Search found 72 matches

by Guzman_1J
Sun Dec 08, 2019 4:27 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: boiling point of SiH4 vs SiCl4
Replies: 1
Views: 161

boiling point of SiH4 vs SiCl4

Is the reason SiCl4 has a higher boiling point that they have stronger dispersion forces? They are both nonpolar molecules, which means their dipole-dipole forces cancel out, this has an effect on boiling point or what is the reason for this?
by Guzman_1J
Sun Dec 08, 2019 3:32 am
Forum: Naming
Topic: ion at end of name
Replies: 4
Views: 66

ion at end of name

When do we put "ion" at the end of the name of the complex and is that the only other name we put there besides the name of an element?
by Guzman_1J
Sun Dec 08, 2019 2:58 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and polarity
Replies: 8
Views: 107

Re: VSEPR and polarity

Linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral, and square planar shapes are symmetrical which means that molecules of these shapes are nonpolar if all atoms bonded to the central atom are the same. Is it a general rule that all atoms must be the same? If there is a molecule...
by Guzman_1J
Sun Dec 08, 2019 2:28 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal planar Polarity
Replies: 3
Views: 65

Re: Trigonal planar Polarity

Alex Tchekanov wrote:Yes, if one of the attached atoms is different, it is polar.

So if all the atoms are the same, then it is nonpolar?
by Guzman_1J
Sun Dec 08, 2019 2:23 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and polarity
Replies: 8
Views: 107

Re: VSEPR and polarity

Nohemi Garcia 1I wrote:Tetrahedral I believe is one of these examples. It tends to be polar but in cases such as CH4, the structure become neutral. This is because all of the surrounding atoms are the same and their dipoles "cancel out."

Is this the only shape with this characteristic?
by Guzman_1J
Sun Dec 08, 2019 1:30 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and polarity
Replies: 8
Views: 107

Re: VSEPR and polarity

Jacey Yang 3I wrote:A molecule is polar when the central atom has lone pairs and the atoms attached aren’t the same, so the dipoles don’t cancel.

Is this for all molecules?
by Guzman_1J
Sun Dec 08, 2019 12:33 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and polarity
Replies: 8
Views: 107

VSEPR and polarity

Can anyone tell me the general rules about polarity when it comes to shape? I remember Lyndon mentioning during review that certain shapes are always polar unless they're all the same element but was not able to catch everything he said.
by Guzman_1J
Sat Dec 07, 2019 11:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angles
Replies: 5
Views: 67

bond angles

Can someone explain how we knows what the bond angles are? I'm still confused about how we know that, or like how we know that an angle is less than some other angle(for example when they say that an angle is <120, how do they reach that conclusion)?
by Guzman_1J
Fri Dec 06, 2019 4:22 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: hydrogen bonding
Replies: 2
Views: 49

Re: hydrogen bonding

From what I read on 3F.5, hydrogen bonding can happen between H and N, F, or O molecules, but only if the H is already attached to a N, F, or O? So hydrogen bonding is technically not possible if that does not happen(as in, it would just be a regular interaction if one free H attached to an O, and ...
by Guzman_1J
Fri Dec 06, 2019 3:50 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: hydrogen bonding
Replies: 2
Views: 49

hydrogen bonding

From what I read on 3F.5, hydrogen bonding can happen between H and N, F, or O molecules, but only if the H is already attached to a N, F, or O? So hydrogen bonding is technically not possible if that does not happen(as in, it would just be a regular interaction if one free H attached to an O, and n...
by Guzman_1J
Fri Dec 06, 2019 1:06 am
Forum: Sigma & Pi Bonds
Topic: hybridization and sigma and pi bonds
Replies: 1
Views: 48

hybridization and sigma and pi bonds

How would the description of a triple bond between C(sp3 hybridization) and N(sp hybridization) be described? Like the bond between C and H can be described as sigma(Csp3, Hs), would the bond between C and N then be described as just a pi bond (pi(Csp3, Nsp), or would I have to include that it also ...
by Guzman_1J
Fri Dec 06, 2019 12:46 am
Forum: Hybridization
Topic: hybridization
Replies: 3
Views: 35

hybridization

How do you assign hybridization to a lone pair? I get confused by that question, can someone please explain?
by Guzman_1J
Fri Dec 06, 2019 12:09 am
Forum: Hybridization
Topic: hybridization
Replies: 1
Views: 26

