Search found 27 matches

by 004985802
Fri Jun 08, 2018 1:56 pm
Forum: Hybridization
Topic: Energy levels
Replies: 6
Views: 267

Re: Energy levels

you don't include the energy levels because your only looking at electron density in the valence shell
by 004985802
Fri Jun 08, 2018 1:54 pm
Forum: Hybridization
Topic: Pi bonds in triple bond
Replies: 17
Views: 440

Re: Pi bonds in triple bond

one sigma bond two pi bonds
by 004985802
Fri Jun 08, 2018 1:52 pm
Forum: Hybridization
Topic: VSEPR
Replies: 11
Views: 521

Re: VSEPR

Valence Shell Electron Pair Repulsion Model
by 004985802
Sun Jun 03, 2018 8:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: regions of e- density
Replies: 4
Views: 132

Re: regions of e- density

yes since these regions determine the orientation of forces on the atoms within the molecule and thus how they conform to make the shape of the molecule
by 004985802
Sun Jun 03, 2018 8:41 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 5
Views: 196

Re: Sigma and Pi Bonds

by the nature of the bonding/location of electrons and the shape of their orbit
by 004985802
Sun Jun 03, 2018 8:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis and trans
Replies: 7
Views: 218

Re: cis and trans

cis molecules have side groups of atoms on the same side of a molecule whereas trans molecules have groups on opposite sides of the molecule
by 004985802
Sun May 20, 2018 2:20 pm
Forum: Lewis Structures
Topic: Dots vs lines to represent electrons
Replies: 8
Views: 283

Re: Dots vs lines to represent electrons

lines represent bonds not just pairs of electrons. denoting electron pairs as lines instead of dots would be inaccurate and confusing in showing atomic and molecular structure
by 004985802
Sun May 20, 2018 2:16 pm
Forum: Ionic & Covalent Bonds
Topic: Octet rule
Replies: 17
Views: 534

Re: Octet rule

that atoms prefer a more stable state of 8 valence electrons (and they lose or gain electrons through bonding or ionization to have full valence shells)
by 004985802
Sun May 20, 2018 2:11 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 9
Views: 432

Re: Resonance Structures

Usually the formal charges will not be consistent because the electron distribution varies between resonance structures
by 004985802
Sun May 13, 2018 12:27 pm
Forum: Lewis Structures
Topic: Electron Configuration
Replies: 6
Views: 250

Re: Electron Configuration

d is only present in the 3rd energy level and higher because in each energy level (1-4) an orbital (s p d f) is added. The first energy level only has an s orbital, the second has s and p, and the third has s, p, and d.
by 004985802
Sun May 13, 2018 12:25 pm
Forum: Lewis Structures
Topic: Octet
Replies: 3
Views: 154

Re: Octet

because they have less than 8 electrons so they don't fill valence s and p orbitals
by 004985802
Sun May 13, 2018 12:24 pm
Forum: Lewis Structures
Topic: octect rule
Replies: 4
Views: 148

Re: octect rule

atoms only break the octet rule when moving additional electrons to the d or f orbitals make the atom more stable, which can be determined by calculating formal charges to determine how many electrons are required
by 004985802
Sat May 05, 2018 7:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Valence Shell Configuration (2.55)
Replies: 2
Views: 121

Re: Valence Shell Configuration (2.55)

ground state electron configuration accounts for all electrons in the atom at its non ionized state, while valence electrons/diagrams only account for the electrons in the outer orbitals of the atom (at an ionized or ground state)
by 004985802
Sat May 05, 2018 7:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Lewis Structure [ENDORSED]
Replies: 7
Views: 258

Re: Lewis Structure [ENDORSED]

valence electrons are normally written with both s dots on the right then p going: top, left, bottom, top, left, bottom but it doesn't really matter as long as you are keeping track and staying consistent
by 004985802
Sat May 05, 2018 7:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Half filled exception
Replies: 3
Views: 273

