Search found 36 matches

by Jonathan Marcial Dis 1K
Wed Jun 13, 2018 6:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 1
Views: 133

Orbitals

This still confuses me. Can someone help explain on how to determine the orbitals. Thanks!
by Jonathan Marcial Dis 1K
Sat Jun 09, 2018 1:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand shape
Replies: 2
Views: 117

Re: Ligand shape

I’m actually a little confused on these ligands myself. If someone could possibly help better explain it that would be great!
by Jonathan Marcial Dis 1K
Sat Jun 09, 2018 1:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Palladium
Replies: 1
Views: 131

Re: Palladium

This is because full d orbitals are much more stable than partially filled d orbitals. At such a high energy level electrons can jump from one orbital to another easily.
by Jonathan Marcial Dis 1K
Sat Jun 09, 2018 1:24 pm
Forum: Hybridization
Topic: Bond types
Replies: 4
Views: 249

Re: Bond types

Hydrogen bonds Polar covalent bonds Non polar covalent bonds Ionic bonds Hydrogen: it’s when an oxygen, nitrogen, or fluorine atom with a lone pair interacts with the hydrogen bonded to another nitrogen, oxygen, or fluorine atom. Polar covalent: a covalent bond where a pair of electrons are not equa...
by Jonathan Marcial Dis 1K
Sat Jun 09, 2018 1:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Award picture
Replies: 1
Views: 119

Award picture

Once again congratulations on being great! Be the worlds best female chemist and rep UCLA Alex!
by Jonathan Marcial Dis 1K
Mon Jun 04, 2018 11:42 am
Forum: Lewis Structures
Topic: Test Q.8 [ENDORSED]
Replies: 7
Views: 313

Re: Test Q.8 [ENDORSED]

Thanks everybody! that helps so much
by Jonathan Marcial Dis 1K
Mon Jun 04, 2018 11:40 am
Forum: Bond Lengths & Energies
Topic: Ionic Character
Replies: 3
Views: 805

Ionic Character

I'd really appreciated it if someone could tell me how to determine ionic character.
For example,

which coumpound has greater ionic character...

NaBr or NaI

Thank you in advance.
by Jonathan Marcial Dis 1K
Sun Jun 03, 2018 12:16 pm
Forum: Lewis Structures
Topic: Test Q.8 [ENDORSED]
Replies: 7
Views: 313

Test Q.8 [ENDORSED]

Can someone please explain to me why the Lewis structure that is circled has the shorter boxed bond vs the one that is x ed out. Thank you!
by Jonathan Marcial Dis 1K
Thu May 24, 2018 10:11 pm
Forum: Ionic & Covalent Bonds
Topic: Ion Centers
Replies: 2
Views: 100

Re: Ion Centers

Okay thank you Dr. Lavelle. Much appreciated.
by Jonathan Marcial Dis 1K
Thu May 24, 2018 7:42 pm
Forum: Ionic & Covalent Bonds
Topic: Ion Centers
Replies: 2
Views: 100

Ion Centers

How do you find the distance between the center of ions?
by Jonathan Marcial Dis 1K
Thu May 24, 2018 7:13 pm
Forum: Ionic & Covalent Bonds
Topic: Configurations
Replies: 1
Views: 75

Configurations

Just wanting to make sure..

When we are given a problem such as....

Write the electron configurations of (a)the copper (I) ion and (b) the copper(II) ion does "copper (I)" signify that are asking for the configuration of Cu+? and "copper (II)" Cu2+?
Thanks!
by Jonathan Marcial Dis 1K
Thu May 10, 2018 1:45 pm
Forum: Quantum Numbers and The H-Atom
Topic: Homework Question 2.41
Replies: 3
Views: 253

Homework Question 2.41

For part B) could someone help me with understanding why quantum number {5,0,-1,+1/2} is invalid?

