CHEMISTRY COMMUNITY

Jason Muljadi 2C

The class is graded for sure.

Jason Muljadi 2C

Jason Muljadi 2C

Jason Muljadi 2C

Jason Muljadi 2C

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.

Jason Muljadi 2C

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.

Jason Muljadi 2C

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.

Jason Muljadi 2C

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...

Jason Muljadi 2C

Functional groups and possibly an SN₂ reaction will be covered in the final.

Jason Muljadi 2C

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?

Jason Muljadi 2C

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?

Jason Muljadi 2C

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!

Jason Muljadi 2C

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?

Jason Muljadi 2C

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?

Jason Muljadi 2C

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?

Jason Muljadi 2C

Is there a difference between these two terms or are they interchangeable?

Jason Muljadi 2C

Yes, because the rate of N₂ is simply the rate of H₂ x mols of N₂/H₂

Jason Muljadi 2C

How exactly does the rate law differ if the reactions were carried out in an organic solvent? I'm not really understanding this concept.

Jason Muljadi 2C

Will we be tested on a kinetics and environment problem? If so, what will we have to know about the environment?

Jason Muljadi 2C

Jason Muljadi 2C

Why does iron have a tendency to reduce silver? Is it because of its standard potential?

Jason Muljadi 2C

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...

Jason Muljadi 2C

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?

Jason Muljadi 2C

How does the hemoglobin help your body to reach equilibrium or to achieve the process of homeostasis?

Jason Muljadi 2C

I'm pretty sure that n is the number or moles of electrons transferred in the reaction when you balanced it.

Jason Muljadi 2C

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...

Jason Muljadi 2C

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...

Jason Muljadi 2C

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.

Jason Muljadi 2C

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.

Jason Muljadi 2C

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.

Jason Muljadi 2C

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.

Jason Muljadi 2C

Can someone explain to me why iron rusting is an exothermic reaction?

Jason Muljadi 2C

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.

Jason Muljadi 2C

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...

Jason Muljadi 2C

For step 2, I realized that we had to use dH_fus= 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?

Jason Muljadi 2C

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...

Jason Muljadi 2C

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...

Jason Muljadi 2C

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 ...

Jason Muljadi 2C

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...

Jason Muljadi 2C

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...

Jason Muljadi 2C

First of all, nice video!

So, basically, anything with lone pairs is polar? If you were giving AX_mE_n, with m and n being whatever number you choose, you would think immediately, "Aha! This is a polar molecule!"?

Jason Muljadi 2C

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...

Jason Muljadi 2C

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.

Jason Muljadi 2C

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

Jason Muljadi 2C

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...

Jason Muljadi 2C

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...

Jason Muljadi 2C

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...

Jason Muljadi 2C

Do you only have your molecules in subscript (i.e. P_H2O) when you have just K? I noticed that, when the question asks for K_c, you don't need to write out P_(molecule) to find your equilibrium constant.

Jason Muljadi 2C

Chromium has a very interesting biological function. It assists insulin by helping it control blood sugar, I believe.

Jason Muljadi 2C

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

https://youtu.be/YcSPPKESpwc

Jason Muljadi 2C

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...

Jason Muljadi 2C

Is this where you would utilize p_x, p_y, and p_z? And is there a common trend to remember hybridization that one can follow?

Jason Muljadi 2C

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.

Jason Muljadi 2C

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 ...

Jason Muljadi 2C

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?

Jason Muljadi 2C

Will Test 3 include parts of Chapter 3 or will we stop with just parts of Chapter 1 and 2?

Jason Muljadi 2C

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?

Jason Muljadi 2C

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...

Jason Muljadi 2C

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.

Jason Muljadi 2C

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...

Jason Muljadi 2C

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...

Jason Muljadi 2C

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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