Search found 63 matches

by Samin Kabir
Tue Dec 15, 2020 7:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem community points
Replies: 16
Views: 157

Re: Chem community points

Chem_Mod wrote:I extended it to 10am Thursday for students to post for extended week 10.

Are all our grades (including the final) going to be available by Thursday or will it just be chem community points??
by Samin Kabir
Tue Dec 15, 2020 10:35 am
Forum: Administrative Questions and Class Announcements
Topic: Chem community points
Replies: 16
Views: 157

Chem community points

Hello,

So I know this is more personal and not really science related but I finished all my 50 posts and did 5 posts per week but it still says in that grade book that I didn't finish all 50 posts and only did 45. Is that going to change soon, or did I do something wrong?
by Samin Kabir
Sun Dec 13, 2020 11:01 am
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 266
Views: 36430

Re: Final Jitters

For me, I watch a lot of SNL or something funny ig right before the test so I don't worry about it that much. That always calms me down.
by Samin Kabir
Thu Dec 10, 2020 6:12 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acids
Replies: 6
Views: 49

Polyprotic Acids

Are these basically acids with multiple hydrogens?
by Samin Kabir
Thu Dec 10, 2020 6:06 pm
Forum: Air Pollution & Acid Rain
Topic: Why does acid rain exist
Replies: 13
Views: 181

Why does acid rain exist

Why does acid rain exist. Is it because of air pollution, and what can be down about it?
by Samin Kabir
Wed Dec 09, 2020 8:56 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Application of Heisenberg's Uncertainty
Replies: 2
Views: 49

Application of Heisenberg's Uncertainty

Why does the Heisenberg Uncertainty equation apply to only small objects and not big objects?
by Samin Kabir
Wed Dec 09, 2020 8:55 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: Bonding sites
Replies: 2
Views: 26

Bonding sites

So in order to calculate the number of h bonding sites what do we need to do?
by Samin Kabir
Tue Dec 08, 2020 11:28 am
Forum: Properties of Light
Topic: Frequency and amplitude
Replies: 7
Views: 79

Frequency and amplitude

What would be the relationship between frequency and amplitude?
by Samin Kabir
Sun Dec 06, 2020 9:47 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH or pOH for Strong & Weak Acids & Bases
Replies: 2
Views: 25

Calculating pH or pOH for Strong & Weak Acids & Bases

What pH range is considered neutral? What about for Acidic? Basic?
by Samin Kabir
Sun Dec 06, 2020 9:41 pm
Forum: Lewis Acids & Bases
Topic: Salts as Acids and Bases
Replies: 3
Views: 49

Salts as Acids and Bases

How would you determine whether a salt is an acid or a base?
by Samin Kabir
Sun Dec 06, 2020 9:38 pm
Forum: Conjugate Acids & Bases
Topic: Formula of conjugate base and acids
Replies: 2
Views: 30

Formula of conjugate base and acids

How do you write the formula of a conjugate acid and a conjugate base. Like, what's the basic structure.
by Samin Kabir
Sun Dec 06, 2020 9:36 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids and Bronsted Bases
Replies: 4
Views: 18

Bronsted Acids and Bronsted Bases

What are Bronsted Acids and Bases. I didn't really understand it in the lecture. Like, how would you be able to identify one?
by Samin Kabir
Sun Dec 06, 2020 9:34 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids and Strong Bases
Replies: 6
Views: 56

Strong Acids and Strong Bases

How do you classify between strong acids and weak acids? What would be the main difference between the two?
by Samin Kabir
Mon Nov 30, 2020 5:36 pm
Forum: Student Social/Study Group
Topic: Final Format
Replies: 35
Views: 329

Re: Final Format

Claire_Kim_2F wrote:Will they be proctoring through zoom again during that specific time so all the tas students will be in the zoom?

According to the Syllabus, he wants to do something like that in case we have questions about the exam while taking it.
by Samin Kabir
Sun Nov 29, 2020 9:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation State
Replies: 3
Views: 46

Oxidation State

What is the oxidation state of a metal species? Is that like oxidation number?
by Samin Kabir
Sun Nov 29, 2020 8:59 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape and Coordination Number
Replies: 4
Views: 38

Shape and Coordination Number

How do you use coordination number to determine the shape of the molecule?
by Samin Kabir
Sun Nov 29, 2020 8:57 pm
Forum: Student Social/Study Group
Topic: Final Format
Replies: 35
Views: 329

Re: Final Format

Samin Kabir wrote:Will we need to be proctored by our TAs?

