CHEMISTRY COMMUNITY

Alexis Bravo 1D

The oxidation number of a free element is always 0. The oxidation number of a monatomic ion equals the charge of the ion. The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements. The oxidation number of O in compounds is usually -2, but it is -1 in peroxides...

Alexis Bravo 1D

To find the electron density you would use the Lewis structure and count the areas of electron density around the central atom. You would do this by counting each double and triple bond as one area of high electron density and every lone pair as an area of high electron density.

Alexis Bravo 1D

The nonpolar molecules are those in which the forces cancel out and the polar molecules are molecules that have unequal dipole charges that don’t cancel out.

Alexis Bravo 1D

The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length.

Alexis Bravo 1D

Can hybridization take place without electron promotion?

Alexis Bravo 1D

The lone pair would cause the repulsion because of how close it is to the nucleus of the central atom.

Alexis Bravo 1D

VSEPR is how we predict the geometry of molecules from the number of electron pairs surrounding their central atoms. It helps us get a 3-D picture of what molecules actually look like.

Alexis Bravo 1D

The type of bond doesn’t affect the formula so a double bond would still show up as AX.

Alexis Bravo 1D

lone pairs on non-central atoms affect the bond angle

Alexis Bravo 1D

Yes cations and anions show opposite polarizability trends because cations are smaller than their parent atoms and less polarizable and anions show the opposite trend.

Alexis Bravo 1D

The bigger atoms should have bigger polarizabililty, so the size has a direct relationship with polarizability.

Alexis Bravo 1D

The ability of a cation to distort an anion is the polarization power and the tendency of the anion to become polarized by the cation is polarizability

Alexis Bravo 1D

Yes we have to know what was covered in lecture last week that had to do with chapter 3.

Alexis Bravo 1D

When we draw a line in a covalent bond means the electrons are being shared because the line is how we represent the sharing in a covalent bond.

Alexis Bravo 1D

This isn’t true because even though it is possible for kinetic energy to increase as frequency increases, that’s not always the case depending on what the threshold energy, since kinetic energy only increases after surpassing the threshold energy.

Alexis Bravo 1D

Could you please give an example of how it would work for sig figs with addition/subtraction? Would that mean that adding something like 3.045+7.26 would result in an answer with only two figures after the decimal?

Alexis Bravo 1D

You would use lambda= h/mv but would have to find the mass of the neon atom and plug that value into the equation.

Alexis Bravo 1D

Dr. Lavelle had said that we aren't required to know this according to the 14A syllabus.

Alexis Bravo 1D

How does work function fit into the problem? Is it only necessary in order to show us that this is a moving electron?

Alexis Bravo 1D

Since wavelength=speed of light/ frequency, changing the frequency affects the wavelength.

Alexis Bravo 1D

I think the closest noble gas would probably be best for the shorthand.

Alexis Bravo 1D

Will the mass of an electron be one of the values given to us on the exams?

Alexis Bravo 1D

For the tests I think we will be given any information about conversions that most of us wouldn't know since we are being tested on concepts and applications, not conversions such as those from eV to J.

Alexis Bravo 1D

A lot of times we will use multiple equations to solve one problem so we might use what is given in one equation in order to plug that answer into the other equation.

Alexis Bravo 1D

The homework should be on what you prefer to practice more from every section up until now which includes the quantum world and review of chemical and physical principles.

Alexis Bravo 1D

When the reactants of combustion are given, the products will include H2O and CO2.

Alexis Bravo 1D

All formats mean the same thing but we usually right it as mols in our answers.

Alexis Bravo 1D

Yes, when the units are not specified I think we would always answer the question in SI units.

Alexis Bravo 1D

You would multiply by three in order to get to the closest full number and you would have to multiply the one by three too, giving you 8,8, and 3.

Alexis Bravo 1D

Yes you would just multiply the the N3 by 2 and the OH by 2 in order to be able to continue balancing the equation

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Oxidation

Re: Electron densisty

Re: polar/nonpolar

Re: Double bond

Re: Electron Promotion

Re: Lone pairs

Re: VSEPR confusion

Re: VSEPR

Re: Lone pairs on non-central atoms

Re: Trends of Polarizing Power

Re: Order of Increasing Polarization

Re: polarization power

Re: Test 3

Re: Meaning of chemical bond

Re: Kinetic Energy

Re: diference in sig figs

Re: De Brogiles wavelength

Re: Midterm?

Re: 4b practice midterm

Re: increasing frequency/ light intensity

Re: Using shorthand [Ar] [ENDORSED]

electron mass

Re: 1.39 and 1.23

Re: When to use E=hc/wavelength

Re: Homework? [ENDORSED]

Re: Balancing Chemical Equations and Combustion

Re: Moles mols mol? [ENDORSED]

Re: Length Units

Re: Homework Question

Re: H.5.b [ENDORSED]