Search found 24 matches

by Jared Pagal 1J
Wed Jun 13, 2018 10:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

Remember, all CATions are PAWsitive! XD
by Jared Pagal 1J
Wed Jun 13, 2018 10:47 pm
Forum: Empirical & Molecular Formulas
Topic: Midterm Q3
Replies: 3
Views: 232

Re: Midterm Q3

This problem is a combustion problem so we know that one of the reactants is O2, and given the products of CO2, H2O, and N, we know that the oxygen in the products comes from O2. This would mean that C,H, and N make up nicotine. Also I believe during that midterm he told us it was CHN
by Jared Pagal 1J
Wed Jun 13, 2018 10:37 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number
Replies: 5
Views: 311

Re: Oxidation Number

yazminedesan1F wrote:How do you find the oxidation number of a metal?

Metal ion + (number of ligands bound * charge of ligand) = overall charge of coordination compound. Hope this helps!
by Jared Pagal 1J
Wed Jun 13, 2018 10:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPER Theory and Bond types
Replies: 3
Views: 221

Re: VESPER Theory and Bond types

The first bond in a double bond is a sigma and the second is a pi, which one is which is arbitrary. In a triple bond, there would be one sigma bond and two pi bonds.
by Jared Pagal 1J
Wed Jun 13, 2018 10:20 pm
Forum: Lewis Structures
Topic: Coulomb's law
Replies: 1
Views: 142

Re: Coulomb's law

I think that for the final, we should be familiar with coloumb's law but I feel that a question solely on coulomb's law would be unlikely.
by Jared Pagal 1J
Wed Jun 13, 2018 9:46 pm
Forum: Molarity, Solutions, Dilutions
Topic: Test 1, question 1 part B
Replies: 1
Views: 184

Re: Test 1, question 1 part B

In order to find the concentrations of Na ions in the final solutions, you must first find the concentration of the Na ions in the first solution. Using the Molecular formula of (Na2CO3), you know that the 0.0377 concentration of sodium bicarbonate must be doubled since there are two Na for every on...
by Jared Pagal 1J
Wed Jun 13, 2018 9:31 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligands?
Replies: 3
Views: 305

Re: ligands?

I don't think we will be required to memorize ligands, so just know that a ligand is any atom or molecule that binds to another atoms.
by Jared Pagal 1J
Wed Jun 13, 2018 9:29 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 10
Views: 288

Re: lewis structure

in drawing a lewis structure, typically the least electronegative atom is the central atom
by Jared Pagal 1J
Mon Jun 11, 2018 11:25 pm
Forum: Hybridization
Topic: How to figure out hybridization
Replies: 5
Views: 668

Re: How to figure out hybridization

Does a lone pair count as one region of electron density? or do you count both electrons each as a region of density?
by Jared Pagal 1J
Sun Jun 03, 2018 11:39 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 7
Views: 287

Re: Polarizability

the size of the electron cloud is determined by the energy of the atom's electrons, I believe. A few factors influence polarizability. The greater the amount of electrons, the less control the nuclear charge has on charge distribution, thus the increased polarizability of the atom. Additionally, th...
by Jared Pagal 1J
Sun Jun 03, 2018 11:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Significance of Coordination Number?
Replies: 7
Views: 260

Re: Significance of Coordination Number?

Amir Akhavan 1E wrote:I think it is important in naming the molecule and knowing its geometric shape. It could also be a question he may ask on the exam.

How would this be tested on the exam? Would it apply to the naming of the shape or the compound itself?
by Jared Pagal 1J
Sun Jun 03, 2018 11:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 6
Views: 189

Re: Molecular Shape

Miya Lopez 1L wrote:But if you have more lone pairs, they would push the other bonds/molecules even further away from them correct? Thank you:)

Yes, additionally, I believe that the force that a lone pair exerts on bonds would be greater than the force a bond has on another bond.
by Jared Pagal 1J
Fri May 25, 2018 11:08 am
Forum: Octet Exceptions
Topic: 3.61
Replies: 4
Views: 385

Re: 3.61

There is a general rule when constructing lewis structures: any left over electrons usually are put on the central atom. Additionally, notice that Iodine has an expanded octet and can therefore accept those lone pairs.
by Jared Pagal 1J
Sun May 20, 2018 8:32 pm
Forum: Lewis Structures
Topic: Different ways to write the lewis structure?
Replies: 6
Views: 241

Re: Different ways to write the lewis structure?

