CHEMISTRY COMMUNITY

Naneeta Desar 1K

So the expression would include the intermediate?

Naneeta Desar 1K

What is the pre-equilibrium approach?

Naneeta Desar 1K

As temperature increases, so does the rate constant.

Naneeta Desar 1K

A is the frequency of collisions with the correct orientation.

Naneeta Desar 1K

Delta U is the change in internal energy whereas delta H is change in enthalpy.

Naneeta Desar 1K

It's cumulative so Outlines 1-6 are a comprehensive guideline on what will be on the final!

Naneeta Desar 1K

Yes they would be the same since the amount of moles formed and consumed are the same.

Naneeta Desar 1K

You ignore this variable for temperature since it is not included in the equation.

Naneeta Desar 1K

I believe the reaction mechanism just needs to correlate with the rate law.

Naneeta Desar 1K

Intermediates are used up in the reaction, meaning they are formed in one step and consumed in another.

Naneeta Desar 1K

When the reaction rate does not change for the experiments you look at that means that the reactant is 0 order.

Naneeta Desar 1K

Generally when a reactant in the rate equation is squared it is 2nd order.

Naneeta Desar 1K

Kinetics regards the actual rate of the reaction and how fast or slow it goes while thermodynamics regards if the reaction will proceed.

Naneeta Desar 1K

When the equilibrium constant is less than 10^-3 you can assume x is negligible.

Naneeta Desar 1K

You need to choose the reaction where the values of the other equations are constant and the actual reactant you are looking at changes.

Naneeta Desar 1K

Yes I believe so

Naneeta Desar 1K

The whole reaction depends on the slow step.

Naneeta Desar 1K

Yes termolecular would be considered a 3rd order reaction I believe. However these are very uncommon.

Naneeta Desar 1K

Final exam is cumulative: Outlines 1-6. I believe it still will be taken in person.

Naneeta Desar 1K

Add platinum or another inert electrode when there is not a phase change or the oxidized and reduced things are in the same soluttion in the cathode or anode.

Naneeta Desar 1K

In concentration cells the E°cell is always 0.

Naneeta Desar 1K

The review sessions for the final are up on the 14B website!

Naneeta Desar 1K

It disrupts the charges from building up and it keeps neutrality.

Naneeta Desar 1K

h2o is used to balance the amounts of oxygen whereas h+ is used to balance the hydrogens.

Naneeta Desar 1K

How often do I tell chemistry jokes?

Periodically.

Naneeta Desar 1K

A salt bridge can be used to transfer ions.

Naneeta Desar 1K

Galvanic cells gets its energy from the redox reactions that are spontaneous and the electrolytic cells contain non-spont. reactions and needs an electron source which is external.

Naneeta Desar 1K

In order to balance the charges nitrate flows through the porous disk.

Naneeta Desar 1K

In the salt bridge, the anions flow to the anode and the cations flow toward the cathode.

Naneeta Desar 1K

A line is a porous disk, double line is a salt bridge

Naneeta Desar 1K

It does not change even with a variable change in matter.

Naneeta Desar 1K

When it is balanced the number of electrons on the products and reactants of each reaction are balanced.

Naneeta Desar 1K

yes! it will be I believe.

Naneeta Desar 1K

Cell potential changes with the change in concentration: as the reactants increase and products decrease CP increases and as reactants decrease and products increase CP decreases.

Naneeta Desar 1K

I believe that when the bond enthalpy is higher, the bond is stronger.

Naneeta Desar 1K

Since steam has a higher energy than water, it burns more.

Naneeta Desar 1K

https://www.khanacademy.org/math/algebr ... ula-review

This article is helpful in reviewing the quadratic formula! Check it out :)

Naneeta Desar 1K

Delta H is positive since melting is breaking bonds and energy is required in order to do so.

Naneeta Desar 1K

Here you go!

Naneeta Desar 1K

It is because since molecules such as O2 and N2 are readily discovered in this state the enthalpy of formation is 0 kJ/mol.

