CHEMISTRY COMMUNITY

Cecilia Jardon 1I

zero order is only dependent on the rate constant correct?

Cecilia Jardon 1I

Oh I see what you mean. Just what happens to the negative?

Cecilia Jardon 1I

the equation C2H4(g) + 3O2(g)--> 2CO2(g) + 2H2O(g) and unique rate of reaction = 0.44 mol L^-1 s^-1 is given it asks to find the rate at which O2 reacts. The solutions manual says to multiply 0.44 mol L^-1 s^-1(3) which gives you 1.3 mol L^-1 s^-1. I thought that for a unique average rate the equati...

Cecilia Jardon 1I

If you are give initial rate in an experiment in mmol/L x s then you would have to convert the moles to x10^-3 mol in order to get your final units in moles correct?

Cecilia Jardon 1I

S2O8 ^-2 + 3I- --> 2SO4^2- + I3- Rate of consumption of S2O8^2- = k [S2O8^2-] [I-] The book says that doubling either the S2O8 ^2- ion concentration or the I- ion concentration doubles the reaction rate. I am confused as to what exactly the reaction rate is. Is it k? or is it the whole reaction: Rat...

Cecilia Jardon 1I

In the equation (k/k') = K(eq. constant). Is the K (eq. constant) the same K as used in an acid/base rxn?

Cecilia Jardon 1I

Since rate does not depend on the concentration of the reactant in a zero order rxn then would it be safe to assume that there is no rate law for a zero order rxn?

Cecilia Jardon 1I

In lecture, Lavelle mentioned how unimolecularity exists in an A--> P reaction. I was not able to catch when he said how does one reactant collide with itself. Can someone explain please.

Cecilia Jardon 1I

I think that this video helps to explain the galvanic cell with the salt bridge https://www.youtube.com/watch?v=7b34XYgADlM .

Cecilia Jardon 1I

It says to write the half-reaction for Cl2(g) +H2(g)--> HCL (aq)
i thought that it would be for the
reduction: 2H+ (aq) + Cl2(g) + 2e- --> HCl(aq)
but on the solution manual it says that the answer is Cl2(g) + 2e- --> 2Cl-
Why is that? Can someone explain this please.

Cecilia Jardon 1I

Hi, I am not sure exactly when to use Pt as the electrode. Can anybody please explain and give an example?

Cecilia Jardon 1I

What exactly is a galvanic cell? is that different from a voltaic cell?

Cecilia Jardon 1I

The typical ones of group one are +1 and group 2 are +2. the halogens are -1 and oxygen is -2.

Cecilia Jardon 1I

Just to be clear, there are two ways to calculate e nuaght of the cell?
Its E naught of the cell= e naught of the cathode - e naught of the anode and the other one is using the reduction potentials?

Cecilia Jardon 1I

In lecture on Friday in the notes it said if G(r) does not equal G(p) then the system (rxn) is not at equilibrium. Can someone explain why that is?

Cecilia Jardon 1I

A state property is one where the start and the end of the function only matter rather than the path taken.

Cecilia Jardon 1I

Is Delta G a state function since it is additive?

Cecilia Jardon 1I

Standard Gibbs Free Energy is under standard conditions compared to that of gibbs free energy?

Cecilia Jardon 1I

Can someone please help with the question.
If an isolated system contained +100kJ of energy after 100 years what is delta U?

Cecilia Jardon 1I

When work is done on its surrounding that means work is done by the system, therefore, it is negative right?

Cecilia Jardon 1I

What are the correct units for enthalpy?

Cecilia Jardon 1I

This equation is just saying that the heat that is released by the system is equal to the negative amount of heat absorbed by the surroundings.

Cecilia Jardon 1I

Just to make sure the cooling curve would just be starting from the end of the heating curve and then going down?

Cecilia Jardon 1I

I do not think you have to go so detailed on the heating curve. As long as your temperatures match up with when it freezes and heats. I provided a link with a heating curve which I think is a pretty good example. Hope it helps! https://s3-us-west-2.amazonaws.com/courses-images/wp-content/uploads/sit...

Cecilia Jardon 1I

Essentially he was saying that you require more energy to break a double bonded carbon atom (c=c) vs a single bonded atom (c-c). And that energy is required to break a bond and that to form bond energy is released.

Cecilia Jardon 1I

For Hess's Law do you essentially just manipulate both equations to get the equation that you need and then add both enthalpies?

