CHEMISTRY COMMUNITY

Annika Zhang 1F

more hydroxide ions means a more basic solution while more hydronium ions produce a more acidic solution

Annika Zhang 1F

I would just memorize the strong acids or bases

Annika Zhang 1F

as long as one molecule has O,N,or F it is a potential bonding site as long as there is a Hydrogen on the other molecule

Annika Zhang 1F

are you referring to conjugate acids and bases?

Annika Zhang 1F

Annika Zhang 1F wrote:reverse arrow are only denoted if the reaction doesn't dissociate completely

edit: if the acid doesn't dissociate completely. this is used primarily for weak acids and bases

Annika Zhang 1F

reverse arrow are only denoted if the reaction doesn't dissociate completely

Annika Zhang 1F

test grades are not adjusted but I heard final grades might be

Annika Zhang 1F

multiply concentrations of products and divide it by the concentrations of multipled reactants reactants; don't include concentrations of liquids

Annika Zhang 1F

ion dipole bonding is stronger

Annika Zhang 1F

You would do well to memorize the table. If you forget you can try drawing the Lewis structure to figure it out, but this is difficult for more complicated ligands https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/NamingCoordinationCompounds.pdf is this the table you are referring t...

Annika Zhang 1F

hydrogen can occur is there is a H in one molecule and there is any one of O,N,F in the other

Annika Zhang 1F

ligands should be denoted in alphabetical order not including prefixes

Annika Zhang 1F

the equivalence point is the point at which chemically equivalent quantities of reactants have been mixed however this could mean equal quantities of a strong acid and weak base it d9esnt indicate what reactants are being used

Annika Zhang 1F

905174774 wrote:FOr pi bonds, a triple bond is considered one sigma bond and two pi bonds right?

yes, after the initial sigma bond acting as a single bond, each additional bond is a pi bond

Annika Zhang 1F

ShastaB4C wrote:Does anyone know approximately how many questions the final exam will be?

It should be 1.5 times the lengthof the midterm

Annika Zhang 1F

Madeline Phan 4H wrote:How much of the acid-base section is going to be on the final? I'm not sure what to focus on.

the number of questions depends on the amount of time we spent on the topic

Annika Zhang 1F

the final does not cover the pre midterm content as thoroughly, while it still includes those topic, it mostly focuses on post midterm content

Annika Zhang 1F

cisplatin is a non targeting chemotherapy drug that prevents cell growth. memorize the shape; it could be on the final

Annika Zhang 1F

Lyndon said memorized the ligand sheet on lavelles website

Annika Zhang 1F

sigma bond are when given a lewis structure are noted by single bonds while each additional bond is a double bond

Annika Zhang 1F

acid and base reactions are frequently strong or weak acids/bases reacted with an aqueous solution

Annika Zhang 1F

electronegativity increases up and to the right of the period stable. this would be useful in determining things like bond strengths

Annika Zhang 1F

when given the equation, strong bases completely ionize so they only have a single sided arrow while weak bases have double sided arrows

Annika Zhang 1F

to find pH you generally use -log[H+] when given H+ concentration or 14-(-log[OH-]) the given the concentration of OH-.

Annika Zhang 1F

atomic radii is especially useful for determining strength of bonds, bond length, and periodic trends like electronegativity.

Annika Zhang 1F

actually based on the types of questions given out during review it could be heavily calculation based but still have many conceptual questions

Annika Zhang 1F

more calculation based

Annika Zhang 1F

Frequency is related to photon's energy and intensity is related to number of photons emitted in radiation

Annika Zhang 1F

if given the equation for the acid, it should have a double sided arrow to separate products and reactants

Annika Zhang 1F

lone pairs are in their own hybrid orbital so they count as one electron group towards hybridization

Annika Zhang 1F

a double sided arrow indicates a weaker acid or basethat doesn't dissociate completely. the single sided arrow represents the dissociation of a strong acid or base that dissociates completely.

Annika Zhang 1F

most of the time sig figs for pH only go to one decimal place after the whole number

Annika Zhang 1F

a negative pH represents a solution where the molarity of hydrogen ions is more than 1

Annika Zhang 1F

pi bonds are weaker because sigma bonds have a larger orbital overlap but combined with a sigma bond, it creates a stronger bond

Annika Zhang 1F

ka is used for weak acids!

Annika Zhang 1F

Lyndon said to memorize it all

Annika Zhang 1F

8 free response but there will be multiple parts to each question

Annika Zhang 1F

Im not completely sure how the test is graded but I assumed that because it was free response, partial credit would be issued. Thus, it would be similar to how the AP exam is usually graded where is the concept, or the work was done in the right direction, it would get a certain number of points.

Annika Zhang 1F

after finding the empirical formula, you divide the mass of the molecular formula by that of the empirical formula. Should the value derived from the equation be the value of 1, that means that the empirical formula is equal to that of the molecular formula

Annika Zhang 1F

Threshold energy is the lowest possible amount of kinetic energy needed to collied and eject electrons.

Annika Zhang 1F

when finding the empirical formulas, percentages are usually given for each element's make up in the compound. Thus, when we are given only the percentage without a specific mass of the sample, we assume that there is a 100g sample. This allows you to covert percentage directly to it's same numerica...

Annika Zhang 1F

Dr.Lavelle unfortunately doesn't post ppt slides on his website. I do believe, however, that each lecture has been bruincasted but I'm not entirely sure. If you need help on specific topics, I would refer to the modules on Dr. Lavelle's website or to attend TA or UA office hours.

Annika Zhang 1F

An angstrom is 10^-10, an incredibly small unit of measurement. Thus, the angstrom is most commonly used to measure wavelength or minuscule distances. If you look towards the bottom of the provided formula sheet, you'll see the conversion units from one angstrom to however many meters.

Annika Zhang 1F

in terms of molarity, the equation is mols of solute/ volume of the solution. the solute IS in mols, however, the solution is in liters rather than mols. Thus, the equation does not cancel out mols. <mols solute/liters of solution>

Annika Zhang 1F

when determining molar mass and using it to derive another unit, I personally don't round the molar mass unless it has 2 decimal points with 9's (2.99 up to 3) this way, the answer I get in the end is most accurate and allows me to round up to the correct number of sig figs and a more accurate value

Annika Zhang 1F

the amount of sig figs you need to round to typically determine when you use scientific notation.

Ex: if I need 12345 with 2 sig figs, it would be 1.2x10^4

Annika Zhang 1F

Avogadros number is a constant, 6.022 x 10^23. It describes the number of atoms, molecules, or "things" in a mole. Typically you use this constant when the question asks you to find the number of molecules OR atoms in a mol. Take the number of mols derived from the problem and use dimensio...

Annika Zhang 1F

sig figs would play a role primarily in the beginning and in the end solution of a problem. Professor Lavelle wasn't too clear on if they would affect the validity of your final answer but to be safe, I would take the numeric values given at the beginning of the problem and check for their sig figs,...

Annika Zhang 1F

I myself don't completely understand the answer to this question as well but I believe the kilogram was made to be the base unit for mass because initially, the kilogram was developed by the French government but after the revolution, the standing Republican government decided to adopt the metric sy...

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