat Mar 17, 2018 5:34 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Problem
- Replies: 1
- Views: 357
Problem
Would there ever be a problem in which we have the forward reaction rate constant, equilibrium K, and have to solve for the reverse reaction?
- Sat Mar 17, 2018 5:28 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Doubling, quadrupling
- Replies: 1
- Views: 498
Doubling, quadrupling
What does it mean when you have a second order reaction and you double its rate or even triple, what would occur.
- Sat Mar 17, 2018 5:23 pm
- Forum: *Nucleophiles
- Topic: Electrostatic Attraction
- Replies: 1
- Views: 1187
Electrostatic Attraction
What does this term mean, and what would be the molecule or item that represents it?
- Sat Mar 17, 2018 5:21 pm
- Forum: Zero Order Reactions
- Topic: Shortcut
- Replies: 1
- Views: 382
Shortcut
What is a shortcut we can remember on finding out what the units for k would be.
- Sat Mar 17, 2018 5:19 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Practice Final 2010
- Replies: 1
- Views: 424
Practice Final 2010
Why would we use the ideal gas constant over the Cp or Cv if Volume is included?
- Sat Mar 17, 2018 12:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
Why did the white bear dissolve in water?
Because it was polar
Because it was polar
- Sat Mar 17, 2018 12:32 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
Lost an Electron,
You really have to keep an ion them
You really have to keep an ion them
- Sat Mar 17, 2018 12:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
Dubstep Titration: Drop the Base
- Sat Mar 17, 2018 12:24 pm
- Forum: Balancing Redox Reactions
- Topic: Eletro chem Test
- Replies: 4
- Views: 693
Eletro chem Test
How do you know how to solve for the reducing agent and oxizing agent for the reaction, O3/O2,OH and O3, H+/O2
- Thu Mar 15, 2018 7:57 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation
- Replies: 1
- Views: 308
Arrhenius Equation
If the Frequency factor is not given, however you are given two K's what equation would you use?
- Thu Mar 15, 2018 7:15 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
What do you call an Acid with attitude?
A mean-oh Acid
A mean-oh Acid
- Thu Mar 15, 2018 6:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
Laboratory Dogs
Laboratory Dogs
- Thu Mar 15, 2018 6:44 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
I don't trust atoms....
They make up everything
They make up everything
- Mon Mar 12, 2018 9:48 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.61
- Replies: 3
- Views: 638
Re: 15.61
You can review the tectbook also. Page 642, shows the different derivations of the arrhenius equation.
- Mon Mar 12, 2018 9:47 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.61
- Replies: 3
- Views: 638
Re: 15.61
The equation is represented as lnk2-lnk1=Ea/R(1/T2-1/T1).
K does infact equal k over k prime, however in this case we are using the arrhenius equation manipulated so that lnA is removed.
K does infact equal k over k prime, however in this case we are using the arrhenius equation manipulated so that lnA is removed.
- Mon Mar 12, 2018 9:41 pm
- Forum: Calculating Work of Expansion
- Topic: Different work problems?
- Replies: 2
- Views: 443
Different work problems?
When would we know when to use the different work equations such as -PDV or -nRTlnV2/V1 or DU. How would we be able to deduce one equation from a problem per se.
- Mon Mar 12, 2018 9:36 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Definition of Isothermal Reactions
- Replies: 2
- Views: 905
Re: Definition of Isothermal Reactions
Remember. Tfinal-Tinital, even though there are changes, ultimately you will go back down to the same temperature, so your response would become 0.
- Mon Mar 12, 2018 9:30 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Useful Table of Thermodynamic definitions!!
- Replies: 2
- Views: 635
Re: Useful Table of Thermodynamic definitions!!
I kind of had a similar outline, but it wasnt as neat and clean, But thank you! Great REview for the final.
- Mon Mar 12, 2018 9:23 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Hw 15.67
- Replies: 5
- Views: 1576
Hw 15.67
The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 125 kJmol1 to 75 kJmol1 . (a) By what factor does the rate of the reaction increase at 298 K, all other factors being equal? How would this problem be done? I know we would hav...
- Mon Mar 12, 2018 9:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
I'd tell you a chemistry joke, but all the good ones argon.
- Mon Mar 12, 2018 9:20 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2980749
Re: Post All Chemistry Jokes Here
What show do cesium and iodine love to watch together?
CsI
CsI
- Sun Jan 14, 2018 6:43 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Problem 8.3
- Replies: 1
- Views: 348
Re: Problem 8.3
Wait, nevermind I got it. I simply need to find volume using the area of circle and multiply by the distance. The convert to liters and plug it back into my equation.
- Sun Jan 14, 2018 6:32 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Problem 8.3
- Replies: 1
- Views: 348
Problem 8.3
Air in a bicycle pump is compressed by pushing in the handle. If the inner diameter of the pump is 3.0 cm and the pump is depressed 20. cm with a pressure of 2.00 atm, (a) how much work is done in the compression? What needs to be done in order to get the correct answer. I know that we need to use t...
- Sat Dec 09, 2017 10:27 pm
- Forum: *Particle in a Box
- Topic: Purpose
- Replies: 4
- Views: 1091
Purpose
What is the purpose of the particles in a box? The equation seems very confusing, but is it essential to understand the fundamentals of it for future references?
- Sat Dec 09, 2017 10:09 pm
- Forum: *Particle in a Box
- Topic: Purpose
- Replies: 1
- Views: 681
Purpose
What is the purpose of the particles in a box? The equation seems very confusing, but is it essential to understand the fundamentals of it for future references?
- Sat Dec 09, 2017 10:02 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 4
- Views: 763
Re: Bond Order
Is this actually important to know for the test or would it not be covered?