NEvermind I just read the syllabus... ignore this question
by Samin Kabir
Sun Nov 29, 2020 8:54 pm
Forum: Student Social/Study Group
Topic: Final Format
Replies: 35
Views: 329

Re: Final Format

Will we need to be proctored by our TAs?
by Samin Kabir
Sun Nov 29, 2020 8:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number/ SAPLING EXERCISE 2
Replies: 3
Views: 36

Coordination number/ SAPLING EXERCISE 2

How do you classify coordination compounds via coordination number.
by Samin Kabir
Sun Nov 29, 2020 8:46 pm
Forum: Naming
Topic: Coordination Compounds
Replies: 5
Views: 40

Coordination Compounds

What are coordination compounds? What are the rules in terms of naming them?
by Samin Kabir
Sun Nov 22, 2020 7:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity through shape
Replies: 8
Views: 90

Polarity through shape

How can someone determine the polarity of a molecule through the shape of it's lewis structure?
by Samin Kabir
Sun Nov 22, 2020 7:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling Homework Question 17
Replies: 2
Views: 28

Sapling Homework Question 17

This is the question:

Draw the three possible structures of C3H4. Be sure to include all atoms.

How can one approach this problem?
by Samin Kabir
Sun Nov 22, 2020 7:31 pm
Forum: Sigma & Pi Bonds
Topic: Delocalized pi bonds
Replies: 2
Views: 32

Delocalized pi bonds

What does it mean for a pi bond to be delocalized? How can one differentiate them in a lewis structure of a molecule?
by Samin Kabir
Sun Nov 22, 2020 7:30 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds and Sigma bonds
Replies: 3
Views: 22

Pi bonds and Sigma bonds

Could someone please explain to me the theory behind the pi and sigma bonds? I am really confused about them and I also was wondering how can you define them?
by Samin Kabir
Sun Nov 22, 2020 7:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Axial and Equatorial atoms
Replies: 6
Views: 35

Axial and Equatorial atoms

What are axial and equatorial atoms? How can you identify one of them in an example?
by Samin Kabir
Sun Nov 15, 2020 3:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 format?
Replies: 9
Views: 98

Midterm 2 format?

Is the midterm going to be harder than the last? Also is it going to be multiple choice?
by Samin Kabir
Sun Nov 15, 2020 3:28 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 9
Views: 85

Electronegativity

So are atoms more electronegative going from left to right because they get closer and closer to filling the octet, so the pull is stronger? What about when you go down a group what is the reasoning for why electronegativity decreases.
by Samin Kabir
Sat Nov 14, 2020 3:41 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 18
Views: 113

Electronegativity

How can you calculate the electronegativity of an atom? For some of the textbook problems they are expecting you to know it....
by Samin Kabir
Sat Nov 14, 2020 1:45 pm
Forum: Lewis Acids & Bases
Topic: Lewis acids and Bases
Replies: 6
Views: 43

Lewis acids and Bases

What are the properties of Lewis acids and Bases, respectively?
by Samin Kabir
Sat Nov 14, 2020 1:44 pm
Forum: Dipole Moments
Topic: Sapling #19
Replies: 12
Views: 99

Re: Sapling #19

Yea I agree with what is written above. The dipole-dipole interaction gives O a partial negative and S a partial positive charge. So because of that the interaction u see above is dipole dipole. Normally all polar molecules that are not ionic nor hydrogen bonds are dipole dipole
by Samin Kabir
Sat Nov 14, 2020 1:40 pm
Forum: Student Social/Study Group
Topic: VSEPR Chart
Replies: 3
Views: 35

Re: VSEPR Chart

What about for polyatomic ions? Are we also expected to memorize it as well. If so, can someone give me a list or an easier to derive the formula for a polyatomic ion?
by Samin Kabir
Mon Nov 09, 2020 3:42 pm
Forum: Student Social/Study Group
Topic: Discord/Group me
Replies: 3
Views: 26

Re: Discord/Group me

Thanks!
by Samin Kabir
Mon Nov 09, 2020 3:40 pm
Forum: Octet Exceptions
Topic: Expanded Octets
Replies: 3
Views: 56

