Search found 62 matches
- Sun Jun 10, 2018 10:58 pm
- Forum: Polyprotic Acids & Bases
- Topic: ligand bonds
- Replies: 2
- Views: 634
ligand bonds
In discussion when written as an example when written as a ligand bond, our TA told us that water was written as OH2 because O is the atom that reacts with the metal but what does writing it this way have to do with the bond structure?
- Sun Jun 10, 2018 10:54 pm
- Forum: Polyprotic Acids & Bases
- Topic: Coordination number [ENDORSED]
- Replies: 3
- Views: 1153
Coordination number [ENDORSED]
In section our TA talked about coordination number, what does this have to do with oxidation number or the central metal
- Fri Jun 08, 2018 4:37 pm
- Forum: Sigma & Pi Bonds
- Topic: exceptions
- Replies: 2
- Views: 436
exceptions
In the book, it says there a few exceptions where a double bond is sometimes two pi bonds instead of one sigma and one pi. Are we expected to know these instances and are there any other exceptions that we need to know?
- Thu Jun 07, 2018 6:54 pm
- Forum: Lewis Acids & Bases
- Topic: HW J9
- Replies: 2
- Views: 473
Re: HW J9
Since it has no bonds it would be easier to donate H+ protons making it a strong acid.
- Thu Jun 07, 2018 6:50 pm
- Forum: Lewis Structures
- Topic: Valence Electrons for d-Block Elements?
- Replies: 2
- Views: 494
Re: Valence Electrons for d-Block Elements?
for transition metals on the periodic table, they cant be assigned traditional valence electrons like the rest of the table according to the group, but in the d block it ranges from group 3 to 12 and all but group 3 that has 3 valence e-, can have a different number of valence e- depending on the si...
- Thu Jun 07, 2018 6:40 pm
- Forum: Hybridization
- Topic: Composition of a bond (Sigma and Pi Bonds)
- Replies: 3
- Views: 509
Re: Composition of a bond (Sigma and Pi Bonds)
I believe this is the period that this atom belongs to on the periodic table.
- Sun Jun 03, 2018 10:51 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: AXE formula
- Replies: 32
- Views: 11967
AXE formula
is it possible to determine the shape of a molecule if you're only given the AXE formula, if so how do you do it?
- Sun Jun 03, 2018 10:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Radical
- Replies: 4
- Views: 429
Re: Radical
E represents lone electron pairs. so to my understanding, it has to be a pair, if not then it is not counted for.
- Sun Jun 03, 2018 10:40 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Atom Distance, repulsion?
- Replies: 6
- Views: 860
Re: Atom Distance, repulsion?
the negative charge of electrons repel other negatively charged electrons making them try to be as far apart from each other as possible
- Sun Jun 03, 2018 10:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR and Lewis
- Replies: 2
- Views: 290
Re: VSEPR and Lewis
In the correct Lewis structure for boron trifluoride, the bond angles are 120 degrees. because the have to be equally spaced because of the electron repulsion.
- Thu May 31, 2018 11:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: regions of e- density
- Replies: 4
- Views: 473
regions of e- density
do the number of regions of electron density always directly correspond to molecular shapes or are there exceptions?
- Tue May 29, 2018 11:57 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: single electron and shape
- Replies: 3
- Views: 321
single electron and shape
How does a single electron effect molecular shape? Does it effect shape the same as how a lone pair does?
- Sun May 27, 2018 9:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Difference between polar covalent and ionic bond?
- Replies: 2
- Views: 4653
Re: Difference between polar covalent and ionic bond?
Also a covalent bond the electrons are shred between the atoms and in an ionic bond the more electronegative atom takes the electron to fulfill its octet and the other gives up it's electron and they bond because of the negative and positive charges cause them to attract.
- Sun May 27, 2018 9:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: Partial charge or full charge
- Replies: 4
- Views: 5568
Re: Partial charge or full charge
Also by finding the formal charge you can see charges and how the affect each other as well as how they cancel out in stable molecules
- Sun May 27, 2018 2:29 pm
- Forum: Lewis Structures
- Topic: Single electron
- Replies: 5
- Views: 481
Re: Single electron
Yes, like if it is how is it made stable?
- Sun May 27, 2018 2:25 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 380
Hybridization
I understand how to find hybridization for problems but I don't exactly understand what it has to do with. Can someone explain?
