Search found 59 matches

by RichardValdez1L
Tue Jun 12, 2018 6:53 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Calculating Ligands
Replies: 1
Views: 83

Calculating Ligands

Is ligand every bond connected to a metal? And if so, if we are asked to give the maximum number of places on the ligand that can bind simultaneously to a single metal center, what is that referring to?
by RichardValdez1L
Mon Jun 11, 2018 10:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Name of Molecule
Replies: 4
Views: 193

Re: Name of Molecule

Like for example I3-, I'm confused whether this is linear or a trigonal bipyramidal
by RichardValdez1L
Mon Jun 11, 2018 10:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Name of Molecule
Replies: 4
Views: 193

Name of Molecule

How do we know when to ignore the lone pair electrons when naming the molecule? Because this can change a trigonal pyramidal to a trigonal planar correct?
by RichardValdez1L
Mon Jun 11, 2018 4:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal bipyramidal and octahedral family [ENDORSED]
Replies: 2
Views: 189

Trigonal bipyramidal and octahedral family [ENDORSED]

Are we going to have to know how to do these type of VSEPR problems for the final?
by RichardValdez1L
Mon Jun 11, 2018 4:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Atom vs lone pair
Replies: 3
Views: 104

Atom vs lone pair

Why does a lone pair of electrons push away bonds more than a typical atom. For example, "120 degrees" vs "less than 120 degrees"
by RichardValdez1L
Sun Jun 10, 2018 8:33 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted vs Lewis Acids and Bases
Replies: 5
Views: 398

Bronsted vs Lewis Acids and Bases

Does Bronsted just tell you whether the atom is a hydrogen donor or accepter while the lewis tells you whether the atom is an electron donor or accepter? Or is there more to it than that?
by RichardValdez1L
Sun Jun 10, 2018 8:29 pm
Forum: Dipole Moments
Topic: Dipole Moment understanding
Replies: 5
Views: 346

Dipole Moment understanding

So just to clarify, a dipole moment is when there is an angle between two atoms that is anything besides 180 degrees right? If not, can someone give me a conceptual understanding of it?
by RichardValdez1L
Sun Jun 10, 2018 8:24 pm
Forum: Dipole Moments
Topic: Non-polar molecules
Replies: 4
Views: 221

Non-polar molecules

If a non-polar molecule must contain zero electric dipole moments, does that mean that dipoles can exist as long as they cancel ? Or do they always have to just not exist? And does just having one dipole moment make it polar?
by RichardValdez1L
Sun Jun 10, 2018 8:21 pm
Forum: Lewis Acids & Bases
Topic: Donating electrons
Replies: 3
Views: 220

Donating electrons

If lewis bases donates electrons and lewis acids accepts electrons does that mean that there is always one base and one acid connected between a bond and the acid is always the one accepting electrons and the bases are always the ones donating?
by RichardValdez1L
Sun Jun 10, 2018 8:15 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: hydrogen atom in acid
Replies: 2
Views: 174

hydrogen atom in acid

Why do acids lose hydrogen atoms more easily?
by RichardValdez1L
Sun Jun 10, 2018 8:14 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: acid plus base
Replies: 2
Views: 173

acid plus base

If we have one acid and one base, do we have to do calculations to determine if the product is one or the other or do we just assume it is neutral?
by RichardValdez1L
Sun Jun 03, 2018 10:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 6
Views: 190

Re: Molecular Shape

both 2 dimensional and 3 dimensional
by RichardValdez1L
Sun Jun 03, 2018 10:54 pm
Forum: Hybridization
Topic: Atomic orbitals vs hybrid orbitals
Replies: 2
Views: 129

Atomic orbitals vs hybrid orbitals

I just want to clarify and have this corrected if wrong, first we do the electron configuration diagram we learned for the midterm, then we fill in the valence electrons, all the pairs are considered an atomic orbital and all the single electrons are considered a hybrid orbital, the amount of hybrid...
by RichardValdez1L
Sun Jun 03, 2018 10:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Confusion about lone pair placement
Replies: 2
Views: 120

Confusion about lone pair placement

So it's to my understanding that the bond pairs have to be placed the furthest from each other, but I'm still confused on where exactly to place the lone pair? I remember hearing something about 90 degrees...
by RichardValdez1L
Sun Jun 03, 2018 10:36 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Atom Distance, repulsion?
Replies: 6
Views: 254

Atom Distance, repulsion?

