CHEMISTRY COMMUNITY

Carlos Gonzales 1H

For the equation with 2 temperatures, does it matter which temperature is t1 and t2?

Carlos Gonzales 1H

Why is delta U a state function if it depends on q and w, which are not state functions?

Carlos Gonzales 1H

K can equal k1/k'1, but can it also equal k2/k'2? Is it just convention as to which step is the rate determining step?

Carlos Gonzales 1H

Will the Arrhenius equation containing 2 different temperatures be included in the final equation sheet? Or will there only be the equation with 1 temperature?

Carlos Gonzales 1H

Yes that is the correct answer

Carlos Gonzales 1H

For today's review session, one example given was 14.47. In the solution manual the answer to this problem for part a is Q=10^6, but when calculating for Q, I got the answer to be 3.3x10^6. Is this an error in the manual or is the number so big that the 3.3 is insignificant?

Carlos Gonzales 1H

In the solution manual, it states that one of the intermediates is a chloride ion. I was wondering how the chloride ion gets removed if the other reaction only shows a neutral chlorine atom.

Carlos Gonzales 1H

0.034 is the concentration in terms of B. You have the initial concentration in terms of A so you must convert [B] to [A] using the stoichiometric coefficients.

Carlos Gonzales 1H

Why is the slope of a second order reaction positive compared to first and zero order reactions?

Carlos Gonzales 1H

Is it always necessary to use water to balance the redox reactions?

Carlos Gonzales 1H

It was stated that the overall reaction order is the sum of n and m, but what are the orders of "n" and "m" called?

Carlos Gonzales 1H

For the general rate law, will the reactants always have a negative sign in front of them? Is this simply because the reactants are being decomposed?

Carlos Gonzales 1H

When balancing reactions under basic conditions, do we just need to add OH- rather than H+?

Carlos Gonzales 1H

In lecture it was stated that there will not be calculations regarding electrolysis, but we should at least know the conceptual information.

Carlos Gonzales 1H

As mentioned above, both equations are the same except for the fact that one uses base e and the other uses base 10. The equation with base 10 is more typically used because pH is based on a log base 10 scale.

Carlos Gonzales 1H

Bansi Amin 1D wrote:What is meant by constant measures?

If there are equal measures or dimensions, then the volume has to be the same. Isochoric and isometric can be used interchangeably.

Carlos Gonzales 1H

In the equation that you mentioned, the pressure can be used in any units because they will cancel out as they are being divided.

Carlos Gonzales 1H

During the midterm review, it was stated that $\Delta S_s_y_s=-\Delta S_s_u_r_r$ when Delta S total is 0. Could someone explain how it can be zero and what the significance is?

Carlos Gonzales 1H

During lecture, Dr. Lavelle mentioned that Van't Hoff used a different equation than the one we are more likely going to use. Why exactly did he use a different equation and what for?

Carlos Gonzales 1H

Could someone explain what the significance of wmax=deltaG is? Why is is important that maximum work is equal to deltaG? Thanks

Carlos Gonzales 1H

For the Van't Hoff equation, are we always going to assume that entropy and enthalpy will remain constant?

Carlos Gonzales 1H

What is the significance of W being a maximum at equilibrium for an isolated system?

Carlos Gonzales 1H

How does positional entropy differ from thermal entropy?

Carlos Gonzales 1H

Could someone please explain a little more why enthalpy of reaction has a bigger role at lower T? Thanks.

Carlos Gonzales 1H

If a problem requires enthalpies, they will be provided. I do not believe you have to memorize any of them.

Carlos Gonzales 1H

When q is positive, heat has been absorbed by the system. When q is negative, the system has lost heat. If the system requires 5.5 kJ of heat that means that for the system to work it will have to absorb 5.5 kJ of heat. This means that q in this case will be positive.

Carlos Gonzales 1H

In a test if we are asked to solve for the enthalpy of a reaction will we be given a chart with the enthalpies for the different bonds?

