CHEMISTRY COMMUNITY

Vanessa Romero-Campos 2B

Can someone clarify when its necessary to add an electrode (like Pt) to a cell?

Vanessa Romero-Campos 2B

NVM!! I wasn't thinking. I understand

Vanessa Romero-Campos 2B

Can anyone explain how they got the change in temperature in part B?

Vanessa Romero-Campos 2B

Will we be responsible for naming organic molecules? What parts of organic chemistry will we be responsible for?

Vanessa Romero-Campos 2B

Do discussion sections meet this week?

Vanessa Romero-Campos 2B

will we have to know how to derive integrated rate laws for this weeks test?

Vanessa Romero-Campos 2B

why does increasing the concentration of reactants cause the rate to increase but it doesn't affect the rate constant ?

Vanessa Romero-Campos 2B

Can someone explain how to figure out the rate law of the reaction when you are given a+b+c--> products and a chart of experiments. How do you know what experiments to look at and how do you use them?

Vanessa Romero-Campos 2B

Can someone explain why -d[NO2]/dt=d[NO]/dt=2 d[O2]/dt
I'm confused about the 2 before the d[O2]/dt

Vanessa Romero-Campos 2B

What is the ideal place to take the tangent line from then? How do you decide where to take the tangent line from?

Vanessa Romero-Campos 2B

When we're trying to determine the rate of a reaction and want to draw a line tangent to the curve would it matter where we take the tangent line from (at the beginning, end or middle of the curve)?

Vanessa Romero-Campos 2B

Is there a relationship between Kinetics and Thermodynamics? If something is kinetically stable, is it thermodynamically unstable, stable or is there no relationship between both?

Vanessa Romero-Campos 2B

When balancing redox reactions and we have to add water to the reaction does it matter where water is added (product or reactants side)? I was reading the text posted on the class website and it says: "Because there are four oxygen atoms in MnO4- that are not present in the final Mn2+ form, we ...

Vanessa Romero-Campos 2B

Does anyone know what exactly is going to be on the second test this week? Will any specific topics be excluded?

Vanessa Romero-Campos 2B

Is there a way to tell whether we should balance an equation under acidic conditions as opposed to basic conditions, without it being explicitly stated in the directions?

Vanessa Romero-Campos 2B

a)Cl2 + S2O3(-2) --->Cl (-1) + SO4 (-2)

I am trying to balance the reaction and so far I have Cl2+2e-->2Cl- and S2O3(-2)+5H2O---> 2SO4 (-2) + 10H+
How do I finish balancing: S2O3(-2) + 5H2O---> 2SO4 (-2) + 10H+

Vanessa Romero-Campos 2B

When we are calculating Gibbs free energy, do we have to convert partial pressures given in bar to atm? Does it matter?

Vanessa Romero-Campos 2B

I know we were going to discuss free energy on Friday, but what else did Lavelle go over? I wasn't able to attend lecture and am trying to catch up and watch videos on the subject if anyone can please give me details on what i should review I'd appreciate it.

Vanessa Romero-Campos 2B

How would I explain which molecule HBr or HF has a higher molar entropy? I know Br is heavier (higher atomic weight) than Fluorine but how do I connect that idea to this question? Is there any actual calculations that I can do to figure this out?

Vanessa Romero-Campos 2B

Would we have to accurately draw the molecule with wedges and dashes to depict the 3D structure of the molecule or would it not matter?

Vanessa Romero-Campos 2B

When solving problems for changes in entropy when given pressure values, would we need to show the derivation of the entropy equation for changes in pressure before solving the problem or would it suffice to explain that I used delta S=n*R*ln(p1/p2) because of the relationship between pressure and v...

Vanessa Romero-Campos 2B

During the test of an internal combustion engine,3.00 L of nitrogen gas at 18.5 degrees Celsius was compressed suddenly and irreversibly to 0.500 L by driving in a piston. in the process, the temperature of the gas increased to 28.1 degrees celsius. Assume ideal behavior. what is the change in entro...

Vanessa Romero-Campos 2B

In class we compared the equilibrium of entropy and the equilibrium in entropy, where in entropy equilibrium was hit at a minimum value while in entropy it was reached at a maximum value. My notes are incomplete and I was wondering what the point of this comparison was.

