Search found 45 matches

by Sreyes_1C
Fri Jan 17, 2020 9:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc & Kp
Replies: 12
Views: 26

Re: Kc & Kp

Elizabeth Harty 1A wrote:Are the calculations the same regardless of whether its concentration of partial pressure?


i believe the calculations are the same so i think its okay as long as you account for any differences in units or something
by Sreyes_1C
Sun Dec 01, 2019 10:20 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Bases
Replies: 4
Views: 231

Re: Bases

bases also react with acids on human skin, which influences how they feel
by Sreyes_1C
Sun Dec 01, 2019 10:13 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids Vs. Bases
Replies: 11
Views: 52

Re: Acids Vs. Bases

https://www.khanacademy.org/science/org ... sted-lowry

I found this video to be helpful with distinguishing the two
by Sreyes_1C
Sun Dec 01, 2019 8:18 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 4
Views: 22

Re: Coordination Number

yes so you would count the number of bonds to figure out the coordination number of the central atom
by Sreyes_1C
Sun Dec 01, 2019 8:10 pm
Forum: *Stereochemistry
Topic: What's a stereocenter?
Replies: 5
Views: 919

Re: What's a stereocenter?

I am not sure but if it is on the final I doubt it'd be very important. As long as you remember that basic definition
by Sreyes_1C
Sun Dec 01, 2019 8:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation Number
Replies: 9
Views: 51

Re: Oxidation Number

the safe way would be to include it always, especially on an exam
by Sreyes_1C
Sun Nov 24, 2019 9:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H3O+
Replies: 11
Views: 70

Re: H3O+

its classification as tetrahedral is based off of it having 4 regions of density, as it will have a lone pair on the O as just the three hydrogrens would not satisfy oxygen
by Sreyes_1C
Sun Nov 24, 2019 8:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 4
Views: 21

Re: Polarity

if they have the same pull opposite of each other, like 4 of the same atoms surrounding a central atom, they will cancel out.
by Sreyes_1C
Sun Nov 24, 2019 8:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Intermolecular forces
Replies: 5
Views: 30

Re: Intermolecular forces

The three major types of intermolecular interactions are London dispersion forces, dipole–dipole interactions and hydrogen bonds
by Sreyes_1C
Sun Nov 24, 2019 8:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 278

Re: Bent vs linear

linear will have no lone pairs so the bond angle will not be altered
by Sreyes_1C
Sun Nov 24, 2019 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs on Cenrtral Atom
Replies: 11
Views: 39

Re: Lone Pairs on Cenrtral Atom

the lone pairs will not attract the other bonds and actually repel them so bond angle decreases
by Sreyes_1C
Sun Nov 17, 2019 10:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: shape
Replies: 3
Views: 31

Re: shape

I think there would only be one, but maybe there are exceptions to where there could technically be more than one
by Sreyes_1C
Sun Nov 17, 2019 9:43 pm
Forum: Hybridization
Topic: Specifics
Replies: 3
Views: 31

Re: Specifics

so far, I do nt believe we should but perhaps later on that will be the case.
by Sreyes_1C
Sun Nov 17, 2019 9:41 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Lone Pairs
Replies: 5
Views: 317

Re: Lone Pairs

A lone pair of electrons at a central atom always tries to repel bonded pair of electrons. So, the bonds are displaced slightly, which leads to a decrease of bond angle.
by Sreyes_1C
Sun Nov 17, 2019 9:00 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Simpler Terms
Replies: 4
Views: 252

Re: Simpler Terms

Paramagnetic compounds are attracted to magnetic fields, they have unpaired electrons. diamagnetic compounds are repelled from magnetic fields. their electrons all have paired spins.
by Sreyes_1C
Sun Nov 17, 2019 8:53 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Covalent Character
Replies: 3
Views: 296

Re: Covalent Character

Mg and Br have a smaller difference in electronegativity
by Sreyes_1C
Sun Nov 17, 2019 8:28 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 80

Re: Test 2 Topics

it is everything from the midterm onwards
by Sreyes_1C
Sun Nov 17, 2019 8:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 7
Views: 32