- Sat Dec 09, 2017 10:00 pm
- Forum: Hybridization
- Topic: how to determine hybridization
- Replies: 4
- Views: 681
Re: how to determine hybridization
Hybridization can be remembered like this.
sp has two bonds from the central atom, sp2 has 3 bonds, and sp3 has 4 bonds.
sp has two bonds from the central atom, sp2 has 3 bonds, and sp3 has 4 bonds.
- Sat Dec 09, 2017 9:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-shaped and Trigonal Pyramidal
- Replies: 6
- Views: 814
Re: T-shaped and Trigonal Pyramidal
Think about the steric number of the compound. So if it is an Sn of 5 then break it down to three bonds and 2 lone pairs making it a T- shape.
- Sat Dec 09, 2017 9:50 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Last Minute question
- Replies: 2
- Views: 351
Last Minute question
Buffer solutions will not be on the exam correct?
- Sat Dec 09, 2017 12:23 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: [H3O+] > 10-7
- Replies: 2
- Views: 743
Re: [H3O+] > 10-7
Another way of saying it is that -logpH=10^(-pH), so because you saw that the 10^ is (-7) it means that the pH is 7
- Sat Dec 09, 2017 12:20 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectroscopy Conceptually
- Replies: 3
- Views: 351
Re: Atomic Spectroscopy Conceptually
What about if your photon were to be absorbed at the highest energy at a ground state hydrogen? What would be the value of n?
- Sat Dec 09, 2017 12:15 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular shape song
- Replies: 1
- Views: 241
Molecular shape song
https://www.youtube.com/watch?v=P8d4WoXDLYM
This is a link that'll help with remembering the vsepr models! hope you guys enjoy, it definitely helps.
This is a link that'll help with remembering the vsepr models! hope you guys enjoy, it definitely helps.
- Fri Dec 08, 2017 7:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Test Fall 2017 [ENDORSED]
- Replies: 19
- Views: 3371
Re: Practice Test Fall 2017 [ENDORSED]
Hey!,
Can the solutions be posted for the final please! Thank you.
Can the solutions be posted for the final please! Thank you.
- Sun Dec 03, 2017 9:41 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.47
- Replies: 1
- Views: 353
11.47
For the reaction PCl5(g) Δ PCl3(g) Cl2(g), Kc 1.1 x10^-2 at 400. K. (a) Given that 1.0 g of PCl5 is placed in a 250.-mL
reaction vessel, determine the molar concentrations in the mixture at equilibrium.
How would you solve, I did convert, however answer doesn't appear to be correct.
reaction vessel, determine the molar concentrations in the mixture at equilibrium.
How would you solve, I did convert, however answer doesn't appear to be correct.
- Sun Dec 03, 2017 3:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Graphing
- Replies: 1
- Views: 180
Graphing
Is it possible to represent Q and K graphically? Such as products and reactants over time to show the change that they represent?
- Thu Nov 02, 2017 9:36 pm
- Forum: *Shrodinger Equation
- Topic: Equation Applications
- Replies: 1
- Views: 313
Re: Equation Applications
No we don't need to understand how to solve it. Much rather we simply need to understand what Shrodingers is and what it's application was. It's more conceptual than mathematical.
- Thu Nov 02, 2017 9:34 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3.4.b
- Replies: 1
- Views: 223
3.4.b
What is the electron configuration of Rh3+?
- Thu Oct 26, 2017 11:13 pm
- Forum: Trends in The Periodic Table
- Topic: 2.97
- Replies: 2
- Views: 487
2.97
Geiger counters can detect radioactivity because nuclear radiation consists of particles and radiation of suffi ciently high energy to knock electrons out of atoms. Consequently, this type of radiation is called “ionizing radiation.” What is the longest wavelength of radiation that can be detected b...
- Thu Oct 26, 2017 10:55 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1. 44
- Replies: 1
- Views: 344
1. 44
What is the minimum uncertainty in the position of a hydrogen atom in a particle accelerator given that its speed is known to within 5.0 ms1?
Would you take the weight of hydrogen atom from its atomic mass in kilograms?
Would you take the weight of hydrogen atom from its atomic mass in kilograms?
- Sat Oct 21, 2017 4:36 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2. 39 [ENDORSED]
- Replies: 5
- Views: 740
2. 39 [ENDORSED]
2.39 Determine whether each of the following electron confi gurations represents the ground state or an excited state of the atom given.
What are the explanations and how would you do this?
What are the explanations and how would you do this?
- Thu Oct 19, 2017 12:42 am
- Forum: Photoelectric Effect
- Topic: 1. 55 [ENDORSED]
- Replies: 1
- Views: 342
1. 55 [ENDORSED]
Infrared spectroscopy is an important tool for studying vibrations of molecules. Just as an atom can absorb a photon of suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to move from one vibrat...
- Thu Oct 19, 2017 12:40 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum number shortcuts [ENDORSED]
- Replies: 1
- Views: 953
Quantum number shortcuts [ENDORSED]
Are there any shortcuts that may be useful for remembering the quantum numbers? Something that may come in handy?
- Thu Oct 05, 2017 7:45 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G. 21
- Replies: 3
- Views: 555
G. 21
A solution is prepared by dissolving 0.500 g of KCl, 0.500 g of K2S, and 0.500 g of K3PO4 in 500. mL of water. What is the concentration in the fi nal solution of (a) potassium ions; (b) sulfi de ions?
- Tue Oct 03, 2017 11:23 pm
- Forum: Empirical & Molecular Formulas
- Topic: F. 9
- Replies: 2
- Views: 1653
F. 9
Vanillin is found in vanilla extracted from Mexican orchids. A report on the analysis of vanillin listed the mass percentage composition as 63.15% C, 5.30% H, and 31.55% O. In what atom ratios are the atoms present in vanillin?.