Search found 31 matches

by Moryel Yashar 1J
Sat Dec 08, 2018 8:34 pm
Forum: Lewis Structures
Topic: Molecular Geometry
Replies: 2
Views: 231

Molecular Geometry

What are the bond angles for T-shape?
by Moryel Yashar 1J
Sat Dec 08, 2018 8:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Diamagnetic vs. Paramagnetic
Replies: 1
Views: 201

Diamagnetic vs. Paramagnetic

How do you determine if an element is diamagnetic or paramagnetic?
by Moryel Yashar 1J
Sat Dec 01, 2018 8:37 pm
Forum: Dipole Moments
Topic: net dipole
Replies: 2
Views: 110

net dipole

How do you determine if a molecule has a net dipole?
by Moryel Yashar 1J
Sat Dec 01, 2018 8:36 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizing power and polarizability
Replies: 5
Views: 161

polarizing power and polarizability

What is the best way to compare the polarizability between anions? What about the polarizing power of cations?
by Moryel Yashar 1J
Sat Dec 01, 2018 8:33 pm
Forum: Hybridization
Topic: lone pairs
Replies: 20
Views: 314

lone pairs

Are lone pairs taken into consideration when determining the hybridization of a central atom?
by Moryel Yashar 1J
Sat Nov 24, 2018 8:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: freely rotating bonds
Replies: 1
Views: 43

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 ...
by Moryel Yashar 1J
Sat Nov 24, 2018 8:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structure of IO3 (-)
Replies: 1
Views: 66

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...
by Moryel Yashar 1J
Sat Nov 24, 2018 8:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HCH bond angles 4.73
Replies: 2
Views: 302

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...
by Moryel Yashar 1J
Sun Nov 18, 2018 5:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electrostatic potential
Replies: 2
Views: 76

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...
by Moryel Yashar 1J
Sun Nov 18, 2018 5:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.3 6th edition
Replies: 2
Views: 64

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...
by Moryel Yashar 1J
Sun Nov 18, 2018 5:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.7 6th edition
Replies: 2
Views: 71

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...
by Moryel Yashar 1J
Sun Nov 11, 2018 5:09 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond formation
Replies: 3
Views: 238

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.
by Moryel Yashar 1J
Sun Nov 11, 2018 4:26 pm
Forum: Ionic & Covalent Bonds
Topic: Van der Waals vs Dispersion Forces
Replies: 8
Views: 172

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...
by Moryel Yashar 1J
Sun Nov 11, 2018 4:20 pm
Forum: Bond Lengths & Energies
Topic: Molar mass and attractive interactions
Replies: 3
Views: 72

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.
by Moryel Yashar 1J
Sun Nov 11, 2018 4:09 pm
Forum: Ionic & Covalent Bonds
Topic: Van der Waals vs Dispersion Forces
Replies: 8
Views: 172

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.
by Moryel Yashar 1J
Sat Nov 03, 2018 8:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test 2 1b
Replies: 2
Views: 256

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?
by Moryel Yashar 1J
Sat Nov 03, 2018 8:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Radial vs. Angular Nodes
Replies: 1
Views: 235

Radial vs. Angular Nodes

What's the difference between radial and angular nodes and how do you determine the number of each?
by Moryel Yashar 1J
Sat Nov 03, 2018 8:26 pm
Forum: DeBroglie Equation
Topic: Practice Midterm 6a
Replies: 1
Views: 273

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.
by Moryel Yashar 1J
Fri Oct 26, 2018 1:21 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy vs. Electronegativity
Replies: 5
Views: 97

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...
by Moryel Yashar 1J
Fri Oct 26, 2018 1:10 pm
Forum: Lewis Structures
Topic: writing the structure
Replies: 5
Views: 75

Re: writing the structure

No, it does not matter which side you begin placing dots on.
by Moryel Yashar 1J
Fri Oct 26, 2018 12:40 pm
Forum: Lewis Structures
Topic: Lewis Dot Order
Replies: 10
Views: 94

Re: Lewis Dot Order

No; as long as you don't have more than 2 dots on a side, it should be fine.
by Moryel Yashar 1J
Sun Oct 21, 2018 3:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electrons and their transitional abilities
Replies: 1
Views: 58

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.
by Moryel Yashar 1J
Sun Oct 21, 2018 3:00 pm
Forum: Properties of Light
Topic: SI Units
Replies: 6
Views: 181

Re: SI Units

An important unit conversion needed for Test 2 is J=‎kg⋅m2⋅s−2.
by Moryel Yashar 1J
Sun Oct 21, 2018 2:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 3
Views: 81

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).
by Moryel Yashar 1J
Thu Oct 11, 2018 9:32 pm
Forum: Significant Figures
Topic: sig figs in periodic table
Replies: 6
Views: 269

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...
by Moryel Yashar 1J
Thu Oct 11, 2018 9:19 pm
Forum: Properties of Light
Topic: speed of light
Replies: 8
Views: 158

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.
by Moryel Yashar 1J
Thu Oct 11, 2018 9:13 pm
Forum: Properties of Electrons
Topic: Homework Questions Ch1 #7
Replies: 2
Views: 85

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...
by Moryel Yashar 1J
Fri Oct 05, 2018 1:30 am
Forum: Empirical & Molecular Formulas
Topic: Empirical formula from MPC
Replies: 3
Views: 74

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...
by Moryel Yashar 1J
Fri Oct 05, 2018 1:17 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E5 (b)
Replies: 1
Views: 68

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
by Moryel Yashar 1J
Fri Oct 05, 2018 12:56 am
Forum: Balancing Chemical Reactions
Topic: notation
Replies: 4
Views: 193

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.

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