CHEMISTRY COMMUNITY

Rachel N 1I

Should the overall n = 12, not 6?

Rachel N 1I

The following redox couple forms a galvanic cell which generates a current under standard conditions

H⁺ / H₂ and Ni²⁺/Ni

a) Identify the oxidizing agent
b) Identify the reducing agent

What method is used to solve this problem?

Rachel N 1I

Do we have to include the phases when writing the overall reaction of a mechanism?

Rachel N 1I

I believe the question will tell you to when to use a salt bridge or porous disk.

Rachel N 1I

The E value of a concentration cell should always be 0, under standard conditions, because the concentration of the anode and cathode is equal.

Rachel N 1I

Is it possible for K to ever be zero?

Rachel N 1I

I highly doubt that we would be asked to find anything higher than the 3rd order. But we may be asked questions where the overall order is greater than 3.

Rachel N 1I

Why is the contents of an ideal cooler at 3 deg Celsius considered isolated and not closed?

Rachel N 1I

Yes, heat transfer does happens because they system is doing work and losing energy. This energy is replaced by heat flow, q, into the system.

Rachel N 1I

So for Test #1 Question 3a:

Propane is burned in the presence in the oxygen inside a sealed bomb calorimeter in contact with a heat bath and the pressure increases inside the calorimeter from 1 atmosphere to 1.5 atmospheres.

How would you justify that there is no work being done?

Rachel N 1I

The rate of C2 gas consumption in this reaction is constant throughout and is given as 0.250 M/s. If your reaction vessel starts with 0.35M of ABC, how long will it take to get to 24.00M of ABC?

How would you solve this problem?

Rachel N 1I

During the Friday review session, it was mentioned that problems covering ochem topics should be relatively easy points since Lavelle only briefly went over the ochem topics!

Rachel N 1I

viewtopic.php?f=160&t=29688&p=93510&hilit=red+panda&sid=5b2b150b70e9e7a54d494c988abe448f#p93510

Rachel N 1I

Are bomb calorimeters considered vacuums?

Rachel N 1I

Can someone explain the concept of transition state? And is it always the peak of a free energy profile graph?

Rachel N 1I

How did you determine that there are no catalysts?

Rachel N 1I

When drawing a cell diagram, do we use a double vertical line for both the porous disk and salt bridge?

Rachel N 1I

What's the correct answer for a and b?

Rachel N 1I

Yes it is

Rachel N 1I

I am also confused about bimolecular nucleophile substitution. Can someone explain it?

Rachel N 1I

Would we need to know how to identify SN2 reactions for the final?

Rachel N 1I

Consider the following mechanism:

STEP 1 (FAST): 2A + B --> C
STEP 2 (SLOW): C + D --> 2E

a) Identify the intermediates and catalysts.

How do you identify what the catalysts are?

Rachel N 1I

So is A affected by temperature or nearly independent of it?

Rachel N 1I

So the strongest reducing agent would have the greatest oxidizing power. Does that mean that the reducing agent with the greatest oxidizing power would have the most negative E?

Rachel N 1I

15.65 For the reversible, one-step reaction 2 A ---> B + C, the forward rate constant for the formation of B is 265 L/(mol*min) and the rate constant for the reverse reaction is 392 L/(mol*min). The activation energy for the forward reaction is 39.7 kJ mol 1 and that of the reverse reaction is 25.4 ...

Rachel N 1I

Rank the following in order of increasing oxidizing power:

a) Mn, Ag, Ti

b) Pb, Al, Cu

When it asks for increasing oxidizing power, does it mean to find the oxidizing agent or the reducing agent?

Rachel N 1I

Also my TA mentioned during discussion that we would not be tested on steady state approximation. Can anyone else confirm that?

Rachel N 1I

I am still a little fuzzy on the concept of pre-equilibrium condition. Can someone please explain?

Rachel N 1I

So all we need to know about functional groups is being able to recognize and name them?

Rachel N 1I

So all we need to know about functional groups is being able to recognize and name them?

Rachel N 1I

Why is the w=0? To maintain a constant pressure, wouldn't you need a volume change, thus work is being done?

Rachel N 1I

For delta H, do label the units as KJ or KJ/mol?

Rachel N 1I

Can someone explain the difference between intensive and extensive property?

Rachel N 1I

Steam burns a lot more because the enthalpy of condensation is high. The heating curve for water shows that as water goes through a phase stage into gas, it is dumping a large amount of energy at 100 deg Celsius of heat onto the skin.

Rachel N 1I

Is it valid to also look for O- when trying to identify what -dentate a ligand is?

Rachel N 1I

Does the alphabetical order of the ligand matter when writing the chemical formula of a compound?

Rachel N 1I

The greater the bond strength the shorter the bond length. As there are more electrons, the pull force is greater which makes it stronger. For example a single bond has 2 electrons which gives it a weak bond strength and a long bong length. On the other hand, a triple bond has 6 electrons which give...

Rachel N 1I

There are also multiple exceptions to the octet rule including boron and aluminum

Rachel N 1I

Yes, I also agree with Miranda. You can't eject electrons by increasing the intensity of the radiation because in order to eject the electron.

Rachel N 1I

The series of the wavelengths given will help you find the final energy level. Since this is a Balmer series, you already know that n1 =2, and by counting the numbers, you can see that n2 =7. So using the equation E = -hR/n^2 you can find the energy of both n1=2 and n2=2. Finally, you can use Ef - E...

Rachel N 1I

@804899546 Yes, you would still list the d-orbital before the s-orbital in chromium and copper since technically the s orbital was already filled with 2 electrons before the d orbital, making the d orbital now lower in energy. In the case of chromium, we are moving one electron from the s-orbital in...

Rachel N 1I

@Humza_Khan_3F I believe that the three quantum numbers: principal (n), angular momentum (l), and magnetic (m) together describe the size, shape, and orientation in space of an orbital of an atom. So the orbital is not simply the l value, it is made up by n,l,and m.

Rachel N 1I

Yes, the Lyman and Balmer series are specifically used to find the change in energy levels of hydrogen atoms.

Rachel N 1I

You will get a negative energy because as it moves from n=5 to n=1, it loses energy. But remember that wavelength and frequency will always be positive!

Rachel N 1I

@Helen
In order to get the work energy, 150.6 kJ/mol must be converted to Joules (1000 kJ= 1J) and then multiplied to Avogadro's number, 6.022 x 10^23, as a conversion factor to cancel out the mol in the denominator.

Rachel N 1I

I was reading through one of the examples in the textbook about Balmer and Lyman series and it stated that because n1=2, the wavelength should match one of the lines in the Balmer series. How are you able to tell which region of the spectrum indicates which series to use? Also why is n1=2 Balmer ser...

Rachel N 1I

You can also think of this as a ratio. For one astatine atom there are 3 gallium atoms. Since there are 9 gallium atoms 9/3=3, there would be 3 astatine atoms.

Rachel N 1I

It can be easier to make a list of all the elements on both sides of the equation and simply continue to add coefficients to the equation until the elements on both sides are equal.

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