Cecilia Jardon 1I

Can someone explain how to do number 4b on worksheet 1. I do not seem to understand the steps to take. The Haber process is used to synthesize ammonia gas (NH ) from nitrogen gas ( ) 3 N2 and hydrogen gas ( H ). A system at equilibrium contains 1.85M H2 1.36M N2 and 2.91 x 10 ^−3 NH3 at a constant t...

Cecilia Jardon 1I

Just to clarify, Q is the same chemical reaction but just in the state where it has not yet reached equilibrium?

Cecilia Jardon 1I

If the equilibrium constant can only be affected by temperature how would it change? Like if the temperature increased would the equilibrium constant increase/ decrease. Or is that something we are not supposed to know?

Cecilia Jardon 1I

What will happen when an inert gas is introduced into a chemical equilibrium?

Cecilia Jardon 1I

Thanks! :)

Cecilia Jardon 1I

Is Q just the calculation of a reaction that has not yet reached equilibrium?

Cecilia Jardon 1I

I just wanted to make sure that the units for temperature in this equation is supposed to be in Kelvin?

Cecilia Jardon 1I

5G.3 Write the expression for K for each of the following reaction. 4NH(3) + 6NO --> 7N(2) + 6H(2)O <-- I was checking if the equation was balanced and saw that nitrogen was not. But in the solution manual it has the expression of K using these coefficients. Answer: K= (P N2) ^7 (PH2O)^6/ (PNH3)^4 (...

Cecilia Jardon 1I

A careless laboratory technician wants to prepare 200.0 ml of a 0.0025 M HCl (aq) solution but uses a volumetric flask of volume 250.0 mL by mistake. What will be the actual pH of the solution. On the solutions manual it says that the answer is -log(200.00ml x 0.0025 M/ 250.0) which equals 1.7. I do...

Cecilia Jardon 1I

Is myoglobin hexadentate? because I know that the porphyrin is tetradentate but then when the iron atom binds with the histidine and that oxygen would that make it hexadentate?

Cecilia Jardon 1I

Oh okay, thank you so then if oxygen were not bound then it would be square pyramidal?

Cecilia Jardon 1I

Oh okay, thank you so then if oxygen were not bound then it would be square pyramidal?

Cecilia Jardon 1I

I was wondering what would the shape of myoglobin be? I was thinking that it would be octahedral since it has 6 regions of electron densities. Is that right?

Cecilia Jardon 1I

The question asks to write the formula for potassium hexacyanidochromate(III). The answer is K3[Cr(CN)6]
I don't understand how potassium got to have the subscript 3. Can someone explain please.

Cecilia Jardon 1I

Would an ionic molecule have London-dispersion forces?

Cecilia Jardon 1I

What type of intermolecular forces would be stronger? An ion-ion or an H-bond and why?

Cecilia Jardon 1I

To obtain the hybridization of a large molecule like caffeine for example, C8H10N4O2, you just look at the central atoms right?

Cecilia Jardon 1I

Just to make sure, a pi bond consists of a sigma and pi bond?

Cecilia Jardon 1I

Hi, can anyone help me understand 2F.15 from the 7th Edition. Question: Noting that the bond angle of a sp^3 hybridized atom is 109.5 degrees and that of an sp^2 hybridized atom is 120 degrees, do you expect the bond angle between two hybrid orbitals to increases or decrease as the s-character of th...

Cecilia Jardon 1I

This is a T-shaped molecular geometry but it has a an arrangement of electron density of trigonal bipyramidal. The bond angles are <180 degrees and <90 degress. With a hybridization of sp^3d.

Cecilia Jardon 1I

Hi, I just wanted to make sure that a double bond or a triple bond counts as one electron cloud right?

Cecilia Jardon 1I

They also have less than 90 degrees bond angles. :)

Cecilia Jardon 1I

Thank You! That helps a lot !

Cecilia Jardon 1I

2E5. What is the shape of a ClO2+ ion? b) what is the expected OClO bond angle?
Can someone help me with this problem? I do not understand how this ion is trigonal planar.

Cecilia Jardon 1I

Are hydrogen bonds a type of dipole-dipole bonds? And what are the atoms that it can bond with?

Cecilia Jardon 1I

I usually put the remaining valence electrons, that are left after using the ones from bonding the elements, around the most electronegative atoms (which are the elements on the outside) and if there are electrons that are still remaining I will put them on the least electronegative element (the one...

