Search found 31 matches
- Sat Dec 08, 2018 8:37 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 Points
- Replies: 1
- Views: 459
Boiling Points
How do you compare boiling points?
- Sat Dec 08, 2018 8:34 pm
- Forum: Lewis Structures
- Topic: Molecular Geometry
- Replies: 2
- Views: 538
Molecular Geometry
What are the bond angles for T-shape?
- Sat Dec 08, 2018 8:33 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Diamagnetic vs. Paramagnetic
- Replies: 1
- Views: 462
Diamagnetic vs. Paramagnetic
How do you determine if an element is diamagnetic or paramagnetic?
- Sat Dec 01, 2018 8:37 pm
- Forum: Dipole Moments
- Topic: net dipole
- Replies: 2
- Views: 344
net dipole
How do you determine if a molecule has a net dipole?
- Sat Dec 01, 2018 8:36 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: polarizing power and polarizability
- Replies: 5
- Views: 702
polarizing power and polarizability
What is the best way to compare the polarizability between anions? What about the polarizing power of cations?
- Sat Dec 01, 2018 8:33 pm
- Forum: Hybridization
- Topic: lone pairs
- Replies: 20
- Views: 2164
lone pairs
Are lone pairs taken into consideration when determining the hybridization of a central atom?
- Sat Nov 24, 2018 8:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: freely rotating bonds
- Replies: 1
- Views: 223
Re: freely rotating bonds
This is because a pi bond does not allow free rotation. Unlike sigma bonds, pi bonds are rigid and cannot twist because if they were able to, the pi bonds would break since they're weaker than sigma bonds. Double bonds consist of a sigma bond in the middle and a pi bond with two lobes. Triple bonds ...
- Sat Nov 24, 2018 8:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lewis Structure of IO3 (-)
- Replies: 1
- Views: 476
Lewis Structure of IO3 (-)
Is the following Lewis structure for IO3 (-) correct? I as the central atom. Each O atom is double bonded to the I atom. I has one lone pair. In the solutions manual (problem 4.13 part c), each O atom is single bonded to the I atom and I has one lone pair. It's also indicated that resonance forms ar...
- Sat Nov 24, 2018 8:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HCH bond angles 4.73
- Replies: 2
- Views: 3114
Re: HCH bond angles 4.73
Since all of these species are expected to be diamagnetic, none are radicals. The Lewis structure of each species will help determine the order of increasing H-C-H bond angle. The molecular shape and bond angle of each species is as follows: CH3 + is trigonal planar (120 degrees); CH4 is tetrahedral...
- Sun Nov 18, 2018 5:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electrostatic potential
- Replies: 2
- Views: 323
Re: Electrostatic potential
The distribution of electric charge in a molecule affects its physical and chemical properties. Polar molecules interact with electrostatic potential (created by a cation or an anion), which is the energy needed to move a charge against its electrical field (which would be the charge of the particle...
- Sun Nov 18, 2018 5:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.3 6th edition
- Replies: 2
- Views: 276
Re: 4.3 6th edition
a) HCN has a total of 10 valence electrons. Since C has the smallest ionization energy, it is the central atom. H can only single bond with C, and C triple bonds with N, in addition to N's lone pair. Since there are only 2 regions of electron density, HCN's shape is linear. b) CH2F2 has a total of 2...
- Sun Nov 18, 2018 5:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.7 6th edition
- Replies: 2
- Views: 2714
Re: 4.7 6th edition
a) SOCl2 has 26 valence electrons, so once the Lewis structure has been drawn, there should be 4 regions of electron density around the central atom. The central atom, Sulfur, will have 3 bonding pairs and 1 lone pair. Since only 3 out of 4 positions are occupied by atoms, we name the shape trigonal...
- Sun Nov 11, 2018 5:09 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate Covalent Bond formation
- Replies: 3
- Views: 600
Re: Coordinate Covalent Bond formation
Some compounds with fewer than eight electrons present around an atom form coordinate covalent bonds with other atoms of the same type which have lone pairs of electrons to donate in order to make them stable.
These rare compounds are highly reactive.
These rare compounds are highly reactive.
- Sun Nov 11, 2018 4:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: Van der Waals vs Dispersion Forces
- Replies: 8
- Views: 1186
Re: Van der Waals vs Dispersion Forces
London dispersion forces are a type of Van der Waal’s forces. These forces always operate in any substance. In general, the heavier the molecule, the stronger the Van der Waal's force of interaction. So the two terms aren't completely synonymous? A London dispersion force is a type of van de waal's...
- Sun Nov 11, 2018 4:20 pm
- Forum: Bond Lengths & Energies
- Topic: Molar mass and attractive interactions
- Replies: 3
- Views: 435
Re: Molar mass and attractive interactions
Heavier (i.e. large molar mass) molecules contain more electrons and thus have a larger and more polarizable electron cloud. This ultimately results in that molecule's greater possibility of intermolecular interaction by dispersion forces.
- Sun Nov 11, 2018 4:09 pm
- Forum: Ionic & Covalent Bonds
- Topic: Van der Waals vs Dispersion Forces
- Replies: 8
- Views: 1186
Re: Van der Waals vs Dispersion Forces
London dispersion forces are a type of Van der Waal’s forces. These forces always operate in any substance. In general, the heavier the molecule, the stronger the Van der Waal's force of interaction.
