Search found 45 matches

by Quynh Vo
Tue Nov 26, 2019 12:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Charges
Replies: 4
Views: 75

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.
by Quynh Vo
Tue Nov 26, 2019 12:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation state
Replies: 3
Views: 37

Oxidation state

what is an oxidation state? how do we know what it is in a certain compound?
by Quynh Vo
Tue Nov 26, 2019 12:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Sphere
Replies: 5
Views: 45

Re: Coordination Sphere

There is a central ion/atom and the ligands attached to it.
by Quynh Vo
Tue Nov 26, 2019 12:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Cis vs Trans
Replies: 21
Views: 479

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.
by Quynh Vo
Tue Nov 26, 2019 12:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 3
Views: 40

Re: Ligands

I think we should draw out the lewis structure to figure out what it is.
by Quynh Vo
Tue Nov 26, 2019 12:16 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: brackets
Replies: 13
Views: 144

Re: brackets

Anything inside the brackets are a part of the coordination sphere.
by Quynh Vo
Tue Nov 26, 2019 12:14 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 3
Views: 31

Coordination Number

How do we know what the coordination number is and why is it important?
by Quynh Vo
Tue Nov 26, 2019 12:12 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 8
Views: 77

Re: Cisplatin

cisplatin is more efficient to bonding to cells because of its structure
by Quynh Vo
Sun Nov 24, 2019 8:37 pm
Forum: Naming
Topic: Meaning of Cis and Trans
Replies: 11
Views: 147

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
by Quynh Vo
Thu Nov 14, 2019 7:49 pm
Forum: Hybridization
Topic: Pi and Sigma Bonds
Replies: 17
Views: 488

Re: Pi and Sigma Bonds

single bond = 1 sigma
double bond = 1 sigma, 1 pi
triple bond = 1 sigma, 2 pi
by Quynh Vo
Thu Nov 14, 2019 7:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs. Pi Bonds
Replies: 2
Views: 45

Re: Sigma vs. Pi Bonds

A sigma bond is a direct overlap between two orbitals.
by Quynh Vo
Thu Nov 14, 2019 7:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR usage
Replies: 5
Views: 48

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.
by Quynh Vo
Thu Nov 14, 2019 7:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal angles
Replies: 2
Views: 37

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.
by Quynh Vo
Thu Nov 14, 2019 7:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angles
Replies: 10
Views: 107

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.
by Quynh Vo
Thu Nov 14, 2019 7:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electrons
Replies: 9
Views: 104

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.
by Quynh Vo
Thu Nov 14, 2019 7:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles Exceptions
Replies: 6
Views: 54

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.
by Quynh Vo
Thu Nov 14, 2019 7:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: difference between trigonal planar and tetrahedral
Replies: 4
Views: 46

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.
by Quynh Vo
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: 79

Re: Boiling Point

Ion-ion bonds have the highest boiling points whereas london force have the lowest boiling points.
by Quynh Vo
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: 144

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.
by Quynh Vo
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: 76

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?
by Quynh Vo
Sun Nov 03, 2019 4:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Order of removing electrons
Replies: 4
Views: 62

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.
by Quynh Vo
Sun Nov 03, 2019 4:23 pm
Forum: Photoelectric Effect
Topic: Work Function?
Replies: 7
Views: 120

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.
by Quynh Vo
Sun Nov 03, 2019 4:16 pm
Forum: DeBroglie Equation
Topic: unit of wavelength
Replies: 5
Views: 198

unit of wavelength

What is the unit for wavelength in the de broglie equation? Is it meters or nanometers or other?
by Quynh Vo
Sun Nov 03, 2019 4:13 pm
Forum: Properties of Light
Topic: De Broglie
Replies: 3
Views: 68

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.
by Quynh Vo
Sun Oct 27, 2019 3:14 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structure
Replies: 6
Views: 47

