CHEMISTRY COMMUNITY

Princess Jereza 3C

Is there a difference between using a single arrow or an equilibrium arrow in a chemical reaction between acids and bases? Does it all depend on the complete/incomplete deprotonation/protonation of hydrogen ions in a reaction? thanks

Princess Jereza 3C

To clarify, pi bonds are weaker than sigma bonds because of the sides overlapping, rather than overlap of the ends of a sigma bond (which are stronger). Does a pi bond break by rotation, or another chemical reaction that would break a double/triple bond? thanks

Princess Jereza 3C

How is CCl2H2 polar? I am reviewing Test 2, and I am pretty confused that CCl2H2 is polar, I answered it initially as nonpolar because wouldn't the dipoles cancel each other out?

Princess Jereza 3C

Amphoteric compounds are compounds with characteristics of acids and bases, and metals/metalloids can form amphoteric compounds with oxygen because they can possess different oxidation states. In 6A.17, As2O3 & Bi2O3 are amphoteric because of the arsenic and bismuth metals. I hope this helps!

Princess Jereza 3C

The coordination number of a complex is the number of points/binding sites at which the ligands are attached to the central atom. The ligands attached to the central atom make up the coordinate sphere of the central ion.

Princess Jereza 3C

In another way, we can see if there is a strong/weak acid or base present in the chemical reaction given, we can see if the reactant, let's say, an acid, is strong or weak based on the deprotonation of its H atoms in the chemical products shown, same thing with a reaction that has a base (protonati...

Princess Jereza 3C

In another way, we can see if there is a strong/weak acid or base present in the chemical reaction given, we can see if the reactant, let's say, an acid, is strong or weak based on the deprotonation of its H atoms in the chemical products shown, same thing with a reaction that has a base (protonatio...

Princess Jereza 3C

Strong acids and Strong bases, weak acids and strong bases, and strong acids and weak bases can occur/react in a neutralization reaction, but can weak acids and weak bases interact in the same way as the former compounds I mentioned, will it result in either a water molecule and/or salt just the sam...

Princess Jereza 3C

In relation to inorganic and organic compounds, inorganic acids are compounds that have an H in the beginning of the molecular formula, and that these acidic compounds will release their proton (H atom) in solution; in an organic acid, H atoms are written at the end of the carboxyl group -COOH, the ...

Princess Jereza 3C

As we near the end of Chem 14A and the final is next Sunday, may I ask how any of you will study for the final exam? I did not do so well on the midterm exam and I would like to do much better on this final exam as it will be worth way more than the midterm. Like what do you guys plan on studying an...

Princess Jereza 3C

To clarify, polydentates are ligands with multiple bonding sites because of their lone pairs, and because of those multiple binding sites, they can create chelates by forming a ring around the central metal atom. Do chelates form because the polydentate ligands attach themselves together (that is pr...

Princess Jereza 3C

To clarify, we use the bounded atoms of a molecule to identify the shape of a molecule, but we use the number of regions of electron density of an atom to identify its hybridization/hybrid orbitals?

Princess Jereza 3C

How can a molecule be nonpolar with polar bonds? Does it usually occur when molecules have the shape of a tetrahedral? thanks

Princess Jereza 3C

Is there a quicker way to find the hybridization of an atom without drawing a diagram? thanks

Princess Jereza 3C

Does the symmetry of a molecule, from the lewis structure, also help determine the polarity of a molecule? thanks

Princess Jereza 3C

During lecture, how does a shape of a molecule contribute to the strength of an interaction? And by shape, do we mean spherical or log shapes, and how far apart they are from another atom/molecule? thanks

Princess Jereza 3C

Does anyone know when Exam 2 will happen? Also, does anyone know if we are allowed to turn in homework from chemical bonds for week 7? Thanks.

Princess Jereza 3C

Adding on, yeah I believe that it's alright to just list the FC next to the atom on the lewis structure, as that's how Dr. Lavelle, the TA's, and the solutions manual would write the formal charges on a problem.

Princess Jereza 3C

Polarizability is the inclination of electrons to be distorted in an anion. Polarizing power is the ability of a cation to distort electrons of an anion. The size of cations are pretty small in comparison to the size of anions, since the radii of cations are small, their nucleus has enough pulling e...

Princess Jereza 3C

When drawing oxygen on lewis structures, we have seen examples, such as H2O and CH3CO2^-, that oxygen atoms are placed diagonally (not sure if that is the appropriate word to use), instead of balanced and in line with the central atom. Why is that?

Princess Jereza 3C

Why is the electronic configuration for the copper (I) oxide ion [Ar] 3d^10, and not [Ar]3d^94s^2? Is it because the valence electron in the s- subshell moves to the d subshell? I am not sure how that works.

Princess Jereza 3C

Also note that there are different test rooms for each lecture class, for those reading this post, look at the pdf on the Chem 14A page, and you will see which room you are in according to last names.

Princess Jereza 3C

So in my discussion class, a question and answer was given, and I was not able to understand the explanation. The question was "Which of the following subshells cannot exist in an atom?" The solutions were, A) 2d B)4d C)4g D)6f. The answers were A and C, why is that? Thanks

Princess Jereza 3C

For those who have attended the review sessions, how are the sessions formatted (I couldn't think of another way to say it), like was it basically just students asking questions and the UA/TA answers, or was there a worksheet given, etc.? Thank you, I plan on attending a review session soon, but I w...

