Search found 53 matches

by Adam Enomoto 1L
Mon Mar 12, 2018 8:27 pm
Forum: General Rate Laws
Topic: Decomposition of Ozone
Replies: 1
Views: 60

Re: Decomposition of Ozone

https://www.quora.com/What-is-the-order ... n-of-ozone
This explains the rate law for ozone
by Adam Enomoto 1L
Sat Mar 10, 2018 10:49 am
Forum: First Order Reactions
Topic: Units of Reactions. [ENDORSED]
Replies: 5
Views: 442

Re: Units of Reactions. [ENDORSED]

What helps most is just knowing that rate must be defined as mol/L*S so whatever reactants you have and what they multiply out to, just convert K to make sure the final units are in mol/L*S
by Adam Enomoto 1L
Sat Mar 10, 2018 10:47 am
Forum: General Rate Laws
Topic: Fractional Rate Law [ENDORSED]
Replies: 4
Views: 208

Re: Fractional Rate Law [ENDORSED]

https://chemistry.stackexchange.com/questions/49088/what-does-a-fractional-order-of-reaction-mean-for-the-mechanism This website might help with it. On page 621 the textbook talks about fractional order reactions. I'm not entirely sure, but if the fractional order is in the denominator, it means tha...
by Adam Enomoto 1L
Wed Mar 07, 2018 12:47 pm
Forum: First Order Reactions
Topic: Question 15.23
Replies: 3
Views: 171

Question 15.23

How do you solve for c? The question is determine the rate constant for each of the following 1st-order reactions, in each case expressed for the rate of loss
(c)2A-->B + C,given that[A]0 = 0.153mol L 1 and that after 115 s the concentration of B rises to 0.034 mol L 1.
by Adam Enomoto 1L
Mon Mar 05, 2018 1:46 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics [ENDORSED]
Replies: 2
Views: 121

Kinetics [ENDORSED]

For lecture today Lavelle showed a graph with reactants and products with two activation energies. Can we automatically assume that the graph with a larger activation energy is the rate determining elementary step?
by Adam Enomoto 1L
Mon Mar 05, 2018 1:41 pm
Forum: Zero Order Reactions
Topic: Will we need to know how to derive equations? [ENDORSED]
Replies: 9
Views: 378

Re: Will we need to know how to derive equations? [ENDORSED]

Will we need to know how to derive the equation involving kforward divided by kreverse
by Adam Enomoto 1L
Mon Mar 05, 2018 1:39 pm
Forum: General Rate Laws
Topic: Homework Problem 15.19C
Replies: 5
Views: 203

Re: Homework Problem 15.19C

Can anyone help me solve for this answer? 15.63 The rate constant of the reaction between CO2 and OH in aqueous solution to give the HCO3 ion is 1.5 1010 L mol 1 s 1 at 25 C. Determine the rate constant at blood temperature (37 C), given that the activation energy for the reaction is 38 kJ mol 1.
by Adam Enomoto 1L
Mon Mar 05, 2018 1:31 pm
Forum: General Rate Laws
Topic: catalytic reaction
Replies: 5
Views: 179

Re: catalytic reaction

Hydrogen peroxide will decompose into water and oxygen gas. Two molecules of hydrogen peroxide will produce two molecules of water and one molecule of oxygen. A catalyst of potassium permanganate can be used to speed up this process. Adding potassium permanganate to the hydrogen peroxide will cause ...
by Adam Enomoto 1L
Mon Mar 05, 2018 1:14 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: determining order
Replies: 3
Views: 122

Re: determining order

What would our units be for a reaction that is half order?
by Adam Enomoto 1L
Mon Mar 05, 2018 1:09 pm
Forum: Zero Order Reactions
Topic: What role do coefficients play?
Replies: 3
Views: 138

Re: What role do coefficients play?

