CHEMISTRY COMMUNITY

Bita Ghanei 1F

How do you know what is a metalloid based off of just looking at the periodic table?

Bita Ghanei 1F

To answer this question, draw the structures of the resulting anion (conjugate base) and evaluate the stability. To draw the lewis structure of the anion, draw the original lewis structure and erase an H and put a negative. The stronger acid creates the more stable anion. HClO2 is stronger than HClO...

Bita Ghanei 1F

AnayaArnold_3L wrote:How would we identify ligands?

ligands are the things bonded to the metal. Ligands donate electrons to make a bond.

Examples would be F-, H2O

Bita Ghanei 1F

He also went over transplatin in lecture, so I would know that too.

Bita Ghanei 1F

For LDFs, the higher molecular weight results in a higher boiling point (ie HI has a higher boiling point than HCl)
For dipole-dipole interactions, the greater difference in electronegativity has a higher boiling point

Bita Ghanei 1F

Can't the same metal have different oxidation states, though? Like Fe can be +2 or +3

Bita Ghanei 1F

for a-e on the 11/17 worksheet, what are the correct answers for the geometry and the hybridization?

Bita Ghanei 1F

What do we have to know about myoglobin and hemoglobin?

Bita Ghanei 1F

I'm pretty sure you always say cyano.

Bita Ghanei 1F

single bonds are longest and weakest, triple bonds are shortest and strongest

Bita Ghanei 1F

They are just different ways of explaining the same thing

Bita Ghanei 1F

The compound with more H's is the acid, the compound with the least # of H's is the base!

Bita Ghanei 1F

Even noble gasses, at very low temperatures, will condense to become liquids or freeze to become solid. At -200 degrees C, which is more likely to be a gas, Neon or Argon? Explain.

Could someone please provide the explanation for why Neon would be more likely to be a gas? Thank you!

Bita Ghanei 1F

For seesaw, it would just be <90 and <120
for T-shaped, it would only be <90

Bita Ghanei 1F

Solids have the highest inter molecular forces and gasses have the lowest. Liquids are inbetween in IMF strength.

Bita Ghanei 1F

If you are breaking the octet rule, you still want the formal charge to be zero if possible!

Bita Ghanei 1F

Is C2H5OC2H5 a polar or nonpolar molecule? How would you go about deciding this?
I think that it is polar because if we consider the central atom to be O, then all of the surrounding atoms are not the same.
Thanks in advance!

Bita Ghanei 1F

3F.1 Identify the types of attractive intermolecular interactions that might arise between molecules of each of the following substances: (a) NH2OH;(b) CBr4;(c) H2SeO4;(d) SO2. For C, H2SeO4, is the only reason that Hbonds are a valid answer because there is an O-H bond in the lewis structure AND an...

Bita Ghanei 1F

All molecules experience London dispersion forces as they all have a very tiny moment in time when their electrons move to one side of the atom and that side becomes slightly negative and the other side becomes slightly positive. It's just temporary attractions.

Bita Ghanei 1F

What is the relationship between boiling point and vapor pressure?

Bita Ghanei 1F

Could someone walk me through this problem?

3F.19 Account for the following observations in terms of the type and strength of intermolecular forces. (a) The melting point of solid xenon is
−112°C and that of solid argon is −189°C

Thanks in advance!

Bita Ghanei 1F

In HW Problem 3F.5 C, we are asked to determine whether CHI3 or CHF3 has a higher melting point. The answer is that CHI3 has the higher melting point because Iodine has a larger atomic radius and more electrons than F. In 2D, we learned that a C-F bond is more ionic than a C-I bond since longer bond...

Bita Ghanei 1F

I think the regular 3F and the focus 3F problems are a safe bet!

Bita Ghanei 1F

Does anyone know if we will be given a chart with the exact electronegativity values for atoms? Or should we have a general idea based on just looking at the atom's position on the periodic table?

Bita Ghanei 1F

Q: What is the maximum number of electrons that can occupy the orbitals with principle quantum number = 4?

A: 32

Can someone please explain why the answer is 32? Thanks!

Bita Ghanei 1F

If you are comparing Mg-O and B-O, would Mg-O be more polar because Mg has a smaller radius than B?

Thanks in advance!

Bita Ghanei 1F

Are there any other exceptions besides P, S, Cl, and the first 4 elements of the periodic table?

Thanks in advance!

Bita Ghanei 1F

In order for two resonance structures to be valid, do they have to have the same formal charges on all their atoms? Or do they have to sum up to have the same overall charge?

Thanks in advance!

Bita Ghanei 1F

Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?

Whoever posts the answers, could you please include the lewis structure drawings for 2A with the dipole moments included?
Does anyone know when to draw the dipole moments and which atoms to put them on?

Bita Ghanei 1F

If I am unable to attend the Early Quantum review tonight, will there be another midterm review session covering this topic?