Cecilia Jardon 1I

Can someone please explain the difference between Polarizability and Polarizing Power. I did not quite understand the difference between each two.

Cecilia Jardon 1I

I believe that the bond angle degree will always remain the same with the VSEPR model that it corresponds with because. For example,http://images.tutorcircle.com/cms/images/44/vsepr-model-chart.png has an image of the many compounds that have the same molecular shape that corresponds to a certain de...

Cecilia Jardon 1I

In Sodium Hypochlorite does the pre-fix hypo signify an oxygen atom?

Cecilia Jardon 1I

In an x-ray photoelectron experiment, chromium metal is irradiated with light of wavelength 9.020x10 ^-11 m
b) How does KE of the e- change as x-ray intensity is increased?
c) Calculate the wavelength of the ejected electron.
Can you please explain both.

Cecilia Jardon 1I

How many degenerate 3p orbitals exist? Can someone explain with detail and an example?

Cecilia Jardon 1I

For this question, I used the kinetic energy formula to calculate the velocity of the electron and got 6.626 x 10 ^-25 m/s. And then used the wavelength = h/mv to find the wavelength of the electron. I plugged in the given and got wavelength= (6.626 x 10^-34 Js) /((9.1095x 10 ^31 kg) (6.626 x 10 ^-2...

Cecilia Jardon 1I

That makes sense it just increases by 1. So then the nodal planes is related to the shape of the orbital?

Cecilia Jardon 1I

How many nodal planes would an f- orbital have? Can someone explain it with details?

Cecilia Jardon 1I

m subscript (l) has the name magnetic. It specifies the orbitals of the shells and indicates the orientation.

Cecilia Jardon 1I

From what I understood, it is about 2 specific concepts 1) Magnitude of the charge 2) distance b/w them q1 : charge 1 and q2: charge 2 and r is the distance b/w the charges.

Cecilia Jardon 1I

Can someone remind me of when a certain delta v answer u is not possible to have? I just remember that it had something to do with comparing it to the speed of light constant.

Cecilia Jardon 1I

I understand how the inner electrons shield the outer electrons from the electrostatic attraction of the nucleus because they are in front of the outer electrons. But what exactly is the electrostatic attraction?

Cecilia Jardon 1I

Can someone help me understand the meaning behind m subscript s again? I know that one of m subscript s is +1/2 and -1/2.

Cecilia Jardon 1I

Can someone help me understand the meaning behind m subscript s again? I know that one of m subscript s is +1/2 and -1/2.

Cecilia Jardon 1I

I was having trouble understanding what diffraction patterns were. The professor mentioned constructive (waves in phase) and destructive interference (waves out of phase). Are were supposed to know how to draw those or just understand the concept of them. And if so can you please explain.

Cecilia Jardon 1I

Worked Example: If you are driving a 1.50 x 10 ^(3) car at 27.0 m(s^-1). What is the De Broglie wavelength of your car? Does your car have any measurable wavelength properties? wavelength= h/p = -h/mv = (6.626 x 10 ^ (-34) J(s)) / ( 1.50 X 10 ^3 kg) (27.0 m(s^-1)) = 1.64 x 10 ^ (-38) m In the lectur...

Cecilia Jardon 1I

The reason why the energy becomes positive is that when an electron releases energy it releases a photon of electromagnetic energy which is positive. So when something is absorbed it is positive. That is because due to the law of conservation of energy, energy can not be destroyed. Hopefully, that m...

Cecilia Jardon 1I

@Jovian thank you! :)

Cecilia Jardon 1I

Actually I saw what I did it was a calculator mistake.

Cecilia Jardon 1I

Thank You. I did the problem the way that you guys told me but I seem to be getting a different answer. I got 1.73 x 10 ^38.
This is what I did.
1.0 mol Ag x (6.0221x10^23 / 1 mol Ag) x (288 pm /1 atom) x (1m/ 10 ^-12 pm) = 1.73 x10 ^38 m.

Cecilia Jardon 1I

Hey guys, I was wondering if anyone could please explain how to do E1. I was having trouble understanding how to start off. Is there a certain equation that needs to be used? E1: The field of the technology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose y...

Cecilia Jardon 1I

Hi, I am confused about the readings that we need to do for class since there is not a topic for each week in the syllabus. For example, would the Review of Chemical and Physical Principles fundamentals be for Monday's lecture week 1?

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