CHEMISTRY COMMUNITY

Leslie Almaraz 4G

I think they will be provided!

Leslie Almaraz 4G

when do you know which to use?

Leslie Almaraz 4G

this term is to signify the reverse reaction

Leslie Almaraz 4G

I've been doing a lot of independent studying through khan using the outlines given by Lavelle in order to guide my research.

Leslie Almaraz 4G

what if there are two variables changing?

Leslie Almaraz 4G

the spontaneity does depend on the enthalpy and entropy as seen in the equation

Leslie Almaraz 4G

are there any special characteristics they have?

Leslie Almaraz 4G

when do you know you are allowed to use this formula?

Leslie Almaraz 4G

great job !!!

Leslie Almaraz 4G

it also can depend on the reaction and the compound

Leslie Almaraz 4G

this is in an elemental state so it should be 0

Leslie Almaraz 4G

I think it depends on the classification of the question

Leslie Almaraz 4G

a positive E value will result in a negative delta G meaning it is spontaneous

Leslie Almaraz 4G

does the flow of electrons indicate which of the metal pieces is being eroded in the solutions?

Leslie Almaraz 4G

yes because there must be a solid conductor in each of the reactions. make sure to indicate this in the cell diagram

Leslie Almaraz 4G

what is the purpose of identifying the agents?

Leslie Almaraz 4G

does this mean that if the Ecell is positive then more products are being produced making it spontaneous?

Leslie Almaraz 4G

how do you determine it based on the cell potentials? especially if the values are similar?

Leslie Almaraz 4G

would it be spontaneous if it was positive?

Leslie Almaraz 4G

Is there different equations to use?

Leslie Almaraz 4G

Is irreversible always sudden?

Leslie Almaraz 4G

there is also a different way to find Cv and Cp for mono and diatomic molecules.

Leslie Almaraz 4G

this is the heat capacity of the system at constant volume

Leslie Almaraz 4G

What about an adiabatic system? is there a different equation for that?

Leslie Almaraz 4G

I also know that the 1 o-clock lecture and the 3 o-clock lecture are going to have combined grading because there is only one TA for the last lecture and it wouldn't be fair for her to have to grade all of them.

Leslie Almaraz 4G

Is there several versions of the kb constant that can be used in the equation?

Leslie Almaraz 4G

would this change the dynamics of the system?

Leslie Almaraz 4G

Can we always replace the q,rev with the change in enthalpy?

Leslie Almaraz 4G

are there any other cases where the change in internal energy will be negative?

Leslie Almaraz 4G

Is there a way to remember all the equations for entropy and the conditions they satisfy?

Leslie Almaraz 4G

Can there be a change indicated to p, v, r, and t depending on the question?

Leslie Almaraz 4G

This is because they are both scaled the same. However, if this is still confusing try just using Kelvin.

Leslie Almaraz 4G

State properties are allowed to be added or subtracted to each other.

Leslie Almaraz 4G

is there a max heat capacity on a system?

Leslie Almaraz 4G

phase changes occur at a constant temperature?

Leslie Almaraz 4G

Ka and Kb are only assigned to weak acids and weak bases?

Leslie Almaraz 4G

Do you only assume x has a small change if Ka or Kb is less than 10^-3?

Leslie Almaraz 4G

Does increasing the partial pressure of one element, affect the partial pressure of another? Or does this only apply when increasing the overall pressure?

Leslie Almaraz 4G

How do you know which variation of the R constant to use?

Leslie Almaraz 4G

I'm still a little confused about K and Q. Does change temperature change K or Q? Does a change in concentration change Q?

Leslie Almaraz 4G

Is there an easy way to calculate/ tell if you have calculated the wrong answer? or your answer is completely not possible?

Leslie Almaraz 4G

Any way to study effectively for the test next week? Are we being tested on chemical equilibrium and acids and bases?

Leslie Almaraz 4G

Are there shortcuts that can be applied when using the quadratic equation?

Leslie Almaraz 4G

What are the different categories of stress that can be applied?

Leslie Almaraz 4G

Is there a value that K can not reach? Because I was thinking that electrons can not move faster than the speed of light which limits speed. So is there a threshold that K can not reach?

Leslie Almaraz 4G

Why does K not have any units? I know units matter when plugging it into the equation, but why doesn't it have any units after it is calculated?

Leslie Almaraz 4G

In high school, I had to draw graphs comparing these values in order to show which is favored. Is this something we are going to have to do?

Leslie Almaraz 4G

When would we have to compare K and Q values to each other? Does this give us information about the reaction as it is happening?

Leslie Almaraz 4G

How do you combine two reaction equations together? Are there times where things are going to cancel out?

Leslie Almaraz 4G

If Q>K, does this mean that the forward reaction is favored and it must continue in the reverse reaction in order to reach equilibrium?

Leslie Almaraz 4G

There are some that come out a lot and are very common. those should be easier to memorize.

Leslie Almaraz 4G

Just make sure you remember if they have any charge associated with them.

Leslie Almaraz 4G

You should show that one of the atoms is pulling the electrons their direction giving it a slight charge.

Leslie Almaraz 4G

What about the Arrhenius definition of acids and bases?

Leslie Almaraz 4G

I heard that we only need 250 points in the whole class to pass. Is this true?

Leslie Almaraz 4G

Thank you for sharing your experience! Is there any time where you felt like you were behind others in your class or felt discouraged? I believe this is very common in big school settings.

Leslie Almaraz 4G

Is there any vocabulary we should be familiar with for the final exam?

Leslie Almaraz 4G

Does anyone know how many questions are going to be on the final? what topics may be emphasized?

Leslie Almaraz 4G

Are there any specific videos online that have helped people study? for quantum, lewis structures, hybridization, shapes, and chemical properties?

