CHEMISTRY COMMUNITY

Jocelyn Fermin1J

respiratory acidosis is when the ph of blood becomes acidic and this is because there is excess Carbon dioxide in the Lungs.

Jocelyn Fermin1J

is the number of orbitals of a subshell s= 0 p= -1,0,1 d=-2,-1,0,1,2 f=-3,-2,-1,0,1,2, -3 a) so you got 5d you look at the angular momentum quantum number= 2 (which is d) the d subshell can have 10 electrons, but we can pair these electrons together. Therefore, you have 5 different available orienta...

Jocelyn Fermin1J

Angular is another way of saying bent

Jocelyn Fermin1J

I found a video that is very helpful. The last few examples they do are irrelevant for this course since we didn't go over pka or ka in depth. Hope it helps!
https://www.youtube.com/watch?v=PdqFSw_SRug

Jocelyn Fermin1J

no, we did not cover this in class

Jocelyn Fermin1J

I understand how to calculate hybridization, but I don't understand what it means. Can anyone help? A simple way you can think of Hybridization is where two orbitals are coming together to create a new atomic orbital to fit all the number of electrons. In terms of the final, I believe Lavelle will ...

Jocelyn Fermin1J

The number of atoms attached to the central atom, this does not include lone pairs. double bonds and triple bonds only count as 1 for example

SO2 coordination number=2

Jocelyn Fermin1J

the solid and dotted lines are to represent the tetrahedral shape. Where the solid lines are representing that the N atom is sticking out. The dotted line represents the N going toward the back. Coordination number is the number of atoms/molecules the central atom is holding on to. In this case Fe i...

Jocelyn Fermin1J

Jordanmarshall wrote:so what is the difference between Bronsted acid and bases vs Lewis acids and bases?

this website helped me out a bit:

http://leah4sci.com/arrhenius-bronsted- ... chemistry/

hope it will too!

Jocelyn Fermin1J

I believe we will have to identify the Bronsted acid/base and Lewis acid/base in reactions, but not through their name. For J1 you can create your own reaction since they are in a solution of water. ex HNO3 + H20 -> NO3^- + H30^+ acid base conjugate base conjugate acid Therefore, HNO3 is a Bronsted ...

Jocelyn Fermin1J

Yes, that is correct. It would also be T-shaped because of the arrangement of the 2 lone pairs. (:

Jocelyn Fermin1J

an example would be:

HNO3 + HPO4^2- -> NO3^- + H2PO4^-
acid + base conjugate base + conjugate acid

HNO3 -H^+ =NO3^-
HPO4^2 +H^+ = H2P04^-

Jocelyn Fermin1J

For VSEPR, when you're trying to determine the shape based off of the # of regions of electron density, would you count a double bond as ONE region of electron density or TWO regions of electron density? And would you only count the number of regions of electron densities around the central atom to...

Jocelyn Fermin1J

Hi Husnia,
Right! The double bonds are the reason for smaller bond angles (103 degrees). The P-O bond needs more space so it causes the P-CL bonds to move closer together to reach 103 degrees.

Jocelyn Fermin1J

Lavelle won't cover this, but a quick description is: if one side of a reaction falls out of equilibrium due to a variety of changes(temp, concentration etc.), the counter side (the side that did not get affected by the change) will try to match the side that did fall out of equilibrium, which will ...

Jocelyn Fermin1J

June 4th

Jocelyn Fermin1J

June 1st

Jocelyn Fermin1J

Hi Melissa, I believe it is because sigma bonds can't overlap one another. There can be 2 Pi bonds because they are 90 degrees from each other and don't overlap and just a reminder to follow these rules too: single covalent bond has -1 sigma bond Double covalent bond has- 1 sigma bond and 1 pi bond ...

Jocelyn Fermin1J

Hi Hussein,
ClO2+ does have a bent shape because of the lone pair, but the arrangement of molecules around the chlorine makes it a trigonal planar.
hope this helps!

Jocelyn Fermin1J

Also, the VSEPR model is used for predicting the molecular geometry.

Jocelyn Fermin1J

A t.a told me to be mindful of the electronegativity but we don't have to memorize it.

Jocelyn Fermin1J

Endri Dis 1J wrote:Can someone give an example of a polar covalent bond?

Hi Endri,
here is one:
C-Cl, Carbon has an electronegativity of 2.5 and Chlorine has an electronegativity of 3= 0.5 which is a polar covalent bond between the two.

Jocelyn Fermin1J

Do all covalent bonds have dipole nature or are some covalent bonds, like C-H, so similar in electronegativity that they do not have any dipole nature? Where is the cut off if this is the case? Hi Noah, I believe in order to have an electric dipole movement one of the rules is that the molecule has...

Jocelyn Fermin1J

When given a formula with a charge, how do we know which atom to apply the charge to? Hi Victoria! Is this what you mean, if there was a charge on a molecule such as a tetrahydroborate ion- BH4^- or otherwise known as [BH4]^- you give the charge to the whole molecule so: Boron has= 3 electrons Hydr...

