CHEMISTRY COMMUNITY

Wayland Leung

Do we put catalysts in the overall rate law or do we leave them out just like we leave intermediates out of the rate law?

Wayland Leung

The slope would be -k because the amount of reactants is decreasing over time.

Wayland Leung

So we would need to know all the functional groups and their line diagrams and how to draw them?

Wayland Leung

Wayland Leung

What is useful about knowing the order of the reactants?

Wayland Leung

What are the things that affect the rate constant,k?

Wayland Leung

Why do we not include any intermediates in the overall rate law when the intermediates are a part of the slow step?

Wayland Leung

Are there any constants we need to use in this unit?

Wayland Leung

I remember lavelle saying we won't need to focus in them because they rarely happen. Only 1st and 2nd and 0th

Wayland Leung

What does the "order" of a reaction mean? What is the difference between a first, second, third, or zeroth order reaction?

Wayland Leung

Yea O2 has oxidation number of 2- for each oxygen.

Wayland Leung

Platinum is added when there is no metal or electrode, it is used because it is chemically inert and rarely reacts. The Cl(aq) is separated because there is a phase change between it and Cl2(g).

Wayland Leung

The water is added to balance out the H+ or H3O+ ions in the reaction. It doesn't matter which side you add water. Water is added to balance out the hydrogens in the reaction. Water is there only for an acidic solution and an aqueous solution.

Wayland Leung

When a system is reversible, it can be implied that the system is at equilibrium so yes the deltaS of the system would equal the negative deltaS of the surroundings.

Wayland Leung

n represents the number of moles in the problem. If we are given the mass in grams, we would convert to moles by dividing by the molar mass.

Wayland Leung

We would take the given amount of grams and divide by the molar mass of each element to obtain the number of moles of each element then plug it into the equation.

Wayland Leung

OIL RIG is a good one to memorize the difference between oxidation and reduction. It is an abstract word that is easy to remember.

Wayland Leung

In class we also learned the "LEO" acronym, where loss of electrons is oxidation. That could be a easy way to memorize what oxidation is.

Wayland Leung

Is the salt bridge composed of anions or cations?

Wayland Leung

So we only use the C value when there is a constant pressure value and use the R constant value when the pressure isnt constant?

Wayland Leung

Yea i was also wondering why the heat capacity wasn't needed. Would we be wrong if we used the heat capacity?

Wayland Leung

In the ideal gas law, pressure is the inverse of volume so you flip the pressure values in order to find the change in entropy.

Wayland Leung

What equation would we use if the volume or pressure was not constant to find entropy?

Wayland Leung

What are the equations for degeneracy? In what context would we solve for degeneracy?

Wayland Leung

What does it mean when there are more possible states a gas can occupy?

Wayland Leung

What is the difference between the two?

Wayland Leung

When would we need to use these values of 5/2R and 3/2R? Could you give some context?

Wayland Leung

When would we use the equation q=C (delta)T in a calorimeter problem?

Wayland Leung

Are the calculations for coffee cup calorimetry problems different than bomb calorimeter problems? What are the biggest differences, if any?

Wayland Leung

How are the equations for delta h and delta u different? Are there differenet variables in each equation?

Wayland Leung

The Ex- in exothermic is like the ex- in exit, so heat is leaving the system into the surroundings. Once you know that exothermic is when heat leaves the system, that means endothermic is when heat enters or is absorbed by the system.

Wayland Leung

Does only changing the temperature affect the Kw value? Does anything else affect the Kw value?

Wayland Leung

If the ph or pOH is 7, is the solution considered neutral, neither acidic nor neutral?

Wayland Leung

A strong acid completely dissociates when put in water, where the H+ is ionized in the water. A weak acid does not completely ionize in water. Only a small amount of the molecule becomes aqueous in the water. Only a small amount of H+ is ionized.

Wayland Leung

How do you determine just by looking at a molecule that it is a weak base?

Wayland Leung

They represent the same thing. Normally we would just call it k. It is up to you to figure out if we are trying to find concentrations or pressure. But the equilibrium constant is the same in both cases.

Wayland Leung

what are the units for each variable? Are there different units for pressure? How do we convert them to atm?

Wayland Leung

Are elements isoelectronic if they have the same number of valence electrons but different structure?

Wayland Leung

I was wondering what the difference between molecular structure and the molecular shape.

Wayland Leung

Could someone explain why some elements do not need a full octet?

Wayland Leung

Will the values of electronegativity be given to us if we are asked to compare which elements are more electronegative or which are ionic and covalent bonds?

Wayland Leung

Mr. Andersen videos are very helpful. But Lavelle honestly has the best tools for you to study and succeed in his class. I would recommend doing all the homework problems and going to peer learning sessions to master the material.

Wayland Leung

What is the ground state electron configuration of Ga^3+?

Could someone please advise?

Wayland Leung

The ionization energy to remove the second electron of an atom will always be higher than the ionization energy to remove the first electron because the pull from the nucleus gets stronger and stronger as you begin to remove the electron shells.

Wayland Leung

The d-orbitals for Chromium and Copper are only half-filled and fully-filled. Instead of writing Chromium as [Ar]3d^44s^2, you would write the electron configuration as [Ar]3d^54s^1 to fill the d-orbital with five electrons rather than four. The same goes for copper, instead of 9 electrons in the d-...

Wayland Leung

How do we know if the wavelength is measurable? If the answer comes out to be a wavelength of 10^-24, is it measurable?

Wayland Leung

I was confused because I remember watching one of Dr. Lavelle's modules and him saying that large objects like baseballs and cars do not have wave-like properties. Only small masses with high velocities have wave-like properties. Could someone please clarify? How do you know if something has measura...

Wayland Leung

Due to the conservation of energy, the energy is not irrelevant and just disappear. It may heat up the metal or take another form. Energy is neither created or destroyed.

Wayland Leung

This is a good question as I was wondering the same thing. Based off the reading from the textbook, I can make an educated guess that he conducted an experiment about the photoelectric effect to come up with the constant value. He proposed in his experiment that energy travels in packets.

Wayland Leung

Also, when you are doing the problem, you should keep the number of sig figs the same throughout the work of the problem until you get an answer. Once you have your final answer, you may adjust it accordingly to the number of sig figs in the number specifically listed in the question.

Wayland Leung

It really all just depends on the problem and what it asks you to find. If the question is asking for the amount of product that can be prodced in grams, and you end up with moles of the product, you should multiply that amount by the molar mass to get the answer in terms of grams.

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