Search found 52 matches

by Jocelyne Milke 1G
Sun Feb 10, 2019 9:42 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm #1 14B
Replies: 12
Views: 102

Re: Midterm #1 14B

I think he will post the solutions after the session but they probably won't be detailed so I would recommend going to the review session if you can
by Jocelyne Milke 1G
Sun Feb 10, 2019 9:32 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 107
Views: 2381

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Does anyone have the notes from her last session (feb. 3) that they could email me?
by Jocelyne Milke 1G
Fri Feb 08, 2019 1:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 8
Views: 69

Re: Midterm

Gibbs free energy won't be on the midterm. Everything we learned up until the part about entropy we discussed today will be
by Jocelyne Milke 1G
Sun Feb 03, 2019 3:08 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 8.31 Sixth Edition
Replies: 2
Views: 21

Re: 8.31 Sixth Edition

The Cv and Cp constants are given on the constant and equations sheet too
by Jocelyne Milke 1G
Sun Feb 03, 2019 2:35 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy Formation of an element
Replies: 4
Views: 19

Re: Standard Enthalpy Formation of an element

The element is already in its most stable form so the standard enthalpy of formation is zero
by Jocelyne Milke 1G
Sun Feb 03, 2019 2:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Review
Replies: 14
Views: 79

Re: Midterm Review

Samantha Silva 1F wrote:Will the TA’s hold a separate review?

I think it depends on the TA but some of the UA's hold review sessions
by Jocelyne Milke 1G
Tue Jan 29, 2019 1:09 am
Forum: Student Social/Study Group
Topic: Jan 25 lecture notes
Replies: 3
Views: 72

Re: Jan 25 lecture notes

Natalie Liu 4I wrote:yes! Thank you so much!

Here you go!
by Jocelyne Milke 1G
Sun Jan 27, 2019 9:40 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Cancelling Out with Hess's Method
Replies: 3
Views: 24

Re: Cancelling Out with Hess's Method

You can only cancel things out when you have the same compound on the reactants side and the products side.
by Jocelyne Milke 1G
Sun Jan 27, 2019 9:33 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Preferable Method?
Replies: 3
Views: 14

Re: Preferable Method?

I think it also depends on what information is given in the problem so one method might be easier to use for a specific problem.
by Jocelyne Milke 1G
Sun Jan 27, 2019 9:31 pm
Forum: Student Social/Study Group
Topic: Jan 25 lecture notes
Replies: 3
Views: 72

Re: Jan 25 lecture notes

Natalie Liu 4I wrote:Hi,
Does anyone have notes from last Friday's lecture?

I have the notes, do you still need them?
by Jocelyne Milke 1G
Mon Jan 21, 2019 7:52 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 107
Views: 2381

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Amy Dinh 1A wrote:On #4a Worksheet 2, I keep getting pH=4.40, while the answer key says 4.30, when both using the quadratic formula and the shortcut way. I don't understand how to get the answer to

in the session she said the pH was 4.40 so you are correct.
by Jocelyne Milke 1G
Thu Jan 17, 2019 9:48 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: sigfigs for acids/bases
Replies: 3
Views: 22

Re: sigfigs for acids/bases

also sig figs for pH count after the decimal.
by Jocelyne Milke 1G
Thu Jan 17, 2019 8:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 16641

Re: Number of questions on test one [ENDORSED]

I was wondering how many questions test one has? I was also wondering how many points will be taken off for simple mistakes (sig figs, units, etc.)? When will the test take place? Does it cover both equilibrium and acids and bases? It takes place in your discussion section next week and both equili...
by Jocelyne Milke 1G
Thu Jan 17, 2019 8:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and liquids in K
Replies: 6
Views: 30

Re: Solids and liquids in K

You don't include liquids in your equilibrium expressions because they occur in such large amounts that they are considered the solvents of the chemical reaction. Any reaction that occurs using a liquid will not provide a large enough change to that liquids concentration so as to require us to incl...
by Jocelyne Milke 1G
Thu Jan 17, 2019 8:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Weak and Strong Acids and Bases [ENDORSED]
Replies: 2
Views: 23

Re: Weak and Strong Acids and Bases [ENDORSED]

You can memorize the strong acids and bases. Strong acids and bases are completely dissociated. If there is a small Kb or Ka value then it is probably a weak acid or base.
by Jocelyne Milke 1G
Sat Jan 12, 2019 5:25 pm
Forum: General Science Questions
Topic: Week 1 Homework
Replies: 5
Views: 40

Re: Week 1 Homework

Homework is due in discussion for the rest of the quarter
by Jocelyne Milke 1G
Fri Jan 11, 2019 3:22 pm
Forum: Ideal Gases
Topic: What does K represent?
Replies: 9
Views: 33

Re: What does K represent?

LeannaPhan14BDis1D wrote:K is a constant but it is supposed to stay the same regardless of the different P/R right?