- Sat Nov 03, 2018 8:54 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Test 2 1b
- Replies: 2
- Views: 518
Test 2 1b
How does the change in uncertainty in momentum affect the uncertainty in its wavelength?
Does this relate to the de Broglie equation?
Does this relate to the de Broglie equation?
- Sat Nov 03, 2018 8:28 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Radial vs. Angular Nodes
- Replies: 1
- Views: 1592
Radial vs. Angular Nodes
What's the difference between radial and angular nodes and how do you determine the number of each?
- Sat Nov 03, 2018 8:26 pm
- Forum: DeBroglie Equation
- Topic: Practice Midterm 6a
- Replies: 1
- Views: 563
Re: Practice Midterm 6a
Yes, you would use the de Broglie equation for this question. You would calculate the mass by multiplying the molar mass given, 3.157 g/mol, by 1kg/1000 g, and then multiplying the result by 6.022x10^23 mol^-1 to receive a final total mass of 5.2424x10^-27 kg.
- Fri Oct 26, 2018 1:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energy vs. Electronegativity
- Replies: 5
- Views: 557
Re: Ionization Energy vs. Electronegativity
Ionization energy is defined as the energy needed to remove an electron from an atom (in the gas phase). Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. The periodic trend for the ionization energy and electronegativity is the same, however, as they...
- Fri Oct 26, 2018 1:10 pm
- Forum: Lewis Structures
- Topic: writing the structure
- Replies: 5
- Views: 584
Re: writing the structure
No, it does not matter which side you begin placing dots on.
- Fri Oct 26, 2018 12:40 pm
- Forum: Lewis Structures
- Topic: Lewis Dot Order
- Replies: 10
- Views: 1266
Re: Lewis Dot Order
No; as long as you don't have more than 2 dots on a side, it should be fine.
- Sun Oct 21, 2018 3:06 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Electrons and their transitional abilities
- Replies: 1
- Views: 267
Re: Electrons and their transitional abilities
When an electron gets hit by a photon of light, it absorbs the quanta of energy carried by the photon, thus moving to a higher energy state. This means that the electron moves to a different orbital to accommodate its change in wavelength.
- Sun Oct 21, 2018 3:00 pm
- Forum: Properties of Light
- Topic: SI Units
- Replies: 6
- Views: 635
Re: SI Units
An important unit conversion needed for Test 2 is J=kg⋅m2⋅s−2.
- Sun Oct 21, 2018 2:52 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 3
- Views: 714
Re: Quantum Numbers
The first three quantum numbers are always integers, but the last quantum number indicating electron spin is a fraction/decimal of either + or - 1/2 (or 0.5).
- Thu Oct 11, 2018 9:32 pm
- Forum: Significant Figures
- Topic: sig figs in periodic table
- Replies: 6
- Views: 804
Re: sig figs in periodic table
The amount of significant figures in your final answer should be based on the significant figures given in the problem, not the periodic table. However, you would only use the least number of significant figures when using multiplication and/or division to solve the problem. For problems solved thro...
- Thu Oct 11, 2018 9:19 pm
- Forum: Properties of Light
- Topic: speed of light
- Replies: 8
- Views: 680
Re: speed of light
The exact speed of light is 299,792,458 m/s, but for our purposes, 3.0x10^8 m/s is perfectly fine as well.
- Thu Oct 11, 2018 9:13 pm
- Forum: Properties of Electrons
- Topic: Homework Questions Ch1 #7
- Replies: 2
- Views: 275
Re: Homework Questions Ch1 #7
Hz is the derived SI unit of frequency and nanometer is a unit of length in the metric system, so we cannot convert between the two. However, Hz can be rewritten as s^-1. By using the formula λ(wavelength) = c(speed of light)/v(frequency), the units will eventually cancel out and leave you with m, w...
- Fri Oct 05, 2018 1:30 am
- Forum: Empirical & Molecular Formulas
- Topic: Empirical formula from MPC
- Replies: 3
- Views: 246
Re: Empirical formula from MPC
Molecules must have whole atoms, so anytime the values we obtain after dividing the moles by the smallest number of moles aren't whole or at least near whole numbers, we must multiply the values by a number that would result in whole numbers. For the example you have provided, we would need to multi...
- Fri Oct 05, 2018 1:17 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E5 (b)
- Replies: 1
- Views: 207
Re: E5 (b)
Using your answer from part a (1.2*10^-14 mol),
time = (1 mol peas/1.2*10^-14 mol.s^-1) = 8.3x10^13 s
(8.3x10^13 s)(1 h/3600 s)(1 day/24 h)(1 yr/365 days) = 2.6x10^6 years
time = (1 mol peas/1.2*10^-14 mol.s^-1) = 8.3x10^13 s
(8.3x10^13 s)(1 h/3600 s)(1 day/24 h)(1 yr/365 days) = 2.6x10^6 years
- Fri Oct 05, 2018 12:56 am
- Forum: Balancing Chemical Reactions
- Topic: notation
- Replies: 4
- Views: 503
Re: notation
It is a good idea to get in the habit of writing the states of matter because this information is very important when working with equilibrium constant expressions, as pure solids and liquids are not included in the expression.