Search found 30 matches
- Fri Dec 07, 2018 12:54 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 7
- Views: 591
Re: Coordination Number
The coordination number is the number of ligands bonded to the central atom. The oxidation number is the charge on the transition metal in the coordination compound.
- Fri Dec 07, 2018 12:49 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to tell if something is a chelate
- Replies: 6
- Views: 584
Re: How to tell if something is a chelate
A chelate forms when a plydentate ligands forms multiple coordinate covalent bonds with a central metal atom.
- Sun Dec 02, 2018 4:39 pm
- Forum: Hybridization
- Topic: CH2O hybridization
- Replies: 9
- Views: 15255
Re: CH2O hybridization
Since CH2O is trigonal planar, there are three regions of electron density. Hence, there are 3 hybrid orbitals corresponding to sp2 hybridization.
- Sun Dec 02, 2018 4:37 pm
- Forum: Hybridization
- Topic: 2s or s?
- Replies: 7
- Views: 645
Re: 2s or s?
The coefficent number in front represents the period the atom is in, while the S is refering to the orbital.
- Sun Dec 02, 2018 4:35 pm
- Forum: Hybridization
- Topic: Hybridization Notation
- Replies: 10
- Views: 896
Re: Hybridization Notation
Both methods are correct
- Sun Dec 02, 2018 4:30 pm
- Forum: Hybridization
- Topic: lone pairs
- Replies: 20
- Views: 2028
Re: lone pairs
Yes, since lone pairs are a region of electron density it is taken into account for hybridization.
- Sun Nov 25, 2018 12:29 am
- Forum: Hybridization
- Topic: Electron Density vs Shape?
- Replies: 6
- Views: 673
Re: Electron Density vs Shape?
Electron density refers to regions that have bonding electrons or lone pairs, which gives you the molecular orbital geometry. The VSEPR geometry only refers to the bonded electrons, or atoms.
- Sun Nov 25, 2018 12:23 am
- Forum: Hybridization
- Topic: double bonds
- Replies: 14
- Views: 1182
Re: double bonds
Single bonds consist of a sigma bond, double bonds consist of a sigma and a pi bond, and triple bonds consist of a sigma bond and two pi bonds.
- Sun Nov 25, 2018 12:16 am
- Forum: Hybridization
- Topic: reason for hybridization
- Replies: 9
- Views: 10117
Re: reason for hybridization
Since hybridized orbitals have less energy than unhybridized orbitals, it results in more stable compounds.
- Wed Nov 14, 2018 7:18 pm
- Forum: Lewis Structures
- Topic: Formal Charge
- Replies: 14
- Views: 1272
Re: Formal Charge
Generally, the more electronegative atoms have charges and the central atoms dont have charges for it to be most stable.
- Wed Nov 14, 2018 7:12 pm
- Forum: Lewis Structures
- Topic: Expanded Octets
- Replies: 9
- Views: 2803
Re: Expanded Octets
Any element in period 3 or below can have expanded octets as they can expand into the d-orbitals.
- Wed Nov 14, 2018 7:11 pm
- Forum: Lewis Structures
- Topic: Boron Trifluoride
- Replies: 8
- Views: 806
Re: Boron Trifluoride
Boron is one of the exceptions to the octet rule.
- Sun Nov 11, 2018 1:31 am
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 5
- Views: 696
Re: Bond Lengths
If you are given bond lengths, the smaller value is the double bond and the higher value is the single bond. If it is a resonance structure, you find the average of the values.
- Sun Nov 11, 2018 1:29 am
- Forum: Ionic & Covalent Bonds
- Topic: Proportionality of bond strength
- Replies: 3
- Views: 511
Re: Proportionality of bond strength
Since electon repulsion increases as the number of bonds increase, the higher number of bonds will not be as effective at pairing as those with lower number of bonds, thus explaining why lower number of bonds have higher strength and require more energy to break.
- Sun Nov 11, 2018 1:22 am
- Forum: Ionic & Covalent Bonds
- Topic: delta positive delta negative
- Replies: 15
- Views: 2294
Re: delta positive delta negative
The more elctronegative atom accepts electrons so it is more negatively charged, hence delta negative. The atom that donates the elctrons becomes positively charged, or delta positive.
- Sun Nov 04, 2018 6:48 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 14
- Views: 2200
Re: Work Function
Using the equation, Energy of photon = work function + kinetic energy, you can solve for work function given the other variables.