Naneeta Desar 1K

With constant pressure and no change in volume delta U= delta H. Also when there is no change in pressure and constant volume delta U= delta H.

Naneeta Desar 1K

Yes, p,v,n, and t are all variable while r is constant. It just depends on what information the question provides for you.

Naneeta Desar 1K

It is the difference between the entropy not at equilibrium and crystal state of a substance close to absolute zero.

Naneeta Desar 1K

A state property is an entity that does not depend on how the substance was prepared. State function is another way to indicate a state property

Naneeta Desar 1K

Having a negative square root would not make sense in the context of the problem therefore you should check your previous work to see if you have made a mistake.

Naneeta Desar 1K

Room temperature, approximately 25°C

Naneeta Desar 1K

This principle basically explains that the reaction will favor one side (either the products or the reactants) and how the reaction will continue when an additional condition is placed on the reaction at equilibrium.

Naneeta Desar 1K

If the pressure is increased then the reaction will favor the side where there are less moles of either the products or the reactants.

Naneeta Desar 1K

The ICE table can include solids and liquids however the values will be 0 since they are not included in the equilibrium constant equation so they're impact is negligible.

Naneeta Desar 1K

In addition, adding a catalyst does not affect the amount of free energy (G) in the reaction.

Naneeta Desar 1K

Yes Q is the value calculated when the reaction is not at equilibrium.

Naneeta Desar 1K

I'm not sure what exact details we have to know but in general, ATP hydrolysis is exergonic because there is less free energy in the products than the reactants.

Naneeta Desar 1K

This equation is the ideal gas equation and should be used when you want to convert the concentration to pressure or vice versa.

Naneeta Desar 1K

The modules have very similar information to his lectures so review the modules if you are unclear with a certain topic!

Naneeta Desar 1K

Review your notes at the end of every week to stay on top of the content!

Naneeta Desar 1K

What do you call a funny heme complex?

A meme complex :D

Naneeta Desar 1K

Here's a screenshot from the book.

Naneeta Desar 1K

The problem usually contains an initial number and is usually the standard for how many sig figs need to be in the answer. As a rule of thumb the answer should have the lowest number of sig figs as given in the problem.

Naneeta Desar 1K

pKa= -log(Ka)
It is used to address the strength of acids. If the pKa is low then the acid is strong, if the pKa is high it refers to a weak acid.

Naneeta Desar 1K

Strong bases also dissociate completely similar to strong acids. By identifying which molecule has a greater dissociation ability you can identify which molecule is stronger.

Naneeta Desar 1K

First identify what the problem addresses in terms of topics because each topic we learned in quantum has particular equations. For example if the question is regarding the photoelectric effect the equations used are very centralized to that topic.

Naneeta Desar 1K

A strong base is one that is completely dissociated in an aqueous solution.

Naneeta Desar 1K

Anemia results from a low vitamin B12 count.

Naneeta Desar 1K

Yes I can send mine to you!

Naneeta Desar 1K

I believe for the final we will have to know both the bronsted and lewis definitions since we went over both in lecture.

Naneeta Desar 1K

I believe ferrate is the Latin name for iron and we use this name for coordination compounds.

Naneeta Desar 1K

Acidic oxides usually are oxides of nonmetals whereas basic oxides are normally oxides of metals. So, acidic oxides dissolve in water to form acids while basic oxides dissolve in water to form a metal oxide which is basic. In addition, acidic oxides are covalent compounds whereas basic oxides are io...

Naneeta Desar 1K

By breaking down KBr, K+ and Br- is formed. K+ is weak and is attracted to the negatively charged H20 however the attraction is not completely strong enough to adjust the structure of the water molecule. Br- is attracted to the positively charged side of H2O but also isn't strong enough to adjust th...

Naneeta Desar 1K

When will be getting back our second test?

