Search found 36 matches

by Liliana Rosales 1E
Sun Jun 10, 2018 10:52 pm
Forum: Hybridization
Topic: Chapter 4 [ENDORSED]
Replies: 4
Views: 268

Re: Chapter 4 [ENDORSED]

If the dipoles of a vsper model cancel out then the molecule would be non-polar. However if the dipoles don't cancel out then the molecule is polar. You can figure out the dipoles by looking at the electronegativity of each element.
by Liliana Rosales 1E
Sun Jun 10, 2018 10:48 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 365

Re: Sig Figs for Final

I think it will matter because I know sig figs were emphasized for the midterm. So just to make sure and avoid getting points off, it will be best to use sig figs for the final.
by Liliana Rosales 1E
Sun Jun 10, 2018 10:45 pm
Forum: Amphoteric Compounds
Topic: Amphoteric and amphiprotic
Replies: 6
Views: 506

Re: Amphoteric and amphiprotic

Also, just to add on copper, zinc, tin, lead, aluminium, and beryllium tend to be amphoteric as well.
by Liliana Rosales 1E
Sun Jun 10, 2018 9:21 pm
Forum: Properties of Electrons
Topic: Wave-like Properties of Electron
Replies: 5
Views: 207

Re: Wave-like Properties of Electron

Yes, it is typically is 1x10^-18 :)
by Liliana Rosales 1E
Sun Jun 03, 2018 8:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: hw 4.21 a
Replies: 2
Views: 105

Re: hw 4.21 a

It is trigonal planar because each carbon has three electron densities attached to it.
by Liliana Rosales 1E
Sun Jun 03, 2018 8:34 pm
Forum: Dipole Moments
Topic: Dipole Moment Vectors
Replies: 2
Views: 154

Re: Dipole Moment Vectors

I don't think it is necessarily the sum of the dipoles. As long as you can distinguish if the dipoles will cancel out, then you know is non-polar. If the dipoles don't cancel, then the molecule would be polar.
by Liliana Rosales 1E
Sun Jun 03, 2018 8:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Benzene structure
Replies: 2
Views: 113

Benzene structure

Hi,
Does anyone know if we are expected to know how to draw structures like the one of Benzene?
by Liliana Rosales 1E
Sat Jun 02, 2018 11:50 am
Forum: Biological Examples
Topic: Chemotherapy Example
Replies: 2
Views: 251

Re: Chemotherapy Example

If I remember correctly, cis-diamine-dichloro-platinum(II) has a lone pair on nitrogen that is able to bond with DNA which stops cell division. On the other hand, the other structure trans-diammine-dichloro-platinum(II), doesn't have this ability to bond with DNA. This is why cis-diamine-dichloro-pl...
by Liliana Rosales 1E
Sun May 27, 2018 11:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: E
Replies: 3
Views: 125

Re: E

It would be E subscript 3.
by Liliana Rosales 1E
Sun May 27, 2018 11:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angle
Replies: 9
Views: 243

Re: Bond angle

Lone pairs create a greater electron repulsion. Therefore, they tend to reduce the bond angles.
by Liliana Rosales 1E
Fri May 25, 2018 5:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 6
Views: 209

Re: Bond Angle

If you know the shape of the molecule, then you can know the bond angles. For example, tetrahedral molecules, have bond angles of 109.5°. Just know the bond angles for each of the shapes Lavelle went over in lecture.(Linear, trigonal planar, tetrahedral,octahedral and so forth)
by Liliana Rosales 1E
Sun May 20, 2018 9:56 pm
Forum: Lewis Structures
Topic: Expanded octets
Replies: 2
Views: 82

Re: Expanded octets

Because elements in the 3rd row and below are part of the d orbital, they are able to have an expanded octet. If the element is found in the third row, then it can have up to 10 extra electrons because the d orbital can hold ten electrons.
by Liliana Rosales 1E
Sun May 20, 2018 9:49 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 1
Views: 169