Re: Shapes

there is linear, trigonal planar, bent, tetrahedral, trigonal pyramidal, trigonal bypyramidal, seesaw, t shaped, octahedral, square pyramidal, square planar
by Sreyes_1C
Sun Nov 17, 2019 7:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining a VSEPR model
Replies: 6
Views: 23

Re: Determining a VSEPR model

I don't believe it matters, as long as the number of regions of electron density is accurate
by Sreyes_1C
Sun Nov 17, 2019 7:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 19
Views: 125

Re: Test 2

it is definitely safe to draw the most stable lewis structure to help with that.
by Sreyes_1C
Sun Nov 17, 2019 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Influence on Molecular Shape
Replies: 4
Views: 21

Re: Influence on Molecular Shape

bond angle is effected by lone pairs on the central atom. the presence of a lone pair decreases bond angle.
by Sreyes_1C
Sun Nov 03, 2019 8:15 pm
Forum: Hybridization
Topic: Electrons
Replies: 13
Views: 358

Re: Electrons

to moves to the next higher energy orbital because it is excited
by Sreyes_1C
Sun Nov 03, 2019 7:58 pm
Forum: Ionic & Covalent Bonds
Topic: In what order do electrons get removed?
Replies: 7
Views: 8273

Re: In what order do electrons get removed?

valence electrons are removed from the highest energy level first
by Sreyes_1C
Sun Nov 03, 2019 7:49 pm
Forum: Bond Lengths & Energies
Topic: Bond energies
Replies: 4
Views: 29

Re: Bond energies

I'm not sure if you mean bond strength, but if you do, single bonds are the weakest. Double bonds are stronger and triple are the strongest
by Sreyes_1C
Sun Nov 03, 2019 7:44 pm
Forum: Bond Lengths & Energies
Topic: Ions for the Midterm
Replies: 3
Views: 34

Re: Ions for the Midterm

I believe we don't have to memorize those random ions. Unless we see them a lot, I doubt we'd have to memorize them
by Sreyes_1C
Sun Nov 03, 2019 7:42 pm
Forum: Bond Lengths & Energies
Topic: Strength of Bonds
Replies: 16
Views: 60

Re: Strength of Bonds

longer bonds are weaker and shorter bonds are stronger.
by Sreyes_1C
Sun Oct 27, 2019 9:02 pm
Forum: Bond Lengths & Energies
Topic: bond lengths for single or double bonds
Replies: 7
Views: 32

Re: bond lengths for single or double bonds

not sure if it varies, but generally, the stronger the bond, the shorter the length. So a triple would be shorter than a double and a double would be shorter than a single
by Sreyes_1C
Sun Oct 27, 2019 8:55 pm
Forum: Ionic & Covalent Bonds
Topic: Double bond placement
Replies: 15
Views: 89

Re: Double bond placement

they can be placed as long as they satisfy the octet rule but you should try drawing a structure with zero formal charge because it will be most stable. the double/triple bonds will help getting the formal charge to zero
by Sreyes_1C
Sun Oct 27, 2019 8:52 pm
Forum: Lewis Structures
Topic: Figuring out When/How to Add a Double Bond
Replies: 3
Views: 25

Re: Figuring out When/How to Add a Double Bond

you would use a double or triple bond to satisfy the number of valence e- each element needs. also they are used to get the formal charge to zero
by Sreyes_1C
Sun Oct 27, 2019 8:48 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 12
Views: 49

Re: Lone Pairs

lone pairs are going to be two single dots next to each other that are not bonded to anything, thus making them lone pairs.
by Sreyes_1C
Sun Oct 27, 2019 8:46 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 75

Re: Electronegativity

Jorge Ramirez_4H wrote:Is electronegativity important when doing electron configurations?

for only electron configurations, it is not really useful. knowing what it is and its trend is more useful for bonds and lewis structures
by Sreyes_1C
Sun Oct 20, 2019 8:54 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: how to prepare
Replies: 22
Views: 135

Re: how to prepare

personally, reading a textbook does not help me, so I always recommend youtube videos. It is good to know what formulas you do not need to memorize, so you can watch these videos over and over again while focusing on learning to apply the formulas and conversions.
by Sreyes_1C
Sun Oct 20, 2019 8:47 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hund's rule and Pauli Exclusion Principle
Replies: 14
Views: 91