Yes! I believe changing the concentrations of the reactants or products does not change K
by Jocelyne Milke 1G
Sat Dec 08, 2018 2:07 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 1
Views: 25

Re: Ionic vs Covalent

I'm not sure about the second part but the first part is correct. In my notes I also have that if the electronegativity difference is greater than 2 it is ionic and if it is less than 1.5 it is covalent.
by Jocelyne Milke 1G
Sat Dec 08, 2018 1:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: ClO2+
Replies: 4
Views: 47

Re: ClO2+

O shouldn't have a +1 since it is more electronegative than Cl
by Jocelyne Milke 1G
Sat Dec 08, 2018 1:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape
Replies: 5
Views: 44

Re: Shape

I think he would clarify which one he wants us to answer but we most likely will be doing molecular geometry
by Jocelyne Milke 1G
Sun Dec 02, 2018 5:00 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 3
Views: 45

Re: Polydentate

Ricky Ma DIS 4I wrote:What does polydentate mean and how do I know which ligands can be polydentate?

Polydentate means that the ligand has more than one atom bonded to it.
by Jocelyne Milke 1G
Sun Dec 02, 2018 4:51 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength of an acid
Replies: 14
Views: 389

Re: Strength of an acid

The more electronegative an atom, the more willing it is to hold onto the electrons left over when the Hydrogen leaves the molecule.
by Jocelyne Milke 1G
Sun Dec 02, 2018 4:09 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compounds
Replies: 5
Views: 57

Re: Amphoteric Compounds

Some of them include BeO, Al2O3, Ga2O3, SnO2 & PbO2. They have characteristics in between metal oxides and nonmetal oxides
by Jocelyne Milke 1G
Sat Nov 24, 2018 7:52 pm
Forum: Electronegativity
Topic: regions of e- density
Replies: 3
Views: 52

Re: regions of e- density

to add on, you're combining 1 s orbital with 3 p orbitals
by Jocelyne Milke 1G
Sat Nov 24, 2018 7:31 pm
Forum: Dipole Moments
Topic: Chemistry Community
Replies: 2
Views: 29

Re: Chemistry Community

You can check which posts you've commented on by clicking on "quick links" in the upper left and clicking "your posts"
by Jocelyne Milke 1G
Sat Nov 24, 2018 7:14 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: on test? [ENDORSED]
Replies: 3
Views: 95

Re: on test? [ENDORSED]

His announcement says that the end of bonding and all of molecular shapes will be on test 3
by Jocelyne Milke 1G
Fri Nov 16, 2018 7:36 pm
Forum: Quantum Numbers and The H-Atom
Topic: degeneracy of the a 4p orbital
Replies: 9
Views: 139

Re: degeneracy of the a 4p orbital

So we are not taking into account the spin of the electrons? I thought that the energy of an electron did not change if the electron had spin up or down. So for a 4p orbital, would we not have: n=4, l=1, m_l=1,0,-1 and m_s = +1/2,-1/2; a total degeneracy of 6? This would be the total number of elec...
by Jocelyne Milke 1G
Fri Nov 16, 2018 7:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: number of different molecular shapes
Replies: 3
Views: 37

Re: number of different molecular shapes

I think there's 11 total (page 109 in the 6th edition) that we have to know along with the bond angles.
by Jocelyne Milke 1G
Fri Nov 16, 2018 7:11 pm
Forum: Sigma & Pi Bonds
Topic: Differences in energy
Replies: 5
Views: 80

Re: Differences in energy

LorenzoDuvergne3I wrote:Where in the textbook did you find information about sigma and pi bonds? I don't think we've covered them in lecture yet

Sigma and Pi bonds are talked about on page 120 of the 6th edition. (Chapter 4)
by Jocelyne Milke 1G
Sun Nov 11, 2018 10:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm [ENDORSED]
Replies: 14
Views: 253

Re: Midterm [ENDORSED]

405021651 wrote:Someone on a different post mentioned that it was on the week of November 19th and week 9 which is not making any sense now.

He moved it to week 9 starting Tuesday, November 27. The test schedule can be found on his website
by Jocelyne Milke 1G
Sun Nov 11, 2018 11:28 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: Hydrogen Bonding [ENDORSED]
Replies: 3
Views: 42

Re: Hydrogen Bonding [ENDORSED]

I think it is stronger than other intermolecular forces but weak when compared to covalent and ionic bonds
by Jocelyne Milke 1G
Sun Nov 11, 2018 12:24 am
Forum: Determining Molecular Shape (VSEPR)
Topic: molecular shape
Replies: 3
Views: 90

Re: molecular shape

I think we also need to know the bond angles associated with the molecular shapes
by Jocelyne Milke 1G
Sat Nov 10, 2018 11:59 pm
Forum: Bond Lengths & Energies
Topic: Molecular Shapes
Replies: 2
Views: 52

Re: Molecular Shapes

Other molecular shapes are shown in Figure 4.1 on page 109 (6th edition) and they include the bond angles.
by Jocelyne Milke 1G
Sat Nov 10, 2018 6:15 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability v. Electronegativity
Replies: 3
Views: 49

Re: Polarizability v. Electronegativity

Polarizability is how easily electrons are distorted. Bigger molecules have higher polarizability because there are more electrons and they are more easily distorted.
by Jocelyne Milke 1G
Sun Nov 04, 2018 3:20 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 23676

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Joussie Camacho 4I wrote:Has the key been posted for midterm review worksheet #5?