Polarizability

Is there any connection between dipoles and polarizability of an ion?
by Liliana Rosales 1E
Sun May 20, 2018 9:45 pm
Forum: Resonance Structures
Topic: Stability
Replies: 3
Views: 121

Re: Stability

As long as the formal charge of the structure is closest to zero, I believe any resonance structure would be equally stable.
by Liliana Rosales 1E
Sun May 13, 2018 9:48 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Calculating energy change (Delta E)
Replies: 4
Views: 245

Re: Calculating energy change (Delta E)

The energy would always be negative because the equation involves a negative sign. However I am not too sure if we can assume that energy is negative.
by Liliana Rosales 1E
Sun May 13, 2018 9:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: cations vs anions
Replies: 4
Views: 196

Re: cations vs anions

Cations tend to be smaller in size because they have more protons which means that the electrons are held tightly and closer to the protons. However in anions, there are more electrons which means more electron repulsion. Because of the electron repulsion, electrons tend to spread farther apart and ...
by Liliana Rosales 1E
Sun May 13, 2018 9:23 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 13
Views: 630

Re: Radicals

Basically a Lewis structure with one lone pair would be considered a radical. They tend to be really reactive because electrons like to form bonds instead of being a lone pair. You would say your compound is radical when your Lewis structure ended up having one lone electron.
by Liliana Rosales 1E
Sun May 13, 2018 4:57 pm
Forum: Properties of Light
Topic: Test 2 Question 4
Replies: 8
Views: 281

Re: Test 2 Question 4

Sara Veerman-1H wrote:Lilianna, I believe the answer to this problem is 2.84x10^-19 J

Thank you Sara!
by Liliana Rosales 1E
Sun May 13, 2018 4:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spherical polar coordinates
Replies: 2
Views: 141

Re: Spherical polar coordinates

I would say no just because it wasn't mentioned during lecture. The book tends to have extra information that isn't necessary for the this class in particular. However, it nice to have context and understand what they are.
by Liliana Rosales 1E
Sun May 06, 2018 11:13 pm
Forum: Properties of Light
Topic: Test 2 Question 4
Replies: 8
Views: 281

Re: Test 2 Question 4

Alesha, I just want to confirm, what was the answer for this problem?
by Liliana Rosales 1E
Sun May 06, 2018 10:57 pm
Forum: Trends in The Periodic Table
Topic: Unicorn practice test 6d.
Replies: 3
Views: 164

Re: Unicorn practice test 6d.

I would say that oxygen would be more inclined to lose an electron than nitrogen because is O is closer to the gases compared to nitrogen. The closer an element is to the gases, the more it wants an electron to complete an octet.
by Liliana Rosales 1E
Sat May 05, 2018 11:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configuartions
Replies: 5
Views: 213

Re: Exceptions for Electron Configuartions

Chromium and copper are exceptions because they are most stable when their d sub-levels are half or completely full rather than partially full.
by Liliana Rosales 1E
Sun Apr 29, 2018 12:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: understanding orbitals [ENDORSED]
Replies: 8
Views: 230

Re: understanding orbitals [ENDORSED]

Orbitals show the regions with the highest probability of finding electrons. I don't necessarily think orbitals show an electron's pathway because to my understanding, electrons aren't fixed to a certain position.
by Liliana Rosales 1E
Sun Apr 29, 2018 12:27 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: The concept of Orbitals
Replies: 12
Views: 306

Re: The concept of Orbitals

To my understanding, orbitals are plots derived from a mathematical equation that show the probability of where electrons can be found. However, I'm not too sure about orbitals being electron energy levels and the significance of nodal planes.
by Liliana Rosales 1E
Sat Apr 28, 2018 11:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: The N in l,n,m [ENDORSED]
Replies: 2
Views: 96

Re: The N in l,n,m [ENDORSED]

The principal quantum number (n) would tell you the size of the orbital. The higher the n value, the bigger the orbital is. Also the n value can indirectly tell you the energy of the orbital. For example, an electron at n=1 would need energy to be absorbed in order to excite the electron onto a high...
by Liliana Rosales 1E
Sat Apr 28, 2018 8:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Spin [ENDORSED]
Replies: 4
Views: 143

