CHEMISTRY COMMUNITY

Moryel Yashar 1J

How do you compare boiling points?

Moryel Yashar 1J

What are the bond angles for T-shape?

Moryel Yashar 1J

How do you determine if an element is diamagnetic or paramagnetic?

Moryel Yashar 1J

How do you determine if a molecule has a net dipole?

Moryel Yashar 1J

What is the best way to compare the polarizability between anions? What about the polarizing power of cations?

Moryel Yashar 1J

Are lone pairs taken into consideration when determining the hybridization of a central atom?

Moryel Yashar 1J

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 ...

Moryel Yashar 1J

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...

Moryel Yashar 1J

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...

Moryel Yashar 1J

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...

Moryel Yashar 1J

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...

Moryel Yashar 1J

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...

Moryel Yashar 1J

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.

Moryel Yashar 1J

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...

Moryel Yashar 1J

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.

Moryel Yashar 1J

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.

Moryel Yashar 1J

How does the change in uncertainty in momentum affect the uncertainty in its wavelength?

Does this relate to the de Broglie equation?

Moryel Yashar 1J

What's the difference between radial and angular nodes and how do you determine the number of each?

Moryel Yashar 1J

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.

Moryel Yashar 1J

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...

Moryel Yashar 1J

No, it does not matter which side you begin placing dots on.

Moryel Yashar 1J

No; as long as you don't have more than 2 dots on a side, it should be fine.

Moryel Yashar 1J

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.

Moryel Yashar 1J

An important unit conversion needed for Test 2 is J=‎kg⋅m2⋅s−2.

Moryel Yashar 1J

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).

Moryel Yashar 1J

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...

Moryel Yashar 1J

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.

Moryel Yashar 1J

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...

Moryel Yashar 1J

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...

Moryel Yashar 1J

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

Moryel Yashar 1J

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.

CHEMISTRY COMMUNITY

Search found 31 matches

Boiling Points

Molecular Geometry

Diamagnetic vs. Paramagnetic

net dipole

polarizing power and polarizability

lone pairs

Re: freely rotating bonds

Lewis Structure of IO3 (-)

Re: HCH bond angles 4.73

Re: Electrostatic potential

Re: 4.3 6th edition

Re: 4.7 6th edition

Re: Coordinate Covalent Bond formation

Re: Van der Waals vs Dispersion Forces

Re: Molar mass and attractive interactions

Re: Van der Waals vs Dispersion Forces

Test 2 1b

Radial vs. Angular Nodes

Re: Practice Midterm 6a

Re: Ionization Energy vs. Electronegativity

Re: writing the structure

Re: Lewis Dot Order

Re: Electrons and their transitional abilities

Re: SI Units

Re: Quantum Numbers

Re: sig figs in periodic table

Re: speed of light

Re: Homework Questions Ch1 #7

Re: Empirical formula from MPC

Re: E5 (b)

Re: notation