Jocelyn Fermin1J

I assume that the radical would go onto the atom that needs it to either fill an octet or to create a formal charge of 0.

Jocelyn Fermin1J

If you're given a list of elements such as K and Cl H and O Al and Mg K and Na how do you tell which elements will most likely form a covalent bond? These are the bonds I got after doing the calculations, Please correct me if I am wrong! K and Cl=ionic bond H and O = covalent bond Al and Mg= covale...

Jocelyn Fermin1J

NabilaNizam-1K wrote:Does the formal charge of the central atom affect the overall charge of the molecule?

If the central atom happens to be anything below or above 0, then it will affect the overall charge of the molecule.

Jocelyn Fermin1J

If there is a metal involved in the formula when calculating the electronegativity and the answer is between 1.5-2.0 then it is ionic. If a nonmetal is involved and the electronegativity is between 1.5-2.0 it is polar/covalent. Why is the bond polar/covalent for nonmetals and ionic for metals?

Jocelyn Fermin1J

If a problem states energy was emitted would the final answer be negative and if the problem asks energy was absorbed would the final answer be positive?

Jocelyn Fermin1J

Can someone explain how to find the formal charge for elements in Lewis dot structures? If you can include an example that would be very helpful
Thank you in advance!

Jocelyn Fermin1J

Hi, This question revolves around the periodic subshells s, p,d, and f blocks. a) 2d, does not exist because there are only 3d,4d, and the 5d block b) 4d, does exist on the periodic table c) 4g, does not exist on this periodic table; the table only goes up to the f block d) 6f, does not exist becaus...

Jocelyn Fermin1J

Q. No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 times 10^16 Hz. How much energy is required to remove the electron from the metal surface I did get the correct answer for this part which was 1.66x10^-17 J Q. In the first question what is t...

Jocelyn Fermin1J

How do we know how many subshells there are when we are given an n value? For example, "How many subshells are there in the shell with n=4?" Hi, I use this method: subshells are the L (orbital angular momentum), to figure out the L: look at them as levels. Start at 0 and continue writing ...

Jocelyn Fermin1J

Hi Kaleb, The term "penetration" means the electrons are able to get close to the nucleus of an atom, so electrons in the S-orbital do a better job of shielding the positive charge (the negatively charged electrons in the orbitals are attracted to the protons in the nucleus ) because they ...

Jocelyn Fermin1J

I assumed the elements in the same group as Cu and Cr will behave similarly in order to be stable, but only those under Cu have the special rule and Mo under Cr. Can someone explain this? Also emphasizing Valeria's question, "Also, is it possible this same thing can happen but instead of the d ...

Jocelyn Fermin1J

I think if the question specifically asks, but its pretty staight forward; it's just asking if the electron spin is up or down.

Jocelyn Fermin1J

This website helped me understand the different constants : https://www.quora.com/What-is-the-impor ... d-its-uses

Jocelyn Fermin1J

I'm sure the professor will go over it, but from what I can remember it has to do with atom stability.

Jocelyn Fermin1J

I have stumbled on the frequency part; How would you convert MHz to Hz?

Jocelyn Fermin1J

Hello, I found 1 eV = 1.602176565e-19 J, so i believe you would multiply the amount of eVs they give to 1.602176565e-19 J

Jocelyn Fermin1J

Can we have more time for the quizzes or have fewer problems?

Jocelyn Fermin1J

Thank you Natalie!

Jocelyn Fermin1J

Hello, I am stuck on part b of practice problem L.7, please help: The camel stores the fat tristearin, C57H110O6, 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 2C^57 H^110 O^6 (s) 163O^2 (g)->114 CO^2(g) +110 H^2O (l) takes...

Jocelyn Fermin1J

I think you have to triple the .004 because of the 3 in front of AgNO3.

Jocelyn Fermin1J

Hello, with help this is what we came up with:
Find the molarity of Na2CO3=0.08 M
convert mmol of Na+ to moles and convert mmol of CO3^2- and convert mmol of Na2CO3 to moles
mol of Na+/2(0.08M)
mol of CO3^2-/(0.8M)
mol of Na2C03/(0.8M)
convert answers to ML

Jocelyn Fermin1J

HI, that is how you calculate it to grams, but part a asks to calculate to moles. Part b says to calculate to grams.

Jocelyn Fermin1J

Hi, you are on the right track you just rounded the molar mass of Oxygen (15.999 to 16.00) IF you calculate 55.6g/15.999gmol=3.475 mols.

Jocelyn Fermin1J

Hi, for this question you multiply 0.20 moles and 81g/mol to get 16.2grams. You don't multiply by 100 because it's asking for theoretical yield, not percent yield. Hope this is one of the answers.

Jocelyn Fermin1J

Hi, I believe you have to balance the equation to continue your calculations.I also use the same logic to find the limiting reagent.

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