Re: Electron Spin [ENDORSED]

Basically in the Stern and Gerlach experiment a beam of silver atoms was shot through a magnetic field and this single beam was divided (halved) into two beams after it passed through the magnetic field, this is why it +1/2 and -1/2. As it has been mentioned before, this also tells if an electron is...
by Liliana Rosales 1E
Sun Apr 22, 2018 9:00 pm
Forum: Photoelectric Effect
Topic: Work function [ENDORSED]
Replies: 6
Views: 345

Re: Work function [ENDORSED]

Just to clarify, the work function would be the minimum energy required to take off an electron from the surface of a metal right?
by Liliana Rosales 1E
Sun Apr 22, 2018 8:54 pm
Forum: *Shrodinger Equation
Topic: ch.2.1
Replies: 5
Views: 251

Re: ch.2.1

Chem_Mod wrote:It can escape, but you need to supply a sufficiently large enough energy to overcome the barrier (wall of a box)

I had the same confusion, this was helpful. Thank you.
by Liliana Rosales 1E
Sun Apr 22, 2018 8:51 pm
Forum: *Shrodinger Equation
Topic: Schrodinger Equation
Replies: 2
Views: 176

Re: Schrodinger Equation

Z is just a symbol that stands for the atomic number or the number of protons of an element.
by Liliana Rosales 1E
Sun Apr 15, 2018 5:26 pm
Forum: Balancing Chemical Reactions
Topic: Chemistry Background [ENDORSED]
Replies: 4
Views: 272

Re: Chemistry Background [ENDORSED]

I agree, it is essential to review those principles because they do lay the foundation for the rest of chemistry. If this foundation isn't solid, then the rest of chemistry will be challenging.
by Liliana Rosales 1E
Sat Apr 14, 2018 3:20 pm
Forum: Properties of Light
Topic: Light frequency and photons [ENDORSED]
Replies: 2
Views: 60

Re: Light frequency and photons [ENDORSED]

Thank you. This makes more sense now.
by Liliana Rosales 1E
Fri Apr 13, 2018 11:23 pm
Forum: Properties of Light
Topic: Light frequency and photons [ENDORSED]
Replies: 2
Views: 60

Light frequency and photons [ENDORSED]

Would someone be able to explain how light frequency relates to photons or if there is any relationship between these two concepts?
by Liliana Rosales 1E
Fri Apr 13, 2018 11:18 pm
Forum: Properties of Light
Topic: avogadro's number
Replies: 5
Views: 198

Re: avogadro's number

Dr. Lavelle was saying that we would have to divide the energy by the avogadro's number because the energy is usually given per mole. For problems dealing with the photoelectric effect, you would want to find the energy per photon not per mole. I hope this somewhat clarifies your question.
by Liliana Rosales 1E
Fri Apr 13, 2018 11:10 pm
Forum: *Black Body Radiation
Topic: Black Body? [ENDORSED]
Replies: 13
Views: 1205

Re: Black Body? [ENDORSED]

I believe black bodies absorb the entire electromagnetic spectrum not just the visible spectrum.
by Liliana Rosales 1E
Fri Apr 13, 2018 10:59 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review worksheet week 1: question 9 [ENDORSED]
Replies: 4
Views: 234

Re: Review worksheet week 1: question 9 [ENDORSED]

Thank you for sharing, your method sounds easier and quicker compared to mine.
by Liliana Rosales 1E
Thu Apr 12, 2018 10:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review worksheet week 1: question 9 [ENDORSED]
Replies: 4
Views: 234

Re: Review worksheet week 1: question 9 [ENDORSED]

You would start by converting 25.13g of Fe2O3 into moles, which is done by dividing the grams given by the molar mass of the Fe2O3. Then you would look at the chemical equation given and see how many moles of Fe2O3 there is for every mole of CO. In this case, for one mole of Fe2O3, there is 3 moles ...

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