Thanks!
by Jonathan Marcial Dis 1K
Wed May 09, 2018 4:41 pm
Forum: Properties of Light
Topic: Quiz 2 Question #6
Replies: 2
Views: 145

Re: Quiz 2 Question #6

Messed up on the decimal is what it was. Thank you!
by Jonathan Marcial Dis 1K
Wed May 09, 2018 3:21 pm
Forum: Properties of Light
Topic: Quiz 2 Question #6
Replies: 2
Views: 145

Quiz 2 Question #6

Hi so I was looking at the post that was similar to this one. But I still dont know how to convert my answers to nanometers. I got stuck on the second part. The question is: Radio stations use radio waves to send sounds through the air. Radio waves have a frequency of about 7 X10^6 Hz. Determine the...
by Jonathan Marcial Dis 1K
Sun May 06, 2018 12:35 pm
Forum: Limiting Reactant Calculations
Topic: Test #1 Q. 5
Replies: 2
Views: 214

Re: Test #1 Q. 5

Okay this makes a little more sense than what I was doing. Thank you
by Jonathan Marcial Dis 1K
Sun May 06, 2018 12:34 pm
Forum: Molarity, Solutions, Dilutions
Topic: Test 1 Q.1
Replies: 3
Views: 229

Re: Test 1 Q.1

Thank you so much this is very much appreciated!
by Jonathan Marcial Dis 1K
Sun May 06, 2018 11:55 am
Forum: Limiting Reactant Calculations
Topic: Test #1 Q. 5
Replies: 2
Views: 214

Test #1 Q. 5

Maltotriose C18H32O16, 504.437 g/mol is used in the body according to the following overall reaction: C18H32O16 (s) + 18 O2 (g) --> 18 CO2 (g) + 16 H2o (g) If you eat something containing 10.0 g of maltotriose, what mass of oxygen must you inhale for the maltotriose to react completely? What I did w...
by Jonathan Marcial Dis 1K
Sun May 06, 2018 11:42 am
Forum: Molarity, Solutions, Dilutions
Topic: Test 1 Q.1
Replies: 3
Views: 229

Test 1 Q.1

Anhydrous calcium chloride is a salt which is used increasing water hardness in swimming pools. A solution of CaCl2 is prepared by dissolving 4.00 g of salt to 1.00 L water. What is the concentration of chloride ions for the above solution? b) The above solution is diluted with 1.00 L of 0.400 M pot...
by Jonathan Marcial Dis 1K
Sat May 05, 2018 10:30 pm
Forum: Quantum Numbers and The H-Atom
Topic: Energy levels and Orbitals
Replies: 3
Views: 229

Re: Energy levels and Orbitals

The principal quantum number specifies the energy of an orbital in a one-electron atom. In such a scenario all orbitals with the same value of the principal quantum number, n, have the same energy and hence belong to the same shell of an atom.
by Jonathan Marcial Dis 1K
Sat May 05, 2018 10:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes and Nodal Planes
Replies: 1
Views: 100

Re: Nodes and Nodal Planes

If you look in your book on page 39, the nodal plane is described to you as a divider between 2 lobes of the p-orbital. It cuts through the nucleus and here the probability of finding an electron is zero and where psi is equal to zero. These nodal planes serve as just that, a plane, a larger surface...
by Jonathan Marcial Dis 1K
Thu May 03, 2018 9:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework question 2.1
Replies: 2
Views: 77

Re: Homework question 2.1

It did! Thank you so much!
by Jonathan Marcial Dis 1K
Thu May 03, 2018 8:34 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework question 2.1
Replies: 2
Views: 77

Homework question 2.1

Can someone help explain what n and l represent in sense of this problem. I do know that the radius will increase and I do know that the energy of the electron will increase, but I can’t quite understand n and l. Thanks.
by Jonathan Marcial Dis 1K
Fri Apr 27, 2018 9:14 am
Forum: Properties of Light
Topic: Homework question 1.27 [ENDORSED]
Replies: 3
Views: 151

