Search found 44 matches

by Pablo 3I
Mon Nov 18, 2019 9:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs & Polarity
Replies: 3
Views: 16

Re: Lone Pairs & Polarity

Simply depends on the atoms in the molecule, play around with it to see if it does.
by Pablo 3I
Mon Nov 18, 2019 9:51 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Determining the greater boiling point
Replies: 4
Views: 29

Re: Determining the greater boiling point

Look art inter molecular forces in a molecule; the strength of forces involved will determine the melting point!
by Pablo 3I
Mon Nov 18, 2019 9:48 pm
Forum: Hybridization
Topic: Test 2
Replies: 6
Views: 35

Re: Test 2

Don't worry about it, only sigma and pi bonds.
by Pablo 3I
Mon Nov 18, 2019 9:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 52
Views: 274

Re: Advice for studying

After lecture, perhaps chill for about 30 minutes (if you know going back to your place will make you lazy), hit a study room or library and after cooling down and relaxing (when u have time), look at video modules and perhaps look up complicated concepts andd see how other people teach it. Practice...
by Pablo 3I
Mon Nov 18, 2019 9:46 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 3
Views: 12

Re: Dipole moments

Yes you place the dipole moment towards the atom with more electronegativity.
by Pablo 3I
Mon Nov 18, 2019 9:44 pm
Forum: Lewis Structures
Topic: double and triple bonds
Replies: 6
Views: 25

Re: double and triple bonds

Why does arsenic have lone pairs? And how would you know it would have lone pairs being the central atom? From practice what helps me is abiding b y the rules of electronegativity. Though if it helps play with the problem by filling up all bound atoms valence shells and if electrons are left over i...
by Pablo 3I
Mon Nov 18, 2019 9:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Class Curve?
Replies: 4
Views: 56

Re: Class Curve?

Will be determined by class average but surely there will be a form of curve.
by Pablo 3I
Mon Nov 18, 2019 9:38 pm
Forum: Ionic & Covalent Bonds
Topic: Lone pairs
Replies: 4
Views: 20

Re: Lone pairs

Lone pairs are placed as far as possible to minimize electron repulsion.
by Pablo 3I
Mon Nov 18, 2019 9:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 5
Views: 25

Re: Trigonal Bipyramidal

E- density influences shape of molecule but is not counted in the molecular shape naming of the molecule. Only bound atoms are.
by Pablo 3I
Mon Nov 18, 2019 9:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 7
Views: 31

Re: Test 2

Stick with bent as it is the term that is mostly used. Perhaps more concise in terms of what Lavelle is looking for.
by Pablo 3I
Mon Nov 18, 2019 9:31 pm
Forum: Hybridization
Topic: Test 2
Replies: 11
Views: 48

Re: Test 2

Dont worry about it, luckily just pi and sigma bonds. We should be good just memorize the shapes and electron geometry.
by Pablo 3I
Mon Nov 18, 2019 9:30 pm
Forum: Dipole Moments
Topic: Net Dipole Moment
Replies: 4
Views: 17

Re: Net Dipole Moment

Yes, since as mentioned above, in an octahedral shape, it is most stable and net dipole moments is 0.
by Pablo 3I
Mon Nov 18, 2019 9:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE formula
Replies: 9
Views: 26

Re: AXE formula

A is the middle atom and will never have a subscript. Only E (lone pairs of the central atom) and X (bound atoms) can have subscripts.
by Pablo 3I
Mon Nov 18, 2019 9:27 pm
Forum: Lewis Structures
Topic: lone pairs
Replies: 3
Views: 10

Re: lone pairs

Do your normal lewis diagram and ensure all electrons are accounted for. If all bound atoms are full it means there is most likely a central atom with an expanded octet.
by Pablo 3I
Sat Nov 09, 2019 9:52 pm
Forum: Dipole Moments
Topic: Dipole Dipole
Replies: 3
Views: 13

