Search found 30 matches

by Alexis Bravo 1D
Sun Jun 10, 2018 11:18 pm
Forum: Naming
Topic: Oxidation
Replies: 3
Views: 178

Re: Oxidation

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...
by Alexis Bravo 1D
Sun Jun 10, 2018 7:44 pm
Forum: Hybridization
Topic: Electron densisty
Replies: 5
Views: 211

Re: Electron densisty

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.
by Alexis Bravo 1D
Sun Jun 10, 2018 7:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar/nonpolar
Replies: 3
Views: 99

Re: polar/nonpolar

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.
by Alexis Bravo 1D
Sun Jun 03, 2018 10:11 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Double bond
Replies: 5
Views: 222

Re: Double bond

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.
by Alexis Bravo 1D
Sun Jun 03, 2018 10:08 pm
Forum: Hybridization
Topic: Electron Promotion
Replies: 2
Views: 102

Re: Electron Promotion

Can hybridization take place without electron promotion?
by Alexis Bravo 1D
Sun Jun 03, 2018 9:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 7
Views: 149

Re: Lone pairs

The lone pair would cause the repulsion because of how close it is to the nucleus of the central atom.
by Alexis Bravo 1D
Sun May 27, 2018 11:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR confusion
Replies: 8
Views: 185

Re: VSEPR confusion

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.
by Alexis Bravo 1D
Sun May 27, 2018 10:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 3
Views: 83

Re: VSEPR

The type of bond doesn’t affect the formula so a double bond would still show up as AX.
by Alexis Bravo 1D
Sun May 27, 2018 9:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs on non-central atoms
Replies: 4
Views: 59

Re: Lone pairs on non-central atoms

lone pairs on non-central atoms affect the bond angle
by Alexis Bravo 1D
Sun May 20, 2018 11:49 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Trends of Polarizing Power
Replies: 4
Views: 2423

Re: Trends of Polarizing Power

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.
by Alexis Bravo 1D
Sun May 20, 2018 9:08 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Order of Increasing Polarization
Replies: 2
Views: 149

Re: Order of Increasing Polarization

The bigger atoms should have bigger polarizabililty, so the size has a direct relationship with polarizability.
by Alexis Bravo 1D
Sun May 20, 2018 8:49 pm
Forum: Dipole Moments
Topic: polarization power
Replies: 3
Views: 100

Re: polarization power

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
by Alexis Bravo 1D
Sun May 20, 2018 8:43 pm
Forum: Bond Lengths & Energies
Topic: Test 3
Replies: 8
Views: 169

Re: Test 3

Yes we have to know what was covered in lecture last week that had to do with chapter 3.
by Alexis Bravo 1D
Sun May 13, 2018 10:38 pm
Forum: Lewis Structures
Topic: Meaning of chemical bond
Replies: 5
Views: 79

Re: Meaning of chemical bond

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.
by Alexis Bravo 1D
Sun May 13, 2018 10:31 pm
Forum: Photoelectric Effect
Topic: Kinetic Energy
Replies: 2
Views: 140

Re: Kinetic Energy

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.
by Alexis Bravo 1D
Sun May 13, 2018 10:21 pm
Forum: Significant Figures
Topic: diference in sig figs
Replies: 5
Views: 173

Re: diference in sig figs

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?
by Alexis Bravo 1D
Sun May 06, 2018 11:16 pm
Forum: DeBroglie Equation
Topic: De Brogiles wavelength
Replies: 4
Views: 154

Re: De Brogiles wavelength

You would use lambda= h/mv but would have to find the mass of the neon atom and plug that value into the equation.
by Alexis Bravo 1D
Sun May 06, 2018 10:52 pm
Forum: *Black Body Radiation
Topic: Midterm?
Replies: 3
Views: 307

Re: Midterm?

Dr. Lavelle had said that we aren't required to know this according to the 14A syllabus.
by Alexis Bravo 1D
Sun May 06, 2018 10:32 pm
Forum: Properties of Light
Topic: 4b practice midterm
Replies: 9
Views: 384

Re: 4b practice midterm

How does work function fit into the problem? Is it only necessary in order to show us that this is a moving electron?
by Alexis Bravo 1D
Sun Apr 29, 2018 11:38 pm
Forum: Photoelectric Effect
Topic: increasing frequency/ light intensity
Replies: 5
Views: 229

Re: increasing frequency/ light intensity

Since wavelength=speed of light/ frequency, changing the frequency affects the wavelength.
by Alexis Bravo 1D
Sun Apr 29, 2018 11:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Using shorthand [Ar] [ENDORSED]
Replies: 5
Views: 89

Re: Using shorthand [Ar] [ENDORSED]

I think the closest noble gas would probably be best for the shorthand.
by Alexis Bravo 1D
Tue Apr 24, 2018 7:36 pm
Forum: Properties of Electrons
Topic: electron mass
Replies: 1
Views: 101

electron mass

Will the mass of an electron be one of the values given to us on the exams?
by Alexis Bravo 1D
Sun Apr 22, 2018 11:09 pm
Forum: DeBroglie Equation
Topic: 1.39 and 1.23
Replies: 3
Views: 104

Re: 1.39 and 1.23

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.
by Alexis Bravo 1D
Sun Apr 22, 2018 10:58 pm
Forum: Einstein Equation
Topic: When to use E=hc/wavelength
Replies: 6
Views: 240

Re: When to use E=hc/wavelength

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.
by Alexis Bravo 1D
Sun Apr 15, 2018 11:52 pm
Forum: Properties of Light
Topic: Homework? [ENDORSED]
Replies: 10
Views: 294

Re: Homework? [ENDORSED]

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.
by Alexis Bravo 1D
Sun Apr 15, 2018 11:47 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations and Combustion
Replies: 7
Views: 247

Re: Balancing Chemical Equations and Combustion

When the reactants of combustion are given, the products will include H2O and CO2.
by Alexis Bravo 1D
Sun Apr 15, 2018 11:44 pm
Forum: SI Units, Unit Conversions
Topic: Moles mols mol? [ENDORSED]
Replies: 18
Views: 565

Re: Moles mols mol? [ENDORSED]

All formats mean the same thing but we usually right it as mols in our answers.
by Alexis Bravo 1D
Wed Apr 11, 2018 11:13 am
Forum: SI Units, Unit Conversions
Topic: Length Units
Replies: 15
Views: 417

Re: Length Units

Yes, when the units are not specified I think we would always answer the question in SI units.
by Alexis Bravo 1D
Fri Apr 06, 2018 12:05 pm
Forum: Empirical & Molecular Formulas
Topic: Homework Question
Replies: 4
Views: 154

Re: Homework Question

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.
by Alexis Bravo 1D
Fri Apr 06, 2018 12:02 pm
Forum: Balancing Chemical Reactions
Topic: H.5.b [ENDORSED]
Replies: 7
Views: 194

Re: H.5.b [ENDORSED]

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

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