Naneeta Desar 1K

Many of the transition metals have multiple charged ions therefore the roman numerals clarifies and distinguishes them.

Naneeta Desar 1K

Carbon is tetravalent because it can form 4 bonds with atoms.

Naneeta Desar 1K

They are the atoms present at both ends of a molecule.

Naneeta Desar 1K

Dispersion/Van der Waals

Naneeta Desar 1K

Since ionic bonds form strong electrostatic interactions with ions they have higher melting points than covalent compounds.

Naneeta Desar 1K

Yes, I believe we do since it was covered in lecture.

Naneeta Desar 1K

Yes I don't think we need to know the exact angles but remember if there is a lone pair then the angle might be less than the ones indicated.

Naneeta Desar 1K

It's considered a type of dipole-dipole interaction but it is stronger than the normal dipole-dipole interaction.

Naneeta Desar 1K

You can look at the symmetry of the atoms in order to determine polarity.

Naneeta Desar 1K

The equation sheet is linked here: https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf

Naneeta Desar 1K

Ion dipole occurs between an ion that is fully charged and a dipole that is partially charged, whereas ion induced dipole occurs with a fully charged ion and a dipole that is temporarily charged.

Naneeta Desar 1K

Rod shaped molecules have more surface area when they are condensed with one another therefore increasing the area of intermolecular forces having a higher boiling point, spherical molecules have lower boiling points since they don't have an increase in forces.

Naneeta Desar 1K

This is because in the case of H2O due to the electron electron repulsion the electrons expand forcing the bonds to be pushed down causing H2O to have a bent shape.

Naneeta Desar 1K

Electronegativity is the ability for an atom to electrons to bond to the element and polarizability is the extent to which an atom is distorted and how dipoles form.

Naneeta Desar 1K

Electronegativity decreases down a group due to the increase in shells making the electrons further from the nucleus therefore decreasing the attraction between the protons and electrons.

Naneeta Desar 1K

They help to predict the molecule's polarity.

Naneeta Desar 1K

I believe that for those they might give us the formula since those aren't the ions that we see everyday however I am not completely sure.

Naneeta Desar 1K

You can figure out the amount by looking at the group the element is categorized under. The group number is usually the amount of valence electrons the element has.

Naneeta Desar 1K

The hybridization is associated withthe atom's steric number. Which is "steric number=# of atoms bonded to the atom + # of lone pairs the atom has"

Naneeta Desar 1K

It represents the free electron pairs.

Naneeta Desar 1K

Where will be taking the midterm? The same lecture hall as class?

Naneeta Desar 1K

Electronegativity is the process of atoms to attract electrons in order to build bonds. Effective nuclear charge is the nucleus's pull and strength to hold in the electrons.

Naneeta Desar 1K

I do best when I study in a group. I understand information better when other people explain and give their input into various topics!

Naneeta Desar 1K

Will there be a review session for the midterm?

Naneeta Desar 1K

Yes, just stick to the ones he provides us.

Naneeta Desar 1K

For large objects the wavelength would be far to small to be observable.

Naneeta Desar 1K

A quick explanation is that the atomic orbital is math function in which explains the wave behavior of either 1 electron or an electron pair in an atom and are composed of electrons in the same energy levels but have different spins. The wave functions are exact physical solutions of Schrodinger equ...

Naneeta Desar 1K

Yes, I believe so, however keep in mind that when applying this number to the context of various problems the value of the photon emitted will not be negative.

Naneeta Desar 1K

There are a ton of coffee shops in Westwood that you can study at! Profetta is one of my favorites.

Naneeta Desar 1K

Planck's constant connects the frequency of the electromagnetic radiation to the energy in a quantum or also known as a photon. Rydberg's constant connects the electromagnetic spectra of an atom and is a physical constant.

Naneeta Desar 1K

hello! I was confused on this too and I found this website that explains it very well! Hope this helps :) https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Mechanics/09._The_Hydrogen_Atom/Atomic_...

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