Princess Jereza 3C

To add on, one of the best ways to reinforce the material into your head is to also watch the video modules and take the post assessments! They help me a lot, and of course, do the problems listed on the syllabus.

Princess Jereza 3C

Why do we use hydrogen as the central standard in understanding chemistry?

Princess Jereza 3C

Is there a specific definition or meaning when a problem asks the minimum uncertainty of a position or speed of a particle? How would we apply that number to an experiment or in a written sentence, if that makes any sense.

Princess Jereza 3C

Hi, so I had a question for the final answer on 1B.23, my final answer was 396 x 10^1 m/s, but the solutions manual said 3.96 x 10 ^3 m/s, are both answers are technically correct, right? Is it appropriate to leave my answer the way it was before? Thanks

Princess Jereza 3C

Does anyone know the conversion units in order to convert ounces into grams, and miles per hour into meters per second? thanks

Princess Jereza 3C

Are we supposed to learn the purposes and outcomes of experiments that are featured in the Quantum unit? It is heavily focused and talked about, and I have been just focusing on the formulas that are bolded in the textbook. I understand that we need to learn the purpose of the formulas, in order to ...

Princess Jereza 3C

Adding on to most of these replies, I am honestly still figuring out on the approach to study and truly learn the material. The biggest thing that has helped me is making flash cards (for me I have one flash cards) of putting down formulas, what their variables, and experiment means. It has helped o...

Princess Jereza 3C

Since we are dealing with calculating wavelengths of parts of this unit, is it more appropriate to leave our finals answers in nanometers, nm, or in powers of 10?

Princess Jereza 3C

You probably got confused because the solution manual said 2.998 x 10^8 m.s^-1, but in the textbook it says that the speed of light, c, is 3 x 10^8 m/s

Princess Jereza 3C

Not exactly a homework or concept question, but does anyone know where in the textbook or Dr. Lavelle's website where it can show a chart for SI units and their equivalent units. For example, I have numerously been searching up the base unit equivalent of Joule, and eV, etc. Is there a chart anywher...

Princess Jereza 3C

n are the levels in the atomic spectra of atomic hydrogen. Balmer and Lyman series detects lines of radiation in the spectra using hydrogen atoms, like visible light and ultraviolet radiation respectively.

Princess Jereza 3C

So for homework question 1A.15, the question is asking for the initial and final spectra lines (n), the spectra line was already given 102.6 nm. I know that we need to find the the frequency (v), by dividing the speed of light by 102.6 x 10^-9m, and I got 2.924 x 10^15. I am not sure how else to app...

Princess Jereza 3C

When I went to Dr. Lavelle's office hours last Friday, my friend and I asked about nomenclature (compound and formula naming) on the test, he said that the formulas will be written on the test, since we have not learned nomenclature as a class yet.

Princess Jereza 3C

Is it better to leave finals answers in powers of 10 or in whole numbers?

Princess Jereza 3C

I am a little confused on the units for avogadro's number, can we label the units for that number using moles, formula units, or atoms during a unit conversion, is it interchangeable. I apologize if this question sounds confusing. Thanks.

Princess Jereza 3C

When I was doing mole ratios in order to find a mass of a reactant, for reference we'll use the balanced equation 2K + H2 -> 2KH, why is the mole ratio of potassium and hydrogen gas (2 mol K)/(2 mol H2)? I am not understanding that hydrogen gas has two moles when the equation shows that hydrogen gas...

Princess Jereza 3C

I apologize for adding on to the initial question, but does anyone know if we will get points taken off of homework or exams if we do not put the state of matter next to the substances when writing a chemical equation?

Princess Jereza 3C

Kristina Rizo 3K wrote:In the formulas discussed above, what does the C mean? V = n/c and V(initial) = [C(final)V(final)]/C(initial)
Do the lower case c and upper case C represent the same thing?

I apologize for the notation there. Yeah the lower case and upper care represent the same thing, concentration.

Princess Jereza 3C

In the textbook, in example L.1 on F89, there was a step where a chemical reaction had to be balanced, which was Fe2O3 + CO -> Fe + CO2, and the balanced equation was Fe2O3 + 3CO -> 2Fe + 3CO2. I got stuck balancing it cause I got Fe2O3 + 2CO -> 2Fe + 2CO2, I knew something was wrong, but I did not ...

Princess Jereza 3C

What is the difference in using the two formulas for calculating the volume of a solution: V = n/c and V(initial) = [C(final)V(final)]/C(initial)? When is it appropriate to use either formula?

Princess Jereza 3C

Without giving out too much information, how does one find a mass of a product. So say that the molar mass is given for that product, and the molar masses of the reactants are given, what would the steps be in order to find a mass of a product. This may be too vague, but any help will do, thanks.

Princess Jereza 3C

I apologize that this may be an inappropriate time to post a question from the post-assessment module, but I am having trouble with this one question. So say Xylitol, which has 39.43% Carbon, 52.58% Oxygen, and 7.88% Hydrogen, and the molar mass is 152.15 g/mol, and I have to find the molecular form...

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