Search found 24 matches
- Sun May 27, 2018 11:46 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Difference in bonds
- Replies: 3
- Views: 593
Re: Difference in bonds
Bond strength increases with the number of bonds, so triple bond > double bond > single bond. Bond length works in the opposite manner, with the weakest bonds being the longest bonds, so triple bond < double bond < single bond.
- Sun May 27, 2018 11:42 am
- Forum: Hybridization
- Topic: Hybrid Orbitals
- Replies: 4
- Views: 563
Re: Hybrid Orbitals
Regular orbitals fill up in the typical way, with each orbital half filling (taking on only one electron) before any of them fill completely (2 electrons total) and then filling the next orbital in the same manner (Hund's Rule). Hybrid orbitals combine so that all the valence electrons are available...
- Sun May 27, 2018 11:29 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Types of Bonds
- Replies: 6
- Views: 853
Re: Types of Bonds
Sigma bonds allow atoms to rotate independently of each other, but pi bonds don't.
- Sun May 20, 2018 9:25 pm
- Forum: Dipole Moments
- Topic: Meaning of a dipole
- Replies: 7
- Views: 814
Re: Meaning of a dipole
A dipole describes the separation of charges in a molecule of covalently bonded atoms. I'm pretty sure a dipole moment is just the measurement of the separation of those opposite charges.
Hope this helps!
Hope this helps!
- Sun May 20, 2018 9:14 pm
- Forum: Octet Exceptions
- Topic: Self-Test 3.10A
- Replies: 1
- Views: 338
Re: Self-Test 3.10A
An expanded octet for Xe would allow it to take on 10 extra electrons (in its d-orbital) on top of the 8 it needs for its octet. When you give it 12 electrons your really only putting 4 electrons in its d-orbital.
- Sun May 13, 2018 10:33 pm
- Forum: Octet Exceptions
- Topic: Expanded Octet
- Replies: 2
- Views: 466
Expanded Octet
How many extra electrons can atom with an expanded octet take on? Can it take on 10 extra because that's how many can fit in the d orbital?
- Sun May 13, 2018 10:26 pm
- Forum: Electronegativity
- Topic: Electronegativity vs. Electron affinity
- Replies: 7
- Views: 841
Re: Electronegativity vs. Electron affinity
To answer your second question, I believe the less electronegative an element is, the more likely it is to be the central atom.
- Sat May 12, 2018 3:48 pm
- Forum: Lewis Structures
- Topic: Charge and Structures
- Replies: 2
- Views: 319
Re: Charge and Structures
Yes, the formal charges on each of the atoms in the molecule should add up to the overall charge of the molecule. I don't know of any exceptions, but there might be some?
- Sun May 06, 2018 9:31 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d before 4s
- Replies: 9
- Views: 1125
Re: 3d before 4s
Yes, that's correct because the 3d orbital is higher in energy than the 4s orbital.
- Sun May 06, 2018 8:38 pm
- Forum: Trends in The Periodic Table
- Topic: 2.67
- Replies: 3
- Views: 329
Re: 2.67
Ionization energy is the smallest amount of energy it takes to remove an electron from an atom in the gas phase. The trend for ionization energy (I think that's what you're asking for) is that it increases as you move across a period because there are more protons in the nuclei, increasing the nucle...
- Sun May 06, 2018 6:34 pm
- Forum: Trends in The Periodic Table
- Topic: electronegativity
- Replies: 4
- Views: 585
Re: electronegativity
Electronegativity describes the ability of an atom to attract electrons. The more protons an atom has (as indicated by the atomic number), the better it is at attracting electrons. That's why Oxygen has a higher electronegativity than Nitrogen. As a general rule of thumb, electronegativity increases...
- Sun Apr 29, 2018 9:50 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Using shorthand [Ar] [ENDORSED]
- Replies: 5
- Views: 599
Re: Using shorthand [Ar] [ENDORSED]
I believe we can use any of the noble gases in our shorthand. Hope that helps!