When calculating the rate constant you use the molar coefficients. For k it's products/reactants and each species is raised to its molar coefficients.
by Adam Enomoto 1L
Mon Mar 05, 2018 1:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Kinetics Test
Replies: 3
Views: 149

Re: Kinetics Test

Sorry so that means that lecture from today (March 5th) won't be on the test?
by Adam Enomoto 1L
Mon Mar 05, 2018 1:06 pm
Forum: Experimental Details
Topic: spectroscopy
Replies: 2
Views: 343

Re: spectroscopy

Also using spectroscopy you are able to measure and plot wavelength vs. intensity of light. Finding the optimum wavelength tells you what wavelength the species has the maximum absorbance of the light.
by Adam Enomoto 1L
Mon Mar 05, 2018 1:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011787

Re: Post All Chemistry Jokes Here

Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" — and he died.
by Adam Enomoto 1L
Mon Mar 05, 2018 12:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011787

Re: Post All Chemistry Jokes Here

I had a sodium joke but NA(h)
by Adam Enomoto 1L
Mon Mar 05, 2018 12:54 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Overall reaction order
Replies: 3
Views: 166

Re: Overall reaction order

I'm pretty sure we won't be tested on the reaction order being a fraction.
by Adam Enomoto 1L
Mon Mar 05, 2018 12:53 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Bimolecular Reactions [ENDORSED]
Replies: 2
Views: 122

Re: Bimolecular Reactions [ENDORSED]

species I believe just means any type of molecule. It could be A+B or A+A (a and b representing molecules) in the reaction. Bimolecular just means two molecules having to collide.
by Adam Enomoto 1L
Mon Mar 05, 2018 12:50 pm
Forum: First Order Reactions
Topic: k
Replies: 16
Views: 620

Re: k

Reaction A: k = 2.3 M-1s-1
Reaction B: k = 1.8 Ms-1
Reaction C: k = 0.75 s-1

How do we know which one is a zero order reaction just given the units?
by Adam Enomoto 1L
Mon Mar 05, 2018 12:47 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: k'
Replies: 4
Views: 139

Re: k'

are the units for the forward reaction k the same as the overall reaction k units?
by Adam Enomoto 1L
Mon Mar 05, 2018 12:43 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: 0 order
Replies: 6
Views: 2100

Re: 0 order

In the presence of a catalyst the graph would be the same if it's a zero order reaction. it would be a linear plot.
by Adam Enomoto 1L
Thu Feb 22, 2018 5:53 pm
Forum: Balancing Redox Reactions
Topic: 14.17
Replies: 3
Views: 168

14.17

14.17 (a) Write balanced half-reactions for the redox reaction of an acidified solution of potassium permanganate and iron(II) chloride. (b) Write the balanced equation for the cell reaction and devise a galvanic cell to study the reaction (write its cell diagram). I am stuck on just simply trying t...
by Adam Enomoto 1L
Wed Feb 07, 2018 1:07 pm
Forum: Amphoteric Compounds
Topic: Amphoteric compounds
Replies: 3
Views: 570

Re: Amphoteric compounds

If it reacts as a base or an acid the compound is amphoteric. A great example is water
by Adam Enomoto 1L
Wed Feb 07, 2018 1:03 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: exothermic
Replies: 5
Views: 219

Re: exothermic

The flask is the surroundings and the reaction is the system. When there's an exothermic reaction, the flask will heat up. If there's an endothermic reaction the flask will cool down because heat is going to the system and away from the surroundings
by Adam Enomoto 1L
Fri Feb 02, 2018 12:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 14
Views: 417

Re: Spontaneous

Also it’s spontaneous when delta h is negative and delta s is positive
by Adam Enomoto 1L
Fri Feb 02, 2018 12:01 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.7
Replies: 7
Views: 229

Re: 9.7

I’m confused about what does the fraction means
by Adam Enomoto 1L
Wed Jan 24, 2018 5:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1895

Re: Week 3 Test Topic is endorsed

understanding the concepts just means like being able to interpret what the equations solve for?
by Adam Enomoto 1L
Wed Jan 24, 2018 5:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 2
Views: 183

Re: Midterm

I'm pretty sure it will be just the full coverage of 8 and 9
by Adam Enomoto 1L
Wed Jan 24, 2018 5:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Equations for the test [ENDORSED]
Replies: 1
Views: 115