- Sun May 27, 2018 2:21 pm
- Forum: Hybridization
- Topic: basics of hybridization
- Replies: 18
- Views: 2360
Re: basics of hybridization
If you want more practice with hybridization I think this explains it pretty well.
https://youtu.be/4xl0BD-tMeA
https://youtu.be/4xl0BD-tMeA
- Sun May 27, 2018 1:19 pm
- Forum: Lewis Structures
- Topic: Single electron
- Replies: 5
- Views: 481
Single electron
When there is a single electron left why isn't it just a cation to add another electron?Wouldn't it be more stable this way?
- Sun May 27, 2018 12:48 pm
- Forum: Lewis Structures
- Topic: 2 lone pairs
- Replies: 5
- Views: 579
2 lone pairs
On a structure that has 2 lone pairs on the center atom, how are we supposed to know when the strcutes go on the top and bottom or both stay on the top side?
- Sun May 20, 2018 11:55 pm
- Forum: Dipole Moments
- Topic: lone pairs
- Replies: 3
- Views: 448
lone pairs
do lone pairs contribute and have dipole moments?
- Sun May 20, 2018 11:47 pm
- Forum: Octet Exceptions
- Topic: Octet Exception
- Replies: 7
- Views: 1067
Re: Octet Exception
I think we just have to memorize the certain ones but what makes them exceptions are if certain molecules have an odd number of electrons, if one of the atoms in the molecules has more than eight electrons, or if one atom has less than eight electrons
- Sun May 20, 2018 11:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionic and covalent character
- Replies: 7
- Views: 3045
ionic and covalent character
when seeing if a bond is ionic or covalent with the few exceptions is there a way to figure this out or do we just have to know the exceptions
- Sun May 20, 2018 11:28 pm
- Forum: Lewis Structures
- Topic: central atom
- Replies: 7
- Views: 535
central atom
how exactly do you know which atom is the central atom when drawing Lewis structures?
- Sun May 20, 2018 11:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Properties of Hydrogen
- Replies: 3
- Views: 413
Re: Properties of Hydrogen
Hydrogen is actually a gas and forms binds with non metals
- Sun May 20, 2018 11:16 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Character?
- Replies: 3
- Views: 764
Re: Covalent Character?
Covalent character is shown by electronegativity or how much an atom attracts electron pairs to it.
- Sun May 13, 2018 11:26 pm
- Forum: Lewis Structures
- Topic: Valence Electrons [ENDORSED]
- Replies: 2
- Views: 305
Re: Valence Electrons [ENDORSED]
Valence electrons are the outmost electrons in an atom. these electrons are the electrons that are involved in reactions that form compounds and things like cations and anions.
- Sun May 13, 2018 11:24 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions [ENDORSED]
- Replies: 3
- Views: 485
Exceptions [ENDORSED]
So I know that there are exceptions for chromium and copper when doing electron configurations, but does anyone know exactly why this happens? My first thought is that it takes away an electron from another orbital, is this close to being correct?
- Sun May 13, 2018 11:20 pm
- Forum: Lewis Structures
- Topic: Benzine
- Replies: 3
- Views: 470
Re: Benzine
unless we're asked to draw out every possible structure of electrons in a compound then yes, but if not then I don't think so.
- Sun May 13, 2018 11:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: octet explanation [ENDORSED]
- Replies: 3
- Views: 396
octet explanation [ENDORSED]
In the definition of the octet rule in the textbook what exactly is meant when it says atoms go "as far as possible" toward completing their octets?
- Sun May 13, 2018 11:03 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Bonds
- Replies: 4
- Views: 502
Re: Ionic Bonds
To answer the last part of your question, ionic bonds are formed by nonmetals and metal atoms while covalent is between two nonmetals.
- Tue May 08, 2018 4:54 pm
- Forum: Trends in The Periodic Table
- Topic: 2.67 part b
- Replies: 2
- Views: 304
Re: 2.67 part b
i meant to the right of the m=table in the question up above
- Tue May 08, 2018 4:45 pm
- Forum: Trends in The Periodic Table
- Topic: 2.67 part b
- Replies: 2
- Views: 304
2.67 part b
Why does Carbon have a higher electron affinity than Nitrogen when the periodic trend shows that electron affinity increases as you go up and to the left of the table?
- Sun May 06, 2018 11:30 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration-(Sn)
- Replies: 5
- Views: 681
Re: Electron Configuration-(Sn)
When writing this out just remember that it is written from the lower energy levels to highest so "p,s,d,f" and must be filled in that order.