What's the significance for the bonds to be as far from each other as possible? Like how is repulsion and electrons involved?
by RichardValdez1L
Sun Jun 03, 2018 10:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and Lewis
Replies: 2
Views: 69

VSEPR and Lewis

Furthermore on the relationship of these two, lets take boron triflouride for example, three bonding pairs. When we draw the Lewis structure the bonds around 90 degrees away from each other, but if we draw the VSEPR structure they're closer to 120 degrees. Are we still correct if we choose to draw t...
by RichardValdez1L
Sun Jun 03, 2018 10:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structure and Molecular Shape
Replies: 3
Views: 99

Lewis Structure and Molecular Shape

I am also overall confused on why these two topics focus on VALENCE electrons, is it because valence electrons are the only ones pertaining to bonding?
by RichardValdez1L
Sun Jun 03, 2018 10:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 6
Views: 190

Molecular Shape

So is it like a rule of thumb that every atom should be as far from the other in determining the molecular shape?
by RichardValdez1L
Sun May 27, 2018 11:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarization
Replies: 2
Views: 162

Polarization

To clarify, polarization is where a molecule may have a positive and negative charge with the atoms contained? If so, what is so important about this concept in regards to this class?
by RichardValdez1L
Sun May 27, 2018 11:55 pm
Forum: Bond Lengths & Energies
Topic: Highest Ionization Energy
Replies: 2
Views: 188

Highest Ionization Energy

Another iffy topic on the test for me was ionization energy, if the highest ionization trend points toward the top right, then what if we have an molecule such as BrB and PS2. Are we just supposed to guesstimate or is there a method?
by RichardValdez1L
Sun May 27, 2018 11:51 pm
Forum: Bond Lengths & Energies
Topic: Energies
Replies: 4
Views: 214

Energies

After the test last week, I realized I'm still not understanding energies and bond lengths. I get that as the more bonds are added the greater the strength and the shorter the length, but what if we are comparing two single bonds but one is a C-C and the other is a C-P. How would this differ? And wh...
by RichardValdez1L
Sun May 27, 2018 11:46 pm
Forum: Dipole Moments
Topic: Homework Question 4.29
Replies: 1
Views: 54

Homework Question 4.29

Is the reason 1 and 2 are polar is because the bonds are not opposite each other? Because it's to my understanding that 1 has the largest dipole moment because they bonds are the closest. Also, if anyone can give me a conceptual understanding of what a dipole moment is it would be much appreciated! ...
by RichardValdez1L
Sun May 27, 2018 11:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Meaning
Replies: 5
Views: 297

Formal Charge Meaning

Is the main purpose of a formal charge on an atom to display whether it draws in electrons such as (-) from the atom connected to it in a Lewis Dot Structure?
by RichardValdez1L
Sun May 27, 2018 11:39 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Exponent
Replies: 5
Views: 402

Formal Charge Exponent

So does the formal charge on a molecule such as (SO4)^-2 apply as the overall formal charge to the entire molecule even though it possibly could only be attached to one atom?
by RichardValdez1L
Sun May 20, 2018 11:56 pm
Forum: Electronegativity
Topic: Calculating electronegativity
Replies: 10
Views: 429

Calculating electronegativity

Although we know the trend for electronegativity and "FONCl", are we supposed to have the other element's electronegativities memorized or is there a way to calculate it?
by RichardValdez1L
Sun May 20, 2018 11:51 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic versus Covalent Bonds [ENDORSED]
Replies: 1
Views: 77

Ionic versus Covalent Bonds [ENDORSED]

Can a single Lewis structure contain an ionic and covalent bond?
by RichardValdez1L
Sun May 20, 2018 11:49 pm
Forum: Octet Exceptions
Topic: Octet Rules
Replies: 4
Views: 242

Octet Rules

Is Boron the only atom that has an incomplete octet?
by RichardValdez1L
Sun May 20, 2018 11:45 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 1
Views: 133

Expanded Valence Shells

Why is the expanded valence electron always applied to the central atom? Also do you have to even out the electrons if there are two central atoms or do you have to fill one of the shells completely first?
by RichardValdez1L
Sun May 20, 2018 11:34 pm
Forum: Lewis Structures
Topic: Lewis Dot vs Lewis Structure
Replies: 3
Views: 124

Lewis Dot vs Lewis Structure

Is a Lewis Dot structure strictly only for single elements where as Lewis Structure is for 2 or more?
by RichardValdez1L
Sun May 20, 2018 11:30 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 9
Views: 380

