CHEMISTRY COMMUNITY

joanneyseung22

There is a category in identifying cations and their acidities in water which is revolved around weak Lewis acids. The textbook states that "cations of Group 1 and 2 metals, as well as those of charge of +1 from other group, are such weak Lewis acids that hydrated ions do not act as acids."...

joanneyseung22

There is a rule for naming that states that you used the Greek prefixes bis-, tris-, tetrakis-, etc. if the ligand already contains a Greek prefix. What does this mean, and is there an example that can be used so that I could better understand this concept?

joanneyseung22

How do you figure out oxidation numbers of the ligands inside of a coordination compound?
For example, in hexacyanoferrate(II) ion, or [Fe(CN)6]^4-, the CN's charge is -1 overall. However, in hexaamminecobalt(III) ion, or [Co(NH3)6]^3+, NH3's charge is 0. How can one figure all this information out?

joanneyseung22

Would anyone be able to explain the relationship between a polydentate and a chelate? The textbook says that "polydentate ligands can form chelates" but I'm not very clear on what that means.

joanneyseung22

In the 6th Edition of the textbook (page 740), there is a concept introduced called "substitution reaction." In this example, the textbook indicates that a substitution reaction is a "reaction in which one Lewis base takes the place of another," and they give an example of [Fe(OH...

joanneyseung22

Conceptually, how does resonance affect the strength of bonds? I'm not sure how resonance leads to the stabilization of a molecule when multiple-bond characteristics are spread over the bonds in different atoms.

joanneyseung22

In Section 3.12, the textbook focuses a lot on figuring out the differences in electronegativity, as well as figuring out the electronegativity given ionization energy and electron affinity. Are these concepts necessary for the upcoming test?

joanneyseung22

What is the significance of this following rule for the additional prediction of a VSEPR model? I need more clarification on what this rule is in regards to the strengths of repulsions.
- The strengths of repulsions are in the order lone pair-lone pair > lone pair-atom > atom-atom

joanneyseung22

How would we be able to calculate either the position or shape of an ion? I believe the textbook refers to them as different components to a VSEPR model.

joanneyseung22

What are the main differences between sigma-bonds and pi-bonds?

joanneyseung22

What is the difference between the polar and non-polar molecules in regards to dipole movement? I know in lecture, Professor Lavelle was talking about polar bonds that either cancel out dipoles or did not, but I was a little confused about the concept.

joanneyseung22

How could we explain why a bond angle is less than another given certain bond angle? For example, sulfite has 4 electron pairs arranged tetrahedrally and the bond angles are around 106 degrees - less than 109.5. What is the specific explanation for why this is so?

joanneyseung22

What is the importance of dissociation energy in bonds? I understand they are used to compare the strengths of a bond, but I wasn't so sure about why it was needed for ion-ion, ion-dipole, dipole-dipole, or dipole-induced dipole forces.

joanneyseung22

In Dr. Lavelle's lecture, I wrote down that "interionic and intermolecular attractive forces are responsible for the condensed phases (liquid/solid)." Would anyone be able to explain what that means, maybe with an application or example?

joanneyseung22

As a follow up question: Do we need to know how to figure out the bond angles with lone pairs attached to the central atom? I know that there are pretty simple bond angles that we can memorize, like 180 degrees or 109.5, but I was wondering how that changes once there is a central atom with a lone p...

joanneyseung22

What is the importance of oxidation numbers in relation to the ionic character of bonds? I was confused as to what the textbook was saying when it said that it "exaggerates the ionic character of bonds." Also, do we need to know that oxidation numbers when figuring out the formal charge in...

joanneyseung22

How do find the number of electrons when the question gives us quantum numbers (for example, n=3, l=1)? I think I understand the concept, but I just needed some clarification to make sure.

joanneyseung22

So in this question, we are asked to find the electron configuration for Cu+. I originally thought that the answer was [Ar]4s^2,3d^8, but I found that the answer was [Ar]3d^10. Another post's reply stated that "2 electrons from the 4s shell move to the 3d shell in order to make the answer."...

joanneyseung22

Can someone please explain this octet rule guideline: "the valence of an atom is equal to the number of covalent bonds?"

