CHEMISTRY COMMUNITY

Megan Yabumoto 3K

Newman projections are used to visualize conformations of one carbon-carbon bond so are only drawn with one in the front and one in the back. Different visualizations would be used to depict the conformations of more than 2 carbons.

Megan Yabumoto 3K

How different do your structures look? I'm pretty sure in the case of drawing organic structures all answers are uniform and there isn't variation. If the numbering of carbons is off, maybe you just need to flip your drawing to mirror the answer in the book.

Megan Yabumoto 3K

When determining the numbering for structures of compounds that have a double bond, you want the first number to be the smallest it can possibly be. In this case, you would start at one and go all the way around to six because you must go across the double bond.

Megan Yabumoto 3K

Systematic naming is the IUPAC naming

Megan Yabumoto 3K

The given values for standard cell potential of the half reactions are given as reductions. In order to calculate the cell potential of the oxidation reaction, you take the opposite sign of the value given for the reduction. If you reverse the sign of the oxidation reaction, then you add the values ...

Megan Yabumoto 3K

I want to say that Quiz 3 will cover the end of the kinetics section up to what we cover in Organic chemistry before the quiz because we have not been tested on those parts yet.

Megan Yabumoto 3K

An ambident nucleophile is a molecule that has more than one nucleophilic site and has a negative charge delocalized by resonance, so in order to identify the ambident structure you would need to know which molecules have resonance structures. If you are not able to identify from the chemical equati...

Megan Yabumoto 3K

Yes, when you are naming the substituents you use the -enyl form instead of the -ene form.

Megan Yabumoto 3K

Two chemists go into a restaurant.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" -- and he died.

Megan Yabumoto 3K

I'm pretty sure that since we are being tested on electrochem on the midterm that the quiz will only cover kinetics

Megan Yabumoto 3K

What is a concentration cell exactly? A concentration cell is a galvanic cell that has two equivalent half cells of the same composition. The only thing that is different between the two half cells is the concentration, whereas in a galvanic cell there is an anode that differs in composition from t...

Megan Yabumoto 3K

Room 125, Hedrick Hall
Saturday: Brandon (11am-1pm), Eunho (1-3pm), Nicole (5-6pm)
Sunday: Bryan (11am-1pm), Dominic (1-3pm), Jiaming (3-5pm), Lillian (5-7pm)

Megan Yabumoto 3K

To determine entropy, you would only use (deltaS)= (q(rev))/T for an isothermal process. (by context of your question I am assuming you are thinking of this equation) However, since there is a change of temperature, you would use the equation (deltaS)=n(Cp)(ln(T2/T1)). For an increase in temperature...

Megan Yabumoto 3K

Yes, I do believe that there is a limit to how much power a cell can generate. The amount of power is related to the current and type of material used within the chemical reaction that is underwent in the battery to produce the "fuel" that powers a cell.

Megan Yabumoto 3K

Have you heard that entropy isn't what it used to be??

Megan Yabumoto 3K

Since there are three different ways to calculate the reaction enthalpy, the information that is given could be: 1) the summation reactions and each reactions enthalpy where we would use Hess's Law 2)the bond enthalpies where we would need to have a balanced equation or 3)standard reaction enthalpie...

Megan Yabumoto 3K

To solve this problem, you would first write out the reaction. Balance P + Cl -> PCl3. The rest of the information is given to determine the molar heat capacity using the equation: n x (Cp) x (change in temperature)

Megan Yabumoto 3K

I am not sure if I am understanding your question about the problem completely, but the value given in the table for the standard enthalpy of formation for water is the same value calculated in the solutions manual for the problem. I do not think any of the problems will be as easy as looking at the...

Megan Yabumoto 3K

Standard enthalpy of formation is the enthalpy change of the reaction for which it is formed in reactant/product standard states. Standard reaction enthalpy is the difference between standard enthalpies of formation of the products and reactants. Thus, you use the enthalpies of formation to solve fo...

Megan Yabumoto 3K

The other day in class Dr. Lavelle mentioned that the big idea of indicators is that the best indicators to use are the ones that have an end point that equals the stoichiometric point of a titration. There is a HW problem in chapter 13 that has us find the range for pH of indicators for a given pH....

Megan Yabumoto 3K

Yes, it it pretty much a shortcut to determine the pH. If you are given the values necessary to plug into the equation, there is much less work involved and you can avoid the ICE tables.

