CHEMISTRY COMMUNITY

Mohamad Farhat 1L

do we have to memorize ligands?

Mohamad Farhat 1L

A ligand is any molecule or ion that can donate a lone pair of electrons to a transition metal ion to form a covalent bond.Ligands must have one or more lone pairs of electrons. Ligands may be neutral or charge

Mohamad Farhat 1L

yes by the central atom

such as ch3

.
h -c-h
|
h

Mohamad Farhat 1L

An atom is said to have a nonzero net charge only when it either loses or gains electrons to become an ion.
Ionic charge >3+, 3-
Charge on an atom inside a compound
Oxidation number >+3, -3

Mohamad Farhat 1L

I believe it is 72°, 90°

Mohamad Farhat 1L

do we need to know molecular orbital theory, bond order etc for the exam?

Mohamad Farhat 1L

I believe so we do.

Mohamad Farhat 1L

the final is evenly distributed throughout the whole course. Each chapter will have problems on the exam

Mohamad Farhat 1L

polarity does affect solubility in water, because like dissolves like. If the substance is polar it will dissolve well, and if it is nonpolar, the substance will not dissolve as well.

Mohamad Farhat 1L

Ligands are ions or neutral molecules that bond to a central metal atom or ion. Ligands act as Lewis bases (electron pair donors), and the central atom acts as a Lewis acid. Ligands have at least one donor atom with an electron pair used to form covalent bonds with the central atom.

Mohamad Farhat 1L

1 single bond = 1 sigma bond

1 double bond = 1 sigma bond + 1 pi bond

1 triple bond = 1 sigma bond + 2 pi bonds

Mohamad Farhat 1L

cacl2 mgcl2

3.16-1.00 3.16-1.31
2.16 en. 1.85 en

cacl2 has greater ionic character

Mohamad Farhat 1L

the small number of elements the stronger the bond. since both have 6 bonds. 1st one has two double and two single and the second has 3 elements with 3 double bonds. which makes it stronger

Mohamad Farhat 1L

to add on the comment above, is when to determining a ionic, polar or non polar covalent bond, you find the difference In electronegativity and if the difference range from 0 to 0.4 then it is a covalent bond and if it ranges from .5 to 1.7 then it is a polar covalent bond, if it is more than 1.7 th...

Mohamad Farhat 1L

I think it matters how many 90 degree lp-bp interactions there are rather than how far apart the lone pairs are.

Mohamad Farhat 1L

why does it only have 6 valence electrons? I didn't understand it clearly.

Mohamad Farhat 1L

since n= 5 then n-1, to get ml, 5-1 is = is 4. l in that problem is 0. based on what you gave me.
but generally n= the number. to get l it is n-1. to get ml it is -l to l values.

Mohamad Farhat 1L

what is the difference between electron affinity and electronegativity?

Mohamad Farhat 1L

thank you!

Mohamad Farhat 1L

how can we determine 1st round of ionization compared to 2nd round of ionization energy?

Mohamad Farhat 1L

is their a way we can see the final answers of quiz 1?

Mohamad Farhat 1L

just choose the central atom, count the electrons and then place the electrons around the atoms.if theres a charge then place a bracket and write the subscript. but it docent matter unless theres a bond to it.

Mohamad Farhat 1L

which element can have valence electrons with the quantum numbers:

a)n= 2, l=1

can someone explains this throughly.

Mohamad Farhat 1L

find the max electrons in an atom
n=2 , l=1, ml=1, ms=+1/2
the answer is that there is 1 electron why is that.
I know that when there is 1 ml then that means there is 2 electrons. does ms make it 1 electron?

Mohamad Farhat 1L

from my understanding, principle quantum number, describes the energy level of the electron that its located in. example, if an electron lies on the first energy level then the electrons principle number is n=1. hope this is helpful.

Mohamad Farhat 1L

from the lecture, the professor was discussing each electron configuration of each element. I was confused on way scandium starts from 3d^1. I know that its in the d block however why does it start with a d 3.

Mohamad Farhat 1L

typically you would use the debroglie equation. You would have wavelength = h over m times v. you would switch v and wavelength and solve for v.

Mohamad Farhat 1L

on the cover page of the first exam, it is listed as 3.29 x 10^15 hz. so I'm assuming we use that one.

Mohamad Farhat 1L

He developed a method of measuring the minute electric charge that is present on many of the droplets in an oil mist. Millikan was able to measure both the amount of electric force and magnitude of electric field on the tiny charge of an isolated oil droplet.

Mohamad Farhat 1L

they say 70% of you is h2o, well the other 30% of me wants2die.

Mohamad Farhat 1L

I had a similar question to this one. I was curious how when wearing a black shirt on a hot day absorbs more heat.

Mohamad Farhat 1L

A photon has the properties of wave like. And a photo Dosent.

Quantum can be described as a measure of quantity, but a photon is not about a measure of quantity.

Mohamad Farhat 1L

It just depends on what they are asking for. Usually it is in L. But if it is in ml then switch to L.

Mohamad Farhat 1L

For me the best way to balance equations is writing each element on the side and counting it. Take one step at a time looking at the one which looks the simplest.
To make sure that the equations balanced I just count each element again to reassure.

Mohamad Farhat 1L

the last comment is right. But it may be more difficult to figure it out on an exam.

Mohamad Farhat 1L

A reagent in a chemical reaction facilitates the chemical reaction and a reactant is a substance that is directly involved in a chemical reaction.

Mohamad Farhat 1L

The modules are very helpful to understand some of the concepts. The questions are more difficult however once you breaking down the questions they are beneficial.

Mohamad Farhat 1L

its always good to have them memorized or at least be familiar with elements therefore when you see it on an exam you are able to know what it is.

Mohamad Farhat 1L

I think sig figs are important when it comes down to math measurements.

Mohamad Farhat 1L

I am taking this Chem 14a this quarter. I took honors Chem which seems very familiar. however I forgot many of the concepts. The best way to refresh your mind is watch videos such as khan academy or on youtube. Working through the math problems is the best way to understand it. If you don't understa...

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