CHEMISTRY COMMUNITY

ursulavictorino1K

How does surface area affect the voltage of a cell?

ursulavictorino1K

Does doubling the amount of reducer or oxidizer affect the voltage of a cell?

ursulavictorino1K

Does water affect the voltage of a cell?

ursulavictorino1K

When you say that standard reaction of formation is for an elements, does that encompass any state of matter?

ursulavictorino1K

So an aqueous solution isn't considered a liquid?

ursulavictorino1K

If they are always given as recutions, How do you know which to flip to an oxidizer?

ursulavictorino1K

So adding h2o, h3o+, and oh- balances the charge and elements or do you then have to add certain elements? Are you limited to just those 3?

ursulavictorino1K

How can you figure out the rate of formation of one element if you know the rate of absorption of another element?

ursulavictorino1K

Why is is that in the hw problems, the anode reaction is always flipped?

ursulavictorino1K

What factors affect the voltahe of a cell?

ursulavictorino1K

If 2 equations have R>P, how can tou tell which one is mote favorable to the right?

ursulavictorino1K

Is deltaG of ionization the same as regular deltaG?

ursulavictorino1K

What is the relationship between the equations deltaG=-RTlnK and deltaG= deltaH-TdeltaS?

ursulavictorino1K

What is the difference between Welland Eocell?

ursulavictorino1K

How do you differentiate between which equation is the oxidizer and which is the reducer when you are given 2 equations?

ursulavictorino1K

Why is it that the anode reaction is always reversed when determining the cell potential?

ursulavictorino1K

Given 2 reactions, how do you distinguish which is the oxidizer and which is the reducer?

ursulavictorino1K

How can you find the concentration of the anode or cathode given the concentration of the other? There was a question on the quiz which I did not understand how to solve that had this set up.

ursulavictorino1K

How do you balance a redox equation using h2o, h+, and oh-?

ursulavictorino1K

What is the difference between Ecell and Ecello?

ursulavictorino1K

Do we have to memorize certain coefficients for important instances?

ursulavictorino1K

Why does the reaction always go from the anode to the cathode?

ursulavictorino1K

What does it mean for them to be at their lowest energy states?

ursulavictorino1K

I was confused because in my notes u had pka=10^7 and pH=7 so I don't know if I miswrote it.

ursulavictorino1K

Is a base a proton acceptor or donor?

ursulavictorino1K

How do you determine the conjugate acid/base given one of them?

ursulavictorino1K

I'm still quite confused on how to go from pKa to pH like it was asked on one of the midterm questions. Could someone break it down?

ursulavictorino1K

What does it mean when half of the reaction is balanced?

ursulavictorino1K

What does it mean when the direction of flow goes from left to right?

ursulavictorino1K

Why does Gp have to equal Gr in order for the system to be in equilibrium?

ursulavictorino1K

Why do we ignore the deltaS/R when we are comparing T1 and T2?

ursulavictorino1K

What does it mean for qp=deltaH?

ursulavictorino1K

How are these coefficients calculated for the equation of Utot=(3/2)nRT?

ursulavictorino1K

Why is it that when deltaU=deltaH= negative, the reaction is favorable?

ursulavictorino1K

What does it mean if qp= deltaH?

ursulavictorino1K

What does it mean for a something to be an isothermal reversible expansion or irreversible free expansion?

ursulavictorino1K

Why is it that in the example from monday 1/27 lecture, qp=deltaH?

ursulavictorino1K

What is the difference between values of standard reaction enthalpy and standard enthalpy of formation?

ursulavictorino1K

Why does the heat supplied for phase changes between each state vary so much? Why does it take more heat to change from liquid to gas than any other phase change?

ursulavictorino1K

I still don't understand why steam burns are so strong. Why does it matter that it takes more kJ/mol to change the phase from liquid to gas?

ursulavictorino1K

In the example from Fri 1/17's lecture, the questions stated that the solution had KNO2(aq) but it is not directly used. Instead, the 0.150M of KNO2 were assigned to NO2-. Why is that? What is their relationship?

ursulavictorino1K

Why is it that a value of k<10^-3 means it is a weak acid?

ursulavictorino1K

If we are supposed to ignore solids and liquids when calculating K, why is it that in the example CaOH2(s) -> Ca2+(aq) + 2OH-(aq), we used the Ca2+ and OH-?

ursulavictorino1K

Why does decreasing H2 from the reaction cause NH3 to produce more H2? Wouldn't that just cause there to be a constant amount of H2?

ursulavictorino1K

Why is it that if Q<K, the forward reaction is favored if [R]>[P]?

ursulavictorino1K

What does it mean when it is stated at the end of a problem that the initial approximation is valid?

ursulavictorino1K

Do you have to use an ICE table to solve this? How would you calculate the initial M(molarity) of NH3?

ursulavictorino1K

Why does pressure affect concentration in that is causes the equilibrium to shift to the side which has the least moles?

ursulavictorino1K

To convert between Ka and pKa is it as simple as going from pKa=2.12 and Ka= 10^-2.12 since pKa=-log(Ka)?

ursulavictorino1K

How can you tell by looking at a chemical formula what is a strong/weak acid or base?

ursulavictorino1K

Why doesn't the reaction shift when the pressure is changed by an inert gas?

ursulavictorino1K

Why is it that if you increase N2 in the ammonia reaction, H2 will decrease?

ursulavictorino1K

Why is it that in order to increase the yield of NH3, you could remove NH3? Wouldn't that just decrease the amount of NH3?

ursulavictorino1K

What is the difference between the significance of K and Q if it is the same formula to find each value?

ursulavictorino1K

Why do we ignore the terms that are solids when calculating the eq. constat? Why does it not have an effect on the concentration?

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