Megan Yabumoto 3K

When looking at a chemical reaction, in general, an acid consists of a non-metal with a hydrogen whereas a base consists of a metal with a hydrogen. If a carbon compound has a hydrogen next to an oxygen, then that usually dissociates to an acid. H is usually listed at the front of the acidic compoun...

Megan Yabumoto 3K

What happens when spectroscopists are idle?

They go from notating nuclear spins to notating unclear puns...

Megan Yabumoto 3K

When looking to place an extra valence electron for an ion, you need to look at the orbitals of both atoms and determine what is more favorable. In most cases it is on the more electronegative atom, but you can also take into account Hund's rule and Pauli's exclusion principle. For O2- it doesn't re...

Megan Yabumoto 3K

In cases where you are given the initial concentrations of some part of an equilibrium equation, you will need to use the ICE tables to be able to determine the equilibrium concentrations for the reaction. I stands for Initial concentrations, so you would write out whatever molarities that were give...

Megan Yabumoto 3K

If a reaction is favorable in one direction, it is possible that if the conditions of the reaction change, then the direction in which the reaction is favored can also change.

Megan Yabumoto 3K

I do believe that cyano and cyanido are the same thing, just cyano is the old way of naming CN-.

Megan Yabumoto 3K

Since C2H6 is symmetrical, the dipole moments that occur between C-H balance each other out because there are two carbon atoms that bond with the same number of hydrogen atoms. The symmetry and canceling out of dipoles makes C2H6 nonpolar.

Megan Yabumoto 3K

When we are looking at the hybridization of pi bonds, we are looking at the electrons found in the outermost shell. We only look at the outermost shell because those are the electrons that undergo bonding/ electron sharing. For the examples we have done so far in class, we have only been looking at ...

Megan Yabumoto 3K

Why does hamburger have lower energy than steak?

Because its in the ground state!

Megan Yabumoto 3K

To be electronegative is to have a strong electron pulling power. When comparing bond lengths and ionic character, we can look at the trend that the greater the difference in electronegativity, the greater the ionic character. So, the more electronegative the bond, the shorter the bond length and th...

Megan Yabumoto 3K

I am on the second floor! If you create a group chat just post it so I can join and let you know when and where we can meet up!

Megan Yabumoto 3K

When determining the principal and orbital angular quantum numbers, you must keep in mind that n (the principal quantum number) corresponds with the energy level {1,2,3...} and that is given in the beginning of the number. The l (the angular quantum number) corresponds to the number associated with ...

Megan Yabumoto 3K

Although K does have a lower ionization energy, in this case P is the central atom because it is capable of obtaining more than its octet of electrons. Potassium is too small to be able to hold more electrons than in their octet.

Megan Yabumoto 3K

In order to determine the amount of AlCl3 that will be produced, you will first need to determine which of the two reactants is the limiting reagent. Convert the given grams for each reactant to moles. Use these values to determine which is in the smaller quantity. Then, use the limiting reactant an...

Megan Yabumoto 3K

My TA had mentioned during her office hours that we should refer to page 255-256 in the Course reader to determine how much of an understanding we will need of the Schrodinger Equation.

Megan Yabumoto 3K

I believe you can assume that is the correct state for PCl3. Since it can only take the form of a liquid, that is by definition what state it will be in. Usually, a reaction between a solid and a gas will result in the hydrolysis of one of the elements that will produce a liquid.

Megan Yabumoto 3K

Yes, it is necessary to keep track and write down the physical states of the reactants and products. This is especially necessary when applying these equations for precipitation reactions and other types of reactions where states are being changed.

Megan Yabumoto 3K

Yes, the two negatives will cancel out when being divided. That will leave the answer as a positive value.

Megan Yabumoto 3K

To answer the first question, the answer is n=7 because you are looking for the next line in the series. So when you had solved and found n=6, you are using that as the baseline to find the wavelength of the next energy level. To answer the second question, when you are going from a higher energy le...

Megan Yabumoto 3K

I'm from Rieber Terrace but would like to join! Please lmk if there's a chat I can join.

Megan Yabumoto 3K

Yes, since it is a combustion reaction and the products listed are CO2, H2O, and N2, the components of caffeine are C,H,N, and O. In order to determine the amount of oxygen present in caffeine, you will have to determine the masses of the other elements present and subtract that from the total mass ...

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