Bond Length

Is one single bond larger than a two double bonds? or three triple bonds? is there any way to calculate this or is this just general knowledge?
by RichardValdez1L
Sat May 12, 2018 3:36 pm
Forum: Ionic & Covalent Bonds
Topic: Why can't hydrogen be a central atom? [ENDORSED]
Replies: 6
Views: 400

Why can't hydrogen be a central atom? [ENDORSED]

I have a hunch its because of its number of electrons but can't quite understand why? Is it because it can't form more than a single bond ?
by RichardValdez1L
Sat May 12, 2018 3:34 pm
Forum: Lewis Structures
Topic: Multiple Central atoms
Replies: 1
Views: 135

Multiple Central atoms

Is it possible to have 3-4 central atoms if the element has the lowest ionization energy of all?
by RichardValdez1L
Sat May 12, 2018 3:29 pm
Forum: Ionic & Covalent Bonds
Topic: Nonpolar covalent bonds
Replies: 2
Views: 114

Nonpolar covalent bonds

What are nonpolar covalent bonds and how are they significant in solving a lewis structure?
by RichardValdez1L
Sat May 12, 2018 1:26 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis Structure vs Resonance Structure
Replies: 6
Views: 166

Lewis Structure vs Resonance Structure

What is the conceptual difference between a Lewis Structure and a Resonance Structure?
by RichardValdez1L
Sat May 12, 2018 1:22 pm
Forum: Ionic & Covalent Bonds
Topic: "1.20A or 1.40A"
Replies: 2
Views: 86

"1.20A or 1.40A"

When these numbers are linked towards a bond, it represents the bond length ? And if so, why is it necessary to know the bond length?
Also can we solve for this?
by RichardValdez1L
Sat May 12, 2018 1:19 pm
Forum: Ionic & Covalent Bonds
Topic: Lowest Ionization Trend
Replies: 2
Views: 137

Re: Lowest Ionization Trend

Oh nevermind I figured it out!
by RichardValdez1L
Sat May 12, 2018 1:17 pm
Forum: Ionic & Covalent Bonds
Topic: Lowest Ionization Trend
Replies: 2
Views: 137

Lowest Ionization Trend

I may be wrong, but the trend towards the lowest ionization energy goes from from left to right and from bottom to top ? Or does it just go horizontally to the right?
by RichardValdez1L
Sat May 12, 2018 1:14 pm
Forum: Ionic & Covalent Bonds
Topic: Metals
Replies: 4
Views: 125

Metals

Do the metals such as lithium, beryllium, sodium and manganese try to gain electrons or lose electrons, since it's technically closer to the noble gases before it?
by RichardValdez1L
Mon Apr 30, 2018 12:00 am
Forum: Einstein Equation
Topic: Difference between diffraction patterns and interacting waves
Replies: 2
Views: 137

Difference between diffraction patterns and interacting waves

Can someone please explain the difference between these two?
by RichardValdez1L
Sun Apr 29, 2018 11:58 pm
Forum: Properties of Electrons
Topic: Is this movement noticeable?
Replies: 4
Views: 218

Is this movement noticeable?

Is only movements from extremely small sized mass noticeable? Like NEVER cars or balls?
by RichardValdez1L
Sun Apr 29, 2018 11:52 pm
Forum: Einstein Equation
Topic: Kinetic Energy vs Power
Replies: 2
Views: 113

Kinetic Energy vs Power

Can 1/2mv^2 and mv be used for the same problem if we're only given kinetic energy or power? Like If we are given power, can we solve for kinetic energy?
by RichardValdez1L
Sun Apr 29, 2018 11:48 pm
Forum: Einstein Equation
Topic: p=mv [ENDORSED]
Replies: 3
Views: 318

p=mv [ENDORSED]

Is the work function interhchangeable with power?
by RichardValdez1L
Thu Apr 26, 2018 1:06 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Constant [ENDORSED]
Replies: 6
Views: 230

Rydberg Constant [ENDORSED]

For the Rydberg Constant are we supposed to be using 3.29 x 10^15 Hz, or 1.09 x 10^7 m^-1. An explanation would be much appreciated!
by RichardValdez1L
Wed Apr 25, 2018 4:44 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect post-quiz 17-19 [ENDORSED]
Replies: 6
Views: 3470

Re: Photoelectric effect post-quiz 17-19 [ENDORSED]

