CHEMISTRY COMMUNITY

Dina Geotas 4A

What is the change in enthalpy for part b?

Dina Geotas 4A

I cell diagram, what is the order you write the phases?

Dina Geotas 4A

Why do you not use an ICE table in question 4 of the midterm?

Dina Geotas 4A

You get the total order of the reaction by adding all the individual orders of the reaction!

Dina Geotas 4A

I don't think you need to memorize how to derive the equations, he just shows them to us to explain how we get from each formula to the next to help us comprehend!

Dina Geotas 4A

the slope of a first order reaction is negative, shown as "-k" in the equation. It forms a straight line plot of ln[R] vs. Time

Dina Geotas 4A

In the Nernst equation when do you use log vs. ln?

Dina Geotas 4A

When K is 0, <1, and >1, what is ∆G's sign??

Dina Geotas 4A

Is Electrolysis going to be on test 2? It's the section after Nernst so I wasn't sure since we aren't being tested on Nernst. Thanks!

Dina Geotas 4A

A reactant is both the reducing and oxidizing agent when it's used to form both products. For example, 2H2O2 -> 2H2O + O2

Dina Geotas 4A

Does the standard reaction potential change when you manipulate the half-reactions?

Dina Geotas 4A

When is maximum work done?

Dina Geotas 4A

When is entropy equal to 0?

Dina Geotas 4A

I'm still having trouble understanding what reversible means for a reaction? What are the different equations you use for a reversible or irreversible?

Dina Geotas 4A

When do you use Cp,m and Cv,m?

Dina Geotas 4A

When do you use Cp,m and Cv,m?

Dina Geotas 4A

What does Dr. Lavelle mean when he says to ignore thermal energy? How does this affect the system and finding entropy?

Dina Geotas 4A

How can you tell if a reaction is irreversible or reversible?

Dina Geotas 4A

What's the difference in equations for when a system has constant temperature or constant pressure?

Dina Geotas 4A

I had to skip around because a lot of the homework included subjects we haven't fully covered! Also, if you read through the textbook, you'll be able to understand the processes needed for the problems we haven't gone over in class!

Dina Geotas 4A

Enthalpy of reaction is first, and enthalpy of formation is second; Enthalpy of reaction is how much heat the reaction absorbs or gives off. Enthalpy of formation is how much heat a reaction absorbs or gives off when a compound is formed.

Dina Geotas 4A

What is the difference between and extensive and state property? Thank you!

Dina Geotas 4A

To find the Kb, you subtract 11.86 from 14 to get 2.14 as the pOH. From there you solve for the concentration of [OH] = .0072 mol/L, which is labeled x in the ice chart. Using the ice chart, you set up Kb, putting in .0072 as x. From this you can find Kb= 5.6x10^-4 and pKb=-log(Kb)= 3.25.

Dina Geotas 4A

Is there a formula that directly relations pH and Ka? or pOH and Kb?

Dina Geotas 4A

What are the sig fig rules for calculating pH and pOH? thank you!

Dina Geotas 4A

Can someone please explain the Conjugate Seesaw effect?

Dina Geotas 4A

How do you calculate the percent ionization of an acid?

Dina Geotas 4A

Why are we able to disregard the -x when calculating the Ka from an ICE chart?

Dina Geotas 4A

In order for the reaction to go back to equilibrium, the reactants will react towards products (forward reaction). For example, if in A\rightleftharpoons B where K= 7/2, the initial ratio (Q) is 0/9 (A=9 and B=0). In order to go back to equilibrium, A must react towards B until equilibrium is satisf...

Dina Geotas 4A

What factors can affect the equilibrium constant?

Dina Geotas 4A

What is the difference between K[p], K[eq], and K[p]? When do you use each and what are the units?

Dina Geotas 4A

What are the two factors that affect the acidity of an acid?

Dina Geotas 4A

What exactly is an ion-dipole interaction and can you give an example?

Dina Geotas 4A

What is the difference between polarizability and polarizing power?

Dina Geotas 4A

Why does the pKa of an acid increase as the acidity decreases?

Dina Geotas 4A

I think we need to know both because they go hand in hand! pOH = 14 - pH!

Dina Geotas 4A

Would a molecule with a central atom able to have an expanded octet that currently has a lone pair and room to accept another pair be considered amphoteric?

Dina Geotas 4A

What happens if the 2 Carbons do rotate?

Dina Geotas 4A

When writing AXE of the structure, what determines the numbers following X and E?

Dina Geotas 4A

I don't think the placement of the d-orbital matters when writing the hybridization!

Dina Geotas 4A

I know that lone pairs influence the shape of the molecule, but do they also influence the name of the shape?

Dina Geotas 4A

NF4 would be polar due to the lone pair of electrons around the central atom, N.

Dina Geotas 4A

Lone pairs of a molecules make the structure of a molecule distorted because the lone pairs repulsions are stronger than the repulsions between bond pair repulsions. This makes the angles between the atoms slightly smaller!

Dina Geotas 4A

Polydentate Ligands contain multiple bonding atoms bonded to the central metal atom or ion.

Dina Geotas 4A

To find the electron density, you add up all the bonding and unshared electron pairs that are around the central atom after drawing the lewis structure, counting double and triple bonds as one region high electron density.

Dina Geotas 4A

2E.1. Below are ball-and-stick models of two molecules. in each case, indicate whether there must be, may be or cannot be one or more lone pairs of electrons on the central atom.
Part A shows a trigonal planar ball-and-stick model with 120˙ and Im not sure what the answer would be! Thank you!

Dina Geotas 4A

You can find the formal charge by using the formula:
Formal Charge = valence electrons- (number of electrons in lone pairs + 0.5(bonding electrons))

Dina Geotas 4A

What is the difference between a Lewis Base and a Lewis Acid? Which accepts a proton and which donates a proton?

Dina Geotas 4A

How do you find planar and radial nodes?

Dina Geotas 4A

The ionic radii size increases down a group and decreases across a period!

Dina Geotas 4A

It's measured in picometers, or pm!

Dina Geotas 4A

What is degeneracy?

Dina Geotas 4A

How can you determine if ms is +1/2 and -1/2?

Dina Geotas 4A

Zeff is the effective nuclear charge of an electron. It can be calculated with Zeff= Z-S where Z is the number of protons in the nucleus and S is the electron density between the nucleus and electron. It increases going to the right and down on the periodic table.

Dina Geotas 4A

Electrostatic attraction is the repulsion or attraction between two particles due to their charges and distance between these two charges. This can be found by using Coulomb's Law: (q1 x q2)/(r^2) where q1 and q2 represent the two charges and r represents the distance between charges.

Dina Geotas 4A

Since nitrogen has the electron configuration of 1s^2 2s^2 2p^3, its orbitals are half filled, resulting in a stable condition. Oxygen has the electron configuration of 1s^2 2s^2 2p^4, which means it has two half filled orbitals and one orbital filled with two paired electrons. Since the atoms want ...

Dina Geotas 4A

Which specific characteristics of electrons distinguish if it is acting as a wave or particle?

Dina Geotas 4A

What wavelength values are measurable? For example, why is 1.64 x 10^-38 m not measurable?

Dina Geotas 4A

Molarity is the moles of solute divided by the liters of the solution. You can use it during dilution calculations!

Dina Geotas 4A

Do the zeros implied in scientific notation count as significant figures?

Dina Geotas 4A

Yes I think you just use Avogadro's number to find the number of atoms or molecules!

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