CHEMISTRY COMMUNITY

Mahir_Hasan2C

Basically, you multiply the instantaneous rate to the inverse stoichiometric coefficient.

Mahir_Hasan2C

You would first compare the rate laws for different experiments. You would solve for the exponents as you would cancel out like terms. In terms of C you would compare trials 1 and 4 and then you would see through the comparison it would be 7/4 to the nth power = 1. Therefore n is equal to 0.

Mahir_Hasan2C

It will still be second order since each reactant is first order.

Mahir_Hasan2C

Why is it that you are allowed to exclude one of the species when finding the order of that species?

Mahir_Hasan2C

How do you know which reaction is fast or slow?

Mahir_Hasan2C

In class, Dr. Lavelle mentioned dimerization. What is this?

Mahir_Hasan2C

You just flip the sign.

Mahir_Hasan2C

It depends on where the electrons are. The Au3+ will have electrons to reduce down to Au+, while Au+ will reduce to Au. The electrons will cancel to make the original equation.

Mahir_Hasan2C

E naught means it is in standard conditions.

Mahir_Hasan2C

You would add the potential difference of the two half-reactions, keeping in mind that you may flip one-half reaction to cancel out the electrons.

Mahir_Hasan2C

We would typically use electrodes like platinum if species aren't a conducting metal. For example, H2+Cl2=>HCl, we would use platinum electrodes because both hydrogen and chlorine are nonmetals.

Mahir_Hasan2C

In the back of the book, there is a table full of potential difference for reactions. I would use that to determine what reactions took place. Then balance it to find the potential difference.

Mahir_Hasan2C

Do gases have a - delta G value because they are typically spontaneous?

Mahir_Hasan2C

How does G relate to a reaction being spontaneous?

Mahir_Hasan2C

Why is delta G equal to 0 at constant temperature and pressure?

Mahir_Hasan2C

If it states ideal gas, then yes it is safe to assume.

Mahir_Hasan2C

Since it is an ideal condition, it is implied that it is 1 mole.

Mahir_Hasan2C

When temperature increases it is implied there is a change in temperature. The formula only accounts for constant temperature. Therefore we can't use the equation for a change in temperature. We would need the equation of nCln(t2/t1) for the change of temperature.

Mahir_Hasan2C

Forming a bond is exothermic and breaking a bond is endothermic.

Mahir_Hasan2C

From last quarter, there weren't any solutions for tests. However it could be possible it be on Lavelle's webpage.

Mahir_Hasan2C

The SI unit is atm, but bar unit is more accurate. You could use J/L to find energy.

Mahir_Hasan2C

Is the reason for diatomic molecules enthalpy being 0 because that is the average for all the diatomic molecules or is it a different reason?

Mahir_Hasan2C

What is the SI unit for pressure?

Mahir_Hasan2C

How are we able to tell if an expansion is irreversible or not?

Mahir_Hasan2C

If we were to look at the example of whether NH3 is a base, it would be easier to rely on the Lewis structure. We see that NH3 has a lone pair, this can make a bond with one of the Hydrogens of water and create a hydroxide concentration. All in all, when in doubt make the lewis dot structure.

Mahir_Hasan2C

We can tell if it donates or accepts a proton by the manner it dissociates. For example, if we were given the salt NH3Cl we would decide this is a base due to the fact that its reaction with water would produce a hydroxide concentration. I find it easier to tell if you add water to it and see whethe...

Mahir_Hasan2C

You wouldn't include chlorine since it would act as a spectator ion. Also HCl is a strong acid that dissociates completely so really you're solving for H+.

Mahir_Hasan2C

I think it is due on our discussion.

Mahir_Hasan2C

You first convert every mmol to mol. This would be used to find concentration as it is Qc. Then, divide each by .5L because you are finding molarity. Then you make your ratio of products over reactants. You would get [SO3]^2/([SO2]^2[O2]). You input all your values and that is your answer.

Mahir_Hasan2C

It's much easier cause x can be anything thus it is used to define the change in molarity. It also makes things easier in the algebraic sense. Then we put whatever coefficient in front of x to display the conservation of matter. For example, if 1 reactant produced 2 product we would have -x and +2x ...

Mahir_Hasan2C

If we talking about DeBroigles wavelength, it is because velocity and wavelength are inversely proportionate. A bigger wavelength means smaller speed while a smaller wavelength means bigger speed. If we are talking about the wavelength in reference to light, the speed is always the same since it is ...

