CHEMISTRY COMMUNITY

Stephen Sirmay 1I

When writing the composition of a sigma bond, I understand that you write the atom involved in the bind, the hybridization according to the number of electron density around that atom, and include the number associated with the period of that element. For example, sigma( C 2sp2, ...). However if we ...

Stephen Sirmay 1I

If you think of the structure of the square planar molecule, the lone pairs lie 180 degrees apart at the bottom and top of the structure and the four bonded atoms are in the equatorial plane in the form of a square. Generally a lone pair will distort the angles between the bonded atoms, however beca...

Stephen Sirmay 1I

Equatorial bonds are perpendicular to axis of the ring. Axial bonds are parallel to the axis of the ring.

Stephen Sirmay 1I

In question 4.13 6th edition the problem asks for VSEPR of I3^- (iodine 3, 1 negative charge). The lewis structure in the solution shows 2 bonds with 3 lone pairs. However, couldn't the lewis structure be 2 triple bonds and one lone pair, changing the shape to bent?

Stephen Sirmay 1I

I'm confused on the VSEPR of AXE. I'm assuming the electronic geometry is linear because it has 2 regions of electron density, but I'm confused about the molecular shape. Mozt of the VSEPR charts I saw online do not even have this classification. Does AXE exist and what is its molecular shape?

Stephen Sirmay 1I

trigonal planar has 3 regions of electron density, while trigonal pyramidal has 4. Their hybridizations are sp2 and sp3 respectively. Trigonal pyramidal has alone pair attachment.

Stephen Sirmay 1I

Bases donate pairs of electrons and acids accept pairs of electrons. A Lewis acid is therefore any substance, such as the H+ ion, that can accept a pair of nonbonding electrons. In other words, a Lewis acid is an electron-pair acceptor. A Lewis base is any substance, such as the OH- ion, that can do...

Stephen Sirmay 1I

Remember that determining molecular shape is based on the number of regions of electron density around the central atom, not necessarily the number of elements associated with the ion.

Stephen Sirmay 1I

When analyzing a lewis structure of a given compound, what feature most obviously determines whether or not it is polar?

Stephen Sirmay 1I

The shaded triangle and the hatched triangle are opposites. Shaded illustrates a bond that is in front of the central atom, while hatched illustrates a bond behind the central atom.

Stephen Sirmay 1I

Can an octahedral also be classified as square bipyramidal? In the same way that a trigonal bipyramidal is named fittingly for its shape, couldn't an octahedral be named this?

Stephen Sirmay 1I

When you have bonding pairs including a lone pair, for example four bonding pairs and one lone pair, the correct shape is that with the least amount of repulsion (more stable). This may be why the trend you're talking about is broken. 5 pairs electrons are located in trigonal bipyramidal geometry. L...

Stephen Sirmay 1I

Putting electrons on the central atom all depends on the total valence electrons and the position of the central atom on the periodic table. If the central atom is in period 3 it has an exception to the octet rule due to the 3d orbital being empty, in these cases it's likely you would put lone pair ...

Stephen Sirmay 1I

Based on what we learned today, a central atom with 3 bonding pairs would be trigonal planar, with all elements havong angles of 120 degrees.

Stephen Sirmay 1I

I have in my notes that Instantaneous dipoles in two nearby rod shaped molecules are closer and therefore stronger than those in two nearby spherical shapes . Hope this helps!

Stephen Sirmay 1I

Schrodingers Eqaution is an equation regarding wavelength. ψ= wave function (orbital) representing e- Represents the height of a wave at position x,y,z ψ^2 represents the probability of finding an e- I wouldnt be surprised if there was a question on the midterm regarding this relation to orbitals or...

Stephen Sirmay 1I

Cl is not at the center of the Lewis Structure for HClO, O is at the center and O is most electronegative

Stephen Sirmay 1I

It is my understanding that the lectures corresponding to the midterm ended on Wednesday October 31, so I don't believe they are.