Re: Hund's rule and Pauli Exclusion Principle

the relationship would be that they are both necessary in understanding how filling up the orbitals works. You can start by using Hund's rule to make sure each orbital has an electron before doubling up. Then, you can use Pauli's principle to arrange it so each orbital has one up and one down.
by Sreyes_1C
Sun Oct 20, 2019 8:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Short Hand
Replies: 11
Views: 62

Re: Short Hand

since the configurations continue to get longer and longer, you can start the longer configurations with an abbreviation of the noble gas that comes before it. The noble gases are the column all the way to the right and they have full outer shells, which makes it possible for us to use them when doi...
by Sreyes_1C
Sun Oct 20, 2019 7:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin up and spin down
Replies: 13
Views: 99

Re: Spin up and spin down

Since this is only 14a I dont think we should know much more about the details of it than he explains in lecture. I think main thing to remember is the -1/2 and +1/2 numbers and that it is always one down and one up in an orbital
by Sreyes_1C
Sun Oct 20, 2019 7:37 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 8
Views: 62

Re: Orbitals

ATingin_3I wrote:Why is it that each orbital can only hold 2 electrons max?


I suppose its just a given that is defined by the Pauli exclusion rule, along with how the two electrons must have different spins
by Sreyes_1C
Sun Oct 13, 2019 7:41 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 38

Re: Photoelectric Effect

in vacuums, we don't see the same interferences as we would in realistic settings
by Sreyes_1C
Sun Oct 13, 2019 7:38 pm
Forum: Properties of Electrons
Topic: Mass of Electrons
Replies: 6
Views: 24

Re: Mass of Electrons

I believe it is always the same and it was a constant listed in the test sheet last week.
by Sreyes_1C
Sun Oct 13, 2019 7:30 pm
Forum: DeBroglie Equation
Topic: Diffraction patterns
Replies: 4
Views: 35

Re: Diffraction patterns

I like to remember that two in phase waves leads to constructive and two out of phase lead to destructive. What helps me is drawing out what in phase/out of phase waves would look like to visualize how it would lead to destructive or constructive.
by Sreyes_1C
Sun Oct 13, 2019 7:21 pm
Forum: Properties of Light
Topic: Speed of light.
Replies: 10
Views: 55

Re: Speed of light.

yes and it might be one of the constants listed on the test sheets
by Sreyes_1C
Sun Oct 13, 2019 7:15 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2710

Re: Test 1 [ENDORSED]

Jasmine Kim 3H wrote:If we need to use the answer of one question for the next question and our answer for the first question is wrong, will we not get full credit for the second, even if our calculations on the second were correct?

not entirely sure, but i believe you should still get some points for accurate process
by Sreyes_1C
Mon Oct 07, 2019 11:57 pm
Forum: Empirical & Molecular Formulas
Topic: Polyatomic Ions/Naming Compounds
Replies: 6
Views: 128

Re: Polyatomic Ions/Naming Compounds

705327693 wrote:Do we have to know this stuff for the first test?

I would like to assume it wouldn't be directly tested on the first test but more than likely it would be necessary later on in the course
by Sreyes_1C
Mon Oct 07, 2019 11:54 pm
Forum: Balancing Chemical Reactions
Topic: When are atoms lost or created?
Replies: 14
Views: 198

Re: When are atoms lost or created?

Its always good to remember mass is neither created or destroyed. However it can be confusing since he mentioned something about atoms being destroyed in nuclear reactions, but pretty sure we won't see that in this class
by Sreyes_1C
Mon Oct 07, 2019 11:47 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2710

Re: Test 1 [ENDORSED]

A bluebook is not mentioned in the syllabus for the first test
by Sreyes_1C
Mon Oct 07, 2019 11:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 129
Views: 2865

Re: Advice from a Medical Student - Part II [ENDORSED]

It was so great to hear your story. Often times it feels like we should know exactly what we want to do with our careers but it is nice to see an example of success while not knowing exactly each step going forward.

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