CHEMISTRY COMMUNITY

Ranger Saldivar 2D

In the orange organic chemistry book, on page 23 of section 1.6 why does the methylpropyl go in front of just the regular methyl? Doesn't methyl go first to make it 1-methyl-4-(1-methylpropyl)cyclohexane?

Ranger Saldivar 2D

So reviewig the kectures and my notes, I am wondering if their is a difference between torsional strain and an eclipsed conformation? An eclipsed conformation and torsional strain both relate to the highest energy state right, while staggered is the most stable?

Ranger Saldivar 2D

Even if I ignore the t in trimethyl the e in ethyl comes before the m in methyl so shouldnt ethyl be named first?

Ranger Saldivar 2D

On the first Quiz 3 Preparation for number 2 why is it 2,2,4-trimethyl-3-ethylpentane instead of 3-ethyl-2,2,4-trimethylpentane. Also how do you detemine if the trimethyl has 2,2,4 instead of 2,4,4?

Ranger Saldivar 2D

For benzene are we supposed to be able to know what it is based on memorization or is there a way to decipher it from its name alone? Additionally, are there other common names we should learn, whether they relate to alkanes or not?

Ranger Saldivar 2D

For the recent midterm on question 8 why is there three siginificant answers in the form of 1.20V when the two other cell standard cell potentials of .80V and -.40V only have 2 significant figures?

Ranger Saldivar 2D

In the book I was trying to solve problems for the rate of reaction for number 3 and i assume the rate of reaction just deals with the reactant NO2, but was confused on what the unique rate of reaction referred to. Can anyone clarify the differences and how to find it?

Ranger Saldivar 2D

In 14.11 a why is the sign standard cell potential for nickel remain -0.23 even though I reversed the half reaction from reduction to oxidation of nickel?

Ranger Saldivar 2D

So, despite their names is the oxidizing agent the substance that is being reduced and vice-versa for the reducing agent? Basically they are the opposite of what their name implies.

Ranger Saldivar 2D

Is the standard cell potential always positive or does it depend on whether you are undergoing reduction or oxidation? In the course reader on page 49 it says that Cu2+ and 2e- which makes Cu has a standard cell potential of .34V. Is there only a negative value if you switch the reactants and produc...

Ranger Saldivar 2D

I was looking in the book and noticed that to oxidize C2H2O4 you need to identify the charges on the molecules. As far as I know C has a 4+ charge so why is it +3 on the left. Also once the oxidation takes place on the left it has a 4+ charge is there something I'm misssing?

Ranger Saldivar 2D

Thanks I didn't see the c so I did not know it meant combustion.

Ranger Saldivar 2D

In 8.57, in the textbook, to find the reaction enthalpy when given the final reaction, in this case the hydrogention of ethyne to ethane, how do we know how to get to that reaction with the use of other reactions. Do we always take the reactants and producta and combust them with O2?

Ranger Saldivar 2D

Yes because there is an Al2O3 as the product so adding a 3/2 to the O2 would balance the equation.

Ranger Saldivar 2D

If you are expanding a gas by a constant external pressure to match the positive difference in $\Delta$ V you need to account for the loss in work by putting a negative sign in front of the equation.

Ranger Saldivar 2D

So from my understanding heat capacity depends on the size of a sample right, for example, if we had a small and large piece of ice the heat capacity for the larger one would be higher since heat capacity is mass times specific heat capacity. However, I am also confused on how to determine specific ...

Ranger Saldivar 2D

What exactly is the criteria that differentiates whether something is considered a state property or not. Also, based on work and heat not being state properties can the explanation on them being classified so due to it, "depending on the path taken" be elaborated on.

Ranger Saldivar 2D

I'm pretty sure it relates to phase changes, such as water, in order for it to go from the liquid phase to gas phase it requires a certain amount of heat to go from liquid to vapor. Once enough heat is added the liquid can finally go to vapor and increase in temperature again as a vapor.

Ranger Saldivar 2D

As far as I know whenever you are given a chemical equation you should always make sure that products and reactants are balanced since if you don't then calculations for equlibrium constant and such will be off.

Ranger Saldivar 2D

On the midterm on question 3 I wrote out the photoelectric effect which is energy of photon- work fuction= excess energy of electron and got it wrong so does it have something to do with the mentioning of conservation of energy, if so what does it mean?

Ranger Saldivar 2D

IMG_0531_CLIPCHAMP_360p.mp4 [ 31.21 MiB | Viewed 505 times ]

I go over which MO diagram to use with examples, bond order, diamagnetism and paramagnetism, LUMO and HOMO, and molecular electron configuration.

Ranger Saldivar 2D

All I know is that the metal is written first in the chemical formula regardless, but the ligands are written first in alphabetical order when naming them so I would assume write them in alphabetical order as well when writing them out in the chemical formula.

Ranger Saldivar 2D

On page 75 of the course reader, it states that in order to be considered an ionic bond, heteronuclear atoms must have an electronegativity difference greater than two. How do we determine the values of electronegativity to determine if a bond should be considered ionic or covalent?

Ranger Saldivar 2D

So according to class lecture, an expanded octet is when an element can have more than 8 valence electrons after sharing electrons so is this rule only applicalble to those elements in the 13, 14, 15 , 16, 17, and 18th groups minus those in the 2nd period since they have an available d-orbital?

Ranger Saldivar 2D

Why would I use 10.23 x 10^-19 if the least number of significant figures is 3 instead of 4?

Ranger Saldivar 2D

For the problem, it states if molybdenum is irradiated with light of wavelength of 194 nm, what is the maximum possible kinetic energy of the emitted electrons, based on problem 9 molybdenum must absorb radiation with a minimum frequency of 1.09 x 10^-15 s^-1 before it can emit an electron from its ...

Ranger Saldivar 2D

So when using the mass of an electron for like calculating the kinetic energy of an ejected electron do we use the entire mass of 9.10938 x 10^-31 kg instead of rounding it to 9.11 x 10^-31 kg?

Ranger Saldivar 2D

On page 31 of the course reader I've noticed that when calculating the mole of carbon atoms by dividing the grams of carbon given which was 40.9 g the grams per mole it was divided by was 12.01 instead of 12.011 which is given on the periodic table. Does it matter how much of the atomic mass you use...

CHEMISTRY COMMUNITY

Search found 28 matches

Determining Order of Substients

Eclipsed Conformation and Torsional Strain

Re: Quiz 3 Preparation # 2

Quiz 3 Preparation # 2

Knowing Certain Common Names

Standard Cell Potential Significant Figures on Midterm

Difference between rate of reaction and unique rate

Clarification on 14.11a

Clarification on Oxidizing and Reduction Agents

Clarification on Standard Cell Potential

Oxidation of C2H2O4

Re: 8.57 Clarification

8.57 Clarification

Re: Typo in question 8.55?

Re: Work equation

Clarification on Heat Capacity and Specific Heat Capacity

Explanation on State Properties

Re: Enthalpy of Sublimation

Re: balanced reactions

Photoelectric Effect Conservation of Energy

Video: Molecular Orbit Theory Review

Re: Naming in the Correct Order

Determining Difference in Electronegativity

Octet Exception D-Orbitals

Re: Fall 2013 Quiz Preperation Problem 10

Fall 2013 Quiz Preperation Problem 10

Re: How much of the atomic mass of an element should be used

How much of the atomic mass of an element should be used?