Search found 62 matches

by Jason Muljadi 2C
Sun Mar 18, 2018 10:53 pm
Forum: General Science Questions
Topic: Grade
Replies: 8
Views: 537

Re: Grade

The class is graded for sure.
by Jason Muljadi 2C
Sun Mar 18, 2018 8:54 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: mechanism differentiation
Replies: 2
Views: 158

Re: mechanism differentiation

You find the slowest step and you find the concentration of the fast step. If there is a catalyst or intermediate, you have to isolate that and put everything on the other side. Then, you can plug in those values into the rate law of your fast step.
by Jason Muljadi 2C
Sun Mar 18, 2018 8:50 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: nucleophiles
Replies: 3
Views: 332

Re: nucleophiles

I think of nucleophiles as something that is "positive" loving, so it wants to be paired up by something with a positive charge in order to make it more stable/have a 0 charge.
by Jason Muljadi 2C
Sun Mar 18, 2018 8:47 pm
Forum: General Science Questions
Topic: Grade
Replies: 8
Views: 537

Re: Grade

I'd check the Bruinwalk reviews, but our class is kinda odd because we were doing well, from what I heard. I would expect a curve, but not by much.
by Jason Muljadi 2C
Sun Mar 18, 2018 8:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 186
Views: 39260

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, I hated chemistry in high school and I honestly was dreadful in it. I had a good teacher, don't get me wrong. It just felt like chemistry and I had a terrible relationship. I decided to give chemistry one final go. Going into my fall quarter, I had resigned to myself that if I didn't li...
by Jason Muljadi 2C
Sun Mar 18, 2018 8:22 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL
Replies: 9
Views: 441

Re: FINAL

Functional groups and possibly an SN2 reaction will be covered in the final.
by Jason Muljadi 2C
Sat Mar 17, 2018 9:52 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Graph
Replies: 2
Views: 204

Arrhenius Graph

Are the axis always going to be 1/T for the x axis and ln(k) for the y axis? And why or why not?
by Jason Muljadi 2C
Sat Mar 17, 2018 9:46 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Final Winter 2013
Replies: 3
Views: 163

Re: Final Winter 2013

Can't you also tell because there is (OH)2 meaning that there will be 4e-'s due to the charge of O always being 2- and there's 2 of them?
by Jason Muljadi 2C
Thu Mar 15, 2018 3:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Lavelle: Professor by day, wizard by night
Replies: 6
Views: 428

Re: Lavelle: Professor by day, wizard by night

Jade, you're the true MVP of our discussion.

I thoroughly enjoy watching these old extra credit videos. They're pretty helpful actually!

And somebody better give Dr. Lavelle an Oscar!
by Jason Muljadi 2C
Sat Mar 10, 2018 2:30 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: HW 15.49
Replies: 5
Views: 348

Re: HW 15.49

So, if it was the slow step, would we then disregard HOBr? And it's because the slow step determines the overall rate of the reaction right?
by Jason Muljadi 2C
Sun Mar 04, 2018 6:59 pm
Forum: First Order Reactions
Topic: Units in 15.29
Replies: 2
Views: 87

Units in 15.29

I thought that it was standard to change your units from whatever unit of time to seconds. Why did the book express the answers in terms of minutes? And how do we know when to switch up the units or to let them stay the same?
by Jason Muljadi 2C
Sat Mar 03, 2018 3:11 pm
Forum: General Rate Laws
Topic: 15.17
Replies: 1
Views: 61

15.17

For part C, why do we use the first experiment's values to find the reaction rate constant? Shouldn't we do them all and average them out? Or will it be the same regardless?
by Jason Muljadi 2C
Tue Feb 27, 2018 6:08 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Unique Average Rate vs. Average Rate
Replies: 3
Views: 92

Unique Average Rate vs. Average Rate

Is there a difference between these two terms or are they interchangeable?
by Jason Muljadi 2C
Tue Feb 27, 2018 6:07 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Hw 15.1 [ENDORSED]
Replies: 7
Views: 183

Re: Hw 15.1 [ENDORSED]

Yes, because the rate of N2 is simply the rate of H2 x mols of N2/H2
by Jason Muljadi 2C
Sun Feb 25, 2018 11:36 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Problem 15.101 [ENDORSED]
Replies: 1
Views: 82