Stephen Sirmay 1I

ψ= wave function (orbital) representing e-
Represents the height of a wave at position x,y,z
ψ^2 represents the probability of finding an e-

Stephen Sirmay 1I

Atomic spectra (electronic transitions between atomic orbitals) apply to molecular spectra (electronic transitions between molecular orbitals) Electrons in both atoms and molecules can be excited to higher energy states (n=1,2, etc.) so when they emit electromagnetic radition, it gives detail to spe...

Stephen Sirmay 1I

Although they may not be detectable, the wavelength can be calculated. A car for example, does have mass and could have velocity and therefore could apply to the equation, the wavelength will not be detectable however.

Stephen Sirmay 1I

When calculating wavelength using the formula wavelength= h/(mass x velocity), I'm uncertain what units my given mass should be? I noticed that the Joules contains the units kg, so would that mean my mass needs to be in units of kg to cancel out, resulting in a end result unit of wavelength mass? Or...

Stephen Sirmay 1I

Start with identifying the principle quantum number (n) to determine the shell
Next identify the shape using the allowed values: l= 0,1,2,..., n-1
Use the l you calculated to find the different orbitals of a subshell (ml)
ml has the allowed values: ml= l, l-1, ..., -l

Stephen Sirmay 1I

After reviewing my lecture notes, I'm having trouble understanding how protons have momentum if they don't have mass?

Stephen Sirmay 1I

I have in my notes that (E=hv) - work function = (Ek= 1/2me-ve^2), however there was mention of threshold energy that I didn't quite understand. What is this threshold energy and how does it factor in to the above equation?

Stephen Sirmay 1I

Theoretical yield can be calculated by 1. balancing chemical equation 2. finding moles of reactant 3. use molar ratio of reactants from balanced equation to find how many moles it takes each reactant to use up the other 4. the reactant with not enough moles to use up the other is the limiting reacta...

Stephen Sirmay 1I

After calculating the moles of each reactant, use the lowest number of moles to help find the limiting reagent. Alternatively, use a molar ratio from the balanced chemical equation to determine how much of each product is needed to use up the others, the reactant without enough moles to use up the o...

Stephen Sirmay 1I

In regards to a limiting reactant problem, you won't always be asked to calculate percent yield, as it may just be asking you to determine whether a limiting reactant is present. However, if asked to find percent yield, the most efficient way in my opinion is as follows: 1. Balance equation 2. Calcu...

Stephen Sirmay 1I

After reviewing SI units in lecture today, I realized that Hecto (10^2) was not listed. Does this mean this unit is rarely used, or not even an SI unit at all?

Stephen Sirmay 1I

The rule for trailings zeroes for sig figs can be a little misleading, but the best indicator is always the presence or absence of a decimal point. Lack of a decimal point can lead to uncertainty, but any time there is a decimal point, count the trailing zeroes regardless of whether they are before ...

CHEMISTRY COMMUNITY

Search found 30 matches

sigma composition

Re: Square Planar

Re: Axial and equatorial atoms

4.13 homework

AXE vsepr

Re: Trigonal Shape

Re: How do we know something is a lewis acid or base?

Re: 4.19 6th edition

Polarity

Re: Distance from Central Atom

Octahedral

Re: VSEPR Models with 5 bonding regions

Re: Electrons on Least EN Atom

Re: Placement of Elements?

Re: Boiling point

Re: Midterm

Re: The center atom

Re: Midterm Dipole Moments?

Re: Schrodinger and quantum numbers

Re: atomic orbital and molecular orbital?

Re: wavelike properties

Wavelength unit conversion

Re: How to Find the Number of Orbitals

Momentum of protons

Threshold energy

Re: Percent Yield [ENDORSED]

Re: Limiting Reagent

Re: Limiting Reactant

Hecto as SI Unit [ENDORSED]

Re: Number of Sig Fig