- Sun Nov 04, 2018 6:46 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 11
- Views: 1008
Re: Lewis Structures
The atom with the lowest ionization energy is the central atom.
- Sun Nov 04, 2018 6:42 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 4
- Views: 425
Re: Electronegativity
Yes electronegativy and electron affinity both increase across due to a stronger nuclear attraction and decrease down as the number of shells increase making electrons further away from the nucleus.
- Sun Oct 28, 2018 11:41 pm
- Forum: Properties of Light
- Topic: Electromagnetic Spectrum
- Replies: 5
- Views: 635
Re: Electromagnetic Spectrum
The EM spectrum regions should be known, but it is not neccesary to know each range of values. From highest energy (shortest wavelength) to lowest energy (highest wavelength), the spectrum is as follows: gamma rays, x-rays, ultraviolet light, visible light, infrared rays, microwaves, radio waves.
- Sun Oct 28, 2018 11:34 pm
- Forum: Properties of Light
- Topic: Photoelectric Effect
- Replies: 8
- Views: 911
Re: Photoelectric Effect
The photoelectric effect is the emission of electrons from the radiation of a light that is greater than the threshold energy. It showed that intensity does not affect the ejection of light, but that one photon interacts with one electron.
- Sun Oct 28, 2018 11:32 pm
- Forum: Properties of Light
- Topic: Is light in waves or photons?
- Replies: 10
- Views: 946
Re: Is light in waves or photons?
Light has properties of waves as displayed in diffraction patterns that are shown when light passes through a crystal and particles as seen in the photoelectric effect.
- Sun Oct 21, 2018 3:21 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Schrodinger's Wave Function
- Replies: 10
- Views: 928
Re: Schrodinger's Wave Function
No you do not need to calculations of the equation as it is advanced math, but know the conceptual implications of the equation regarding orbitals and wave functions
- Sun Oct 21, 2018 3:00 pm
- Forum: Properties of Electrons
- Topic: Wavelength Calculations
- Replies: 5
- Views: 620
Re: Wavelength Calculations
When we combine the equations E=hv and c=λv, we get E=hc/λ. Hence, we get the constants, h, Planck's constant (6.626x10^-34Js) multiplied by c, the speed of light (3.00x10^8 m/s).
- Sun Oct 21, 2018 2:25 pm
- Forum: Properties of Light
- Topic: Calculating the wavelength of light
- Replies: 7
- Views: 1157
Re: Calculating the wavelength of light
Both options are correct and can be used on the exam, but 2.998 x 10^8 will be more precise.
- Sun Oct 14, 2018 3:49 pm
- Forum: Balancing Chemical Reactions
- Topic: Mole Coefficients in Chemical Equations
- Replies: 6
- Views: 727
Re: Mole Coefficients in Chemical Equations
While the mole coefficients may not be equal, this does not mean the equation is not balanced. Balancing equations deals with the same number of atoms/elements on the reactant and product side.
- Sat Oct 13, 2018 11:11 pm
- Forum: Empirical & Molecular Formulas
- Topic: Going from empirical to Molecular formula
- Replies: 14
- Views: 2153
Re: Going from empirical to Molecular formula
The value should be close to a whole number or if not very close so you can round to one.
- Sat Oct 13, 2018 11:02 pm
- Forum: Properties of Light
- Topic: E=hv
- Replies: 13
- Views: 1043
Re: E=hv
In this equation, E is the energy of light (photons) in Joules.
- Thu Oct 04, 2018 1:22 am
- Forum: Balancing Chemical Reactions
- Topic: Balancing reactions tips
- Replies: 29
- Views: 2067
Re: Balancing reactions tips
I tend to find the element that occurs the least and balancing from there as it makes the process way easier.
- Thu Oct 04, 2018 1:07 am
- Forum: Molarity, Solutions, Dilutions
- Topic: molarity conversion
- Replies: 7
- Views: 436
Re: molarity conversion
Yes, since molarity is expressed in moles/liter, ml should be changed to L to express the answer in the right units
- Wed Oct 03, 2018 11:29 pm
- Forum: Empirical & Molecular Formulas
- Topic: Definition of Empirical Formula
- Replies: 8
- Views: 616
Re: Definition of Empirical Formula
The empirical formula represents the most basic ratio of atoms in the formula.