Re: Dipole Dipole

think about electronegativity, look to see if atoms are far apart in the periodic table. Most likely it will have dipole dipole interactions.
by Pablo 3I
Sat Nov 09, 2019 9:50 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability Trend
Replies: 3
Views: 7

Re: Polarisability Trend

Yes think about atomic radius, increases left and down, that is the trend.
by Pablo 3I
Sat Nov 09, 2019 9:49 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 5
Views: 20

Re: Dissociation Energy

It is the required energy to breaks bonds.
by Pablo 3I
Sat Nov 09, 2019 9:49 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 9
Views: 41

Re: Formal Charge

You always want to meet the net charge if an ion has a 2+ then you want to make sure some atom(s) are charged to meet that 2+. If there is no net charge then yes it will always have to be 0.
by Pablo 3I
Sat Nov 09, 2019 9:47 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 4
Views: 14

Re: Polarizability

Outer electrons are easily distorted in anions. There is a small nuclear charge which means these electrons are held less tightly. Thus why anions are highly polarizable.
by Pablo 3I
Sat Nov 02, 2019 5:17 pm
Forum: Trends in The Periodic Table
Topic: How to compare the electronic affinity between two atoms
Replies: 2
Views: 25

Re: How to compare the electronic affinity between two atoms

Electronegativity always in creased going left to right and down to up. Applies to elements without a full valence shell so CL is much more electronegative.
by Pablo 3I
Sat Nov 02, 2019 5:05 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Stability
Replies: 9
Views: 49

Re: Stability

By having a 0 charge, nothing will interfere (ideally) with the molecule as all electron shells are full. All elements are in the best state to be.
by Pablo 3I
Sat Nov 02, 2019 5:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: How do we draw the electron configurations for transition metal atoms?
Replies: 2
Views: 23

Re: How do we draw the electron configurations for transition metal atoms?

I believe you would simply exclude the d block, and count over them so for example, as mentioned above the number of valence e- for group 15 would all be 5.
by Pablo 3I
Sat Nov 02, 2019 4:59 pm
Forum: Lewis Structures
Topic: double bonds
Replies: 2
Views: 20

Re: double bonds

This is just a fundamental property of Flourine. Since it is very electronegative, it would pull harder all of the atoms' electrons to it if it were in the center of a molecule. Thus; when doing lewis structures, we want the atom with the least amount of electronegativity in the middle. It is a matt...
by Pablo 3I
Sat Oct 26, 2019 9:33 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 8
Views: 52

Re: Drawing Lewis Structures

Arianna Perea 3H wrote:If you leave a lone pair instead of making it a bond, would it be considered wrong?

It depends on the structure as a whole and the overall charge. Try to make bonds but keeping ion mind the overall charge.
by Pablo 3I
Sat Oct 26, 2019 9:28 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Stability
Replies: 9
Views: 49

Re: Stability

The central atom should be of a charge of 0 for the structure of a molecule top be most stable. As for any charges If the whole electron shell is filled that means it will be at its most stable state.
by Pablo 3I
Sat Oct 26, 2019 9:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Notation
Replies: 5
Views: 29

Re: Electron Configuration Notation

yes the second way is more precise as he has said some methods in high school that we know may not be the best way to do problems.
by Pablo 3I
Sat Oct 26, 2019 9:25 pm
Forum: Lewis Structures
Topic: Charges
Replies: 2
Views: 26

Re: Charges

By checking the overall charge you will know if its a cation or an anion, I think thats all that needs to be known.
by Pablo 3I
Sat Oct 26, 2019 9:23 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 6
Views: 39

Re: Resonance

By making double bonds, it makes the structure more even and lone pair electrons are minimized
by Pablo 3I
Sun Oct 20, 2019 5:13 pm
Forum: General Science Questions
Topic: Midterm
Replies: 12
Views: 133

Re: Midterm

Honestly, just hit the workshops and the step up! Practice will be ur best bet to be prepared.
by Pablo 3I
Sun Oct 20, 2019 5:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: Wave Function
Replies: 4
Views: 31