Thanks in advance!

Bita Ghanei 1F

Do P, S, and Cl ALWAYS have to defy the octet rule? Is it only if they are the center atom in the lewis dot structure?

Thanks in advance!

Bita Ghanei 1F

If you have an ion with one atom having a +1 formal charge and another atom having a -1 formal charge, do these charges cancel each other out if there are only two atoms in the ion?

Thanks in advance!

Bita Ghanei 1F

When a problem asks for numbers of electron pairs (both bonding and lone pairs), are the asking for actual pairs or the individual dot numbers?

Ie would four lone electrons (individual dots) be considered 2 electron lone pairs?

Thanks in advance!

Bita Ghanei 1F

I'm pretty sure the homework corresponds to the content we are learning this week. I think only Chemical Bonds Hw is accepted. Please correct me if I'm wrong.

Bita Ghanei 1F

Michelle Nwufo 2G wrote:So, mass is always represented in kilograms and velocity in meters per second?

I believe this only holds true for the De Broglie Equation

wavelength in meters,
h in Js,
mass in kg
velocity in m/s

Please correct me if I am wrong.

Bita Ghanei 1F

The velocity of an electron that is emitted from a metallic surface by a photon is . (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches . How much energy is required to remove the electron from t...

Bita Ghanei 1F

From the following list of observations, select the one that best supports the idea that electromagnetic radiation has the properties of particles. Explain your reasoning. (a) Black-body radiation. (b) Electron diffraction. (c) Atomic spectra. (d) The photoelectric effect. I understand that D is the...

Bita Ghanei 1F

In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them together logical? Could someone please explain this ...

Bita Ghanei 1F

Identify the following elements as metals, nonmetals, or metalloids: (a) aluminum; (b) carbon; (c) germanium; (d) arsenic; (e) selenium; (f) tellurium.

How can you say for sure?

Bita Ghanei 1F

Which of the following subshells CANNOT exist in an atom:

(a) 2d
(b) 4d
(c) 4g
(d) 6f

How do I go about solving this problem? Thanks in advance!

Bita Ghanei 1F

According to Atomic Spectra, are electrons acting more as a wave or a particle? Please explain.

Bita Ghanei 1F

According to Atomic Spectra, are electrons acting more as a wave or a particle? Please explain.

Bita Ghanei 1F

According to Atomic Spectra, are electrons acting more as a wave or a particle? Please explain.

Bita Ghanei 1F

Will we ever have to square root n to find the value for an energy state?

Bita Ghanei 1F

If my topic is relating to Rydberg, can I create a new topic that is not listed under the board index for Quantum World? Where would be the most appropriate place to post something like this?

Bita Ghanei 1F

A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at . What is the minimum uncertainty in its position?

How do you solve for the change in velocity here? It seems as though we are not given enough information.

Bita Ghanei 1F

In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. What does 102.6 nm tell you here? I know uv light is n=1, but what am I mi...

Bita Ghanei 1F

Does anyone know how much sig fig answers are worth in the context of tests and exams? How many points will be deducted if sig figs are used incorrectly?

Bita Ghanei 1F

In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.

Could someone please walk me through the math here? Thanks!

Bita Ghanei 1F

Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. (a) The speed of the radiation decreases. (b) The wavelength of the radiation decreases. (c) The extent of the change in the electrical field at a given point decreases. (d) The energy o...

Bita Ghanei 1F

Will you be posting the worksheets and their answer keys weekly?

Thank you so much for making these!

Bita Ghanei 1F

Do 1.0003 and 0.0003 have the same number of sig figs? Could someone please clarify this? Thanks!

Bita Ghanei 1F

Hi there!
Could someone clarify the difference between accuracy and precision?

Bita Ghanei 1F

Are we expected to memorize polyatomic ions and their charges for Test 1? If so, which ones?

Bita Ghanei 1F

I tried looking through the syllabus, but I don't see a calendar. Does anyone know when/where Test #1 is? What topics will it cover?

Bita Ghanei 1F

I am interested in joining, as well! YRL also has really great study rooms :)

Bita Ghanei 1F

So this problem is asking us to determine the volume of the solution should be transferred into a flask in order to obtain 2.15 mmol of Na+ . Importantly, this is not a dilution problem. Therefore, we won't be using the M1V1=M2V2 equation. The molarity of the solution won't be changing when we tran...

Bita Ghanei 1F

So I purchased the textbook bundle that Dr. Lavelle recommended, I'm just not sure where I can find the solutions manual??

Thanks in advance!

Bita Ghanei 1F

Could someone please explain how to do the following problem? 5.00 g of KMnO4 is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with water, what is the concentration of the solution in the 2nd flask? Molar Masses: K...

Bita Ghanei 1F

When is 0 considered a significant figure and when is it not?
When do you round up or down if the number ends in 5?

Thanks in advance :)

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