hybridization

Is hybridization affected by lone pairs? Like in AsFe3, does As have an sp2 hybridization because it makes three bonds with Fe, or does it have sp3 hybridization because it also has a lone pair?
by Guzman_1J
Wed Dec 04, 2019 12:30 am
Forum: Hybridization
Topic: hybrid orbitals
Replies: 2
Views: 41

hybrid orbitals

How are we supposed to know whether the wavefunction of an orbital is either positive or negative? Do we have to know how to do that or is it enough by knowing what the hybrid orbitals are called? For example, in the book in 2F.2 they gave the example of Carbon, and its four hybrid orbitals- h1=s+px...
by Guzman_1J
Wed Dec 04, 2019 12:23 am
Forum: Hybridization
Topic: hybridization
Replies: 3
Views: 35

hybridization

So hybridization only rises as a result of electron promotion in an element?
by Guzman_1J
Tue Dec 03, 2019 11:52 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Notes of November 25
Replies: 4
Views: 73

Re: Notes of November 25

Rosa Munoz 4D wrote:Yeah! Where do you want me to send them to you?

My email is yesigr918@gmail.com
Thank you so much!
by Guzman_1J
Tue Dec 03, 2019 11:15 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: sigma and pi bonds
Replies: 2
Views: 52

sigma and pi bonds

For this class, can we fully go with the assumption that ALL single covalent bonds are sigma bonds, double bonds are one sigma and one pi, and triple bonds are two pi bonds and one sigma bond? Or are there other rules to figure out what type of bonds there are in an interaction?
by Guzman_1J
Sun Dec 01, 2019 9:02 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Final Study Methods
Replies: 11
Views: 91

Re: Final Study Methods

What helped me was reading the textbook! Lecture makes it hard to absorb everything in for me, specially since the slides are just blocks of writing and going through the textbook instead lets me go over the material easily and at my own pace.
by Guzman_1J
Sun Dec 01, 2019 8:49 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: notes
Replies: 2
Views: 34

notes

I was going through my notes and there's something I didn't fully understand: "oxoacids more readily lose H+ if resulting anion is stabilized by electron withdrawing atoms which delocalize and stabilized the negative charge". Could someone explain how the electron withdrawing atoms influen...
by Guzman_1J
Sun Dec 01, 2019 7:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination sphere
Replies: 1
Views: 19

coordination sphere

What exactly is the coordination sphere? Is it only to describe the space taken up by the bonded atoms?
by Guzman_1J
Sun Dec 01, 2019 7:37 pm
Forum: Hybridization
Topic: hybridization
Replies: 3
Views: 52

hybridization

Does hybridization only happen between the last orbitals of the elements whose orbitals are overlapping, or can it also happen between orbitals that are closer to their nucleus?
by Guzman_1J
Sun Dec 01, 2019 7:16 pm
Forum: Hybridization
Topic: hybridization
Replies: 2
Views: 30

hybridization

So is hybridization the overlap of orbitals between two elements and it's also possible for only a single element(the example in class about CH4, C had sp3 hybridization)? How exactly does hybridization work? Where they overlap its like they become one orbital and share the number of electrons betwe...
by Guzman_1J
Sun Dec 01, 2019 6:45 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Notes of November 25
Replies: 4
Views: 73

Notes of November 25

I was not able to go to lecture on Monday so I was wondering if anyone could share their notes with me please? Or does Lavelle upload his lecture presentations somewhere? I feel like I really need them because I felt a little lost on Wednesday's lecture :( please help out a fellow student
by Guzman_1J
Sun Nov 24, 2019 9:11 pm
Forum: Hybridization
Topic: hybridization
Replies: 5
Views: 78

hybridization

Is hybridization just a blend of all resonance structures or is it atoms making certain bonds? I'm still a little confused on the topic.
by Guzman_1J
Sun Nov 24, 2019 9:04 pm
Forum: Ionic & Covalent Bonds
Topic: ligands
Replies: 5
Views: 108

ligands

What kind of atoms are ligands? From the lecture in class, what I understood is that ligands are attached to a central atom, but is the name given because they're a different type of atom or something?
by Guzman_1J
Sun Nov 24, 2019 8:52 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 19
Views: 187

sigma and pi bonds

Are all single bonds sigma bonds and double bonds pi and sigma?
by Guzman_1J
Wed Nov 20, 2019 8:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 5
Views: 78

Test 2

In regards to the book, until what topic will be covered on Test 2? Is it just going to be Molecular Shape and Structure(2E-F) or is it going to go past that into Coordination Compounds and their Biological Importance?
by Guzman_1J
Mon Nov 18, 2019 1:06 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Midterm
Replies: 2
Views: 73