Re: Wave Function

Yea wave function is associated with the three letter l,m,n. And its for electron trajectory really.
by Pablo 3I
Sun Oct 20, 2019 5:09 pm
Forum: Properties of Electrons
Topic: Quantum numbers
Replies: 4
Views: 34

Re: Quantum numbers

They can not exist in the same place at the same time. It is also how we do not know its exact position in the shell but we know its there.
by Pablo 3I
Sun Oct 20, 2019 11:57 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 7
Views: 43

Re: Writing Electron Configurations

As Lavelle said, it is to demonstrate understanding but the regular way to do it isn't wrong in itself. I would stick with that method.
by Pablo 3I
Sun Oct 20, 2019 11:38 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Orbitals with different levels of energy
Replies: 1
Views: 11

Re: Orbitals with different levels of energy

Yes that is correct the order is from s-p-d-f. Think of it as "building up" as suggested in the name.
by Pablo 3I
Sat Oct 12, 2019 10:06 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 12
Views: 75

Re: Black Body Radiation

It is a concept that can not be made to reality since any material to exhibit the properties is impossible. If all wavelengths are absorbed something can be "invisible".
by Pablo 3I
Sat Oct 12, 2019 10:04 pm
Forum: Quantum Numbers and The H-Atom
Topic: Frequency
Replies: 15
Views: 113

Re: Frequency

Energy is directly proportional to frequency, the formula as given above in some other comments E=HV reveals that correlation.
by Pablo 3I
Sat Oct 12, 2019 10:00 pm
Forum: Photoelectric Effect
Topic: Removing electrons in Photoelectric concept
Replies: 2
Views: 14

Re: Removing electrons in Photoelectric concept

Threshold depends on the metal and probably the way we will know is that some info will be given to us.
by Pablo 3I
Sat Oct 12, 2019 9:57 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 786

Re: Speed of Light

No need to worry for the sake of problems, light constant will not change.
by Pablo 3I
Sat Oct 12, 2019 9:54 pm
Forum: Properties of Light
Topic: Quantum Levels
Replies: 9
Views: 56

Re: Quantum Levels

A limit is not defined but pretty sure in. reality there is one. For the sake of the class I do not think it is something too worry about too much.
by Pablo 3I
Thu Oct 03, 2019 11:37 pm
Forum: Limiting Reactant Calculations
Topic: Understanding equations
Replies: 5
Views: 31

Re: Understanding equations

He hasn't mentioned if we have to know the ions though some familiarity may help. Otherwise he would have said that we must memorize a certain list.
by Pablo 3I
Thu Oct 03, 2019 11:32 pm
Forum: SI Units, Unit Conversions
Topic: Knowing Units
Replies: 7
Views: 58

Re: Knowing Units

Yes memorization is most likely required up to kilo (don't think we will use mega or giga) and perhaps nothing under pickometers or angstrom.
by Pablo 3I
Thu Oct 03, 2019 11:28 pm
Forum: Significant Figures
Topic: How would sig figs be used in a problem?
Replies: 7
Views: 29

Re: How would sig figs be used in a problem?

I think the sig figs would probably be a part of a problem but not a question on its own. It is mostly to be precise as you might already know so the way it will be shown is lets say your answer is 1.2732 but as previously given value said there was 100 grams of some molecule, sig figs would be thre...
by Pablo 3I
Wed Oct 02, 2019 11:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 10
Views: 65

Re: Molar Mass

Masses of each element are on the periodic table. Molar Masses are calculated by adding up all the masses of each element in a molecule.
by Pablo 3I
Wed Oct 02, 2019 11:14 pm
Forum: SI Units, Unit Conversions
Topic: SI units for exam
Replies: 6
Views: 49

Re: SI units for exam

Yes, and it varies how many you use, typically the same amount as of a given amount of some substance. EX: 100 g of CAC2 (problem continues on), the sig figs here would be 3 due to the (100).

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