Problem 15.101 [ENDORSED]

How exactly does the rate law differ if the reactions were carried out in an organic solvent? I'm not really understanding this concept.
by Jason Muljadi 2C
Sun Feb 25, 2018 11:32 pm
Forum: Environment, Ozone, CFCs
Topic: Test 3 Kinetics and Environment
Replies: 1
Views: 179

Test 3 Kinetics and Environment

Will we be tested on a kinetics and environment problem? If so, what will we have to know about the environment?
by Jason Muljadi 2C
Sun Feb 18, 2018 9:32 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Iron Reduction
Replies: 1
Views: 171

Iron Reduction

Why does iron have a tendency to reduce silver? Is it because of its standard potential?
by Jason Muljadi 2C
Sun Feb 18, 2018 9:20 pm
Forum: Balancing Redox Reactions
Topic: "Rules"
Replies: 7
Views: 153

Re: "Rules"

The book has these set of rules that I've abided by that I think is pretty helpful. It's under Section 14.2. Step 1. Identify the species being oxidized and the species being reduced by looking at the change of oxidation numbers. Step 2. Write two skeletal equations (unbalanced) for oxidation and re...
by Jason Muljadi 2C
Sun Feb 18, 2018 9:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: The Daniell Cell
Replies: 4
Views: 66

The Daniell Cell

Is the Daniell cell basically the only example of a galvanic cell that we need to know for this course? Or do we need to know more examples?
by Jason Muljadi 2C
Sun Feb 11, 2018 3:01 pm
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: Hemoglobin and Equilibrium
Replies: 1
Views: 195

Hemoglobin and Equilibrium

How does the hemoglobin help your body to reach equilibrium or to achieve the process of homeostasis?
by Jason Muljadi 2C
Sun Feb 11, 2018 2:54 pm
Forum: Balancing Redox Reactions
Topic: nernst eq'n
Replies: 2
Views: 53

Re: nernst eq'n

I'm pretty sure that n is the number or moles of electrons transferred in the reaction when you balanced it.
by Jason Muljadi 2C
Sun Feb 11, 2018 2:46 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Total Entropy of the Freezing of Water
Replies: 2
Views: 159

Re: Total Entropy of the Freezing of Water

Another thing to note is that, when there is an isothermal, reversible expansion of a gas, delta S tot = 0. When there is an isothermal, irreversible free expansion of a gas, the internal energy is 0, meaning work is equal to 0, so q is equal to 0. This means that delta S is equal to 0. This doesn't...
by Jason Muljadi 2C
Sun Feb 11, 2018 2:45 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Total Entropy of the Freezing of Water
Replies: 2
Views: 159

Re: Total Entropy of the Freezing of Water

Generally when at equilibrium, delta S tot = 0. Keep in mind that the equation for total entropy is delta S tot = delta S surr + delta S sys . With water, you want to take into account that there is an unfavorable phase change, so you would have to take into account - delta S fus and you have to tak...
by Jason Muljadi 2C
Sun Feb 04, 2018 5:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Content Question
Replies: 4
Views: 156

Re: Midterm Content Question

I would assume that we would cover electrochemistry. So I'd assume that the midterm will cover Chapter 8, 9, part of 11, and part of 14. We probably won't be asked to derive the equations, but we probably have to know how to apply them.
by Jason Muljadi 2C
Sun Feb 04, 2018 1:56 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Midterm
Replies: 6
Views: 195

Re: Midterm

It's also nice to just know the derivations. In case you are stuck on a question, I find that knowing the derivations and where exactly they come from helps to push me back on track.
by Jason Muljadi 2C
Sun Feb 04, 2018 1:54 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G not
Replies: 5
Views: 102

Re: Delta G not

ΔG° is in standard condition, so you would have to calculate ΔH° and ΔS°, just like you would in the regular Gibbs Free Energy equation.
by Jason Muljadi 2C
Fri Jan 26, 2018 4:49 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Formation of Snow in Clouds [ENDORSED]
Replies: 5
Views: 490

Formation of Snow in Clouds [ENDORSED]

Can someone explain to me why the formation of snow in the clouds is an exothermic reaction? I saw this on the Internet while studying for my test and now I am thoroughly confused.
by Jason Muljadi 2C
Fri Jan 26, 2018 9:42 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Iron Rusting: Exo or Endo? [ENDORSED]
Replies: 4
Views: 179