Midterm

Why was the ground state of calcium given as Ca2+? I got this question wrong for the midterm even though I wrote the right electron configuration for Ca.
by Guzman_1J
Thu Nov 14, 2019 9:38 pm
Forum: Ionic & Covalent Bonds
Topic: Homework for Week 7
Replies: 2
Views: 41

Homework for Week 7

Can we still turn in homework assigned for chemical bonds for this week?
by Guzman_1J
Wed Nov 06, 2019 4:02 pm
Forum: Properties of Light
Topic: test room
Replies: 2
Views: 99

test room

Sorry but I've been looking through emails and the syllabus and i havent found where the test room is at. Where is the test at? :/
by Guzman_1J
Wed Nov 06, 2019 1:50 am
Forum: Lewis Structures
Topic: 12 in Dino nuggets
Replies: 2
Views: 49

12 in Dino nuggets

Can someone explain how they got to the right answer for 12b and c from the practice problems we were given?
by Guzman_1J
Wed Nov 06, 2019 1:45 am
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 3
Views: 46

octet exceptions

Which are the elements that can have an expanded octet and by how much? I know P is 10, S is 12, but what about the other ones
by Guzman_1J
Tue Nov 05, 2019 8:27 pm
Forum: Empirical & Molecular Formulas
Topic: Number 1 in Dino Nuggets
Replies: 3
Views: 108

Number 1 in Dino Nuggets

How did y'all solve problem #1 in the practice problems given? I keep getting the wrong answer and I need some help!! I'm finding the moles of CO2 and H2O to get the grams of C and H, but once I subtract the grams to find grams of O and get the moles I get .012 mol for C, .0169 mol of H and .0048 mo...
by Guzman_1J
Tue Nov 05, 2019 12:46 am
Forum: Properties of Electrons
Topic: Electron affinity
Replies: 3
Views: 78

Electron affinity

Is electron affinity the same as electronegativity or does it refer to something else? If so, do we need to know about it?
by Guzman_1J
Tue Nov 05, 2019 12:19 am
Forum: Properties of Electrons
Topic: Ionization energy
Replies: 3
Views: 73

Ionization energy

Do we need to know anything about the second ionization energy of an element, or are we good with only the first ionization energy?
by Guzman_1J
Mon Nov 04, 2019 7:11 pm
Forum: *Shrodinger Equation
Topic: Shrodinger equation
Replies: 7
Views: 127

Re: Shrodinger equation

Natalie Nartz 4F wrote:I don't believe we'll need to memorize this for the exam. I think Lavelle even mentioned an alternative equation to use instead.

What was the alternative equation?
by Guzman_1J
Mon Nov 04, 2019 4:52 pm
Forum: *Shrodinger Equation
Topic: Shrodinger equation
Replies: 7
Views: 127

Shrodinger equation

Is this going to be on the test? I don’t think we went over this one In detail.
by Guzman_1J
Mon Nov 04, 2019 4:18 pm
Forum: Quantum Numbers and The H-Atom
Topic: Orbital angular momentum
Replies: 4
Views: 90

Orbital angular momentum

Do we need to know the Orbital angular momentum equation?
by Guzman_1J
Mon Nov 04, 2019 12:44 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: En=-hR/n^2
Replies: 1
Views: 32

En=-hR/n^2

When do we use En=-hR/n^2?
by Guzman_1J
Sun Nov 03, 2019 11:33 pm
Forum: Properties of Light
Topic: UV
Replies: 2
Views: 41

UV

does UV wavelength start at 10nm or 100nm?
by Guzman_1J
Sun Nov 03, 2019 9:51 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 2
Views: 33

Midterm

How much about chemical bonds do we need to know for this test? Is all of the Learning Outcomes from chemical bonds listed on the pdf on the website going to be on the test?
by Guzman_1J
Tue Oct 29, 2019 3:51 pm
Forum: *Particle in a Box
Topic: En =((h^2)(n^2))/(8 m L^2)
Replies: 1
Views: 78

En =((h^2)(n^2))/(8 m L^2)

Have we gone over this equation En =((h^2)(n^2))/(8 m L^2)? We were not assigned any hw problems from 1C but the equation is in the sheet in the website. Have we gone over it in class?
by Guzman_1J
Mon Oct 28, 2019 11:48 pm
Forum: *Particle in a Box
Topic: Topic 1C
Replies: 3
Views: 79