- Sun May 06, 2018 11:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: van der waals forces [ENDORSED]
- Replies: 3
- Views: 415
Re: van der waals forces [ENDORSED]
I know we learned about this is the 7 series but I don't think we need to know this since it's not too relevant to chemical bonds right now.
- Sun May 06, 2018 11:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.27 [ENDORSED]
- Replies: 1
- Views: 128
2.27 [ENDORSED]
In problem 2.27 you're asked to find the subshell notation and are given "n" and "l" and I get how to you use the "n" and the "l" but how come the "l" given doesn't correspond with the "n" given, like wouldn't you usually use the "n&qu...
- Sun May 06, 2018 11:05 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: How many significant figures? [ENDORSED]
- Replies: 5
- Views: 488
Re: How many significant figures? [ENDORSED]
Just remember to use the rules of sig figs when either multiplying/dividing or adding/subtracting. With multi./division you keep the same number of digits as the smallest number of sig figs in your problem and for addition/subtraction, you keep the sig fig until the digit of the least accuracy.
- Wed May 02, 2018 5:58 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.25 [ENDORSED]
- Replies: 3
- Views: 466
2.25 [ENDORSED]
In 2.25 I get the correlation of maximum electrons and orbitals for the most part, except for in part c wherein the 1s block the answer is 2 e, when i thought hydrogen could only have 1 electron. how can this be?
- Wed May 02, 2018 2:05 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: d block electron configuration
- Replies: 5
- Views: 1299
d block electron configuration
In electron configuration why do we start from 3 in period 4 when working in the d block?
- Sun Apr 29, 2018 11:45 pm
- Forum: Properties of Electrons
- Topic: ejecting electrons
- Replies: 4
- Views: 485
ejecting electrons
when ejecting electrons does amplitude of wavelength have anything to do with it?
- Sun Apr 29, 2018 11:33 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: test 2 #4
- Replies: 4
- Views: 561
test 2 #4
On test 2 on question we had to find the energy difference but were not given then levels like n=? so how would we go about doing this?
- Sun Apr 29, 2018 11:31 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: E=R(1/n-1/n)?
- Replies: 7
- Views: 1029
E=R(1/n-1/n)?
I'm confused on how exactly Borh's equation is turned into E=R(1/n-1/n) when finding the difference in energy level?
- Sun Apr 29, 2018 11:28 pm
- Forum: Photoelectric Effect
- Topic: Calculating kinetic energy of an emitted electron [ENDORSED]
- Replies: 3
- Views: 709
Re: Calculating kinetic energy of an emitted electron [ENDORSED]
The mass of an electron is a constant that you use in the equation for kinetic energy the only other way that you have to worry about mass is when it's asking for the energy of a molecule or atom where you would them have to use the periodic table to find its mass.
- Sun Apr 29, 2018 11:25 pm
- Forum: Einstein Equation
- Topic: Difference Between Equations
- Replies: 4
- Views: 527
Re: Difference Between Equations
In the E=hv equation, you use Planck's constant and frequency to find the energy of a photon, while with the E=1/2mv^2, you use mass and velocity to find the kinetic energy.
- Sun Apr 29, 2018 11:22 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodes
- Replies: 2
- Views: 364
Re: Nodes
Radial nodes are nodes inside the orbital lobes and by looking at s -orbitals, you can see that they only have radial nodes and an angular node is fixed at certain angles.
- Sun Apr 22, 2018 11:39 pm
- Forum: Einstein Equation
- Topic: finding frequency from Einstein's equation [ENDORSED]
- Replies: 3
- Views: 583
finding frequency from Einstein's equation [ENDORSED]
How exactly in a problem would you find frequency when given momentum?
- Sun Apr 22, 2018 11:36 pm
- Forum: Einstein Equation
- Topic: de brogile equation
- Replies: 6
- Views: 1161
de brogile equation
in the de Broglie equation why does it state that any moving "particle" , when the examples talk about cars. can any moving object talk have a wavelength?
- Sun Apr 22, 2018 11:32 pm
- Forum: Properties of Electrons
- Topic: properties of electrons
- Replies: 1
- Views: 411
properties of electrons
What exactly is meant by a circular standing wave around a nucleus and how is this relevant to the spectra?
- Sun Apr 22, 2018 11:03 pm
- Forum: Significant Figures
- Topic: Use of sigfigs
- Replies: 8
- Views: 877
Re: Use of sigfigs
Sig figs are used to make sure your answers are accurate and remember that it depends if you are multiplying/dividing or adding/ subtracting that you either use the least amount of sig figs when you add and subtract or use the least amount decimal places when mult. / dividing.