Iron Rusting: Exo or Endo? [ENDORSED]

Can someone explain to me why iron rusting is an exothermic reaction?
by Jason Muljadi 2C
Wed Jan 24, 2018 10:39 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Formation of a Cation from an Atom
Replies: 3
Views: 183

Formation of a Cation from an Atom

Can someone explain to me if the formation a cation from an atom in the gas phase is an endothermic or exothermic reaction? I saw this on the Internet while studying for my test and now I am thoroughly confused.
by Jason Muljadi 2C
Sun Jan 21, 2018 12:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.31
Replies: 3
Views: 74

Re: 8.31

The general equation that you're going to use is nC(delta)T or mC(delta)T. Now, C can either be C p , which is constant pressure or C v , which is constant volume. When you have C p , you would use 5/2 R. When you have C v , you would use 3/2 R. The R will be the gas constant, so you have to look at...
by Jason Muljadi 2C
Sun Jan 21, 2018 12:06 am
Forum: Phase Changes & Related Calculations
Topic: Question 8.87- Breaking phase changes up into steps [ENDORSED]
Replies: 4
Views: 421

Re: Question 8.87- Breaking phase changes up into steps [ENDORSED]

For step 2, I realized that we had to use dHfus= 6.01 kJ.mol^-1. Do we always use this value whenever we are melting ice and only when we are melting ice at 0 degrees C?
by Jason Muljadi 2C
Sat Jan 20, 2018 4:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1
Replies: 3
Views: 174

Re: Test 1

On the class site, Dr. Lavelle said that "Concept questions involving work and internal energy will be on Test 1, but not calculating w and delta U" Conceptionally, we are supposed to understand work and internal energy. But we will not have to solve for questions that uses delta U = q + w...
by Jason Muljadi 2C
Sat Jan 13, 2018 4:11 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy of physical change?
Replies: 3
Views: 112

Re: Enthalpy of physical change?

I'd like to start off by saying: there is no such thing as a stupid question! Every question that you have is valid, including this one. Standard enthalpies will be given to you; no worries. Table 8.3 lists some of the enthalpies for common substances, including water. All of the values given to you...
by Jason Muljadi 2C
Sat Jan 13, 2018 4:02 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Work vs. Heat
Replies: 6
Views: 206

Re: Work vs. Heat

I'd like to think that heat is basically the energy expended molecularly while work is more on a macro basis. Work is basically like you pushing a box; you know that energy is being used there and you can see it and feel it. Now, if you were to boil water, energy is expended molecularly because the ...
by Jason Muljadi 2C
Tue Jan 09, 2018 7:59 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Paths and Changes of State
Replies: 3
Views: 179

Paths and Changes of State

In this course, do we have to draw out the path of the state of change from one substance to another? And do we also have to describe, from the path that we drew, whether the process was reversible, irreversible, adiabatic, isobaric, isothermal..etc.? To clarify, I have an example of a path down att...
by Jason Muljadi 2C
Sat Dec 09, 2017 2:55 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 2
Views: 147

Re: Polarity

Basically, you want to look and see if the dipole moments cancel out. You can definitely look at the charges, which means you are looking to see whether there are lone pairs on the central atoms or there exists a lack or abundance of lone pairs from the outer atoms that make the outer atoms have a p...
by Jason Muljadi 2C
Sat Dec 09, 2017 2:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Non polar vs. Polar molecule Video example
Replies: 2
Views: 621

Re: Non polar vs. Polar molecule Video example

First of all, nice video!

So, basically, anything with lone pairs is polar? If you were giving AXmEn, with m and n being whatever number you choose, you would think immediately, "Aha! This is a polar molecule!"?
by Jason Muljadi 2C
Fri Dec 08, 2017 1:15 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 2013 Final Q5C
Replies: 1
Views: 108

2013 Final Q5C

Consider the follow reaction: Ni(CO) 4 (g) <--> Ni(s) + 4 CO(g) If the initial concentration of Ni(CO) 4 (g) is 1.0 M, and "x" is the equilirium concentration of CO(g), write a general expression for the equilibrium constant K c in terms of x. For this problem, I used an ICE Table to get m...
by Jason Muljadi 2C
Wed Dec 06, 2017 8:42 am
Forum: Administrative Questions and Class Announcements
Topic: Classes Today? [ENDORSED]
Replies: 2
Views: 220

