CHEMISTRY COMMUNITY

Eduarda Diniz 2B

Oxygen double bonded to something or single bonded to two other atoms has a 0 formal charge, whereas a single bonded to one atom oxygen has a -1 formal charge.

Eduarda Diniz 2B

hi! we have to see if there is any dipolar resulting moment in the molecule. For example, if all bonded atoms are the same there won't be a resulting polar moment because the atoms have the same electronegativity. However, if there is a different atom there will be. Lone pairs can also influence pol...

Eduarda Diniz 2B

hi! We have to memorize them! However, we have to understand a little bit of the reasoning behind it. For example, in a linear shape, we have two bonds. The farthest the two atoms can be from each other so their electrons' energy of repulsion reaches the lowest number is if we put them 180º distant ...

Eduarda Diniz 2B

listening to music really helps me

Eduarda Diniz 2B

This is really helpful! Thank you so much!!

Eduarda Diniz 2B

hahaha that's so good!

Eduarda Diniz 2B

pH=-log[h+]

Eduarda Diniz 2B

Hi! I am from Brazil, so I am visiting my family there during winter break!

Eduarda Diniz 2B

they are the same thing!

Eduarda Diniz 2B

Hi! So, when we have sp hybridization we have a linear shape (180º) When we have sp2, in COH2 for example, we have a trigonal planar shape and 120º angles In CH4, for example, sp3 hybridization has a tetrahedral shape and 109.5º angles. We can see that as we have a higher p character we decrease the...

Eduarda Diniz 2B

Thank you!

Eduarda Diniz 2B

Amphoteric molecules are the ones that can have both acidic and basic characteristics.

Eduarda Diniz 2B

I keep in my mind that strong acids are:
HCl, HBr, and HI + oxoacids that have the number of O - number of H = or > than 2

strong bases are bases that have the cation from the IA and IIA groups.

Eduarda Diniz 2B

We can treat H3O+ and H+ as being the same thing. It's important to know though that H3O+ is the proton combined with a water molecule

Eduarda Diniz 2B

I would say it is risky to think like that. For example, Acetic acid, CH3COOH, at first seems to have an OH, in the end, however, this OH is a part of carboxyl, COOH a functional organic group that gives the molecule an acidic characteristic.

Eduarda Diniz 2B

Hi Matthew! Are you going to post the answers for week 8?

Thank you!

Eduarda Diniz 2B

Trigonal pyramidal has 1 lone pair and 4 electron groups while T-shape has 2 lone pairs and 5 electron regions

Eduarda Diniz 2B

E = lone pairs in the central atom only

Eduarda Diniz 2B

Sigma bonds are formed by head-on overlapping of hybrid orbitals (along the bonding axis) while Pi bonds are formed by side-to-side overlapping of hybrid orbitals (above and below the bonding axis).

Eduarda Diniz 2B

Brazilian musical genres samba and pagode

Eduarda Diniz 2B

covalent bond multiplicity: the higher the number of bonds, the stronger the bond, and thus the higher the covalent bond dissociation energy; e.g.: triple bonds have higher dissociation energy than single bonds atomic radius: the larger the atomic radius, the weaker the interaction between the atoms...

Eduarda Diniz 2B

watch a movie and play sports!

Eduarda Diniz 2B

prisoner!

Eduarda Diniz 2B

hi! a covalent bond is coordinate when both of the shared electrons come from a single atom, instead of being provided each by a different atom

Eduarda Diniz 2B

Hi! When we are talking about ionic bonds, we are talking about atoms that lose/gain electrons when bonded together, whereas in covalent bonds we are talking about atoms that share electrons. Therefore, even though polar covalent bonds have a difference in the electron density, we are talking about ...

Eduarda Diniz 2B

hi! Atomic radius decreases down a period because the atomic number increases down a period, whereas the atomic radius increases down a group because the number of levels increases

Eduarda Diniz 2B

Diddy Riese and BJ's Restaurant & Brewhouse

Eduarda Diniz 2B

I love Harry Potter! I really recommend reading the books if you've only watched the movies!

Eduarda Diniz 2B

Thank you so much for sharing this! It was really helpful!!

Eduarda Diniz 2B

I find handwriting to be very effective

Eduarda Diniz 2B

Hi, Matthew.

I had to leave the last session early, so I missed some of the answers.

Are you going to put the answer key here?

Thank you

Eduarda Diniz 2B

once you know delta v, you insert this value on the equation and change delta p to m x delta x.

Eduarda Diniz 2B

Go back to Brazil to visit my family!

Eduarda Diniz 2B

Hi. The ml quantum number shows the orientation of an orbital. It can be referred to as orbitals. The ml value of an electron can be a number from -l to +l. For example, if l=1, the ml values can be -1, 0 and +1.

Eduarda Diniz 2B

As As you go down the periods, the number of shells increases. Therefore, you get electrons further from the nucleus, so the radius also increases.

Eduarda Diniz 2B

Hi!

B is incorrect because l = 0. ml value is given by +l to -l. For example, if l = 1, then ml = -1,0,+1. Once l = 0 in b, ml can only be = 0.

Hope it helps!

Eduarda Diniz 2B

some books will write it like -1,0,+1 while others will write as +1,0,-1, so there's not a rule for it

Eduarda Diniz 2B

netflix, naps, soccer, music

Eduarda Diniz 2B

we usually use the letters x, y, z to refer to the orbitals in the p subshell, like px, py or pz

Eduarda Diniz 2B

you can actually fill all of them up and then down or all of them down first; there isn't a rule on which you have to do first. Also, yes, +1/2 is up, and -1/2 is down

Eduarda Diniz 2B

Professor Dave Explains

Eduarda Diniz 2B

https://www.smithsonianmag.com/science- ... 180978780/

"This Molecule Could Be the Key to Understanding Why Concussions Have Such Long-Term Effects"

Eduarda Diniz 2B

Hi. When we say that intensity is related to amplitude we are thinking of light as a wave. On the other hand, when intensity means density of photons we are thinking of it as having particles' properties. Hope it helps!!

Eduarda Diniz 2B

Hi Sami!

So v in the E=hv equation does not mean velocity. It means frequency. They are never interchangeable. v in this question is not v from velocity. It's the Greek letter v (pronounced nu) which also means frequency. Be careful!!

Eduarda Diniz 2B

The series (Balmer, Lyman etc) show the lights emitted when an electron goes from a X energy level to n1. The n1 will depend on the series we are talking about.

Lyman: n1 = 1
Balmer: n1 = 2
Paschen: n1 = 3

Eduarda Diniz 2B

Melhor eu ir by Grupo Menos e Mais

Eduarda Diniz 2B

Greys Anatomy and The Ranch

Eduarda Diniz 2B

A Brazilian song called Eva from Banda Eva

Eduarda Diniz 2B

steak and fries!!

Eduarda Diniz 2B

Thank you for the advice :)))

Eduarda Diniz 2B

Hi. In order to find a volume when we have the molarity we have to use the formula: molarity = number of moles/volume If they give us the mass of the compound, we have to divide it by the molar mass, then finding the number of moles. Now, we can manipulate the formula above to have: volume = number ...

Eduarda Diniz 2B

Why did the white bear dissolve in water? Because it was polar!

Eduarda Diniz 2B

Two chemists walk into a bar. One tells the bartender, "I'll have an H2O." The other says, "I'll have an H2O too!" The second chemist dies.

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