Search found 45 matches
- Tue Nov 26, 2019 12:51 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charges
- Replies: 4
- Views: 289
Re: Charges
You can identify the ionic charge by looking at the periodic table. It depends on how many valence electrons it has and whether it would lose electrons or gain them.
- Tue Nov 26, 2019 12:39 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation state
- Replies: 3
- Views: 256
Oxidation state
what is an oxidation state? how do we know what it is in a certain compound?
- Tue Nov 26, 2019 12:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Sphere
- Replies: 5
- Views: 358
Re: Coordination Sphere
There is a central ion/atom and the ligands attached to it.
- Tue Nov 26, 2019 12:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Cis vs Trans
- Replies: 22
- Views: 1795
Re: Cis vs Trans
cis have the same bonds on one side and trans have the same bonds on opposite sides. Cis would be polar since the bonds don't cancel out and trans would be non-polar.
- Tue Nov 26, 2019 12:19 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 3
- Views: 244
Re: Ligands
I think we should draw out the lewis structure to figure out what it is.
- Tue Nov 26, 2019 12:16 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: brackets
- Replies: 13
- Views: 715
Re: brackets
Anything inside the brackets are a part of the coordination sphere.
- Tue Nov 26, 2019 12:14 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 3
- Views: 249
Coordination Number
How do we know what the coordination number is and why is it important?
- Tue Nov 26, 2019 12:12 pm
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 8
- Views: 539
Re: Cisplatin
cisplatin is more efficient to bonding to cells because of its structure
- Sun Nov 24, 2019 8:37 pm
- Forum: Naming
- Topic: Meaning of Cis and Trans
- Replies: 11
- Views: 943
Re: Meaning of Cis and Trans
cis means the atoms are on the same side while trans means they're on opposite sides from each other. The determines if they are polar or non polar
- Thu Nov 14, 2019 7:49 pm
- Forum: Hybridization
- Topic: Pi and Sigma Bonds
- Replies: 17
- Views: 1299
Re: Pi and Sigma Bonds
single bond = 1 sigma
double bond = 1 sigma, 1 pi
triple bond = 1 sigma, 2 pi
double bond = 1 sigma, 1 pi
triple bond = 1 sigma, 2 pi
- Thu Nov 14, 2019 7:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma vs. Pi Bonds
- Replies: 2
- Views: 251
Re: Sigma vs. Pi Bonds
A sigma bond is a direct overlap between two orbitals.
- Thu Nov 14, 2019 7:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR usage
- Replies: 5
- Views: 342
Re: VSEPR usage
The shape of the molecule does affect it through surface area. The larger the surface area, the more opportunity for Van der Waals interactions which affects other things such as boiling/melting points.
- Thu Nov 14, 2019 7:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Bipyramidal angles
- Replies: 2
- Views: 214
Re: Trigonal Bipyramidal angles
On one plane (the trigonal one), the angles are 120 degrees from each other. The angle of the atom on that plane and the one sticking out above is 90 degrees. The angle of the one above and the one below is 180 degrees.
- Thu Nov 14, 2019 7:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bond angles
- Replies: 10
- Views: 515
Re: bond angles
It depends on the shape of the molecule which can a useful method to remember angles. For example, if it's linear, they're 180 degrees from another. Trigonal planar models are usually 120 degrees from each other and tetrahedral are 109.5 degrees from each other.
- Thu Nov 14, 2019 7:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electrons
- Replies: 9
- Views: 488
Re: Electrons
Having the electrons the farthest apart means they are stable because they are equally repelling from the other elements, thus allowing little movement/instability.
- Thu Nov 14, 2019 7:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles Exceptions
- Replies: 6
- Views: 387
Re: Bond Angles Exceptions
The angles would be the same distance apart if they're the same element. But if there is at least one bonded to a different element, it will be different.
