CHEMISTRY COMMUNITY

Akshay Chellappa 1H

Lyndon showed us that you can draw a circle around one of the atoms and count everything within the circle, any loan pair electrons and the bonded electrons (the circle breaks any bond in half so just count like 2 instead of 4 if there is a double bond), and subtract that from the number of valence ...

Akshay Chellappa 1H

Akshay Chellappa 1H

No, I do not believe so

Akshay Chellappa 1H

You only add -ate to the end when the complex is negatively charged.

Akshay Chellappa 1H

A lewis acid is an electron acceptor and a Bronsted acid is a proton donor. A Bronsted acid or base is always either a lewis acid or base, but some Lewis acids and bases are not considered to be Bronsted.

Akshay Chellappa 1H

Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A: A ferrous wheel.

Akshay Chellappa 1H

Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe

Akshay Chellappa 1H

Q: Anyone know any jokes about sodium?
A: Na

Akshay Chellappa 1H

Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.

Akshay Chellappa 1H

Q: Why do chemists like nitrates so much?
A: They're cheaper than day rates.

Akshay Chellappa 1H

A Bronsted acid is a proton donor and the base is a proton acceptor

Akshay Chellappa 1H

Transition metals also always have valence electrons in at least two shells instead of just one

Akshay Chellappa 1H

A polydentate ligand can be recognized if it has more than 2 lewis base sites.

Akshay Chellappa 1H

I think you can just find the pOH, which just uses the same equation as finding the pH, and then subtract that value from 14.

Akshay Chellappa 1H

To find the pH you take the negative log of the hydrogen ion concentration of a solution.

Akshay Chellappa 1H

A polydentate ligand can be recognized by having more than 2 lewis base sites, such as multiple lone pair donating sites used to bond to a central atom or ion.

Akshay Chellappa 1H

In addition, a compound is diamagnetic if it only contains paired electrons and is not attracted to a magnetic field.

Akshay Chellappa 1H

Bond order is the difference between the number of bonds and anti-bonds.

Akshay Chellappa 1H

I believe that this was a reference to Chromium(III) picolinate, which is a coordination compound.

Akshay Chellappa 1H

Electron geometry describes the arrangement of electron groups whereas molecular geometry describes the arrangement of atoms, excluding lone pairs.

Akshay Chellappa 1H

I think we'll be asked to draw the lowest energy Lewis structure and then name the shape and what the bond angles are.

Akshay Chellappa 1H

VESPR is a model used to predict the geometry of molecules based on minimizing the electrostatic repulsion of a molecule's valence electrons around the central atom.

Akshay Chellappa 1H

It'd probably be best to focus on problems from Outline 4 for this week, especially because the content from there will make up the majority of this weeks test.

Akshay Chellappa 1H

Yes, I think that we are supposed to have the bond angles memorized for this test.

Akshay Chellappa 1H

The test should be in your discussion section this week.

Akshay Chellappa 1H

Ionic forces have the greatest impact on boiling point.

Akshay Chellappa 1H

Although hydrogen bonds are one of the strongest intermolecular forces, ionic and covalent bonds are still stronger.

Akshay Chellappa 1H

This is because hydrogen bonding allow proteins to bend, fold, and fit into various shapes as necessary which determines the protein's biological activity.

Akshay Chellappa 1H

Dispersion forces are present between all molecules, whether they are polar or nonpolar. All molecules have dispersion forces because to have a dispersion force a molecule needs electrons, and since all molecules have electrons all molecules have dispersion forces.

Akshay Chellappa 1H

Resonance structures are two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure.

Akshay Chellappa 1H

The main difference is that electron affinity gives the amount of energy released when an atom gains an electron while ionization energy is the amount of energy required to remove an electron from an atom.

Akshay Chellappa 1H

The magnetic quantum number describes the orbitals available within a subshell.

Akshay Chellappa 1H

I believe that you only need to solve for formal charge if the question asks you to find the lowest energy lewis structure. I believe you wouldn't need to find the formal charge for compounds such as methane, ethane, and some of the other alkanes because they consist of single bonds and there aren't...

Akshay Chellappa 1H

From the chemistry review session on Friday one of the UA's showed us that you can draw a circle around one of the atoms and count everything within the circle, any loan pair electrons and the bonded electrons (the circle breaks any bond in half so just count like 2 instead of 4 if there is a double...

Akshay Chellappa 1H

From the youtube video that I watched on this it seems that the hydrogen atom bonds with the outermost oxygen atom because H is bonding with the polyatomic ion ClO3 to form an acid.