joanneyseung22

For the example given in class, there was an example of a polyatomic species of ammonium sulfate. I understood how the Lewis Structure was created for sulfate, but I am not quite sure how to structure the valence electrons for ammonium. I understand that there are a total of 9 valence electrons and ...

joanneyseung22

I just needed some clarification on Professor Lavelle's lecture notes because I am not quite understanding the concepts between the examples of cations and anions. For example, Professor Lavelle used Indium as an example for a cation. In = [Kr](4d^10)(5s^2)(5p^1), and In+= [Kr](4d^10)(5s^2). In this...

joanneyseung22

I had the same question! For example, in section 2.1, they start talking about the Coulomb potential energy in relation to the Schrodinger equation, which Professor Lavelle said was not necessary to know for this upcoming test. I am confused on what to focus on for this test as well - knowing which ...

joanneyseung22

For this question, I was just wondering about the specific units for Planck's constant and speed of light. Is the unit for Planck's constant J.s and the unit for speed of light m.s-1? If so, what is the difference between m.s-1 and m.s, as well as J.s and J?

joanneyseung22

For this textbook problem, it asks us to fill in the blanks for the missing portions of a chart (frequency, wavelength, energy of photon, and event). When I was comparing my answers, I didn't really know how to find the "event" of the corresponding frequencies and wavelengths in the chart....

joanneyseung22

Question states that "Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 1015 s-1 before it can emit an electron from its surface. If molybdenum is irradiated with 194 nm light, what is the maximum possible kinetic energy of the emitted electrons?" How do you calcula...

joanneyseung22

I have a follow-up question that is related to this previous question: what is the relationship between the Stefan-Boltzmann law (total intensity = constant x T^4) and Wien's law (TAmax = constant)? I'm confused as to how these laws are related when we are talking about inverse proportionality and t...

joanneyseung22

Will it be useful for the test to know the concepts behind how each experiment or equation became used in the quantum world? For example, like the experiments regarding J.J. Thompson, Robert Millikan, Geiger-Marsden, Rydberg constant, etc.

joanneyseung22

Does anyone know if the units for a wavelength are in nm or m? In example 1.1, they converted the final answers of the wavelengths from m to nm, and I am not exactly sure what the tests will be looking for.

joanneyseung22

When looking at the given numbers and units, I thought that I could use the formula m = Mn (m is mass, M is molar mass, and n is the amount in moles). However, I got an answer that was totally different from the solution manual. Could anyone explain why you need to divide the 2.39*10^20 formula unit...

joanneyseung22

I am confused about how we would know that O4 is part of magnesium sulfate? Unless I looked it up, I wouldn't have known.
Are there certain suffixes and prefixes that are pertinent to the first exam regarding the review topics? Like -ate, -ite, -ide, etc.

joanneyseung22

I have been reading the 6th edition of the textbook, and I have been confused about some of the explanations regarding units of molarity. For example, in the equation N = nNa, does the N represent the number of atoms? It specifies that it is the "# of objects," but it is kind of throwing m...

CHEMISTRY COMMUNITY

Search found 31 matches

Weak Lewis Acids

Bis, Tris, Tetrakis, etc.

Oxidation Numbers

Re: Chelate

Substitution Reaction

Determining Bond Strength with Resonance

Difference in Electronegativity

Strengths of Repulsions

Difference Between Position and Shape

Types of Bonds

Polarity in Molecule

Angles Less Than a Certain Value

Importance of Dissociation Energy

Interionic/Intermolecular Forces

Re: Bond Angles

Importance of Oxidation Numbers

Electrons in Orbitals

6th Edition, Question 3.5

Octet Rule Guideline

Lewis Structures with Polyatomic Species

Cations/Anions

Re: Textbook Reading

Units for Problem #1.25 (6th Edition) [ENDORSED]

6th Edition: Problem 1.9

Module Post Assessment #34B

Re: Stefan-Boltzmann and Wien's law

Experiments and Equations

Units for Wavelength

6th Edition, Question E.25b

Re: E.9 on homework

Clarification on Units (Moles)