I believe that these two structures are essentially the same things because, as you said, they have equal numbers of bonds and electrons. Also, remember that resonance structures show the possible combinations of where electrons may be in the electron “cloud” so in actuality the electrons move aroun...
by Jared Pagal 1J
Sat May 19, 2018 11:42 am
Forum: Ionic & Covalent Bonds
Topic: radicals [ENDORSED]
Replies: 9
Views: 285

Re: radicals [ENDORSED]

does an atom have to give up or take an electron in order for it to be a radical? or if the valence shell has an odd number of electrons is it already considered a radical?
by Jared Pagal 1J
Sat May 19, 2018 11:37 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Dipole-Induced Dipole Interactions in Solution [ENDORSED]
Replies: 1
Views: 247

Dipole-Induced Dipole Interactions in Solution [ENDORSED]

Do dipole-induced dipole interactions still occur in aqueous solution? For the example given in lecture on friday, Prof. Lavelle said that HCl would induce a dipole force in N2. Would this still be the case if HCl disassociated into H+ and Cl- in solution?
by Jared Pagal 1J
Sun May 13, 2018 4:59 pm
Forum: Resonance Structures
Topic: Bonds or Lone Pairs more important?
Replies: 7
Views: 443

Bonds or Lone Pairs more important?

When constructing a resonance structure, is it more common to add double bonds between atoms or lone pairs to the central atom to balance out the number of valence electrons?
by Jared Pagal 1J
Sun May 13, 2018 4:41 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 2
Views: 104

Re: Expanded Octet

I don't think that they will always have more than 8 electrons because it depends on the total count of the valence electrons in the molecule. For example, when sodium and chlorine form NaCl, Cl does not have more than 8 electrons in its valence shell. The expanded octet rule does not mean that they...
by Jared Pagal 1J
Sun May 13, 2018 4:36 pm
Forum: Lewis Structures
Topic: monatomic ion
Replies: 2
Views: 85

Re: monatomic ion

In context of this question, the monoatomic ion in part a would be both magnesium and arsenic. What the question refers to what it says "expected charges" is to balance the molecular formula so that the charges balance out between each monoatomic ion.
by Jared Pagal 1J
Sun May 06, 2018 11:03 pm
Forum: Sigma & Pi Bonds
Topic: Hybrid orbitals
Replies: 4
Views: 274

Re: Hybrid orbitals

Basically, orbitals hybridize because hybridization allows for the molecule to be in its lowest possible energy state (or most stable state). The shape of hybridized orbitals depends on how many electrons are present how much energy they have
by Jared Pagal 1J
Wed May 02, 2018 7:49 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration of Scandium
Replies: 1
Views: 131

Electron Configuration of Scandium

So in lecture on Wednesday, Prof. Lavelle used Scandium as an example to write out the electron configuration. His answer was Sc: [Ar]3d^1 4s^2. However, when I use the Aufbau principle, I get Sc: [Ar]4s^2 3d^1

Is the 3d orbital always going to be a higher energy level than 4s?
by Jared Pagal 1J
Sun Apr 22, 2018 7:21 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 12
Views: 378

Re: Photoelectric Effect

Yes, in order for a photon to be emitted, the energy of the incoming photon must be equal to or greater than the threshold energy (the minimum energy it takes to eject one electron). Any "excess" energy is considered the kinetic energy of the ejected electron.
by Jared Pagal 1J
Sun Apr 22, 2018 7:15 pm
Forum: Properties of Light
Topic: still don't uderrsatnd what a photon is [ENDORSED]
Replies: 20
Views: 411

Re: still don't uderrsatnd what a photon is [ENDORSED]

Would it be wrong to say that a photon is the smallest quantum of light, like how one water molecule is the smallest quantum of water?
by Jared Pagal 1J
Thu Apr 19, 2018 8:09 pm
Forum: Photoelectric Effect
Topic: 1.9
Replies: 6
Views: 180

Re: 1.9

The second value in the table is given as Energy equals 3.3x10^-19 J. I divided by Planck's constant using the equation E=hv and the result was 4.980x10^14. Is it unusual to have a wavelength that long?

Go to advanced search