Leslie Almaraz 4G

What are some effective ways to study for the final? specific topic to focus on?

Leslie Almaraz 4G

When given the name of the compound, does it matter the order in which you formulate the atomic symbols?

Leslie Almaraz 4G

Should we know the biological functions of transition metals?

Leslie Almaraz 4G

Will we have to draw the coordination compounds exactly the way they are bonded? as in making Ni bond with O in H2O

Leslie Almaraz 4G

Is the only way to determine is a compound is trans- or cis- by the formation of the atoms?

Leslie Almaraz 4G

How do you determine oxidation numbers based on a name? or a compound?

Leslie Almaraz 4G

How do you determine dipole moments? Is it just based on the atoms in the periodic table?

Leslie Almaraz 4G

You should know the shape of the compound and it relative to the charges of the atoms.

Leslie Almaraz 4G

I think there is a slight charge on each side that makes it polar.

Leslie Almaraz 4G

There would be no E term in the notation.

Leslie Almaraz 4G

Is there another way to determine the formal charge of an atom without the equation?

Leslie Almaraz 4G

How do you determine which element is better to have a formal charge in a compound?

Leslie Almaraz 4G

How do you know if two elements form a covalent bond? Is this known through determining if an element is a non metal and a metal?

Leslie Almaraz 4G

If an element has more than 8 electron in the outer shell, is this allowed because it has another orbital it can fill?

Leslie Almaraz 4G

Why are triple bonds stronger than double bonds? Does this mean then have a stronger pull to the electrons?

Leslie Almaraz 4G

How do we know how much a covalent bond has ionic properties? like to what extent can they have ionic properties?

Leslie Almaraz 4G

What are the rules that electron configurations follow? How do we know if they don't have to follow a certain rule? Do they apply when electrons are in excited states?

Leslie Almaraz 4G

How do we know that there are several ways to draw a chemical structure?

Leslie Almaraz 4G

During the review session, the UA's said that we used c=h/frequency when dealing with electromagnetic radiation. What do they mean?

Leslie Almaraz 4G

Is there any application of this equation we need to know? or is this more of a concept we must understand?

Leslie Almaraz 4G

Are resonance structures just bonds that can be written in different forms because of the ambiguity of the shape?

Leslie Almaraz 4G

What if an atom is in an excited state and not ground state? Does this change the electron configuration? If so, do the principles and rules change?

Leslie Almaraz 4G

I am still a little confused about what electron affinity is. What I understood from the lecture is that it is the energy that is released when an electron is added to a gas phase atom. How do we know an atom is in gas phase or are all atoms in gas phase?

Leslie Almaraz 4G

Is the threshold energy something that can be calculated or is it a given value that can not be found through an equation?

Leslie Almaraz 4G

Are isoelectronic atoms just elements with the same number of electrons?
Is there anything else we should know about these?

Leslie Almaraz 4G

I know that Lavelle mentioned that he prefers us to not use the Rydberg equation; however, I wasn't exactly sure why he wants us to use a different equation. Can someone help me out?

Leslie Almaraz 4G

What do the 4 quantum numbers represent as in n, l, ml and ms?

Leslie Almaraz 4G

Lavelle had mentioned that psi represents the height of a wave function at position x, y, and x. While (psi)^2 represents the probability of finding an electron. I wasn't sure what he meant; does he mean it represents the probability of finding an electron in a certain orbital?

Leslie Almaraz 4G

Lavelle had mentioned that psi represents the height of a wave function at position x, y, and x. While (psi)^2 represents the probability of finding an electron. I wasn't sure what he meant; does he mean it represents the probability of finding an electron in a certain orbital?

Leslie Almaraz 4G

De Broglie used light in order to derive the equation. The equation will work for any particle with momentum and it has a wavelength with its properties.

Leslie Almaraz 4G

Are you talking about the diffraction waves that were presented at the start of class or the waves that were surrounding the nucleus?

Leslie Almaraz 4G

Responding to the person above, for E=hv, the v represents frequency. This is not the same symbol that is used for Debroglie's question which it wavelength= h (plank's constant)/, p (momentum). Momentum is also equal to mass x velocity, which is not the same as the v representing frequency.

Leslie Almaraz 4G

Lavelle has mentioned that an electron was wavelike behavior when it is able to travel through a slight and it is present in more than one place so it looks like a wave.

Leslie Almaraz 4G

According to DeBroglies equation, the higher the mass, the smaller the wavelength and are more likely to have particle-like behavior.

Leslie Almaraz 4G

Electrons have a very small mass. Most of the mass of an element depends on the mass of protons and neutrons. The approximate mass of an electron is about 9.10938 x 10^-28 g.

Leslie Almaraz 4G

The purpose of Schondigers equation is to allow us to find how states evolve over time. However, this will not be emphasized in this course.

Leslie Almaraz 4G

It is best to hold onto a couple significant figures until the end. This will make sure your answer is the most accurate with the given quantities in the question.

Leslie Almaraz 4G

In order to easier remember how to convert, just think if the prefixes and number. For example, kilo would be 1000. Centi would be 1/100. Mili would be 1/1000.

Leslie Almaraz 4G

Here are some of the steps you should take in order to get to your answer: 1. convert grams of CO2, H2O, and N2 to moles in order to have a universal unit you could compare the elements to. 2. break down the elements to the grams that were given in the question, break CO2 down by the mass given 0.68...

Leslie Almaraz 4G

The quantum number of l corresponds to the shape of the orbital. Quantum numbers specify specific spacial qualities of an orbital. l=0 corresponds to the s orbital. While l=1 corresponds to the p-orbital, l=2 corresponds to the d orbital and l=3 corresponds to the f-orbital.

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