Classes Today? [ENDORSED]

Will there be classes and review sessions today? There is a fire near UCLA right now and I was wondering if classes and review sessions are still in effect.
by Jason Muljadi 2C
Sun Dec 03, 2017 10:13 pm
Forum: Naming
Topic: Iron v ferrate in coordination compound naming
Replies: 8
Views: 1017

Re: Iron v ferrate in coordination compound naming

alyssawhite1L wrote:are there any other elements where the latin name is different from the name we know, other than iron?


Other than iron, I would say these following metals are different from the name that we know.

Copper = Cuprate

Lead = Plumbate

Silver = Argenate

Gold = Aurate

Tin = Stannate
by Jason Muljadi 2C
Sat Dec 02, 2017 9:56 pm
Forum: Bronsted Acids & Bases
Topic: Question J.5 [ENDORSED]
Replies: 2
Views: 224

Question J.5 [ENDORSED]

Complete the overall equation, and write the complete ionic equation and the net ionic equation for each of the following acid–base reactions. If the substance is a weak acid or base, leave it in its molecular form in the equations. (b) (CH 3 ) 3 N(aq) + HNO 3 (aq) --> For B, why does it become (CH...
by Jason Muljadi 2C
Sat Dec 02, 2017 9:41 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B Syllabus
Replies: 1
Views: 176

Re: 14B Syllabus

I assume that the syllabus will not be posted until the end of Chem 14A. But, for the Winter Quarter 2017, the dates were: Quiz 1: Starting Tuesday Jan. 31 in discussion section. Midterm: exam Wednesday Feb. 15 from 6 to 8pm. Quiz 2: Starting Tuesday Feb. 21 in discussion section. Quiz 3: Starting T...
by Jason Muljadi 2C
Sun Nov 26, 2017 12:55 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q.11.37
Replies: 1
Views: 136

Q.11.37

For the reaction N 2 (g) + 3 H 2 (g) Δ 2 NH 3 (g) at 400. K, K = 41. Find the value of K for each of the following reactions at the same temperature: (a) 2 NH 3 (g) --> <-- N 2 (g) + 3 H 2 (g) (b) (1/2) N 2 (g) + (3/2) H 2 (g) --> <-- NH 3 (g) (c) 2 N 2 (g) + 6 H 2 (g) --> <-- 4 NH 3 (g) Am I suppos...
by Jason Muljadi 2C
Sat Nov 25, 2017 11:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Molecules in Subscript
Replies: 3
Views: 137

Molecules in Subscript

Do you only have your molecules in subscript (i.e. PH2O) when you have just K? I noticed that, when the question asks for Kc, you don't need to write out P(molecule) to find your equilibrium constant.
by Jason Muljadi 2C
Sun Nov 19, 2017 9:42 pm
Forum: Biological Examples
Topic: Other Biological Examples
Replies: 5
Views: 324

Re: Other Biological Examples

Chromium has a very interesting biological function. It assists insulin by helping it control blood sugar, I believe.
by Jason Muljadi 2C
Sun Nov 19, 2017 9:37 pm
Forum: Hybridization
Topic: General Hybridization
Replies: 3
Views: 165

Re: General Hybridization

chemistNATE is always a fantastic resource! I hope this video helps.

https://youtu.be/YcSPPKESpwc
by Jason Muljadi 2C
Thu Nov 09, 2017 2:53 pm
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration and d-block (3.11)
Replies: 2
Views: 149

Re: Electron Configuration and d-block (3.11)

The 5th period is where things get a little funky, so I don't think you have to worry about those elements too much. The short answer is that it's more stable when it has that configuration you are talking about, instead of what we expected to get. When you're dealing with 4d, the more stable config...
by Jason Muljadi 2C
Fri Nov 03, 2017 3:18 pm
Forum: Hybridization
Topic: Writing out the Hybridization [ENDORSED]
Replies: 4
Views: 241

Writing out the Hybridization [ENDORSED]

Is this where you would utilize px, py, and pz? And is there a common trend to remember hybridization that one can follow?
by Jason Muljadi 2C
Fri Nov 03, 2017 3:14 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 3
Views: 212

