Search found 54 matches

by JohannaPerezH2F
Mon Jan 13, 2020 4:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: volume change with inert gas
Replies: 9
Views: 29

Re: volume change with inert gas

the reaction does not shift (concentration does not change) with an inert gas because in order to do so we would need volume to change.
by JohannaPerezH2F
Mon Jan 13, 2020 4:56 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: PV=nRT
Replies: 9
Views: 21

Re: PV=nRT

this is the ideal gas law and you can use it to convert between partial pressure and concentration. concentration=P/RT
by JohannaPerezH2F
Mon Jan 13, 2020 4:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: What is this?
Replies: 21
Views: 98

Re: What is this?

in basic terms, le chanteliers principle just demonstrates how a system will always reach stability but more complex "Le Chatelier's principle can be used to predict the behavior of a system due to changes in pressure, temperature, or concentration. Le Chatelier's principle implies that the add...
by JohannaPerezH2F
Mon Jan 13, 2020 4:51 pm
Forum: Administrative Questions and Class Announcements
Topic: 14A Final Pickup
Replies: 5
Views: 28

Re: 14A Final Pickup

you can pick them up week 3 from 3034 Young Hall
by JohannaPerezH2F
Mon Jan 13, 2020 4:51 pm
Forum: Administrative Questions and Class Announcements
Topic: 14A Final Pickup
Replies: 5
Views: 28

Re: 14A Final Pickup

you can pick them up week 3 from 3034 Young Hall
by JohannaPerezH2F
Mon Jan 13, 2020 4:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Are Lectures Bruincasted?
Replies: 9
Views: 40

Re: Are Lectures Bruincasted?

I also have this question, so I'm just dropping a comment to be able to access it once someone replies
by JohannaPerezH2F
Sun Jan 12, 2020 2:54 pm
Forum: Ideal Gases
Topic: R in PV=nRT
Replies: 34
Views: 350

Re: R in PV=nRT

R is the gas constant and it equals 8.314 J / mol·K.
by JohannaPerezH2F
Sun Jan 12, 2020 2:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1
Replies: 2
Views: 14

Re: Test 1

I think Test 1 is only on outline 1 which would be chemical equilibrium but he'll probably clarify this by the end of this week
by JohannaPerezH2F
Sun Jan 12, 2020 2:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: when to use Kc vs Kp
Replies: 11
Views: 32

Re: when to use Kc vs Kp

we use Kc or Kp according to the the information we are given and the values we are looking for. for example we would use Kp when atm is used and Kc when moles/liter are used
by JohannaPerezH2F
Sun Jan 12, 2020 2:49 pm
Forum: Administrative Questions and Class Announcements
Topic: General HW question
Replies: 9
Views: 26

Re: General HW question

i think this might depend on your ta, but for some, it mostly based on completeness of the 5 problems.
by JohannaPerezH2F
Sun Jan 12, 2020 2:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: x is small approximation
Replies: 6
Views: 26

Re: x is small approximation

according to the video module, we can assume K is small when it is approximate 10^-4 or smaller
by JohannaPerezH2F
Sun Jan 12, 2020 2:47 pm
Forum: Administrative Questions and Class Announcements
Topic: HW 2
Replies: 7
Views: 22

Re: HW 2

Yes, he said week 1 that we can still turn in equilibrium hw problems for week 2 hw.
by JohannaPerezH2F
Mon Dec 02, 2019 9:44 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Today's lecture
Replies: 5
Views: 40

Today's lecture

Hi, I was unable to make it to lecture, can someone let me know what Lavelle went over please and thank you!
by JohannaPerezH2F
Mon Dec 02, 2019 9:41 pm
Forum: Student Social/Study Group
Topic: Practice Final
Replies: 17
Views: 228

Re: Practice Final

I'm not sure if he will, but I know Friday 7:30-10 there will be a review session which will cover everything
by JohannaPerezH2F
Mon Dec 02, 2019 9:39 pm
Forum: Bronsted Acids & Bases
Topic: stronger acid ?
Replies: 3
Views: 25

Re: stronger acid ?

In both acid the oxidation number of chlorine and bromine are same ,that is +3 . But chlorine atom is more electronegative than bromine atom . So the electron of O - H bond strongly attract Cl atom towards itself than bromine atom . ... Consequently , HClO2 is more stroger acid than HBrO2
by JohannaPerezH2F
Mon Dec 02, 2019 9:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades
Replies: 15
Views: 131

Re: Grades

yes, to receive a C- we just need a total of 250 points
by JohannaPerezH2F
Mon Dec 02, 2019 9:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Location
Replies: 11
Views: 70

Re: Final Exam Location

You will go according to your last name but we'll probably receive an email with a confirmation
by JohannaPerezH2F
Sun Dec 01, 2019 11:00 pm
Forum: General Science Questions
Topic: Review Sessions for Final
Replies: 7
Views: 72

Re: Review Sessions for Final

I just checked chemistry community but they are not up yet, he said they ould be up very soon. I believe the first one begins on Tuesday
by JohannaPerezH2F
Sun Dec 01, 2019 10:57 pm
Forum: General Science Questions
Topic: test taking nervousness
Replies: 19
Views: 148

Re: test taking nervousness

This also happen to me a lot. I usually sit and take a deep breathe and really tell myself that I know what I'm doing. By giving myself reassurance I'm able to more easily focus on the problems
by JohannaPerezH2F
Sun Dec 01, 2019 10:54 pm
Forum: General Science Questions
Topic: Friday Lecture Week 10
Replies: 3
Views: 28

Re: Friday Lecture Week 10

I would say that Friday will be review
by JohannaPerezH2F
Sun Dec 01, 2019 10:53 pm
Forum: Bronsted Acids & Bases
Topic: How to determine if a molecule is a bronsted acid or base?
Replies: 3
Views: 23

Re: How to determine if a molecule is a bronsted acid or base?