Expanded Octets

Are there any elements that tend to use the f orbital when bonded kinda like Phosphorous and the d orbital?
by Samin Kabir
Mon Nov 09, 2020 3:39 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 3
Views: 42

Polarity

How do you determine polarity of a molecule. Specifically what value would be considered polar or non polar?
by Samin Kabir
Mon Nov 09, 2020 3:37 pm
Forum: Student Social/Study Group
Topic: VSEPR Chart
Replies: 3
Views: 35

VSEPR Chart

Are we going to be given a Vsepr chart for our midterms and final? Or are we expected to just memorize it
by Samin Kabir
Mon Nov 09, 2020 3:36 pm
Forum: Student Social/Study Group
Topic: Discord/Group me
Replies: 3
Views: 26

Discord/Group me

Is there a discord or a group me for Chem 14A
by Samin Kabir
Sat Nov 07, 2020 3:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground state electron configuration
Replies: 2
Views: 16

Ground state electron configuration

What is a formal definition of this? And what would be the ground state electron of an ion and how would it be different compared the neutral state of an atom
by Samin Kabir
Sat Nov 07, 2020 3:24 pm
Forum: Lewis Structures
Topic: Bond Character
Replies: 6
Views: 84

Bond Character

What is bond character and how do you determine whether it is ample or overwhelming?
by Samin Kabir
Thu Nov 05, 2020 2:43 pm
Forum: Resonance Structures
Topic: Delocalized Electrons
Replies: 5
Views: 25

Re: Delocalized Electrons

Also another question, why is it that the more delocalized the electrons are, the more stable? Is this for all lewis structures or just the ones with resonance
by Samin Kabir
Thu Nov 05, 2020 2:40 pm
Forum: Resonance Structures
Topic: Delocalized Electrons
Replies: 5
Views: 25

Delocalized Electrons

What does it mean for electrons to be delocalized? Are certain lewis structures resonance structures because of these delocalized electrons? Im also having a hard time visually understanding this concept.
by Samin Kabir
Mon Nov 02, 2020 1:10 am
Forum: Properties of Light
Topic: Fireworks and Sun example
Replies: 3
Views: 38

Re: Fireworks and Sun example

Thanks this means a lot!
by Samin Kabir
Mon Nov 02, 2020 1:10 am
Forum: Properties of Electrons
Topic: Spectral Lines
Replies: 7
Views: 90

Re: Spectral Lines

Thanks everyone this means a lot!
by Samin Kabir
Mon Nov 02, 2020 1:09 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8831
Views: 1496799

Re: Post All Chemistry Jokes Here

Not the best thing in the world but here ya go
Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe
by Samin Kabir
Mon Nov 02, 2020 1:05 am
Forum: Empirical & Molecular Formulas
Topic: Review for Midterm
Replies: 11
Views: 156

Re: Review for Midterm

When do we get the midterms back?
by Samin Kabir
Mon Nov 02, 2020 1:04 am
Forum: Student Social/Study Group
Topic: Halloween!!!
Replies: 54
Views: 351

Re: Halloween!!!

Happy Halloween!
by Samin Kabir
Mon Oct 26, 2020 11:29 pm
Forum: Empirical & Molecular Formulas
Topic: Review for Midterm
Replies: 11
Views: 156

Re: Review for Midterm

Yea because you were expected to have already learned most of the strong bases, strong acids and the polyatomic ions. I personally think that if you know those your golden for the midterm (although I haven't really taken it yet)....I could be wrong about this.
by Samin Kabir
Sat Oct 24, 2020 7:38 pm
Forum: Balancing Chemical Reactions
Topic: combustion
Replies: 4
Views: 57

combustion

Why do we have to include the delta sign above the arrow on only combustion rxns?
by Samin Kabir
Sat Oct 24, 2020 7:37 pm
Forum: Balancing Chemical Reactions
Topic: States of matter in chem equations
Replies: 13
Views: 148

States of matter in chem equations

Hello,
When we have to balance chem equations do we have to include the states of matter in all components. Additionally how do we know what state of matter a reactant/product is in?
by Samin Kabir
Sat Oct 24, 2020 7:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 12
Views: 95

Re: Midterm Format

I also had a question... IS it gonna be curved?
by Samin Kabir
Sat Oct 24, 2020 7:32 pm
Forum: Student Social/Study Group
Topic: Chem Community Questions
Replies: 6
Views: 74

