CHEMISTRY COMMUNITY

Alison Trinh 1E

How do you find the oxidation numbers of elements to balance redox reactions?

Alison Trinh 1E

When given cell notation, how can you tell which is the anode or the cathode?

Alison Trinh 1E

How are isolated systems exposed to constant external pressures?

Alison Trinh 1E

Why is it that closed systems prevent volume changes?

Alison Trinh 1E

What is the difference between specific heat capacity and molar heat capacity?

Alison Trinh 1E

What is the Arrhenius Theory and how can we use it to model a reaction?

Alison Trinh 1E

What does having a straight line when plotting data tell us?

Alison Trinh 1E

What does it mean when we say the rate of a reaction depends on the reaction mechanism?

Alison Trinh 1E

What kind of information do we obtain from integrated rate laws?

Alison Trinh 1E

What is the purpose of using the Arrhenius equation?

Alison Trinh 1E

Why do we focus on [R] when finding initial rates rather than [P] ?

Alison Trinh 1E

n represents the order of the reactant, which in turn gives insight into the mechanism of the reaction.

Alison Trinh 1E

What does it mean when a reaction is first order?

Alison Trinh 1E

How does comparing initial reaction rates help us with determining the forward and reverse reaction rates?

Alison Trinh 1E

What is the biggest factor that we should take into account when trying to determine whether thermodynamics or kinetics controls a certain reaction?

Alison Trinh 1E

a salt bridge allows ion transfer

Alison Trinh 1E

It helps us calculate the K at different temperatures (if we know the standard DeltaH)

Alison Trinh 1E

Is it when the standard reduction potential is a positive or negative value that a reduction is spontaneous?

Alison Trinh 1E

What is a "half reaction"?

Alison Trinh 1E

If DeltaG is less than 0 at a certain composition of the reaction mixture, then the forward reaction is spontaneous. If DeltaG is greater than 0 at a certain composition of the reaction mixture then the reverse reaction is spontaneous.

Alison Trinh 1E

Is there a difference between residual and positional entropy?

Alison Trinh 1E

What does each variable in this equation represent?

Alison Trinh 1E

A visual my TA provided regarding irreversible expansion would be if you had a piston with some external pressure acting on it and also some weight in the form of sand holding down on the piston. Irreversible expansion would be taking out the sand grain by grain until there is no more sand and thus ...

Alison Trinh 1E

What does isochoric mean?

Alison Trinh 1E

How can you tell a process is reversible or irreversible without having a visual/picture?

Alison Trinh 1E

Why do we need to compare the values of Q and K?

Alison Trinh 1E

What is the difference between an extensive property and an intensive property?

Alison Trinh 1E

Why do we need to use the concept of Gibbs Free Energy?

Alison Trinh 1E

What makes positional/residual entropy different from entropy in general?

Alison Trinh 1E

What is DeltaH and how do we use it in relation to thermodynamics?

Alison Trinh 1E

Can someone clarify how the universe can be identified as a closed system?

Alison Trinh 1E

What does ∆U represent in an equation?

Alison Trinh 1E

What are the differences between the first, second, and third laws with regards to using them in equations?

Alison Trinh 1E

Can someone summarize the piston example that was discussed in lecture?

Alison Trinh 1E

Can someone explain the isolated system drawing Dr. Lavelle drew in lecture? What does the cloud-like drawing surrounding the flask represent?

Alison Trinh 1E

Positive enthalpies are equivalent to endothermic reactions that take up heat. Enthalpies can be expressed as negative when a reaction is exothermic and therefore releases heat and warms the surroundings.

Alison Trinh 1E

Why is it necessary to know all three methods?

Alison Trinh 1E

What does DeltaH represent?

Alison Trinh 1E

When do we use Hess's Law?

Alison Trinh 1E

Can someone define state property for me please? Thank you.

Alison Trinh 1E

To anyone who has the Sapling Learning supplement, what are your thoughts on it and how has it helped you?

Alison Trinh 1E

Can we determine whether an acid or base is weak or strong by calculating their concentrations?

Alison Trinh 1E

When/why do we use the quadratic equation in terms of chemical equilibrium?

Alison Trinh 1E

What would you say are the best ways to practice for the test?

Alison Trinh 1E

When would we use this equation in relation to chemical equilibrium?

Alison Trinh 1E

What is the purpose of an ICE Box?

Alison Trinh 1E

What is an ICE table?

Alison Trinh 1E

Why do we not use units for concentration?

Alison Trinh 1E

What exactly is partial pressure and how does it relate to chemical equilibrium?

Alison Trinh 1E

What is the purpose of finding Q? Is it just to determine the direction of the reaction?

Alison Trinh 1E

In the textbook, it discusses the law of mass action and how it relates to equilibrium, but I can't seem to grasp the idea. Could someone clarify what the law is and how it relates to chemical equilibrium?

Alison Trinh 1E

I have also found that Khan Academy is good for review and studying.

Alison Trinh 1E

I have heard that if you receive 250 points out of the 500 you should be able to pass the class with a C-

Alison Trinh 1E

The marshmallow review session and going over old tests would be a good way to review since there was no practice final.

Alison Trinh 1E

Using the Marshmallow and Dino Nuggets review problems have also been helpful for me.

