CHEMISTRY COMMUNITY

Maria Bajenov 1I

My TA said to understand the concept behind it but not draw it.

Maria Bajenov 1I

Number of moles affects the molarity of the reactant. Molarity is stated in the rate law. Depending on if moles increases of decreases, the molarity will be affected correspondingly.

Maria Bajenov 1I

Why can you say that all irreversible reactions are spontaneous? Wouldn't you need to do the calculation? How can this be true in general?

Maria Bajenov 1I

w= -PdeltaV takes into account that the external pressure is constant. It produces less work than a reversible reaction because for the reversible reaction, exceptions are made that allow the system to be viewed as not losing energy to other factors.

Maria Bajenov 1I

What determines if a heterogenous or homogenous catalyst should be used? What determines which is more effective?

Maria Bajenov 1I

How is Km a constant if it depends on concentrations of the enzyme and substrate?

Maria Bajenov 1I

When writing the rate law for each step of the mechanism, how do we know whether to include the reverse reaction? How do we know if it is too slow to effect the rate?

Maria Bajenov 1I

Since we haven't covered activation energy, do we always determine the slow step with the determined rate law? Is there any other method we have learned to determine the slow step?

Maria Bajenov 1I

How would you use units of the rate constant to identify order of the reaction? (What units of molarity and time raised to powers are associated with each order?)

Maria Bajenov 1I

Even though the overall reaction order is second, I believe the individual orders would both be first.

Maria Bajenov 1I

I think it means to only look at reactants at the start of the reaction (initial rate). Why does the reaction rate depend only on concentration of reactants, but the reaction rate can be set equal to products as well? How is it allowed to just focus on initial rate of reactants?

Maria Bajenov 1I

What is the difference between a galvanic and electrochemical cell? Or is galvanic a type of electrochemical cell?

Maria Bajenov 1I

Since a galvanic cell corresponds to a spontaneous reaction, is the left side of the cell diagram always the anode?

Maria Bajenov 1I

If it is not in standard state, the values of deltaH differ because the temperature it is carried out at is not the temperature at which deltaH was measured. Therefore, the problem must be done in parts, separating the different temperatures and then combining all the values from each separate calcu...

Maria Bajenov 1I

Is it only important to note whether a reaction is irreversible or reversible if the variable we are solving for is not a state function and dependent on the path? So an entropy calculation of an irreversible reaction can be found using the reversible calculation and be the same?

Maria Bajenov 1I

Since we go over derivations in lecture, is it necessary to know how to derive the equations we learn or simply how to use them?

Maria Bajenov 1I

I'm confused as to what you insert for qrev in delta S? Is it -delta H or nCdeltaT? How do you know when to use which?

Maria Bajenov 1I

In a given problem, how can you determine what is the system and what is the surroundings? When it states that a reaction occurs in the flask, how do you know that the surrounding is the flask, not the lab?

Maria Bajenov 1I

Can a reaction be determined as spontaneous or not only by delta G?

Maria Bajenov 1I

How can internal energy be a state function if work (a component of it) is not?

Maria Bajenov 1I

Can any system truly be isolated or adiabatic in practice or only in theory?

Maria Bajenov 1I

Does a reversible reaction always correspond to an isothermal system (because it is constant T) and an irreversible to an isobaric system (because constant P)? Or does P within the system change, and therefore, is it not isobaric?

Maria Bajenov 1I

When comparing U final and U initial to determine if ∆U is positive or negative, are there two different sets of values for q and w to calculate initial and final (since ∆U= q + w) or is it based on one set of data and then identified if final or initial was greater based on the value calculated?

Maria Bajenov 1I

It depends on the type of system the reaction is being carried out in. If the problem specifies that it is isothermal, use Cp. It it is being carried out in isochoric, use Cv. If it is isobaric, use Cp to calculate q because pressure is not changing and change in volume will be accounted for in calc...

Maria Bajenov 1I

For calculating ∆H, you solve for KJ(energy)/mol. The mol corresponds to n, but what constant corresponds to KJ?

Maria Bajenov 1I

Since the problem provides delta H and number of moles, there is a way to find delta U. It is possible to find delta T by the relationship between the C value that can be found in the table and the delta H value provided. Then solve for delta U by plugging in the values to the equation on page 280 (...

Maria Bajenov 1I

For measuring heat transfer, the equation q=(n)(Cp)(delta T) relates molar heat capacity at a constant pressure with moles. If one were to change, the other would change accordingly. The relation changes if it is at constant volume instead.

Maria Bajenov 1I

Is molar heat capacity a type of specific heat capacity since it is per amount?

CHEMISTRY COMMUNITY

Search found 28 matches

Re: Boltzmann Distributions

Re: number of mols effect on result

Re: Irreversible reactions

Re: Reversible vs Irreversible

Heterogenous vs homogenous

Km

Elementary Reaction Rate Law [ENDORSED]

Re: Limiting Step

Rate constant units

Re: Naming Orders

Re: Reaction Rate

Galvanic vs electrochemical [ENDORSED]

Galvanic cell set up

Re: Standard State

Entropy being a state function

Derivation

qrev

System vs Surrounding

Spontaneity

Internal energy as a state function

Systems in practice

Reversible vs Irreversible

∆U = U final-U initial

Re: When to use Cv or Cp? to calculate change in Entropy

∆H equation

Re: hw 8.49

Re: Different Molar Heat Capacities For Gases

Specific heat capacity vs molar heat capacity