Homework question 1.27 [ENDORSED]

How would we calculate moles of photons in homework problem 1.27?
by Jonathan Marcial Dis 1K
Thu Apr 26, 2018 11:54 pm
Forum: DeBroglie Equation
Topic: Conversion [ENDORSED]
Replies: 2
Views: 151

Re: Conversion [ENDORSED]

Wait just kidding I saw my mistake that was made when doing the problem!
by Jonathan Marcial Dis 1K
Thu Apr 26, 2018 11:32 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module Question [ENDORSED]
Replies: 5
Views: 300

Re: Photoelectric Effect Module Question [ENDORSED]

I’m almost certain the answer to that would be UV, but I could be wrong. In Dr. Lavelle’s modules he explains it using UV. For sure visible light would not eject electrons.
by Jonathan Marcial Dis 1K
Thu Apr 26, 2018 11:27 pm
Forum: DeBroglie Equation
Topic: Conversion [ENDORSED]
Replies: 2
Views: 151

Conversion [ENDORSED]

How would you convert something like -4.09 x 10^-19 into nanometers?
by Jonathan Marcial Dis 1K
Sun Apr 22, 2018 9:57 pm
Forum: Einstein Equation
Topic: eV to Joules [ENDORSED]
Replies: 1
Views: 158

eV to Joules [ENDORSED]

How do i convert eV to joules?
by Jonathan Marcial Dis 1K
Sun Apr 22, 2018 9:51 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: ∆P and ∆X
Replies: 5
Views: 255

∆P and ∆X

I was very confused on when to use Delta P and Delta X. Can someone help explain that?
by Jonathan Marcial Dis 1K
Sun Apr 22, 2018 6:47 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 12
Views: 426

Photoelectric Effect

When a photon hits a metal surface, an electron is only occasionally emitted. I forget, does the energy of the photon have to be greater than or equal to the energy of the electron in order for the electron to be emitted? Thanks.
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 10:27 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants
Replies: 5
Views: 283

Limiting Reactants

When determining the amounts in limiting reactants of a molecule, do we multiply 1 mole of that atom by the stoichiometric coefficient in the balanced equation? for example in CaC2 + 2 H2O -> Ca(OH)2 + C2H2 do we multiply the moles of CaC2 by 2 because of the 2 moles of hydrogen?
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 7:06 pm
Forum: Limiting Reactant Calculations
Topic: Reagent vs. Reactant [ENDORSED]
Replies: 6
Views: 500

Re: Reagent vs. Reactant [ENDORSED]

I had the same problem and this is the link to where they answer it for me. Hope it helps!

viewtopic.php?f=13&t=30740
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 7:03 pm
Forum: Significant Figures
Topic: Rounding: when and where?
Replies: 10
Views: 503

Re: Rounding: when and where?

When you're rounding you just have to stay constant. For instance, if I round my very first solution to the 3rd decimal place, round the rest of your solutions to the 3rd decimal place.
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 6:59 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity
Replies: 3
Views: 135

Re: Molarity

Okay, this helps! Thank you!
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 6:58 pm
Forum: Balancing Chemical Reactions
Topic: Writing Products
Replies: 2
Views: 175

Writing Products

If we are told that a certain atom, for example, KCl combusts we obviously know. However, when we balance it out how do we write the product?

KCl + O2 =

A)KCl + O2
B)KClO2

or does it not matter?
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 6:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity
Replies: 3
Views: 135

Molarity

How do we solve for molarity when we are given the amount of a solute in grams and then adding even more water? For example... "A solution is prepared by dissolving 55.1 g of KCl in approximately 75 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCl(aq) i...
by Jonathan Marcial Dis 1K
Sun Apr 15, 2018 6:29 pm
Forum: Limiting Reactant Calculations
Topic: Reactants and reagents
Replies: 2
Views: 184

Reactants and reagents

I'm just a bit confused on what the difference between reactants and reagents are. Can someone help?

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