Mahir_Hasan2C

Due to the fact it has a higher molar mass it is a bigger molecule, thus it requires more energy.

Mahir_Hasan2C

It's a bronsted base because it accepts a proton.

Mahir_Hasan2C

It doesn't really matter as the implication is the same yet it depends on the location. You would want the lewis dot structure to agree with the model. For example you would typically put the line to Oxygen of H2O since Oxygen is able to be bonded.

Mahir_Hasan2C

Typically ionization energy decreases as you go down the and increases as you go right. This is true for electron affinity.

Mahir_Hasan2C

It would if you consider Carbon for example that it changed from sp3 to sp2 when it is double bonded. It is dependent on the number of bonding regions.

Mahir_Hasan2C

Bonds don't affect the shape, they just affect the rotation.

Mahir_Hasan2C

That is because C has 3 bonding regions so it is sp2 and since there is a triple bond it is a sigma bond with 2 bonds.

Mahir_Hasan2C

Whenever there is a single bond, it is just a sigma bond. Whenever it is a double bond, there is a sigma bond and a double bond. Whenever it is a triple bond, there is a sigma bond with 2 pi bonds.

Mahir_Hasan2C

What is electron promotion and how can we tell if electron promotion took place?

Mahir_Hasan2C

They are all negative because it is taking energy from the system to form bonds. This takes away energy thus a negative energy.

Mahir_Hasan2C

I think we are supposed to say the VSEPR model per atom. For example C2H4, both labels would be trigonal planar. If it was C2H3O-, then we would label the C's as C1 and C2. C1 would be trigonal planar while C2 would be tetrahedral.

Mahir_Hasan2C

I think he was referring to the strength of the bonding. In terms of strength they are relatively similar.

Mahir_Hasan2C

It means the distance would affect the strength of the energy. Since r is to the 6th power it makes energy very dependable to distance.

Mahir_Hasan2C

I think it is possible but we would have to check the formal charge and if the number of electrons matches with the chemical formula.

Mahir_Hasan2C

We use the electron configuration. We would adjust this due to the charge. Then we draw the spins of the electrons.

Mahir_Hasan2C

I'm pretty sure the difficulty is the same or if not it is testing us on the concepts.

Mahir_Hasan2C

It is more stable to be in 3d10 in comparison to 3d9 as it is closer to the full shell.

Mahir_Hasan2C

The formal charge is what you use to find the lowest energy in terms of resonant structures. The formal charge closest to 0 is often lowest energy. The best example can be seen in pg. 83.

Mahir_Hasan2C

It just means that it is at it's most stable state.

Mahir_Hasan2C

In the previous question, as in b, we found the threshold energy. What we currently have is the threshold energy, the mass of the electron (which is implied when it states electron), the velocity of the electron (which we converted to m/s). With the mass and velocity of the electron, we can find the...

Mahir_Hasan2C

In the book (6th edition) it says the equation is momentum*postion=h/2pi. I thought it was over 4 pi. Is this a typo or is it really over 2pi,

Mahir_Hasan2C

Did they state velocity of the electron? If so you would use the equation h/mv=wavelength. M is the mass of electron.

Mahir_Hasan2C

The first step is to convert it to m/s. Then you would use the equation lambda (wavelength) = h/(mass of the electron*velocity). This would give your answer.

Mahir_Hasan2C

I remember Lavelle saying that he won't take off too many points if you don't have the right significant figures. That implies he'll give partial credit.

Mahir_Hasan2C

If you are asking what is the variable that is the speed of light that would be c which is 3E8. If you asking the formula it would be c= wavelength(meters) times frequency in Hz.

Mahir_Hasan2C

It shouldn't affect the constants since they are typically rounded off. Typically, significant figures are for the shortest amount of digits.

Mahir_Hasan2C

Since it says hepta in front of hydrate, where I believe in Greek hepta means 7, we put 7 in front of H20.

Mahir_Hasan2C

When finding the molar mass of a compound you don't need the coefficient because you add the masses of all atoms in the compound. If you are talking about finding grams or the mass, you would then need the coefficient for the mole to mole ratio.

Mahir_Hasan2C

Normally there would be a limiting reactant. However, if there was the case you just described, it would be interchangeable since it none of the reactants would limit each other.

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