CHEMISTRY COMMUNITY

Guadalupe T 1E

I know that in a bomb calorimeter deltaV= 0 is pressure also 0?

Guadalupe T 1E

Are there instances when you can only use cathode-anode or any when you can only flip the value? Or can we always use either?

Guadalupe T 1E

Open. The way I remember it is, if it is open, it can be knocked over and matter can leave it.

Guadalupe T 1E

Will we only have to identify the examples given in class or is there more?

Guadalupe T 1E

No they are all on the constants sheet.

Guadalupe T 1E

If you were given three graphs and were asked what order it is, you'd have to look at the one with a straight line to tell.

Guadalupe T 1E

How do we find the reaction rate/law using method of initial rates vs for more than one reactant? What is the difference?

Guadalupe T 1E

I believe it is because you won't always know how much product will be made.

Guadalupe T 1E

Yes because you won't always know how much product is made.

Guadalupe T 1E

Is T always equal to 1/2 or what does it depend on?

Guadalupe T 1E

Since the anode and the cathode on the cell diagram can be switched (i.e cathode on the left & anode on the right) does that also apply to the equation that represents it?

Guadalupe T 1E

I know when products/reactants are favored in terms of K>1 etc, but what are the rules when Q>K or Q<K?

Guadalupe T 1E

Are Q and K interchangeable?

Guadalupe T 1E

You can also use the equation deltaS= n x delta H / T when there is vaporization/ fusion and deltaS= nCpln(T2/T1) for phase changes.

Guadalupe T 1E

What does the Kb stand for/ what is its purpose?

Guadalupe T 1E

Nope but it is helpful in case we need to manipulate one to get another.

Guadalupe T 1E

The problem usually states when there is constant pressure/volume

Guadalupe T 1E

You can also use "OIL RIG"
Oxidation Is Losing (e-)
Reduction Is Gaining (e-)

Guadalupe T 1E

I know what they are used for, but how do they work?

Guadalupe T 1E

When you have constant volume and you have to use the equation: change in S=nRln(v2/v1) the R(8.314) has to be multiplied by 3/2.

Guadalupe T 1E

Since adiabatic means that no heat is transferred, and enthalpy is the study of heat released or absorbed, does that mean that they are not related at all?

Guadalupe T 1E

The question will usually state that it is at constant volume or constant pressure.

Guadalupe T 1E

Is there a difference between reaction enthalpies and the three methods?

Guadalupe T 1E

Yes to both questions. You will need to manipulate the other reactants/products in order to get to the original equation.

Guadalupe T 1E

Josh Moy 1H wrote:will all the equations be on a formula sheet?

Yes. The formula sheet is separate and has many other different formulas we won't need for this test but for future ones too.

Guadalupe T 1E

The way I understand it is that specific heat is to change the temperature of the substance by 1 degrees and specific heat capacity is to change 1 gram of the substance by 1 degrees.

Guadalupe T 1E

Are both matter and energy taken into account to identify open/closed/isolated systems?

Guadalupe T 1E

I know we use three methods, but what exactly are they used for? What are we trying to find?

Guadalupe T 1E

What exactly does Cp=5/2*R and Cv= 3/2*R mean? When would we use it?

Guadalupe T 1E

I was told we should know that Br2, and Hg are liquid, H2, N2, O2, F2, I2, and Cl2 are gases and their standard enthalpy of formation is 0. Besides the ones I named, any other ones should be given to us.

Guadalupe T 1E

On Friday Lavelle went over three methods. If I understood right, he provided examples for the the 2nd and 3rd, but I am not sure how to use the first. Can someone explain how or when we'd use standard reaction enthalpy?

Guadalupe T 1E

We might be asked to identify the lewis base/acid in a compound that has ligands. The metal is always the lewis acid and the ligand is always the lewis base.

Guadalupe T 1E

Clarissa Molina 1C wrote:Can somebody explain the 5% rule when approximating x please? Is K being less than 10^-3 enough to be able to approximate or does it also have to follow the 5% rule?

It was mentioned that 10^-3 should be enough to use approximation but you can be asked to prove that it follows the 5% rule.

Guadalupe T 1E

Dr Lavelle mentioned that you can use partial pressure in ice boxes, so you do not have to convert unless it asks.

Guadalupe T 1E

When given the wavelength in nm, how do we convert it to m?

Guadalupe T 1E

No I believe this topic will be covered in 14B.

Guadalupe T 1E

If you increase the products of a reaction, which way will the reaction shift?

Guadalupe T 1E

How are dipole moments and polarity related to each other?

Guadalupe T 1E

When there are problems where we have to use ice boxes, are the acids and bases automatically weak?

Guadalupe T 1E

Can you use partial pressure in ice boxes or does it have to be in concentration?

Guadalupe T 1E

What are the trends we have gone over in class? I know for sure there is atomic size and electronegativity.

Guadalupe T 1E

I have a hard time identifying what is what in wordy questions. For instance I often mix up what is the Molarity, number of moles of solute, or the volume. And I have a hard time with excluding unnecessary givens in the equation. Does anyone have any advice? Molarity is moles/Liters and is sometime...

Guadalupe T 1E

pH is for acids and pOH are for bases, so I guess you can say they are opposites. If you have one you should always be able to find the other.

Guadalupe T 1E

Can someone please explain how an element can be a proton donor or acceptor or how to identify one? I am having trouble understanding this concept.

Guadalupe T 1E

I am having trouble understanding the how something is a lewis base/acid. I know that a Lewis base is an electron pair donor and a Lewis acid accepts an electron pair. How do they "donate" or "accept" electrons?

Guadalupe T 1E

I have a question regarding this, do we use the ideal gas law to convert between the partial pressure and concentration?

Guadalupe T 1E

Yes, it depends on what the question is asking for, concentration of partial pressure.

Guadalupe T 1E

so are partial pressure and concentrations two different things?

Guadalupe T 1E

In lecture, the first example Lavelle went over for finding K was about a reaction that had gases but he went on to explain partial pressure. My question is, when asked for equilibrium for a reaction of gases is it in partial pressure or does it depend on what is being asked?

Guadalupe T 1E

When doing the VSEPR formula I know how to find AX_n but how would you identify E or the subscript for it?

Guadalupe T 1E

Is regional planar the same as angular? The solutions manual says it is angular, I'm confused.

Guadalupe T 1E

For a) the alphabetical letter for l=1 is p. Also the quantum/group number is given (4) So it is 4p. The most # of electrons 4p can have is six. For c, the group number is given 2. The most number of electrons that group 2 can have is 8. (2s2 4p6) 2+6=8 I am not sure how to find the others because i...

Guadalupe T 1E

I was told that all we really need to know is that Ψ is the wave property of an electron.

Guadalupe T 1E

I am having trouble understanding how the lobes of Px,y,z orient along their respective axes. Are the axes similar to x & y axis of a graph? If so, where would the axis Pz be?

Guadalupe T 1E

Is there a specific orientation for the quantum numbesr in m sub l?

Guadalupe T 1E

I have a question regarding the response to the question. Are velocity and the light constant the same? Because I know that c= wavelength x frequency. I did not know that wavelength x frequency=velocity?

Guadalupe T 1E

In the Limiting Reactants module, Dr Lavelle mentioned how to get to the theoretical yield but there was no example on how to. I am not quite sure how to find it. If someone could show me with an example I would greatly appreciate it. Thanks!

Guadalupe T 1E

You do not have to do M1xV1=M2V2 because the question is asking for molarity and not dilution. You still can but it will take you longer.

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