Re: Half filled exception

it may have been referring to the d block favoring being half or fully filled (meaning having d^5 or d^10) so if the atom has two electrons in the valence s orbital and 4 or 9 electrons in the d valence orbital, an electron will move from the s to the d orbital to have it half or fully filled
by 004985802
Thu Apr 26, 2018 7:46 pm
Forum: DeBroglie Equation
Topic: DeBroglie
Replies: 7
Views: 261

Re: DeBroglie

you would use this to measure the wavelength of a moving object that has mass in order to determine whether it has wavelike properties
by 004985802
Thu Apr 26, 2018 7:45 pm
Forum: Properties of Electrons
Topic: electron mass
Replies: 15
Views: 568

Re: electron mass

mass of e =9.1095x10^-31 kg
it depends on the degree of the precision of your measurement but, yes, this small mass can make a difference
by 004985802
Thu Apr 26, 2018 7:43 pm
Forum: Properties of Electrons
Topic: Question about n and energy levels
Replies: 3
Views: 202

Re: Question about n and energy levels

yes n is the energy level of the electron or the distance between the electron's orbit and the nucleus
by 004985802
Thu Apr 19, 2018 8:13 pm
Forum: Properties of Light
Topic: still don't uderrsatnd what a photon is [ENDORSED]
Replies: 20
Views: 411

Re: still don't uderrsatnd what a photon is [ENDORSED]

a photon is the movement of energy in a wavelike motion which is seen as visible light at some frequencies
by 004985802
Thu Apr 19, 2018 8:10 pm
Forum: Photoelectric Effect
Topic: Threshold Energy [ENDORSED]
Replies: 12
Views: 375

Re: Threshold Energy [ENDORSED]

it is the energy required to move an electron from one state (energy level) to the next. If the input energy is less than threshold, the electron will remain at the same state (energy level).
by 004985802
Thu Apr 19, 2018 8:07 pm
Forum: Photoelectric Effect
Topic: What is a vacuum?
Replies: 7
Views: 243

Re: What is a vacuum?

Vacuum is a space the is completely empty (so that no other particles or forces are present that could affect the state of the substance you're investigating)
by 004985802
Thu Apr 12, 2018 8:16 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 9
Views: 448

Re: Limiting Reactant

using molar mass you can find the ratio of moles you are able to use (max) of a limiting reactant in a chemical equation to the amount in the equation, and apply that ratio to other chemicals/compounds to see how much of their total molar mass will be consumed in the reaction (and use their molar ma...
by 004985802
Thu Apr 12, 2018 8:11 pm
Forum: Significant Figures
Topic: Scientific notation [ENDORSED]
Replies: 7
Views: 374

Re: Scientific notation [ENDORSED]

for your final answer, scientific notation is best because it makes the size/scale of your result clear, however it is not necessary in your calculations if you prefer doing math with large numbers/decimals
by 004985802
Thu Apr 12, 2018 8:09 pm
Forum: SI Units, Unit Conversions
Topic: Chemical Formulas [ENDORSED]
Replies: 11
Views: 415

Re: Chemical Formulas [ENDORSED]

you don't have to memorize any chemical formulas now
by 004985802
Thu Apr 12, 2018 8:07 pm
Forum: SI Units, Unit Conversions
Topic: Temperature
Replies: 5
Views: 267

Re: Temperature

the three temp scales (F,C,K) vary because their scale makes different types of thermal measurement easier. For example, while F can show more minute changes in temp per degree, the scale of C is based off the boiling and freezing points of water (so it is better for math involving solutions in chem...
by 004985802
Thu Apr 12, 2018 8:01 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs Precision
Replies: 23
Views: 776

Re: Accuracy vs Precision

accuracy measures how close your results are to the true value, and precision measures how exact and consistent your results are
by 004985802
Thu Apr 12, 2018 7:56 pm
Forum: Significant Figures
Topic: Why are sig figs important?
Replies: 13
Views: 1356

Re: Why are sig figs important?

sig figs are important because they retain the accuracy of your calculations so that differences in measurement or calculation which could be a result of error will not impact the accuracy of your final result

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