What is an incident line and why for the second part of c. we use the E=hv equation?
by RichardValdez1L
Sun Apr 22, 2018 2:01 pm
Forum: Einstein Equation
Topic: Looking over discussion problems
Replies: 2
Views: 111

Looking over discussion problems

I have trouble putting together the pieces to comprehending these statements, can someone clarify how they would go about solving this equation? Increasing the brightness of incoming light increases the number of ejected electrons. Increasing the frequency of incoming light can increase the number o...
by RichardValdez1L
Sun Apr 22, 2018 1:56 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf [ENDORSED]
Replies: 4
Views: 1206

E=hv vs E=hf [ENDORSED]

I've seen E=hf around and I just wanted to confirm they're the same, and if they're not can someone explain the difference?
by RichardValdez1L
Sun Apr 22, 2018 1:47 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Different element in Rydberg
Replies: 4
Views: 139

Different element in Rydberg

If we were asked to solve for the wavelength of light emitted from electrons from lets say a carbon atom, how would we approach the problem since it's no longer a hydrogen atom?
by RichardValdez1L
Sun Apr 22, 2018 1:44 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Formula
Replies: 4
Views: 151

Rydberg Formula

Since the Rydberg formula can solve for either 1/lambda or the delta E (change in energy), does that mean that they are interchangeable in this sense ?
by RichardValdez1L
Sun Apr 22, 2018 1:38 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum [ENDORSED]
Replies: 7
Views: 228

Electromagnetic Spectrum [ENDORSED]

Are we expected to know the electromagnetic spectrum come test time ? like where one series starts and another ends ?
by RichardValdez1L
Wed Apr 18, 2018 10:49 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wave and Particle Properties of Electrons and Photons
Replies: 1
Views: 50

Wave and Particle Properties of Electrons and Photons

Are we just supposed to understand that electrons and photons act sometimes as waves and sometimes as particles because when using two beams the particles do not collide and the interference patterns for waves? Any clarification would be much appreciated ! :)
by RichardValdez1L
Wed Apr 18, 2018 10:48 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wave and Particle Properties of Electrons and Photons
Replies: 4
Views: 96

Wave and Particle Properties of Electrons and Photons

Are we just supposed to understand that electrons and photons act sometimes as waves and sometimes as particles because when using two beams the particles do not collide and the interference patterns for waves? Any clarification would be much appreciated ! :)
by RichardValdez1L
Sat Apr 14, 2018 5:18 pm
Forum: Properties of Light
Topic: Units for wavelengths [ENDORSED]
Replies: 6
Views: 221

Units for wavelengths [ENDORSED]

Do our units for wavelengths have to be meters or are they supposed to align with the units given in the problem?
by RichardValdez1L
Sat Apr 14, 2018 5:07 pm
Forum: Balancing Chemical Reactions
Topic: Chemistry Background [ENDORSED]
Replies: 4
Views: 273

Chemistry Background [ENDORSED]

Does anyone know if our review of chemical and physical principles of chemistry will be needed going forward in the class? And if so, will it be significant?
by RichardValdez1L
Sat Apr 14, 2018 5:03 pm
Forum: Balancing Chemical Reactions
Topic: Whole numbers
Replies: 7
Views: 327

Whole numbers

Must all subscripts be whole numbers ? and if so if we get one that is like 33/2, would just multiplying all other ones and simplifying get us our answer?
by RichardValdez1L
Sat Apr 14, 2018 4:59 pm
Forum: Empirical & Molecular Formulas
Topic: Compound Order
Replies: 5
Views: 221

Compound Order

If given the elements carbon nitrogen hydrogen and oxygen, how are we supposed to organize (such as CHON or HCNO) them into an empirical/molecular and why?
by RichardValdez1L
Sat Apr 14, 2018 4:55 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical and Molecular Formulas [ENDORSED]
Replies: 4
Views: 179

Empirical and Molecular Formulas [ENDORSED]

Similar to the end of the test from last week, to determine the molecular formula we count all of the elements and for the empirical formula we ALWAYS simplify when possible ?
by RichardValdez1L
Sat Apr 14, 2018 4:52 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer Series
Replies: 2
Views: 48

Balmer Series

So to clarify the Balmer series consists of all the visible colors we can see such as green, blue, and red?
by RichardValdez1L
Fri Apr 06, 2018 2:12 pm
Forum: Significant Figures
Topic: Sig Figs [ENDORSED]
Replies: 9
Views: 435

Re: Sig Figs [ENDORSED]

My TA said always use three sig figs for tests but said she doesn't dock points for it on homework.

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