CHEMISTRY COMMUNITY

PaulPatel

When I was looking at it, I think that the torsional strain causes for the CH3 to be eclipsed again after the gauche conformation (force, or torsional strain was applied after the molecule had reached gauche formation). Consequently, the torsional strain would make it eclipsed again. However, after ...

PaulPatel

I do not believe that it is necessary or even most efficient to simply memorize all of the electrophiles and nucleophiles presented in the course reader. Rather, it would be more beneficial in my opinion to know the definition behind each (Nucleophile wants to go to the positive stuff, Electrophile ...

PaulPatel

Essentially in this problem you are manipulating the equations to achieve your answer. First you start with the half life reaction where T1/2 = 1/k[A]o. From there you would solve for k to obtain the rate constant so that you can employ it in the second order reaction equation. The part where you mi...

PaulPatel

Hello! I have a general equation about how to perform a half life calculation. If we were given a table where we were given original concentration of a molecule [A], but were asked to convert the data into 1/[A] (second order reaction), would you use the [A] initial concentration or the 1/[A] concen...

PaulPatel

Hello, The question reads: A 1.0M NiSO4 (aq) solution was electrolyzed by using inert electrodes. Write (a) the cathode reaction; (b) the anode reaction I know that for the cathode reaction it would involve the Ni molecule ( Ni2+ + 2e --> Ni) However, I am not understanding why the anode reaction in...

PaulPatel

I was looking through past posts, and read that in cell notations, the left side is always the anode and the right side will always be the cathode. Is this why the right side of the cell notation is flipped? Is this always the case?

PaulPatel

Hello the question reads: Write the half reactions and balanced equation for the cell reaction for the following galvanic cell: Pt(s) | O2(g) | H+(aq) || OH-(aq) | O2(g) | Pt(s) My first question is would we have been given a table of half reactions on the midterm to choose the correct half reaction...

PaulPatel

I believe the oxidation state of ozone would be 0 since it is a tri-atomic form of oxygen. Since it is not paired with anything in specific, it would have an oxidation state of 0. Even though it is a very reactive substance I believe, since it is by itself and is not paired in a particular compound,...

PaulPatel

The question states to calculate the standard enthalpy of formation of dinitrogen pentoxide from the following data, 2NO + O2 --> 2NO2 where deltaH = -114.1 kJ 4NO2 + O2 --> 2N2O5 where delta H = -110.2 kJ and from the standard enthalpy of formation of nitric oxide, NO (see appendix 2A) When I looke...

PaulPatel

The first law of thermodynamics states that the internal energy of an isolated system will be constant. the equation is deltaU = q + w When looking at this equation, will the value of deltaU be 0 due to the fact that the internal energy has to be constant? Do the heat and work cancel out with each o...

PaulPatel

Yes the person above has a great answer to the question, and I would like to add a bit more just for memorization's sake. For a bomb calorimeter, you should always assume that it is an isolated system, because that is how the contraption is created. It does not want to release any heat and expose th...

PaulPatel

Yes the person above has the correct idea! I can offer an example to further clarify the details as well. So say that you react CH3COOH with NaOH to form Na+CH3OO- and water. The salt in this case would be Na+CH3OO- where CH3COO- would be the conjugate base of the acid. Now look when the salt dissoc...

PaulPatel

When my TA was explaining the concept of sig figs in regards to pH she said that you would begin counting the sig figs after the decimal point. So say that you have a pH = 2.37, you would have two significant figures in the answer because you begin counting after the decimal. I hope this helped!

PaulPatel

As the person above said, a neutralization reaction is basically just a fancy way of saying a reaction between an acid and base to make a salt and water. You should know that a neutralization reaction will always make water, so that is a good indicator to see if something is a neutralization reactio...

PaulPatel

Hello! When talking about buffers, I noticed that the usage of a salt was employed for the weak acid (conjugate base in form of salt), and for the weak base (conjugate acid in form of salt). Is the salt employed because it does not drastically fluctuate the pH, and you want to get the pH of the solu...

PaulPatel

Hello! In the last Quiz 3 preparation quizzes, question 6 provides the equilibrium constant as 2.1 x 10^-3 but also gives the concentration of initial I2 to be 3.18 x 10^-4. I was wondering whether the final answer would retain the same amount of significant figures as the equilibrium constant (beca...

PaulPatel

Hello! I was just wondering if there was a molecule like N2- if you would use the modified molecular orbital diagram that Lavelle used for z < 8. Since there is an extra electron, would you have to use the z > or equal to 8 one? I am thinking that since only an electron is added and the nuclear char...

PaulPatel

Hello Community!

I am wondering what the difference is between polarizability and increasing polarizing power. I saw that they had opposite trends and was a bit confused on how that worked. What are the fundamental differences between the two?

Thank you!

PaulPatel

Hello!

@Chem_Mod , I believe that you said that DeltaE is equal to the Energy Initial - Energy Final. However, in the course reader, I saw that the Delta Energy was equal to Energy Final - Energy Initial.

I am a bit confused on this part, would you mind clarifying?

Thank you!!!

PaulPatel

Hello! I was wondering what the significant differences were between electronegativity and electron affinity. I think they follow the same general trend of increasing to the right of the period and up a column. However, I do not know what the difference is between the two terms and get mixed up. Ele...

PaulPatel

Hello! The question reads "Lines in the Balmer series of the hydrogen spectrum are observed at 656.3, 486.1, 434.0, and 410.2 nm. What is the wavelength of the next line in the series?" ^^^ I have tried using Professor Lavelle's method from his Course Reader where En = -hR/n , but cannot s...

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Torsional strain (Eclipsed to gauche)

Re: nucleophiles vs electrophiles

Re: 15.35

Question about Half-Life

Question about 14.55 (cathode/anode rxn)

Re: Question about 14.11 part D

Question about 14.11 part D

Re: Balancing Redox Reactions

Question on 8.65

Clarification on First Law of Thermodynamics

Re: Isolated systems

Re: Salt acidic or basic?

Re: pH Sig figs

Re: 2010 Final Q7B neutralization reaction

Question about Buffers and Use of a Salt

Question regarding significant figures in equilibrium calc.

Question behind Molecular Orbital Theory

Polarizability vs Increasing Polarizing Power

Re: Principle Quantum Level

Electronegativity vs Electron Affinity

Confused on Problem 1.57 (regarding the Balmer Series)