- Thu Nov 14, 2019 7:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: difference between trigonal planar and tetrahedral
- Replies: 4
- Views: 784
Re: difference between trigonal planar and tetrahedral
Trigonal planar molecules have three bonded densities whereas tetrahedral shaped have four. For trigonal, the bonds are 120 degrees apart and for tetrahedral, they're 109.5 degrees apart.
- Thu Nov 14, 2019 7:03 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Atom size vs. boiling point
- Replies: 4
- Views: 608
Atom size vs. boiling point
How does the atomic radius of an atom correlate to its boiling point/melting point?
- Thu Nov 14, 2019 6:59 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling Point
- Replies: 6
- Views: 414
Re: Boiling Point
Ion-ion bonds have the highest boiling points whereas london force have the lowest boiling points.
- Thu Nov 14, 2019 6:56 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Intermolecular forces
- Replies: 10
- Views: 725
Re: Intermolecular forces
Van der Waals bonds are the weakest of the IMF as it depends on the position of the electron. It's weak because the electron are constantly moving, creating temporary dipoles.
- Sun Nov 03, 2019 4:38 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: When would 3d orbital be filled before the 4s orbital?
- Replies: 8
- Views: 534
Re: When would 3d orbital be filled before the 4s orbital?
You usually always fill 4s before 3d (with exceptions of Cr and Cu) but I guess after both orbitals are filled, it wouldn't matter when writing it out?
- Sun Nov 03, 2019 4:32 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Order of removing electrons
- Replies: 4
- Views: 275
Re: Order of removing electrons
4s is originally lower energy than 3d, but once 3d is filled, it becomes higher energy than 3d. Therefore the electron will be removed from 4s before 3d because electrons are removed from the higher energy orbital.
- Sun Nov 03, 2019 4:23 pm
- Forum: Photoelectric Effect
- Topic: Work Function?
- Replies: 7
- Views: 553
Re: Work Function?
The work function/threshold energy is relevant in photoelectric effect problems. The energy of the photon minus the threshold energy equals the kinetic energy.
- Sun Nov 03, 2019 4:16 pm
- Forum: DeBroglie Equation
- Topic: unit of wavelength
- Replies: 5
- Views: 551
unit of wavelength
What is the unit for wavelength in the de broglie equation? Is it meters or nanometers or other?
- Sun Nov 03, 2019 4:13 pm
- Forum: Properties of Light
- Topic: De Broglie
- Replies: 3
- Views: 170
Re: De Broglie
If the electron and proton have the same wavelength, the electron will have the faster velocity because of the lighter mass. You can prove this by plugging the constants into the equation and comparing the speed.
- Sun Oct 27, 2019 3:14 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structure
- Replies: 6
- Views: 237
Re: Drawing Lewis Structure
Drawing it all out can help you keep track of the electrons. It's important to draw them when there are lone pairs too.
- Sun Oct 27, 2019 3:12 pm
- Forum: Lewis Structures
- Topic: Anion
- Replies: 7
- Views: 420
Re: Anion
You calculate the number of electrons (plus/subtract positive/negative charge) and then draw the lewis structure. You also put brackets around the entire model and indicate the charge on the top right outside the brackets.
- Sun Oct 27, 2019 3:09 pm
- Forum: Octet Exceptions
- Topic: electron affinity
- Replies: 6
- Views: 689
Re: electron affinity
Fluorine's atomic size is smaller than Chlorine.
- Sun Oct 27, 2019 1:23 am
- Forum: Ionic & Covalent Bonds
- Topic: Does the Octet Rule apply to Boron?
- Replies: 14
- Views: 905
Re: Does the Octet Rule apply to Boron?
No, it does not apply to Boron. It only has six electrons.
- Sun Oct 27, 2019 1:09 am
- Forum: Ionic & Covalent Bonds
- Topic: Cation
- Replies: 23
- Views: 1916
Re: Cation
Cation are atoms with positive charge whereas anion are negatively charged atoms. This is important when we are drawing them and determining which structure is more stable.