Sigma and Pi Bonds

Do sigma bonds simply that there is a sharing of two electrons between one elect to another? If so, can we also say that pi bonds are the double bonds? I'm a little bit confused on how these bonds can correlate to the material we have previously learned.
by Jason Muljadi 2C
Sat Oct 28, 2017 12:43 pm
Forum: Trends in The Periodic Table
Topic: Carbon Electron Affinity [ENDORSED]
Replies: 3
Views: 181

Carbon Electron Affinity [ENDORSED]

I asked this question in a previous forum but it didn't get answered. Why is it that carbon has a higher affinity than nitrogen when nitrogen is at the right of the carbon? I thought that as you go more right, there is a higher electron affinity. What is the exception with carbon that makes it have ...
by Jason Muljadi 2C
Thu Oct 26, 2017 11:19 am
Forum: SI Units, Unit Conversions
Topic: Quantum Mechanics
Replies: 4
Views: 249

Re: Quantum Mechanics

Why is it that carbon has a higher affinity than nitrogen when nitrogen is at the right of the carbon? I thought that as you go more right, there is a higher electron affinity. What is the exception with carbon that makes it have a higher electron affinity?
by Jason Muljadi 2C
Mon Oct 23, 2017 9:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3
Replies: 2
Views: 180

Test 3

Will Test 3 include parts of Chapter 3 or will we stop with just parts of Chapter 1 and 2?
by Jason Muljadi 2C
Sat Oct 21, 2017 10:08 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quantum Number l exception [ENDORSED]
Replies: 4
Views: 227

Quantum Number l exception [ENDORSED]

We presume that, to find l, it is literally (n-1), correct? Now, would the only exception be when n is at an s-orbital, like 2s, 3s, or 4s? For instance, at 2s, isn't l = 0 because there's not really an orbital angular momentum until we reach 2p?
by Jason Muljadi 2C
Thu Oct 19, 2017 1:23 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Ground state vs excited state
Replies: 3
Views: 182

Re: Ground state vs excited state

The Rydberg Formula is basically used to find or predict the wavelength of the light from an electron as the electron moves from one energy level to another. If you remember Rydberg's formula, there was an n 1 and an n 2 energy level. Those are the principle quantum numbers that tells you the energy...
by Jason Muljadi 2C
Tue Oct 10, 2017 10:50 am
Forum: Properties of Light
Topic: Amplitude
Replies: 6
Views: 339

Re: Amplitude

Amplitude is related to the energy of the wave. If the wave has a low energy, then there will be a short amplitude. If the energy of a wave is high, then there will be a long amplitude.
by Jason Muljadi 2C
Tue Oct 10, 2017 10:42 am
Forum: Properties of Light
Topic: Chapter 1, problem 3 [ENDORSED]
Replies: 10
Views: 538

Re: Chapter 1, problem 3 [ENDORSED]

For this question, my reasoning was that the answer would be A) the speed of the radiation decreases as frequency of electromagnetic radiation decreases, because a higher frequency means that more waves are traveling per second or more cycles per second. The solutions manual, however, states that A...
by Jason Muljadi 2C
Tue Oct 03, 2017 9:46 am
Forum: Empirical & Molecular Formulas
Topic: F.23 Question [ENDORSED]
Replies: 5
Views: 345

F.23 Question [ENDORSED]

The CO 2 produced by the combustion of hydrocarbons contributes to global warming. Rank the following fuels according to increasing mass percentage of carbon: (a) ethene, C 2 H 2 ; (b) propanol, C 2 H 2 OH; (c) heptane, C 2 H 16 . Do you simply take the amount of carbon from each hydrocarbon and div...
by Jason Muljadi 2C
Mon Oct 02, 2017 12:14 pm
Forum: Limiting Reactant Calculations
Topic: Question M.1 [ENDORSED]
Replies: 4
Views: 536

Question M.1 [ENDORSED]

Hydrazine, N2H4, is an oily liquid used as a rocket fuel. It can be prepared in water by oxidizing ammonia with hypochlorite ions: 2 NH31g2  ClO1aq2 S N2H41aq2  Cl1aq2  H2O1l2. When 35.0 g of ammonia reacted with an excess of hypochlorite ion, 25.2 g of hydrazine was produced. What is the perce...

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