Vanessa Romero-Campos 2B

In class, we went over an example that talked about a piston moving out and the energy of the system decreasing by an amount. The first diagram showed the formula F=P*A and the second showed that V=A*d. Why is it that the volume is the area times displacement of the piston? Why does it only take int...

Vanessa Romero-Campos 2B

Will we be docked points for incorrect significant figures on quizzes and exams?

Vanessa Romero-Campos 2B

Can someone explain why work on air is positive when an air bicycle pump is compressed .
I thought work is positive if work is done by the system, and negative if work is done on the system. Wouldn't work be done on air, so it'd be negative?

Vanessa Romero-Campos 2B

Complete the reaction mechanism.(Given an HI and CH2CH2 structure) Is there any way to tell how many steps it takes to complete a reaction mechanism? In this instance, one of the double bonds goes to the Hydrogen in HI and the single bond on HI goes to Iodine. From there, how do I determine what to ...

Vanessa Romero-Campos 2B

When drawing the structure of CH2F2 how do you determine what element is going to be represented by a wedged bond (black triangle looking bond) and a dashed line as opposed to solid lines? Does it matter what molecule in the structure is assigned these bonds? For example, rather than the hydrogens h...

Vanessa Romero-Campos 2B

Can someone explain why a reaction with very low activation energy has a rate that does not change much with temperature.

Vanessa Romero-Campos 2B

How do you determine which elements are undergoing changes in oxidation states?

Ex: H(+) + Cr2O7 (2-) + C2H5OH ----> Cr(3+) + C2H4O +H20

I know that Cr is one of the elements, but how is Carbon also undergoing changes?

Vanessa Romero-Campos 2B

#3 If 2 mols of an ideal gas at 300 degrees K and 3 atm expands isothermally and reversibly from 6 to 18 L and has a final pressure of 1.2 atm what is its w, q, and delta U? To find the work I used -n*R*T*ln(v2/v1) and plugged in the values as follows =-2*8.206 *300*ln(18/6) =5409.127 L*atm and to c...

Vanessa Romero-Campos 2B

Ohh okay, Thank you :)

Vanessa Romero-Campos 2B

a)calculate the heat that must be supplied to a 500.0 g copper kettle containing 400.0 g of water to raise its temperature from 22.0 degrees Celsius to 100degrees celsius. I used the equation q=(m)*(Cs)*(delta T) and plugged in the given information as follows: (400g)*(4.184 J/C*g)*(100-22) and got ...

Vanessa Romero-Campos 2B

When naming coordination compounds how is it that we get the roman numeral after the cation name? How do we identify it?
For example if we are given [Co(NH3)5Cl]Cl. 2H20 the name for this compound is Penta Ammine Chloro Cobalt(II) Chloride dihydrate. How is it that we get (II) after cobalt?

Vanessa Romero-Campos 2B

An example in the course reader asks to find K. It states: Mix .500 mol*L -1 N 2 with .800 mol*L -1 H 2 . Also given at equilibrium there's .150 mol*L -1 NH 3 . What's K. The balanced equation is 1 mole N 2 + 3 mole H 2 <--> 2 mole NH 3 The chart looks like this: N 2 H 2 NH 3 Initial Molar concentra...

Vanessa Romero-Campos 2B

I know that if when computing the bond order we get
0:the molecule won't form
1: means a single bond
2: means a double bond
3: means a triple bond
but what happens when we get fractions of a number such as 2.5? What kind of bond is formed then?

Vanessa Romero-Campos 2B

Give the ground-state electron configuration and number of unpaired electrons expected for Ag+

I understand that the configuration is [Kr]4d10, but I don't understand why it's not Palladium which is also 4d10. They're both similar. Is either one correct or why is it not Palladium?

Vanessa Romero-Campos 2B

For each orbital listed in 2.21 (6p, 3d, 2p, 5f), give the possible values of the magnetic quantum number.

Vanessa Romero-Campos 2B

The question states: A chemist studying the properties of photographic emulsions needed to prepare 500.0 mL of 0.179 M AgN03 (aq). What mass of Silver Nitrate must be placed into a 500.0-mL volumetric flask, dissolved, and diluted to the mark with water? I know I have to find the mass of AgNO3, but ...

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