Equations for the test [ENDORSED]

I know lavelle mentioned that we shouldn't be focused on the problems that are very math heavy, but which equations beside q=mcat should we be completely familiar with for the exam?
by Adam Enomoto 1L
Thu Jan 18, 2018 1:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Equations for gases using R
Replies: 4
Views: 165

Re: Equations for gases using R

Go over it in the book because it will be on our next exam
by Adam Enomoto 1L
Thu Jan 18, 2018 1:01 pm
Forum: Phase Changes & Related Calculations
Topic: HW question
Replies: 5
Views: 215

Re: HW question

I don't think we have gone to the end of chapter 8 yet, but yes all 14 should be from chapter 8
by Adam Enomoto 1L
Wed Jan 10, 2018 3:23 pm
Forum: Phase Changes & Related Calculations
Topic: Endo and Exothermic Ways to Remember
Replies: 28
Views: 2976

Re: Endo and Exothermic Ways to Remember

Also exothermic is when there's a negative delta H compared to endothermic where theres a positive delta H because endothermic heat is being added.
by Adam Enomoto 1L
Wed Jan 10, 2018 3:21 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp,m --> Cv,m
Replies: 2
Views: 341

Re: Cp,m --> Cv,m

I'm pretty sure in the book they derive it, Just google it and you can see how they derive that equation.
by Adam Enomoto 1L
Thu Dec 07, 2017 10:36 pm
Forum: Bronsted Acids & Bases
Topic: identifying based on structure
Replies: 4
Views: 228

Re: identifying based on structure

Ag+ is a lewis acid and F- is a lewis base. Ag+ can accept an electron and F- can donate an electron
by Adam Enomoto 1L
Thu Dec 07, 2017 10:34 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Arrhenius acids and bases
Replies: 2
Views: 188

Re: Arrhenius acids and bases

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of H+ ions in the water. In contrast, an Arrhenius base dissociates in water to form hydroxide ions, OH-. I'm pretty sure we should be comfortable with Lewis, bronsted...
by Adam Enomoto 1L
Tue Nov 28, 2017 1:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Arrangement and Molecular Shape
Replies: 4
Views: 174

Re: Electron Arrangement and Molecular Shape

Do we need to know the difference between electron geometry and molecular geometry for the test?
by Adam Enomoto 1L
Tue Nov 28, 2017 1:04 pm
Forum: Naming
Topic: Thio- ?
Replies: 5
Views: 284

Re: Thio- ?

think about which one is the most electronegative
by Adam Enomoto 1L
Tue Nov 28, 2017 1:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair effect on bond angle
Replies: 2
Views: 277

Re: Lone Pair effect on bond angle

Just think about how seesaw and bent are formed because of the strong repulsion of lone pairs. They effect the molecular shape of the molecule.
by Adam Enomoto 1L
Tue Nov 28, 2017 1:01 pm
Forum: Ideal Gases
Topic: Test 4
Replies: 2
Views: 163

Test 4

For test number 4 should we be comfortable with any of the gas laws?
by Adam Enomoto 1L
Wed Nov 15, 2017 12:52 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Angles
Replies: 8
Views: 428

Re: Bond Angles

Do you think it's fine for us to just put bond angles with greater than or less than signs? like the bond angle is <109.5
by Adam Enomoto 1L
Wed Nov 15, 2017 12:50 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and pi
Replies: 12
Views: 640

Sigma and pi

In every double bond, is it always 1 sigma and 1 pi bond?
by Adam Enomoto 1L
Wed Nov 15, 2017 12:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron geometry vs molecular geometry
Replies: 2
Views: 176

Electron geometry vs molecular geometry

Do we need to know for this upcoming test about identifying a molecules electron geometry vs its molecular geometry?
by Adam Enomoto 1L
Mon Nov 06, 2017 12:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Materials [ENDORSED]
Replies: 7
Views: 412

Re: Midterm Materials [ENDORSED]

