CHEMISTRY COMMUNITY

Ryan Neis 2L

Can a nonspontaneous reaction do work?

Ryan Neis 2L

When solving for this problem why is the answer book says to utilize the form ln(k'/k), but why is k' on the numerator when it is normally depicted as being place on the denominator, such as K=k/k' ?

Ryan Neis 2L

What the equations and rules for delta s, w, and q are associated with reversible processes? And what are the ones associated with irreversible processes?

Ryan Neis 2L

When the number of moles of gas are the same for both the reactants and products side of a chemical equation and each species has the same amount of molecules, how can you determine whether or not the delta S of the reaction will be positive or negative?

Ryan Neis 2L

What are the properties of irreversible expansion? reversible expansion?

Ryan Neis 2L

What are the units for zero, first, and second-order reactions?

Ryan Neis 2L

Does activation energy play a role in determining whether or not a reaction is controlled through kinetics or thermodynamics? If so, how?

Ryan Neis 2L

For this portion of the problem, I solved for the rate constant by plugging in the values into the rate law and converting from mmol to mol at the very end, however doing so gave me a completely different answer. So I tried converting all the values from mmol to mol before plugging them into the rat...

Ryan Neis 2L

How do you know that a reactant's concentration is independent of the rate (such as [C])? Is it because the initial rate is the same in both experiments 1 and 4?

Ryan Neis 2L

How can you determine whether or not you need to use a regular rate law equation versus an integrated rate law equation when given certain values?

Ryan Neis 2L

In this problem in the textbook part c asks for the "unique rate of the reaction"? Is that just another way of asking what the overall rate of the reaction would be (aka the slowest rate)?

Ryan Neis 2L

For this problem, given the reaction Cl2(g) + H2(g) --> HCL(aq), how do you know which species will be in the cathode and which will be in the anode seeing as neither of Cl's and H's oxidation numbers change?

Ryan Neis 2L

For this problem how do you know which species will go on the reactants side when writing the half-reaction for the cathode and anode? Because in the answer book it shows that O2 appears on the reactant side for both, but how can you decipher where it goes?

Ryan Neis 2L

When solving for this problem how do you find n? Are you supposed to calculate it based on individual oxidation numbers or from the overall charges on either sides of the equations?

Ryan Neis 2L

No, multiplying a half-reaction by a factor does not affect the Standard Cell Potential value

Ryan Neis 2L

Visually, at the cathode, since the metal ions are being reduced, there will be an increase in the solid metal, that's how you know that the solid metal at the cathode is a product, and the metal ions are the reactants. In the anode, the opposite process occurs making the metal ions at the anode the...

Ryan Neis 2L

The reaction that is being reduced usually has the higher, more positive voltage, while the reaction that is being oxidized has the lower, more negative voltage

Ryan Neis 2L

In nature, are things more commonly reduced or oxidized? or is it an equal occurrence?

Ryan Neis 2L

When an oxidation of an element increases is it oxidized or reduced?

Ryan Neis 2L

What does the large/small cell potential tell us?

Ryan Neis 2L

How does temperature, pressure, and volume differ with reversible and irreversible reactions/pathways?

Ryan Neis 2L

Why does a negative delta s value correspond to a spontaneous process?

Ryan Neis 2L

I'm having a hard time trying to conceptually understand when reactions are considered spontaneous, can anyone clarify?

Ryan Neis 2L

I'm having trouble with conceptually understanding what degeneracy is

Ryan Neis 2L

What is the difference between a closed system and an isolated system?

Ryan Neis 2L

In preparation of the test, do we need to solve an integral in order to calculate the work of a system?

Ryan Neis 2L

How can you change the energy of a system?

Ryan Neis 2L

What is the most accurate method of calculating enthalpy change of a reaction?

Ryan Neis 2L

What is the difference between heat and temperature?

Ryan Neis 2L

What is the conceptual difference between delta h and delta u?

Ryan Neis 2L

Why does temperature stay constant during a phase change?

Ryan Neis 2L

What is the main difference between intensive properties and extensive properties?

Ryan Neis 2L

What do the Ka and the pKa values tell us? Is there a conceptual difference or is it purely just mathematical differences?

Ryan Neis 2L

What constitutes a neutralization reaction? Is there any specific characteristics that classify a reaction as a neutralization reaction?

Ryan Neis 2L

What are the general properties of amphiprotic compounds?

Ryan Neis 2L

What are the general properties of amphoteric compounds?

Ryan Neis 2L

Does a small value for K favor reactants? or products? Why?

Ryan Neis 2L

Does anyone know up to which VSEPR shapes would we need to know by memory? And does anyone have a good method to help remember those shapes?

Ryan Neis 2L

Why does a triple bond contain only one sigma bond, yet two pi bonds?

Ryan Neis 2L

In terms of labeling based on electron density, why do we call a molecule with 6 e- densities an octahedral?

Ryan Neis 2L

Can a molecule's overall polarity be different from the polarity of its bonds? If so, how can you tell if they are different?

Ryan Neis 2L

When solving for resonance structures, is there any way of knowing how many resonance structures a molecule has? Or are we supposed to find as many as possible?

Ryan Neis 2L

The types of bonds that elements have is dependent on the other element it is bonding with. For instance, two nonmetals have a covalent bond while a non mental bonded with a metal has an ionic bond.

Ryan Neis 2L

Can someone clarify why there are certain exceptions to the rules of electron configuration when dealing with elements such as Copper and Chromium?

Ryan Neis 2L

The spin of the electron typically doesn't matter unless you are given a problem with the ms value. And depending on whether or not the ms value is +1/2 or -1/2 will determine the spin of the electron. For instance, if ms=+1/2 then it spins upwards (counterclockwise) and if ms=-1/2 it spins downward...

Ryan Neis 2L

When determining the best structure of a molecule why does the formal charge have to be 0?

Ryan Neis 2L

Why does the trend of ionization energy decrease going down a group and increase going across a period?

Ryan Neis 2L

I'm just confused as to what this equation exactly tells us? What does it mean when it says it finds the height of a wave at position x, y, z?

Ryan Neis 2L

I know that the energy of a photon has to be greater than the energy to remove an electron in order for light to be absorbed, but what happens when the energies are equal to each other? Is there a difference in outcome or in the values of the velocity of the electron?

Ryan Neis 2L

Can someone clarify what it means conceptually when energy is quantized?

Ryan Neis 2L

When problems, such as Question 1.7 (b), ask for an answer in specific units (in this case wavelength in picometers) will we have to memorize the various numbers needed to convert to different types of units, such as micro-, nano-, giga-, mega-, etc., or will that information be provided for us in t...

Ryan Neis 2L

I remember in my TA Discussion that when working on a math problem you want to keep the numbers as long as possible until you reach the final answer value, and it's that final value where you apply the rules of significant figures so that the answer is the most accurate.

Ryan Neis 2L

For questions when we are given the name of a compound, how can we write a chemical formula for it without the molecular formula of the compound being given?

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