Carlos Gonzales 1H

Example 8.5 in the textbook shows that for the reversible and irreversible pathways q and w have the same values, but the signs are different. Does this apply for all problem where only the sign is different in q and w?

Carlos Gonzales 1H

Will we need to memorize any specific heat capacities of materials or will we be given the information as needed?

Carlos Gonzales 1H

One of the equations we are given for work is w=-PexΔV, where external pressure is constant. Will the pressure always be constant or are there instances where the pressure will be different?

Carlos Gonzales 1H

[Xe] would be accepted unless stated that the written out electron configuration is wanted.

Carlos Gonzales 1H

After balancing and finding the total moles on the reactants and the products side, the net number of moles will be the moles on the products side - the moles on the reactants side.

Carlos Gonzales 1H

How do we know if a certain acid has more than one Ka? Is it based solely on the available H available to donate?

Carlos Gonzales 1H

The K value of the reverse reaction will be the reciprocal of the forward reaction, so the reverse reaction will be 1/K.

Carlos Gonzales 1H

The unit we use for temperature in this equation is Kelvin (K). If the temperature is given in Celsius, add 273.15 to convert to Kelvin.

Carlos Gonzales 1H

R represents the ideal gas constant, which depends on the units of measurements of the other variables.

Carlos Gonzales 1H

If the Carbon were to have a double bond with both chlorine and nitrogen then the formal charge of carbon would be 0, but the formal charges of chlorine and nitrogen would be +1 and -1, respectively. When making lewis structures we want to have the formal charges to be as close to 0 as possible. Whe...

Carlos Gonzales 1H

Think of the molecule as a spinning top. The center of the spinner is the central atom and the tip of the spinner along with the tip the touches the floor are the "axial atoms". The rest of the atoms can be thought of as the "body of the spinner" which are the equatorial atoms

Carlos Gonzales 1H

Yes the bond angles will need to be known, there are certain patterns with the models so they should come easy if you practice with homework problems and review the notes.

Carlos Gonzales 1H

In the deBroglie equation, we have a constant (Planck's) and momentum. So we would use the equation when we know the mass and velocity of a particle.

Carlos Gonzales 1H

During lecture, we were told that we would not necessarily have to draw the 3D VSEPR models. We would most likely have to write down the molecular geometry of the compound.

Carlos Gonzales 1H

The trend in the periodic table is if you go from left to right, the ionization energy increases. Beryllium is on the left of the periodic table (alkali earth metals) and chlorine is on the right of the periodic table (halogens). Therefore, chlorine has higher ionization energy.

Carlos Gonzales 1H

If we are asked to make a lewis structure of a substance, should we include the resonance structures as well? Or would that only be necessary if initially asked?

Carlos Gonzales 1H

When writing lewis dot diagrams does it matter on what direction of the symbol we start putting the dots for the valence electrons?

Carlos Gonzales 1H

I believe you would be given the mass also, typically the mass of a subatomic particle is given as kilograms in the DeBroglie equation

Carlos Gonzales 1H

When we write electron configurations, do we have to write the atomic orbitals separately or can we write the configuration as just a certain subshell?

Carlos Gonzales 1H

Up to this point in the class I believe that yes only DeBroglie equation requires us to use a prefix like kilo-

Carlos Gonzales 1H

During lecture, the Balmer and Lyman series were mentioned. These are just two series, and I've heard of the Paschen series, but are there more hydrogen series and if so would they be necessary to learn? Thanks

Carlos Gonzales 1H

Oh I see, so if I come up with a number that has, say 7 digits, I'd go to maybe 4 for the rest of the calculations and then at the end go to 3 significant figures?

Carlos Gonzales 1H

Let's say that in a question you are given a value with 3 significant figures. Would you have to go to 3 significant figures after every calculation? Or would you round at the very end of all the calculations?

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