## Search found 49 matches

Sun Mar 18, 2018 1:03 am
Forum: Phase Changes & Related Calculations
Topic: 8.23
Replies: 5
Views: 492

### 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: 2
Views: 686

### 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: 779

### 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: 562

### 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: 713

### 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
Sat Mar 17, 2018 5:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Problem
Replies: 1
Views: 178

### 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
Replies: 1
Views: 270

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: 548

### 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: 228

### 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: 273

### 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: 8245
Views: 1438563

### Re: Post All Chemistry Jokes Here

Why did the white bear dissolve in water?

Because it was polar
Sat Mar 17, 2018 12:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1438563

### Re: Post All Chemistry Jokes Here

Lost an Electron,
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: 8245
Views: 1438563

### 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: 347

### 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: 152

### 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: 8245
Views: 1438563

### Re: Post All Chemistry Jokes Here

What do you call an Acid with attitude?

A mean-oh Acid
Thu Mar 15, 2018 6:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1438563

### Re: Post All Chemistry Jokes Here

What kind of dogs do chemists have?

Laboratory Dogs
Thu Mar 15, 2018 6:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1438563

### Re: Post All Chemistry Jokes Here

I don't trust atoms....
They make up everything
Mon Mar 12, 2018 9:48 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.61
Replies: 3
Views: 331

### 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: 331

### 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.
Mon Mar 12, 2018 9:41 pm
Forum: Calculating Work of Expansion
Topic: Different work problems?
Replies: 2
Views: 274

### 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: 601

### 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: 398

### 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: 1081

### 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: 8245
Views: 1438563

### 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: 8245
Views: 1438563

### Re: Post All Chemistry Jokes Here

What show do cesium and iodine love to watch together?

CsI
Sun Jan 14, 2018 6:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Problem 8.3
Replies: 1
Views: 192

### 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: 192

### 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: 3
Views: 584

### 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: 537

### 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: 528

### 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: 398

### 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.
Sat Dec 09, 2017 9:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shaped and Trigonal Pyramidal
Replies: 6
Views: 478

### 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: 256

### 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: 249

### 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: 274

### 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: 183

### Molecular shape song

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: 2623

### Re: Practice Test Fall 2017[ENDORSED]

Hey!,

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: 240

### 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.
Sun Dec 03, 2017 3:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Graphing
Replies: 1
Views: 139

### 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: 243

### 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: 122

### 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: 327

### 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: 218

### 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 ms1?

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: 417

### 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?
Thu Oct 19, 2017 12:42 am
Forum: Photoelectric Effect
Topic: 1. 55 [ENDORSED]
Replies: 1
Views: 194

### 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: 457

### 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: 384

### 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: 986

### 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?.