CHEMISTRY COMMUNITY

April Meza 3K

If there is a jump in energy levels then the light is absorbed. if there is a drop in energy levels then the light is emitted.

April Meza 3K

Amphiprotic is losing and gaining an electron, while amphoteric is being able to act as an acid and base.

April Meza 3K

Incomplete octets can be formed because there are certain atoms of certain elements that can exist in stable compounds, thus forming bonds with less than 8 valence electrons.

April Meza 3K

The answer should have the same number of sig figs as the number (of sig figs) in the question.

April Meza 3K

By determining the regions of electron density and then make orbitals with this number in mind.

April Meza 3K

An acid donates a proton, while a base accepts a proton.

April Meza 3K

Single bonds are sigma bonds but they can also exist in double and triple bonds.

April Meza 3K

Organic ones contain carbon, while inorganic ones do not contain carbon.

April Meza 3K

I think its best if we know them. Just to be safe!

April Meza 3K

Inorganic acids don to have carbon and organic acids do contain carbon.

April Meza 3K

Yes I think that the coordination number is the number of bonds on the central atom.

April Meza 3K

The higher the electronegativity the stronger the bond. When the bond is stronger is shorter.

April Meza 3K

The final is cumulative and regarding test 2, I believe we'll be getting that back during discussion.

April Meza 3K

I hope this is helpful! The two outer ones are pi bonds and the center one is a sigma bond.

April Meza 3K

They are the various ways that a lewis structure can be drawn.

April Meza 3K

They are used to determine the number of times a single ligand attaches to the central metal.

April Meza 3K

You can find hybrid orbitals by looking at the lewis structure.

April Meza 3K

I would look at outlines 3 and 4!

April Meza 3K

Drawing the lewis structure can be really helpful if you're not completely sure and want to be safe!

April Meza 3K

Yes, the difference in electronegativity can cause a dipole moment.

April Meza 3K

All material that was not on the midterm and up until this point.

April Meza 3K

Here is an example of a dipole-dipole moment.

April Meza 3K

Yes, we need to know them.

April Meza 3K

London refers to London forces. It's an intermolecular force and the weakest.

April Meza 3K

This is an example of a dipole moment. The arrow is pointing towards the atom with a partial negative charge.

April Meza 3K

Yes. The trends for ionization energy, electron affinity and electronegativity are the same.

April Meza 3K

The length of a bond is determined by the number of bonded electrons. The higher the bond order then the stronger the pull between the two atoms and the shorter the bond length.

April Meza 3K

Dipole moments are temporary as they are areas where an electron(s) can be found.

April Meza 3K

Tyler DeWitt and Organic Chemistry Tutor are really great!

April Meza 3K

I believe it is 4 orbitals.

April Meza 3K

Ohh okay thank you so much!!

April Meza 3K

Does anyone know if Dr. Lavelle's sessions tomorrow will all have the same past exam questions in all three sessions? Or will they be different in each session? Thanks in advance!

April Meza 3K

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

April Meza 3K

We should base our sig figs based on the number of sig figs given in the question.

April Meza 3K

Typically the structure with the most charges on the atoms closest to zero is the more stable lewis structure. Hope this makes sense!

April Meza 3K

In shorter bonds, there is more electrons closer to the nucleus. This proximity makes it so you need more energy to brake the bond. This is why shorter bond lengths are stronger.

April Meza 3K

The longer the bond length, the weaker the bond is and the shorter the bond length, the stronger the bond is.

April Meza 3K

I am pretty sure it is only from metal to nonmetal.

April Meza 3K

The way to know electronegativity is through the periodic table. Electronegativity increases as you move to the right and it decreases as you go down the periodic table.

April Meza 3K

The x, y, z are used to be more specific than the s,p,d,f orbitals. It helps categorize the electrons into their subsets in an orbital.

April Meza 3K

I believe the numbers represent the length of the bonds. As for delocalized electrons, that means that electrons in a molecule are not associated with a single atom or covalent bond.

April Meza 3K

Is the next homework assignment only on the chemical bonds section?

April Meza 3K

Thank you so much!!!

April Meza 3K

Can someone share the password that we need to use in order to access the class website? Please and thank you!

April Meza 3K

Can someone explain the importance of the d-block when doing electron configurations? Please and thank you!

April Meza 3K

Can someone explain the Schrodinger equation and how to know when we need to use it?

April Meza 3K

He said that we were not going to cover black bodies so I wouldn't worry about it.

April Meza 3K

Crash course videos, the organic chem tutor, and Tyler DeWitt are some good channels. They are straight forward and really helpful!

April Meza 3K

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km.s2^-1. (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 2.50 3 1016 Hz. How much energy is requir...

April Meza 3K

I'm sure that if we are given the equations we are then expected to know what the variables mean and how to use them to solve the problems.

April Meza 3K

State the hybridization of the atom in boldface red type in
each of the following molecules and ions: (a) Be Cl 2 ; (b) B H 3 ; (c) B H 42 ; (d) Si F 4 .

Can someone explain how I would complete this? Thanks!

April Meza 3K

In the wave of properties of electrons Lecture diffraction was mentioned. Dr. Lavelle mentioned that light waves in general show diffraction patterns. I am confused as to what exactly diffraction patterns are. Can someone please explain? Thanks!

April Meza 3K

Thank you!

April Meza 3K

A lamp rated at 32 W (1 W 5 1 J*s) emits violet light of
wavelength 420 nm. How many photons of violet light can the
lamp generate in 2.0 s? How many moles of photons are emitted
in that time interval?

Can some explain how I would approach this question? Thanks!

April Meza 3K

Do we have to have the 5 posts by today or if we post Sunday will they still be counted?

April Meza 3K

Thank you, these are really helpful!

April Meza 3K

The camel stores the fat tristearin, C 57 H 110 O 6, in its hump. As well as being a source of energy, the fat is also a source of water because, when it is used, the reaction 2 C57H110O6(s) + 163 O2(g)---> S 114 CO2(g) + 110 H2O(l) takes place. (a) What mass of water is available from 1.00 pound (4...

April Meza 3K

Does anyone know if we're supposed to write our homework in pen? Or is that just for tests?

April Meza 3K

(b) Mg(N3)2(s) + H2O(l) ---> Mg(OH)2(aq) + HN3(aq)

Can someone explain how to balance this equation? I get stuck after a few steps. Thanks!

April Meza 3K

Since the diameter is twice the radius, 144pm (the radius that is given) is multiplied by 2. That would be 288pm.

April Meza 3K

Thank you! This really helps!

April Meza 3K

I really like the way topics are explained on KhanAcademy and crash course! They are straight forward and after a few videos, they give examples for you to do.

April Meza 3K

Abbey Brandt 4E wrote:The best rule I can give you is to use the least specific number of sig figs used in the question itself. For example, if in the equation there are measurements including the digits 4.98, 5.667, and 0.2, you would use 1 significant figure. Does that help?

Yes, it does. Thanks!

April Meza 3K

Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. (a) How many atoms of oxygen are in 5.15 g of Epsom salts? (b) How many formula units of the compound are present in 5.15 g? (c) How many moles of water molecules are in 5.15 g of Epsom salts? I am not sure how to go about thi...

April Meza 3K

Okay, thank you!

April Meza 3K

How do I know when I need to round? For instance, if I were to use Lithium, which is 6.94, would it be that exact number or can I round to 7?

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