- Sun Apr 29, 2018 5:02 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Fourth Quantum Number
- Replies: 5
- Views: 699
Re: Fourth Quantum Number
I'm not sure if we actually need to calculate whether the electron is spinning up or down but if you're given the ms value of +1/2 you should know that it means the electron is spinning up and if you're given the ms value -1/2 you should know that the electron is spinning down.
- Sun Apr 29, 2018 4:22 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 4s orbital lower in energy than 3d
- Replies: 3
- Views: 1474
4s orbital lower in energy than 3d
I know we went over this in class on Friday, but I'm still unsure why the 3d state is higher in energy than the 4s state for Potassium and Calcium. Can someone explain why?
- Wed Apr 25, 2018 10:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3889432
Re: Post All Chemistry Jokes Here
What do chemists use to make guacamole? Avogadros
- Sun Apr 22, 2018 9:46 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Balmer Series vs Lyman Series
- Replies: 4
- Views: 1145
Re: Balmer Series vs Lyman Series
The Paschen series ends at energy level n=3 and the Brackett series ends at energy level n=4. I don't know much more about them but I hope that helps!
- Sun Apr 22, 2018 9:32 pm
- Forum: Properties of Electrons
- Topic: Circular Standing Waves
- Replies: 2
- Views: 409
Circular Standing Waves
I'm a little confused as to what Dr. Lavelle meant by electrons being in circular standing waves, is that just describing the discrete energy levels of electrons?
- Sat Apr 21, 2018 12:04 pm
- Forum: DeBroglie Equation
- Topic: Wavelength and De Broglie Equation [ENDORSED]
- Replies: 9
- Views: 1052
Re: Wavelength and De Broglie Equation [ENDORSED]
It's important to remember though that De Broglie can only be used with particles because they have mass, so it's not applicable to light.
- Sun Apr 15, 2018 6:15 pm
- Forum: Properties of Light
- Topic: How do I use Planck's constant? [ENDORSED]
- Replies: 4
- Views: 623
Re: How do I use Planck's constant? [ENDORSED]
In the equation for the energy per photon, E=hv, h is Planck's constant and it's multiplied by frequency (v). I hope that helps!
- Sun Apr 15, 2018 4:35 pm
- Forum: Properties of Light
- Topic: HW chapter 1 question 3
- Replies: 2
- Views: 384
Re: HW chapter 1 question 3
The speed of light is constant as shown by the equation 'c=(lambda)(v)'. If the frequency decreases, wavelength must increase keeping the speed the same constant value.
- Sun Apr 15, 2018 4:05 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Expirement [ENDORSED]
- Replies: 4
- Views: 489
Re: Photoelectric Effect Expirement [ENDORSED]
To add to the previous comment, the experiment showed that high frequency light can eject electrons even if the light has low intensity. When the intensity of low frequency light was increased, the light still couldn't eject electrons from the metal surface because the frequency was the problem, not...
- Sat Apr 14, 2018 9:48 pm
- Forum: Properties of Light
- Topic: formula for light problems
- Replies: 2
- Views: 399
Re: formula for light problems
I'm not sure that we'll always have to rearrange these equations, but for this problem we did because we were not given frequency (v). In order to find frequency we had to solve E=hv for v (v=E/h). The problem was asking for wavelength so we solved c=('lambda')(v) for lambda (lambda=c/v) and substit...
- Sat Apr 14, 2018 9:36 pm
- Forum: Properties of Light
- Topic: Units for wavelengths [ENDORSED]
- Replies: 6
- Views: 663
Re: Units for wavelengths [ENDORSED]
Yes, wavelength is represented by lambda and frequency is represented by v
- Wed Apr 11, 2018 5:44 pm
- Forum: Balancing Chemical Reactions
- Topic: Fastest way to balance chemical equation
- Replies: 9
- Views: 16949
Re: Fastest way to balance chemical equation
Another tip is to balance any freestanding elements last because they're the easiest to manipulate.