Akshay Chellappa 1H

I think that if the question specifically asks to find the Formal Charge it would be better to write out the full formula. If the question just asks to draw the lowest energy Lewis structure it'd probably fine to do Lyndon's method.

Akshay Chellappa 1H

This is because as shells fill up, more shells are added and the outermost electron becomes even more distant from the nucleus, which lowers the ionization energy because it is easier to remove that electron.

Akshay Chellappa 1H

I believe that each atom would have a maximum of 6 dots as the single bond that connects the atom to the central atom would make up for the other 2 valence electrons.

Akshay Chellappa 1H

Formal charge is the charge which is assigned to an atom in a molecule. To calculate formal charge you add the number of lone pair electrons to half of the number of bound electrons, and subtract the sum from the number of valence electrons.

Akshay Chellappa 1H

A kekule structure is a Lewis structure in which bonded electron pairs in covalent bonds are represented with lines.

Akshay Chellappa 1H

The inert-pair effect is the tendency to form ions two units lower in charge than expected from the group number; it is most pronounced for heavy elements in the p-block. An example of the inert-pair effect is Helium.

Akshay Chellappa 1H

The units for ionization energy are kilojoules per mole.

Akshay Chellappa 1H

I believe that 5s is filled before 4f.

Akshay Chellappa 1H

When converting from ounces to grams: 1). Convert into pounds (1 lbs = 16 oz) 2). Convert from pounds to kilograms (2.2 lbs = 1 kg) 3). Convert from kilograms to grams. When converting from miles per hour into meters per second: 1). Convert from miles to meters (1mi = 1609.34m) 2). Convert from hour...

Akshay Chellappa 1H

This is because s-block metals usually have lower ionization energies when compared to p-block metals. With this low ionization energy, s-block metals tend to form cations, because they are more willing to give their electrons away, are are thus more reactive.

Akshay Chellappa 1H

I don't know how you get 2.99mL based off of the values that you provided, but I was able to get 3.06mL. I believe that your mistake was that you divided by 1000 instead of multiplying by 1000 when converting from L to mL.

Akshay Chellappa 1H

The steps for solving 5a were: 1). Convert the grams of aspirin provided, in my case it was 12.0g but I think the tests were different for each discussion, to moles by dividing by the molar mass. 2). Convert the mL of of ethanol provided to L by dividing by 1000. 3). Finding the molarity by diving t...

Akshay Chellappa 1H

The atomic radius of an atom is found by measuring the distance between the nuclei of two touching atoms. I believe that the atomic radius increases from right to left and from top to bottom on the periodic table.

Akshay Chellappa 1H

Did you remember to convert your final answer from Liters to Milliliters?

Akshay Chellappa 1H

Because you are multiplying s^-2 by s in the numerator you need to add their exponents, in this case -2 and 1, which leaves you with s^-1. This is also canceled out because you are dividing by s^-1, which means you need to subtract -1 from -1, which ultimately leaves you with 0 and cancels out secon...

Akshay Chellappa 1H

The constant h is Planck's constant. Planck's constant is equal to 6.626*10^-34 J*s, and it is also used when finding the energy of light in the equation E=hv.

Akshay Chellappa 1H

P is the variable assigned to Momentum. To find P, you need to multiply mass and velocity together. The units for P are kilogram meter per second, kg*m/s.

Akshay Chellappa 1H

I believe that E=(hc)/lambda is the equation used to find the energy of a Photon. Dr. Lavelle probably added the equations to show us how the final equation was initially derived.

Akshay Chellappa 1H

I think the easiest way to differentiate between nu and velocity would to just memorize all of the ways that one of the two can be applied in chemistry. So far, I think we've only seen velocity used to calculate momentum for De Broglie's Wave Equation. As we move through the quarter it might be a go...

Akshay Chellappa 1H

Notation is written by increasing energy, so maybe because the d-orbital is not completely filled it actually has a lower energy level than the s-orbital.

Akshay Chellappa 1H

I believe that Nitrogen is found in caffeine so when burned it is released as a gas.

Akshay Chellappa 1H

I don't think they have to be too detailed as long as your work is clear and easy to follow. However, I feel like it's better to have a more detailed dimensional analysis so that you can check your own work.

Akshay Chellappa 1H

What did you calculate as the mass of AlCl3 produced based on the 535 grams of Cl2? For percent yield you would need to divide the actual yield, 300grams of AlCl3, by the theoretical yield, your calculation, and multiply that by 100.

Akshay Chellappa 1H

I believe that Planck's constant is used when calculating the energy of a photon. It is represented by the variable h in the equation E=hv.

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