- Sun Apr 22, 2018 12:10 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Discrepancy in Rydberg equation [ENDORSED]
- Replies: 1
- Views: 151
Re: Discrepancy in Rydberg equation [ENDORSED]
It has no negative in front because it just doesn't make sense for a wavelength to be negative.
- Sun Apr 22, 2018 12:07 am
- Forum: Einstein Equation
- Topic: Planck's Constant Value [ENDORSED]
- Replies: 7
- Views: 3318
Re: Planck's Constant Value [ENDORSED]
It depends on significant figures rules and if you're multiplying/dividing or adding/subtracting
- Sun Apr 15, 2018 11:55 pm
- Forum: Properties of Light
- Topic: plancks constant
- Replies: 2
- Views: 150
plancks constant
how exactly is Planck's constant of 6.63x10j*s^-34 relevant to the equation and what does it stand for?
- Sun Apr 15, 2018 11:50 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: concentration
- Replies: 2
- Views: 299
concentration
how do we find the mass of a solute when given the concentration using the equation given to us in class.
- Sun Apr 15, 2018 11:42 pm
- Forum: Significant Figures
- Topic: diference in sig figs
- Replies: 5
- Views: 535
diference in sig figs
What is the difference when multiplying, dividing, adding, subtracting when accounting for significant figures?
- Sun Apr 15, 2018 11:36 pm
- Forum: Empirical & Molecular Formulas
- Topic: empirical vs molecular
- Replies: 5
- Views: 674
empirical vs molecular
why when solved are the outcomes so different like in the example Dr. Lavelle gave us with glucose, CH2O(empirical) and C6H12O6(molecular)?
- Sun Apr 15, 2018 11:14 pm
- Forum: Properties of Light
- Topic: Experiments in Chemistry
- Replies: 2
- Views: 156
Re: Experiments in Chemistry
most of these experiments are there as examples that are relevant to equations or many of the ideas in chemistry.
- Sun Apr 15, 2018 11:12 pm
- Forum: Properties of Light
- Topic: Wave particle duality
- Replies: 3
- Views: 191
Re: Wave particle duality
in wavelength duality, the wavelength itself is not changed by interference only the amplitude is.
- Sun Apr 15, 2018 11:09 pm
- Forum: Properties of Light
- Topic: Frequency 1/s or s^-1 [ENDORSED]
- Replies: 3
- Views: 478
Re: Frequency 1/s or s^-1 [ENDORSED]
So the notation s^-1 is just another way of saying 1/s and are interchangeable.
- Sun Apr 15, 2018 10:50 pm
- Forum: Properties of Light
- Topic: Wavelength [ENDORSED]
- Replies: 9
- Views: 1087
Re: Wavelength [ENDORSED]
Hi Jimmy, no measuring a wavelength does not have to be peak to peak, but it is just an easier way to visualize each wave. a wave can measured from any spot to the same spot after a complete cycle has passed. hope this helps.
- Sun Apr 15, 2018 10:47 pm
- Forum: Properties of Light
- Topic: wave length
- Replies: 5
- Views: 422
wave length
I'm confused on how exactly amplitude plays a role in oscillations and wavelength. can some explain this to me?
- Sun Apr 08, 2018 11:57 pm
- Forum: Empirical & Molecular Formulas
- Topic: f11
- Replies: 3
- Views: 393
f11
For f11 in the homework, when converting the mass percentages into its mass percentage in grams, how exactly can I convert it?
- Sun Apr 08, 2018 11:54 pm
- Forum: Balancing Chemical Reactions
- Topic: Fractions in chemical equations [ENDORSED]
- Replies: 5
- Views: 1877
Re: Fractions in chemical equations [ENDORSED]
you can't have fractions when balancing equations because it wouldn't make sense to have 3/4 of a carbon atom when you cant just split atoms in ordinary chemical equations. Hope this helps.
- Sun Apr 08, 2018 11:49 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Definition of moles [ENDORSED]
- Replies: 5
- Views: 656
Re: Definition of moles [ENDORSED]
A mol is a unit of measurement for an amount of a specific substance such as carbon or hydrogen, and they are different because they are completely different chemical substances and Avogadro's number (6.022 x 10^23 mol^-1) is just a constant when converting grams to atomic mass. I hope this helps.