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrog...
by JohannaPerezH2F
Sun Dec 01, 2019 10:52 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 15
Views: 95

Re: Sigma vs. Pi

sigma bonds will be stronger since its an overlap
by JohannaPerezH2F
Sun Nov 24, 2019 10:10 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 8
Views: 40

Re: Cisplatin

I got this online and hope it answers your question. "Cisplatin molecules are known to be attacked by water molecules before they react with DNA. ... 3) When cis-form of (NH3)2 Pt 2+ reacts with two Guanines in DNA, the two N atoms in Guanines can readily bind to the Pt atom in cisplatin. The t...
by JohannaPerezH2F
Sun Nov 24, 2019 10:07 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating complexes
Replies: 1
Views: 15

Re: Chelating complexes

I got this from online and thought it was a good explanation. "A chelate is a chemical compound composed of a metal ion and a chelating agent. A chelating agent is a substance whose molecules can form several bonds to a single metal ion. In other words, a chelating agent is a multidentate ligan...
by JohannaPerezH2F
Sun Nov 24, 2019 10:05 pm
Forum: Naming
Topic: Trans and Cis
Replies: 8
Views: 47

Re: Trans and Cis

yes, and it would by looking at where the isomer is. the isomer where the two methyl groups are on the same side of the double bond is called “cis”, and the isomer where the two methyl groups are on the opposite side is called “trans”.
by JohannaPerezH2F
Sun Nov 24, 2019 10:03 pm
Forum: General Science Questions
Topic: Week 9 HW
Replies: 6
Views: 55

Re: Week 9 HW

I would do week 9 based on hybridization and prolly the coordination and compound one
by JohannaPerezH2F
Sun Nov 24, 2019 10:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hybridization
Replies: 7
Views: 33

Re: Hybridization

Hybridization is based on the mixing of orbitals of the atom(any) to give hybrid orbitals. Hybrid orbitals can overlap with the hybrid/pure orbitals of other atoms to give sigma bonds
by JohannaPerezH2F
Sun Nov 17, 2019 11:02 pm
Forum: Student Social/Study Group
Topic: Test 2
Replies: 11
Views: 48

Re: Test 2

you should focus on intermolecular forces, vsper model, hydrogen bonding dipoles and whatever he'll add Monday
by JohannaPerezH2F
Sun Nov 17, 2019 10:59 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 7
Views: 56

Re: test 2

I go over one for a while and then do something random and then go back and see if I can remember without looking at something
by JohannaPerezH2F
Sun Nov 17, 2019 10:58 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 35
Views: 485

Re: Class Grading

it's not on a curve but if in total points you accumulate 250 points or more then you have a passing grade
by JohannaPerezH2F
Sun Nov 17, 2019 10:56 pm
Forum: Student Social/Study Group
Topic: What will Test 2 be on?
Replies: 8
Views: 45

Re: What will Test 2 be on?

you should focus on intermolecular forces, vsper model, hydrogen bonding dipoles and whatever he'll add Monday
by JohannaPerezH2F
Sun Nov 17, 2019 10:54 pm
Forum: Ionic & Covalent Bonds
Topic: 2D 3.
Replies: 1
Views: 21

Re: 2D 3.

you would know this because the electronegativity difference is greater than Ba and Br than between B and Be and Br making the Ba-Br bond more ionic
by JohannaPerezH2F
Sun Nov 03, 2019 11:13 pm
Forum: Resonance Structures
Topic: 2B.15
Replies: 2
Views: 34

Re: 2B.15

so you would draw the structure with n in the center and surround with 2 o's and one cl and one o will have two bonds and the other two just one bond with N
by JohannaPerezH2F
Sun Nov 03, 2019 11:10 pm
Forum: General Science Questions
Topic: Study Tactics
Replies: 5
Views: 64

Re: Study Tactics

I feel like focus more of your time on quantum
by JohannaPerezH2F
Sun Nov 03, 2019 11:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Showing Work
Replies: 6
Views: 42

Re: Showing Work

my ta said that if you just write the answer then thats fine but they give partial points so if you don't know something you can write random equations to get some credit
by JohannaPerezH2F
Sun Nov 03, 2019 11:07 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 7
Views: 62

Re: Octet Exceptions

the octet rule is strictly followed by B row and as you go down not that much, an example would be PBr5
by JohannaPerezH2F
Sun Nov 03, 2019 11:05 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 2
Views: 43

