Search found 49 matches

by Juanalv326
Sun Mar 18, 2018 1:03 am
Forum: Phase Changes & Related Calculations
Topic: 8.23
Replies: 5
Views: 379

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
by Juanalv326
Sun Mar 18, 2018 1:00 am
Forum: *Nucleophiles
Topic: movement of electrons
Replies: 2
Views: 496

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
by Juanalv326
Sun Mar 18, 2018 12:58 am
Forum: Zero Order Reactions
Topic: Half life
Replies: 7
Views: 578

Re: Half life

Yeah, unless otherwise given in another form
by Juanalv326
Sat Mar 17, 2018 11:51 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pseudo Rate Laws
Replies: 5
Views: 503

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
by Juanalv326
Sat Mar 17, 2018 5:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Problem
Replies: 1
Views: 104

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?
by Juanalv326
Sat Mar 17, 2018 5:28 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Doubling, quadrupling
Replies: 1
Views: 178

Doubling, quadrupling

What does it mean when you have a second order reaction and you double its rate or even triple, what would occur.
by Juanalv326
Sat Mar 17, 2018 5:23 pm
Forum: *Nucleophiles
Topic: Electrostatic Attraction
Replies: 1
Views: 397

Electrostatic Attraction

What does this term mean, and what would be the molecule or item that represents it?
by Juanalv326
Sat Mar 17, 2018 5:21 pm
Forum: Zero Order Reactions
Topic: Shortcut
Replies: 1
Views: 165

Shortcut

What is a shortcut we can remember on finding out what the units for k would be.
by Juanalv326
Sat Mar 17, 2018 5:19 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Practice Final 2010
Replies: 1
Views: 225

Practice Final 2010

Why would we use the ideal gas constant over the Cp or Cv if Volume is included?
by Juanalv326
Sat Mar 17, 2018 12:33 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

Why did the white bear dissolve in water?

Because it was polar
by Juanalv326
Sat Mar 17, 2018 12:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

Lost an Electron,
You really have to keep an ion them
by Juanalv326
Sat Mar 17, 2018 12:30 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

Dubstep Titration: Drop the Base
by Juanalv326
Sat Mar 17, 2018 12:24 pm
Forum: Balancing Redox Reactions
Topic: Eletro chem Test
Replies: 4
Views: 258

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
by Juanalv326
Thu Mar 15, 2018 7:57 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 1
Views: 117

Arrhenius Equation

If the Frequency factor is not given, however you are given two K's what equation would you use?
by Juanalv326
Thu Mar 15, 2018 7:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

What do you call an Acid with attitude?

A mean-oh Acid
by Juanalv326
Thu Mar 15, 2018 6:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

What kind of dogs do chemists have?

Laboratory Dogs
by Juanalv326
Thu Mar 15, 2018 6:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

I don't trust atoms....
They make up everything
by Juanalv326
Mon Mar 12, 2018 9:48 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.61
Replies: 3
Views: 201

Re: 15.61

You can review the tectbook also. Page 642, shows the different derivations of the arrhenius equation.
by Juanalv326
Mon Mar 12, 2018 9:47 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.61
Replies: 3
Views: 201

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.
by Juanalv326
Mon Mar 12, 2018 9:41 pm
Forum: Calculating Work of Expansion
Topic: Different work problems?
Replies: 2
Views: 236

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.
by Juanalv326
Mon Mar 12, 2018 9:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Definition of Isothermal Reactions
Replies: 2
Views: 523

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.
by Juanalv326
Mon Mar 12, 2018 9:30 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Useful Table of Thermodynamic definitions!!
Replies: 2
Views: 293

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.
by Juanalv326
Mon Mar 12, 2018 9:23 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Hw 15.67
Replies: 5
Views: 324

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...
by Juanalv326
Mon Mar 12, 2018 9:21 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

I'd tell you a chemistry joke, but all the good ones argon.
by Juanalv326
Mon Mar 12, 2018 9:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017639

Re: Post All Chemistry Jokes Here

What show do cesium and iodine love to watch together?