Re: Topic 1C

For the Quantum World? Where it says to "Omit 1C and Table 1D.1"? I'm just wondering because En =((h^2)(n^2))/(8 m L^2) is an equation that is in the Constant and Equations sheet on the website, but Appendix 1C is about scientific notation, I mean Topic 1C on page 23 because we were also n...
by Guzman_1J
Mon Oct 28, 2019 11:26 pm
Forum: *Particle in a Box
Topic: Topic 1C
Replies: 3
Views: 79

Topic 1C

I did not see Topic 1C homework problems in the syllabus. Does this mean we do not have to know the stuff on that part for any tests?
by Guzman_1J
Mon Oct 28, 2019 8:54 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg formula
Replies: 2
Views: 48

Rydberg formula

Which is the Rydbger formula? In the texbook it shows it as 1/wavelength=Rh((1/n1^2)-(1/n2^2) but while solving a problem in discussion that asked for it, a student used En=hR/n^2 but I did not see that formula in the texbook for part 1A. I have missed lecture in one of the past weeks so I might hav...
by Guzman_1J
Mon Oct 28, 2019 8:00 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Example 1B.5 in textbook
Replies: 1
Views: 38

Example 1B.5 in textbook

For Example 1B.5 in textbook Using the uncertainty principle, when grams and mm/s is being converted into SI units they are multiplied by 2 once they have been converted but the textbook does not explain why. Does anybody understand this problem? I know how we are supposed to use the equation, it's ...
by Guzman_1J
Sat Oct 26, 2019 3:44 pm
Forum: Photoelectric Effect
Topic: kinetic energy
Replies: 6
Views: 77

kinetic energy

Do we need to know the kinetic energy equation given for when an electron is ejected?
by Guzman_1J
Sat Oct 26, 2019 3:02 pm
Forum: Properties of Light
Topic: frequency/intensity
Replies: 2
Views: 42

frequency/intensity

Does intensity of radiation have to do with its frequency?
by Guzman_1J
Sat Oct 26, 2019 12:16 am
Forum: Properties of Light
Topic: emission vs absorption
Replies: 2
Views: 37

emission vs absorption

What does the emission spectrum tells us and how is this different from what the absorption spectrum shows? I'm a little confused about the emission spectrum, does it only work for the hydrogen element(since the lyman and Balmer series are just for hydrogen(?))?
by Guzman_1J
Fri Oct 25, 2019 11:04 pm
Forum: Properties of Light
Topic: visible light
Replies: 2
Views: 35

visible light

For this class, do we need to know the exact frequency and wavelength for the colors of visible light(violet to red)?
by Guzman_1J
Fri Oct 25, 2019 9:19 pm
Forum: Properties of Light
Topic: Hz vs. frequency
Replies: 7
Views: 126

Hz vs. frequency

Can someone explain the differences between hertz and frequency? From the book, they sound like the same thing but is hertz just the unit, so if we are asked for the frequency we have to answer in hertz or how exactly are they related?
by Guzman_1J
Fri Oct 25, 2019 3:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: Test 1- Q5b
Replies: 4
Views: 111

Re: Test 1- Q5b

Yeah I'm not sure how to get 2.99 mL, but that's what the TA put on my paper should have been my answer.
by Guzman_1J
Fri Oct 25, 2019 3:49 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm 2
Replies: 4
Views: 51

Midterm 2

Up until what topics would we be covering for Midterm 2? Is it gonna be cumulative with stuff all the way from Week 1?
by Guzman_1J
Thu Oct 24, 2019 4:27 pm
Forum: Properties of Electrons
Topic: hw
Replies: 6
Views: 73

hw

For this week's homework, can we still turn in homework problems from The Quantum World section in the syllabus?
by Guzman_1J
Sun Oct 20, 2019 10:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: understanding orbitals
Replies: 3
Views: 29

Re: understanding orbitals

So n=1 can hold more than two electrons?
by Guzman_1J
Sun Oct 20, 2019 10:08 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg
Replies: 3
Views: 32

Heisenberg

I don't understand exactly how finding the uncertainty in an electron's velocity to be greater than the speed of light tells us that its not localized at the nucleus. How can we come to that conclusion from that information?
by Guzman_1J
Sun Oct 20, 2019 10:05 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg
Replies: 5
Views: 46

Heisenberg

So the Heisenberg uncertainty principle has to do with BOTH the physical limit to the min. size that atoms can exist, and to the momentum and position of an electron? How exactly are they related?
by Guzman_1J
Sun Oct 20, 2019 9:56 pm
Forum: Molarity, Solutions, Dilutions
Topic: Test 1- Q5b
Replies: 4
Views: 111