Re: Drawing Resonance Structures

yea, i think you'll just have to draw one with the correct charge since you can rotate the bonds
by JohannaPerezH2F
Tue Oct 29, 2019 7:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 7
Views: 55

Midterm

Can someone confirm that the midterm is Nov 6 and what time and place is takes? Or where can I access this information
by JohannaPerezH2F
Sun Oct 20, 2019 11:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 499

Re: Advice for studying

I've also been struggling a lot with keeping up with the material, so if anyone wants to study together and prepare lemme know but I think something that is definitely important is to prepare before the week starts
by JohannaPerezH2F
Sun Oct 20, 2019 11:12 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 233

Re: What are the units of hertz

The units for hertz is one cycle per second
by JohannaPerezH2F
Sun Oct 20, 2019 11:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1F.3
Replies: 2
Views: 28

Re: 1F.3

p^3->s^2->cl^-
by JohannaPerezH2F
Sun Oct 20, 2019 11:07 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.17
Replies: 2
Views: 38

Re: 1E.17

a)4p
b)4s
c)6s
by JohannaPerezH2F
Mon Oct 14, 2019 4:44 pm
Forum: *Shrodinger Equation
Topic: psi vs psi^2
Replies: 7
Views: 79

psi vs psi^2

Hi can someone further explain the difference between psi and psi^2?
by JohannaPerezH2F
Sun Oct 13, 2019 10:53 pm
Forum: Properties of Light
Topic: 1A.3
Replies: 2
Views: 26

Re: 1A.3

so C would be interpreted as the following

because the electrical field corresponds to the amplitude; and so as the frequency decreases the waves broaden and the extent of the change decreases.
by JohannaPerezH2F
Sun Oct 13, 2019 10:47 pm
Forum: Properties of Light
Topic: 1A.3
Replies: 1
Views: 25

Re: 1A.3

C is correct because the electrical field corresponds to the amplitude; and so as the frequency decreases the waves broaden and the extent of the change decreases.
by JohannaPerezH2F
Sun Oct 13, 2019 10:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: #1D.21
Replies: 2
Views: 27

Re: #1D.21

a) 5d, five
b)1s, one
c) 6f, seven
d) 2p, three
by JohannaPerezH2F
Sun Oct 13, 2019 10:42 pm
Forum: Properties of Light
Topic: Balmer vs. Lyman Lines (1A.11)
Replies: 3
Views: 25

Re: Balmer vs. Lyman Lines (1A.11)

In each of these series, the principal quantum number for the lower energy number involved is the same for each absorption line. Thus, for the Lyman series, the lower energy level is n=1; for the Balmer series n=2 for Paschen series n=3 and for the Brackett series n=4.
by JohannaPerezH2F
Sun Oct 13, 2019 10:38 pm
Forum: Properties of Light
Topic: Combining Different Equations
Replies: 8
Views: 60

Re: Combining Different Equations

We are allowed to combine equations when they are equal to each other. For example x=2 for x+2=? it would be 2+2=4 because we substitute the variable for the known. This also happens for the equation you listed. Hopefully, this is what you are referring to
by JohannaPerezH2F
Sun Oct 06, 2019 9:54 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 95
Views: 19660

Re: Final Jitters

Usually to calm myself, I like to do something that is fun for me. Either that be I watch a show or go to the gym just to get a breather and forget about all the anxieties. Goodluck
by JohannaPerezH2F
Sun Oct 06, 2019 9:52 pm
Forum: General Science Questions
Topic: Periodic Table
Replies: 5
Views: 66

Re: Periodic Table

I might be completely wrong so anyone correct me if I'm wrong but it might be the number of isotopes that exists?
by JohannaPerezH2F
Sun Oct 06, 2019 9:52 pm
Forum: General Science Questions
Topic: Periodic Table
Replies: 5
Views: 66

Re: Periodic Table

I might be completely wrong so anyone correct me if I'm wrong but it might be the number of isotopes that exists?
by JohannaPerezH2F
Sun Oct 06, 2019 9:47 pm
Forum: Properties of Light
Topic: Question 1A.3
Replies: 1
Views: 36

Re: Question 1A.3

I'm not sure if I misinterpreted your post but for your explanation it would be that as frequency decreases then the waves broaden and the extent of the change decreases. This is because electric field corresponds to the amplitude
by JohannaPerezH2F
Sun Oct 06, 2019 9:40 pm
Forum: Molarity, Solutions, Dilutions
Topic: G7
Replies: 2
Views: 29

Re: G7

Yes so afterwards what you would do is find the mass of water by subtracting 510g-27.8g= 482.2G H2O

and the way to describe it would be that you measure 482g H2O on a balance and then pour it in a beaker. Then you weigh 27.8g of KNO3 and mix it with water until it dissolves.
by JohannaPerezH2F
Sun Oct 06, 2019 4:49 pm
Forum: SI Units, Unit Conversions
Topic: 50 Min test
Replies: 4
Views: 47

50 Min test

I'm barley learning how to navigate Chemistry community so sorry if this post is not in the correct place buy anyways..

For the 50 min test will it take place during class (if so when) or during our discussion section??

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