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.
by Quynh Vo
Sun Oct 27, 2019 3:12 pm
Forum: Lewis Structures
Topic: Anion
Replies: 7
Views: 97

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.
by Quynh Vo
Sun Oct 27, 2019 3:09 pm
Forum: Octet Exceptions
Topic: electron affinity
Replies: 6
Views: 254

Re: electron affinity

Fluorine's atomic size is smaller than Chlorine.
by Quynh Vo
Sun Oct 27, 2019 1:23 am
Forum: Ionic & Covalent Bonds
Topic: Does the Octet Rule apply to Boron?
Replies: 14
Views: 146

Re: Does the Octet Rule apply to Boron?

No, it does not apply to Boron. It only has six electrons.
by Quynh Vo
Sun Oct 27, 2019 1:09 am
Forum: Ionic & Covalent Bonds
Topic: Cation
Replies: 23
Views: 459

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.
by Quynh Vo
Sun Oct 20, 2019 8:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Period Trends
Replies: 2
Views: 43

Re: Period Trends

yes
by Quynh Vo
Sun Oct 20, 2019 8:40 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Value
Replies: 8
Views: 90

Re: Uncertainty Value

The answer would be .2 because that's the value that is uncertain. It is the difference of the possible positions.
by Quynh Vo
Sun Oct 20, 2019 8:34 pm
Forum: DeBroglie Equation
Topic: DeBroglie Equation
Replies: 11
Views: 147

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.
by Quynh Vo
Sun Oct 20, 2019 8:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 3722

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.
by Quynh Vo
Sun Oct 20, 2019 8:25 pm
Forum: *Shrodinger Equation
Topic: Negative sign in Equation
Replies: 4
Views: 64

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?
by Quynh Vo
Sun Oct 13, 2019 9:51 pm
Forum: Photoelectric Effect
Topic: Intensity vs. Length of Waves
Replies: 4
Views: 60

Intensity vs. Length of Waves

What is the difference between higher intensity light and a shorter wavelength?
by Quynh Vo
Sun Oct 13, 2019 9:47 pm
Forum: Properties of Electrons
Topic: wave-like vs particle-like
Replies: 2
Views: 25

Re: wave-like vs particle-like

Electrons have wave-like properties because like a wave, when electron passes through a crystal, there are diffractions.
by Quynh Vo
Sun Oct 13, 2019 9:42 pm
Forum: Photoelectric Effect
Topic: Threshold Energy
Replies: 4
Views: 64

Re: Threshold Energy

Yes, threshold energy is totally different depending on which element it is.
by Quynh Vo
Sun Oct 13, 2019 9:38 pm
Forum: Properties of Light
Topic: Frequency vs. Intensity
Replies: 4
Views: 35

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.
by Quynh Vo
Mon Oct 07, 2019 5:22 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental F.19
Replies: 3
Views: 62

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?
by Quynh Vo
Sat Oct 05, 2019 5:36 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Theoretical Yield
Replies: 9
Views: 170

Re: Calculating Theoretical Yield

The theoretical yield is the best possible outcome which means it would have to use the entire limiting reagent.
by Quynh Vo
Sat Oct 05, 2019 5:35 pm
Forum: Limiting Reactant Calculations
Topic: Explaining why a reactant is limiting
Replies: 4
Views: 98

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.
by Quynh Vo
Sat Oct 05, 2019 5:33 pm
Forum: Limiting Reactant Calculations
Topic: Textbook M15-Calculation?
Replies: 3
Views: 61

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.
by Quynh Vo
Sat Oct 05, 2019 5:21 pm
Forum: Balancing Chemical Reactions
Topic: Understanding how to get whole #s [ENDORSED]
Replies: 18
Views: 251

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.
by Quynh Vo
Sat Oct 05, 2019 5:09 pm
Forum: SI Units, Unit Conversions
Topic: Sig figs
Replies: 5
Views: 77

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.

Go to advanced search