Alison Trinh 1E

How can you tell whether an acid is strong or weak? Would you consider relative acidity to do so?

Alison Trinh 1E

What exactly is the conjugate seesaw and why is it important?

Alison Trinh 1E

In what ways are ligands relevant to the topic of acids and bases?

Alison Trinh 1E

Why is it that the resulting anion after a strong acid easily loses an H+ must be stable?

Alison Trinh 1E

An acid is considered a Lewis acid if an electron pair can be accepted. A Lewis base would be considered an electron pair donor.

Alison Trinh 1E

To further elaborate, Bronsted acids are considered proton donors. It is a Lewis acid if an electron pair is accepted. A Bronsted base is considered a proton receptor. A Lewis base is considered an electron pair donor.

Alison Trinh 1E

What is the purpose of neutralization?

Alison Trinh 1E

What exactly does the suffix "-dentate" refer to?

Alison Trinh 1E

What does a coordination compound refer to and why are they necessary?

Alison Trinh 1E

Can someone clarify what a conjugate acid or conjugate base is exactly?

Alison Trinh 1E

Also, to add on to the previous comment, the central atom should be a central metal atom.

Alison Trinh 1E

Can someone explain what exactly a ligand is?

Alison Trinh 1E

What causes a molecule to have a different molecular shape than another molecule with the same molecular formula such as in the case of pentane and 2, 2 dimethylpropane?

Alison Trinh 1E

My TA said hydrogen bonding would appear on Test 2. Could someone explain to me or give me and example of how this could appear on the test? Like what kind of problem should we expect on this topic?

Alison Trinh 1E

What is the difference between a VSEPR Model and a Lewis Structure?

Alison Trinh 1E

Which homework outlines should we be focusing on in preparation for Test 2?

Alison Trinh 1E

Could someone please provide a list of what we should expect to be on Test 2? Thank you!

Alison Trinh 1E

Just to clarify, differences in characteristics such as boiling point of two different molecules that have the same molecular formula can be attributed to their different shapes?

Alison Trinh 1E

What is the difference between polarizability and polarizing power?

Alison Trinh 1E

What exactly is a dispersion force?

Alison Trinh 1E

Can someone clarify what "instantaneous dipole moment" means/refers to?

Alison Trinh 1E

What is the difference between interionic forces and intermolecular attractive forces?

Alison Trinh 1E

What is the importance/significance of knowing the quantum numbers of orbitals?

Alison Trinh 1E

If the electronegativity difference is between 1.5 and 2 then it is a mix of the two bonds.

Alison Trinh 1E

The element with the lowest ionization energy or the element with the least electronegativity is the central atom.

Alison Trinh 1E

I believe you can either draw all of the possible structures or draw the "actual structure", which is a hybrid of a molecule's resonance structures.

Alison Trinh 1E

It is also helpful to keep in mind that electronegativity increases as it gets closer to Flourine on the periodic table.

Alison Trinh 1E

Yes, that is the session I am referring to @Rebecca! Thank you so much!

Alison Trinh 1E

Is the midterm review session at 6 today also cancelled? Thank you!

Alison Trinh 1E

Can lone pairs become bonds?

Alison Trinh 1E

Covalent bonds form between nonmetals whereas ionic bonds are formed when electrons transfer from metal to nonmetal. This is because nonmetals don't form cations and therefore share electrons to form covalent bonds.

Alison Trinh 1E

The octet rule refers to the covalent bonds that atoms share until a noble gas configuration is reached.

Alison Trinh 1E

Resonance is a blending of structures with the same atom arrangement but different electron arrangements.

Alison Trinh 1E

There should be a total number of 8 valence electrons (think octet rule).

Alison Trinh 1E

What does each variable in the Schrodinger equation shown above represent?

Alison Trinh 1E

What additional factors effect electron energy in multi-electron atoms?

Alison Trinh 1E

How does the Schrodinger equation apply to orbitals?

Alison Trinh 1E

Rewatching Dr. Lavelle's video modules, doing the homework/practice problems, and attending step-up sessions have been very helpful for me in terms of studying and trying to really understand the material!

Alison Trinh 1E

Just to clarify, why are s, p, d, and f orbitals categorized like this? Is it because of their differences in their nodal planes, number of orbitals, energy levels, etc.? Thank you!

Alison Trinh 1E

Frequency and energy are directly proportional in that when frequency increases so does the kinetic energy. This causes electrons to be ejected.

Alison Trinh 1E

Also, it was mentioned during lecture that electrons must have wavelike properties because they give rise to a diffraction pattern that result from interacting waves.

Alison Trinh 1E

The reason the cutoff is 10^-15m is simply because that is because wavelength properties that are anything less than that are not detectable.

Alison Trinh 1E

The question may be similar to chemical yield questions asking how the theoretical yield compares to the actual yield. In this case, the question may be asking to compare spectroscopic results (similar to the theoretical yield or what the supposed results are) to what is actually calculated in the e...

Alison Trinh 1E

Increasing the intensity of light increases the number of photons. However, to eject an electron, the frequency needs to increase to increase the kinetic energy and thus release/eject the electron. The energy per photon has to be greater or equal to the energy needed to remove an electron.

Alison Trinh 1E

Yes the limiting reactant will get you to your theoretical/maximum yield because the limiting reactant limits the total amount of product formed.

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