Chem Community Questions

When are these chem community questions due? Is it at the end of every week (on Saturday) ?
by Samin Kabir
Sat Oct 24, 2020 7:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Questions on midterm
Replies: 7
Views: 41

Re: Questions on midterm

They also said that it would be reasonable enough to answer within the 50 minute discussion section we have. I was also told that they would also mirror a lot of the questions from the textbook and the homework.
by Samin Kabir
Sat Oct 17, 2020 4:44 pm
Forum: Properties of Light
Topic: 1b exercise 4
Replies: 2
Views: 15

Re: 1b exercise 4

@Neel Sharma 1G Yea thanks that does help and I just saw the lecture!
by Samin Kabir
Fri Oct 16, 2020 7:56 pm
Forum: Properties of Light
Topic: 1b exercise 4
Replies: 2
Views: 15

1b exercise 4

Can someone help me with this: 1B.4 From the following list of observations, select the one that best supports the idea that particles have wave properties. Explain your reasoning. (a) Scattering of α particles by gold foil. (b) Electron diffraction. (c) Cathode rays. (d) The photoelectric effect. T...
by Samin Kabir
Fri Oct 16, 2020 7:51 pm
Forum: Properties of Light
Topic: Wave particle duality
Replies: 4
Views: 20

Wave particle duality

I know that light can act as a particle because of the photoelectric effect, but what are some examples where it acts as a wave?
by Samin Kabir
Fri Oct 16, 2020 7:49 pm
Forum: Properties of Electrons
Topic: Energy Levels
Replies: 4
Views: 34

Energy Levels

Hi,
Do electrons ever skip energy levels. For example, can an electron go from n =1 to n=5 all in one step or does it have to go to n=2, n=3, n=4 before getting on the n=5 and also when the electron comes back down does it have also go down serially. Is this also how you would find spectral lines?
by Samin Kabir
Fri Oct 16, 2020 7:46 pm
Forum: Properties of Electrons
Topic: Spectral Lines
Replies: 7
Views: 90

Spectral Lines

Did he cover how to find spectral lines yet? If so, how would you calculate number of spectral lines? Would it be n-1 or something like that?
by Samin Kabir
Fri Oct 16, 2020 7:45 pm
Forum: Properties of Electrons
Topic: Sapling Homework
Replies: 4
Views: 52

Sapling Homework

Hi,
Is the sapling homework that was originally due next Sunday(week 3) now moved to week 4? Because he said something about adding more questions to cover weeks 2,3 and 4.
Thanks
by Samin Kabir
Fri Oct 09, 2020 11:36 pm
Forum: Significant Figures
Topic: Significant Figures
Replies: 4
Views: 70

Significant Figures

For exams, do we just do all calculations as it is without rounding and then round our final answer to the nearest sigfig?
by Samin Kabir
Fri Oct 09, 2020 11:34 pm
Forum: Empirical & Molecular Formulas
Topic: Chapter M Exercise 13
Replies: 1
Views: 42

Chapter M Exercise 13

Is there an easier way to solve this problem than how it is solved on the solutions manual: Polychlorinated biphenyls (PCBs) were once widely used industrial chemicals but were found to pose a risk to health and the environment. PCBs contain only carbon, hydrogen, and chlorine. Aroclor 1254 is the t...
by Samin Kabir
Fri Oct 09, 2020 11:31 pm
Forum: Empirical & Molecular Formulas
Topic: Chapter M Exercise 19
Replies: 4
Views: 35

Chapter M Exercise 19

Can someone explain step by step how to do this problem:M.19 A stimulant in coffee and tea is caffeine, a substance of molar mass 194g/mol. When 0.376 g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogen were formed. Determine the empirical and molecular for...
by Samin Kabir
Fri Oct 09, 2020 11:27 pm
Forum: Properties of Light
Topic: Electromagnetic fields
Replies: 1
Views: 21

Electromagnetic fields

Also in today's lecture the professor also mentioned something about how molecule shape depends on its electron density. Can someone explain how it is dependent on electron density?
by Samin Kabir
Fri Oct 09, 2020 11:24 pm
Forum: Properties of Light
Topic: Fireworks and Sun example
Replies: 3
Views: 38

Fireworks and Sun example

So in the beginning of the professor's lecture he talk about some examples of how excited electrons can emit light using the fireworks and the sun example. When he was talking about how they display a specific color (like green, red, orange, etc), I got a bit confused. How do they get the color they...

Go to advanced search