Re: Test 1- Q5b

Yes, I got 3x10^-6mL, when the answer should have been 2.99 mL.
by Guzman_1J
Sun Oct 20, 2019 9:29 pm
Forum: Molarity, Solutions, Dilutions
Topic: Test 1- Q5b
Replies: 4
Views: 111

Test 1- Q5b

Could anybody who understood problem 5b explain the right way to do it? I got right the first part of the problem (5a) but i got b wrong, and I was wondering where I went wrong.I used M1V1=M2V2 to solve the problem with M1=.21, M2=2.68x10^-3, and V2=.24.
by Guzman_1J
Sun Oct 20, 2019 9:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: understanding orbitals
Replies: 3
Views: 29

understanding orbitals

So every n has a certain number of s(1),p(3),d(5), & f(7) orbitals, and these orbitals can each hold up to two electrons? Does this mean that even n=1 has all these orbitals?
by Guzman_1J
Sun Oct 20, 2019 6:55 pm
Forum: Quantum Numbers and The H-Atom
Topic: spin magnetic quantum #
Replies: 2
Views: 24

spin magnetic quantum #

How do we know when ms is negative or positive 1/2?
by Guzman_1J
Sun Oct 13, 2019 8:39 pm
Forum: Properties of Electrons
Topic: N increase
Replies: 2
Views: 10

Re: N increase

the electron gains energy when n increases
by Guzman_1J
Sun Oct 13, 2019 8:37 pm
Forum: Properties of Electrons
Topic: Mass of a neutron (1B.23)
Replies: 2
Views: 28

Re: Mass of a neutron (1B.23)

You don't have to find the mass, as its given: 1.675*10^-27 kg
by Guzman_1J
Sun Oct 13, 2019 8:33 pm
Forum: Properties of Electrons
Topic: Energy Level (Absorption and Emission)
Replies: 2
Views: 28

Re: Energy Level (Absorption and Emission)

when an e- moves further away from the nucleus, it would need energy to do this, thus it gains energy. To move closer to the nucleus, the opposite is true.
by Guzman_1J
Sun Oct 13, 2019 8:18 pm
Forum: Properties of Electrons
Topic: last part of 1E.1
Replies: 1
Views: 6

Re: last part of 1E.1

All of the answers seem to be correct. When an electron moves to a bigger orbit, it gains energy. The radius of the atom also increases because an electron moving to a bigger orbit(from a small n to a big n) makes the size of the atom bigger.
by Guzman_1J
Sun Oct 13, 2019 8:11 pm
Forum: Properties of Electrons
Topic: electrons
Replies: 3
Views: 33

electrons

Is there a way someone can explain to me how electrons can be both a wave AND a particle?
by Guzman_1J
Sun Oct 06, 2019 10:58 pm
Forum: Significant Figures
Topic: Significant Figures Cases
Replies: 2
Views: 87

Re: Significant Figures Cases

Sorry but why is 0.0001 and 0.00010 considered to have only 1 and 2 significant figures respectively? Why is it not 4 and 5 instead?
by Guzman_1J
Sun Oct 06, 2019 10:49 pm
Forum: SI Units, Unit Conversions
Topic: SI Units
Replies: 2
Views: 45

SI Units

I went to a Step Up session today and I was told that we didn't necessarily had to convert all units to SI units(like grams to kg) if the rest of the units were the same(as in if everything was already written in g, then we did not have to convert units), is this true for the exam?
by Guzman_1J
Sun Oct 06, 2019 10:45 pm
Forum: SI Units, Unit Conversions
Topic: Test 1
Replies: 9
Views: 160

Test 1

I was wondering if molarity and dilution calculations would be part of the test? I'm confused about this since I didn't think it was one of the topics we had to review from the Audio Visual Focus Topics.
by Guzman_1J
Sun Oct 06, 2019 5:15 pm
Forum: SI Units, Unit Conversions
Topic: Peer Learning [ENDORSED]
Replies: 2
Views: 52

Peer Learning [ENDORSED]

I'm not sure if this is the place to ask this, but I was wondering if anyone could share their experience attending the Peer Learning sessions. I did not enroll for any last year but I was wondering if it would be more advantageous to do so for this class.
by Guzman_1J
Sun Oct 06, 2019 5:11 pm
Forum: SI Units, Unit Conversions
Topic: Test 1
Replies: 5
Views: 138

Test 1

What topics will the first test be covering?

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