- Sun Oct 20, 2019 8:45 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Period Trends
- Replies: 2
- Views: 108
- Sun Oct 20, 2019 8:40 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty Value
- Replies: 8
- Views: 245
Re: Uncertainty Value
The answer would be .2 because that's the value that is uncertain. It is the difference of the possible positions.
- Sun Oct 20, 2019 8:34 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie Equation
- Replies: 11
- Views: 386
Re: DeBroglie Equation
You can use the the De Broglie equation when you want to calculate the wavelength of a particle when it is traveling at a certain velocity.
- Sun Oct 20, 2019 8:28 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9537
Re: Rydberg equation [ENDORSED]
You can use the Rydberg's formula to when you want to calculate the wavelength of radiation when it transitions from different shell levels.
- Sun Oct 20, 2019 8:25 pm
- Forum: *Shrodinger Equation
- Topic: Negative sign in Equation
- Replies: 4
- Views: 302
Re: Negative sign in Equation
Rydberg's constant is not a negative number.
Megan_1F wrote:Is Rydberg's constant negative? Or is the equation itself just negative?
- Sun Oct 13, 2019 9:51 pm
- Forum: Photoelectric Effect
- Topic: Intensity vs. Length of Waves
- Replies: 4
- Views: 253
Intensity vs. Length of Waves
What is the difference between higher intensity light and a shorter wavelength?
- Sun Oct 13, 2019 9:47 pm
- Forum: Properties of Electrons
- Topic: wave-like vs particle-like
- Replies: 2
- Views: 80
Re: wave-like vs particle-like
Electrons have wave-like properties because like a wave, when electron passes through a crystal, there are diffractions.
- Sun Oct 13, 2019 9:42 pm
- Forum: Photoelectric Effect
- Topic: Threshold Energy
- Replies: 4
- Views: 261
Re: Threshold Energy
Yes, threshold energy is totally different depending on which element it is.
- Sun Oct 13, 2019 9:38 pm
- Forum: Properties of Light
- Topic: Frequency vs. Intensity
- Replies: 4
- Views: 147
Re: Frequency vs. Intensity
In regards to light, intensity is the amount of energy per m/s. Frequency is the amount of cycles a wave length occurs within an amount of time.
- Mon Oct 07, 2019 5:22 pm
- Forum: Empirical & Molecular Formulas
- Topic: Fundamental F.19
- Replies: 3
- Views: 246
Fundamental F.19
After getting the empirical formula as C4H5N2O, we have to find the molecular formula but they never gave us the molar mass spectrometry. How would we calculate that ourselves?
- Sat Oct 05, 2019 5:36 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Theoretical Yield
- Replies: 9
- Views: 413
Re: Calculating Theoretical Yield
The theoretical yield is the best possible outcome which means it would have to use the entire limiting reagent.
- Sat Oct 05, 2019 5:35 pm
- Forum: Limiting Reactant Calculations
- Topic: Explaining why a reactant is limiting
- Replies: 4
- Views: 212
Re: Explaining why a reactant is limiting
I’m pretty sure we have to fully show out how you got those calculations through math/work but after that, a word explanation like that should be fine.
- Sat Oct 05, 2019 5:33 pm
- Forum: Limiting Reactant Calculations
- Topic: Textbook M15-Calculation?
- Replies: 3
- Views: 192
Re: Textbook M15-Calculation?
At the end, you should’ve multiplied the 5.03 mol AlCl3 with the molar mass which is about 133.331. You have to divide the 300 g by the answer you got to get the percent yield.
- Sat Oct 05, 2019 5:21 pm
- Forum: Balancing Chemical Reactions
- Topic: Understanding how to get whole #s [ENDORSED]
- Replies: 18
- Views: 1340
Re: Understanding how to get whole #s [ENDORSED]
For this, you would need to multiply it by 2 to get a whole number. Rounding 2.5 either up and down is too much for the formula to have the same composition.
- Sat Oct 05, 2019 5:09 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig figs
- Replies: 5
- Views: 220
Sig figs
How come some numbers have a .0 at the end in questions? For example, it is 30.0 g instead of just 30 g.