CHEMISTRY COMMUNITY

Adam Enomoto 1L

https://www.quora.com/What-is-the-order ... n-of-ozone
This explains the rate law for ozone

Adam Enomoto 1L

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

Adam Enomoto 1L

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...

Adam Enomoto 1L

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.

Adam Enomoto 1L

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?

Adam Enomoto 1L

Will we need to know how to derive the equation involving kforward divided by kreverse

Adam Enomoto 1L

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.

Adam Enomoto 1L

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 ...

Adam Enomoto 1L

What would our units be for a reaction that is half order?

Adam Enomoto 1L

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.

Adam Enomoto 1L

Sorry so that means that lecture from today (March 5th) won't be on the test?

Adam Enomoto 1L

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.

Adam Enomoto 1L

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.

Adam Enomoto 1L

I had a sodium joke but NA(h)

Adam Enomoto 1L

I'm pretty sure we won't be tested on the reaction order being a fraction.

Adam Enomoto 1L

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.

Adam Enomoto 1L

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?

Adam Enomoto 1L

are the units for the forward reaction k the same as the overall reaction k units?

Adam Enomoto 1L

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.

Adam Enomoto 1L

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...

Adam Enomoto 1L

If it reacts as a base or an acid the compound is amphoteric. A great example is water

Adam Enomoto 1L

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

Adam Enomoto 1L

Also it’s spontaneous when delta h is negative and delta s is positive

Adam Enomoto 1L

I’m confused about what does the fraction means

Adam Enomoto 1L

understanding the concepts just means like being able to interpret what the equations solve for?

Adam Enomoto 1L

I'm pretty sure it will be just the full coverage of 8 and 9

Adam Enomoto 1L

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?

Adam Enomoto 1L

Go over it in the book because it will be on our next exam

Adam Enomoto 1L

I don't think we have gone to the end of chapter 8 yet, but yes all 14 should be from chapter 8

Adam Enomoto 1L

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.

Adam Enomoto 1L

I'm pretty sure in the book they derive it, Just google it and you can see how they derive that equation.

Adam Enomoto 1L

Ag+ is a lewis acid and F- is a lewis base. Ag+ can accept an electron and F- can donate an electron

Adam Enomoto 1L

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...

Adam Enomoto 1L

Do we need to know the difference between electron geometry and molecular geometry for the test?

Adam Enomoto 1L

think about which one is the most electronegative

Adam Enomoto 1L

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.

Adam Enomoto 1L

For test number 4 should we be comfortable with any of the gas laws?

Adam Enomoto 1L

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

Adam Enomoto 1L

In every double bond, is it always 1 sigma and 1 pi bond?

Adam Enomoto 1L

Do we need to know for this upcoming test about identifying a molecules electron geometry vs its molecular geometry?

Adam Enomoto 1L

We don't need to buy a blue book for the midterm.

Adam Enomoto 1L

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

Adam Enomoto 1L

The s subshell will lose it's electrons instead of taking it from the d orbital

Adam Enomoto 1L

Yes the midterm is on fundamentals to chapter 3

Adam Enomoto 1L

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?

Adam Enomoto 1L

A subshell is a group of orbitals with properties such as shape. An orbital can contain 2 electrons that have opposite spin.

Adam Enomoto 1L

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...

Adam Enomoto 1L

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?

Adam Enomoto 1L

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.

Adam Enomoto 1L

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.

Adam Enomoto 1L

When Einstein figured that particles make up electromagnetic radiation, did he name them photons or was that someone else?

Adam Enomoto 1L

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.

Adam Enomoto 1L

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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