We don't need to buy a blue book for the midterm.
by Adam Enomoto 1L
Mon Nov 06, 2017 12:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Materials [ENDORSED]
Replies: 7
Views: 412

Re: Midterm Materials [ENDORSED]

Effective nuclear charge deals is the equation: Zeff = z(atomic number) - S(shielding e-). By subtracting these two you will derive the effective nuclear charge
by Adam Enomoto 1L
Fri Nov 03, 2017 12:24 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem for a Peer Learning Session
Replies: 3
Views: 196

Re: Problem for a Peer Learning Session

The s subshell will lose it's electrons instead of taking it from the d orbital
by Adam Enomoto 1L
Fri Nov 03, 2017 12:21 pm
Forum: Lewis Structures
Topic: Midterm
Replies: 4
Views: 192

Re: Midterm

Yes the midterm is on fundamentals to chapter 3
by Adam Enomoto 1L
Fri Nov 03, 2017 12:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: For the test vsepr and lewis
Replies: 3
Views: 203

For the test vsepr and lewis

For the Chapter 4 test should we be comfortable with naming the lewis structure as well as the VSEPR name. For example, for CH4 do we need to know that it's tetrahedral and trigonal pyramidal?
by Adam Enomoto 1L
Wed Oct 25, 2017 4:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Difference between subshell and orbital [ENDORSED]
Replies: 9
Views: 1153

Re: Difference between subshell and orbital [ENDORSED]

A subshell is a group of orbitals with properties such as shape. An orbital can contain 2 electrons that have opposite spin.
by Adam Enomoto 1L
Wed Oct 25, 2017 4:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration writing
Replies: 8
Views: 368

Re: Electron Configuration writing

I learned in high school that we can fill electron orbitals using the Aufbau principle 2 different ways. One way is you can write electron configurations with the orbitals in order of filling. The other way, which Lavelle wants us to do, is writing electron configurations in order of increasing prin...
by Adam Enomoto 1L
Thu Oct 19, 2017 12:19 pm
Forum: Properties of Light
Topic: EM spectrum
Replies: 6
Views: 397

Re: EM spectrum

I noticed that one of the questions asked us what visible color is of the wavelength 486. Should I know the exact ranges of when purple becoming blue since the answer was blue?
by Adam Enomoto 1L
Thu Oct 19, 2017 12:16 pm
Forum: Properties of Electrons
Topic: Rydberg's formula
Replies: 6
Views: 551

Re: Rydberg's formula

I'm also confused as to when to make the value of r negative. I know lavelle mentioned that it was negative if energy was released, but I have yet to see a problem where it needed to be negative.
by Adam Enomoto 1L
Thu Oct 12, 2017 3:40 pm
Forum: Properties of Light
Topic: Wavelengths and Frequency of Electromagnetic Radiation [ENDORSED]
Replies: 7
Views: 456

Re: Wavelengths and Frequency of Electromagnetic Radiation [ENDORSED]

The only ones we need to know is that visible light is from 400nm to 700nm. We don't need to know what UV or gamma radiation's wavelengths are. I'm sure it'll be good to know what order it goes in though.
by Adam Enomoto 1L
Thu Oct 12, 2017 3:38 pm
Forum: Einstein Equation
Topic: Einstein
Replies: 4
Views: 293

Einstein

When Einstein figured that particles make up electromagnetic radiation, did he name them photons or was that someone else?
by Adam Enomoto 1L
Tue Oct 03, 2017 12:43 pm
Forum: Balancing Chemical Reactions
Topic: Order of steps
Replies: 6
Views: 519

Re: Order of steps

My best advice is to write out what elements are involved separately and as I add coefficients to the molecules, I then count how many moles of that element are on each side.
by Adam Enomoto 1L
Tue Oct 03, 2017 12:40 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Module Question 24?
Replies: 2
Views: 171

Re: Molarity Module Question 24?

I just tried it and I used this method:
M1V1 = M2V2
0.642*V1 = 0.101*1000
V1 = 0.101*1000/0.642
V1 = 157.3ml

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