CsI
by Juanalv326
Sun Jan 14, 2018 6:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Problem 8.3
Replies: 1
Views: 108

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.
by Juanalv326
Sun Jan 14, 2018 6:32 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Problem 8.3
Replies: 1
Views: 108

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...
by Juanalv326
Sat Dec 09, 2017 10:27 pm
Forum: *Particle in a Box
Topic: Purpose
Replies: 2
Views: 417

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?
by Juanalv326
Sat Dec 09, 2017 10:09 pm
Forum: *Particle in a Box
Topic: Purpose
Replies: 1
Views: 412

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?
by Juanalv326
Sat Dec 09, 2017 10:02 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order
Replies: 4
Views: 386

Re: Bond Order

Is this actually important to know for the test or would it not be covered?
by Juanalv326
Sat Dec 09, 2017 10:00 pm
Forum: Hybridization
Topic: how to determine hybridization
Replies: 4
Views: 248

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.
by Juanalv326
Sat Dec 09, 2017 9:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shaped and Trigonal Pyramidal
Replies: 6
Views: 365

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.
by Juanalv326
Sat Dec 09, 2017 9:50 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Last Minute question
Replies: 2
Views: 181

Last Minute question

Buffer solutions will not be on the exam correct?
by Juanalv326
Sat Dec 09, 2017 12:23 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: [H3O+] > 10-7
Replies: 2
Views: 143

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
by Juanalv326
Sat Dec 09, 2017 12:20 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectroscopy Conceptually
Replies: 3
Views: 227

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?
by Juanalv326
Sat Dec 09, 2017 12:15 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shape song
Replies: 1
Views: 150

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.
by Juanalv326
Fri Dec 08, 2017 7:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Practice Test Fall 2017 [ENDORSED]
Replies: 19
Views: 2075

Re: Practice Test Fall 2017 [ENDORSED]

Hey!,

Can the solutions be posted for the final please! Thank you.
by Juanalv326
Sun Dec 03, 2017 9:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.47
Replies: 1
Views: 155

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.
by Juanalv326
Sun Dec 03, 2017 3:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Graphing
Replies: 1
Views: 121

Graphing

Is it possible to represent Q and K graphically? Such as products and reactants over time to show the change that they represent?
by Juanalv326
Thu Nov 02, 2017 9:36 pm
Forum: *Shrodinger Equation
Topic: Equation Applications
Replies: 1
Views: 211

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.
by Juanalv326
Thu Nov 02, 2017 9:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3.4.b
Replies: 1
Views: 97

3.4.b

What is the electron configuration of Rh3+?
by Juanalv326
Thu Oct 26, 2017 11:13 pm
Forum: Trends in The Periodic Table
Topic: 2.97
Replies: 2
Views: 268

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...
by Juanalv326
Thu Oct 26, 2017 10:55 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1. 44
Replies: 1
Views: 156

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?
by Juanalv326
Sat Oct 21, 2017 4:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2. 39 [ENDORSED]
Replies: 5
Views: 304

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?
by Juanalv326
Thu Oct 19, 2017 12:42 am
Forum: Photoelectric Effect
Topic: 1. 55 [ENDORSED]
Replies: 1
Views: 133

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...
by Juanalv326
Thu Oct 19, 2017 12:40 am
Forum: Quantum Numbers and The H-Atom
Topic: Quantum number shortcuts [ENDORSED]
Replies: 1
Views: 250

Quantum number shortcuts [ENDORSED]

Are there any shortcuts that may be useful for remembering the quantum numbers? Something that may come in handy?
by Juanalv326
Thu Oct 05, 2017 7:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: G. 21
Replies: 3
Views: 331

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?
by Juanalv326
Tue Oct 03, 2017 11:23 pm
Forum: Empirical & Molecular Formulas
Topic: F. 9
Replies: 2
Views: 534

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?.

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