I think it will be posted after the session ends. (It ends at 6)
by Jocelyne Milke 1G
Fri Nov 02, 2018 11:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Section
Replies: 2
Views: 41

Re: Section

I think you would still have discussion section since we only get Thursday and Friday off for Thanksgiving and your discussion is on Tuesday but it might depend on your TA.
by Jocelyne Milke 1G
Fri Nov 02, 2018 10:49 pm
Forum: Lewis Structures
Topic: Do brackets go over cations or anions or either or both?
Replies: 3
Views: 46

Re: Do brackets go over cations or anions or either or both?

I think you put them on both cations and anions
by Jocelyne Milke 1G
Tue Oct 30, 2018 9:36 pm
Forum: Lewis Structures
Topic: Lewis Structures- formal charge
Replies: 4
Views: 73

Re: Lewis Structures- formal charge

You use the equation FC= V-(L+S/2), where FC is the formal charge, V is the number of valence electrons, L is the number of lone pairs, and S is the number of shared electrons.
by Jocelyne Milke 1G
Fri Oct 26, 2018 4:15 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 14
Views: 213

Re: E=hv

The work function is the energy needed to remove an electron.
by Jocelyne Milke 1G
Tue Oct 23, 2018 11:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.23, part c (7th Edition)
Replies: 2
Views: 33

Re: 1D.23, part c (7th Edition)

With n=2 you could have l= 0 or 1. If your l=0, then your ml can only=0 (this is one orbital). Since l can also equal 1, your ml can be -1,0,+1. This corresponds to 3 more orbitals so the total number of orbitals would be 4.
by Jocelyne Milke 1G
Tue Oct 23, 2018 11:02 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 23676

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Can someone explain what the statement in #9 of worksheet 3 means? "It is impossible to determine both the speed and position of an electron with absolute uncertainty." Why is it absolute uncertainty and not absolute certainty? It should be with absolute certainty. She corrected the mista...
by Jocelyne Milke 1G
Sun Oct 21, 2018 12:11 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 23676

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

yast_27 wrote:Hi!

I was wondering if we should sign up for the peer session as i wanted to attend you session tomorrow,

Thank you very much!


I don’t think you need to sign up, I think you can just show up
by Jocelyne Milke 1G
Sun Oct 21, 2018 12:09 pm
Forum: Properties of Light
Topic: Equations
Replies: 6
Views: 62

Re: Equations

Constants are also given on the sheet
by Jocelyne Milke 1G
Thu Oct 18, 2018 10:36 pm
Forum: Einstein Equation
Topic: Values of Each Symbol
Replies: 3
Views: 68

Re: Values of Each Symbol

The constants will be given on the test. You could find the equations and constants given on his website under "Constants and Equations"
by Jocelyne Milke 1G
Thu Oct 18, 2018 10:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Required knowledge for test/midterm [ENDORSED]
Replies: 13
Views: 235

Re: homework [ENDORSED]

505130452 wrote:For the homework, is there homework due when we have tests, or do we turn it in on Friday or the following discussion?

I think you still turn in the homework for the week in your discussion
by Jocelyne Milke 1G
Thu Oct 18, 2018 10:14 pm
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 192

Re: Do I have to memorize the spectrum?

I think you should remember that the wavelength for visible light is between 400 and 700 nanometers and probably know which ones have short wavelengths (like gamma or x rays) and which ones have long wavelengths (like radio or microwaves)
by Jocelyne Milke 1G
Fri Oct 12, 2018 8:58 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 90
Views: 7609

Re: All students read this sig fig post [ENDORSED]

I heard of a rule about keeping different numbers of sig figs depends on doing multiplication or addition. Does someone know about this rule and maybe help me clarify it? Thank you! For addition/subtraction your answer has to be the same as the smallest number of decimal places from the data and wi...
by Jocelyne Milke 1G
Tue Oct 09, 2018 1:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 16641

Re: Number of questions on test one [ENDORSED]

Emma Randolph 3D wrote:How many points will the test be out of?

The syllabus says each test will be worth 40 points.
by Jocelyne Milke 1G
Mon Oct 08, 2018 2:52 pm
Forum: SI Units, Unit Conversions
Topic: Homework for Week 2
Replies: 16
Views: 169

Re: Homework for Week 2

They are on the syllabus and also on the 2nd lecture outline on his website
by Jocelyne Milke 1G
Thu Oct 04, 2018 8:26 pm
Forum: Significant Figures
Topic: Decimal point
Replies: 14
Views: 195

Re: Decimal point

Bianca Barcelo 1G wrote:For these types of values involving leading zeros behind a decimal, (e.g., .041), would you disregard the 0 as a significant figure?

I believe for the example of 0.041 there would be 2 sig figs so the 0 is not a sig fig
by Jocelyne Milke 1G
Thu Oct 04, 2018 8:07 pm
Forum: SI Units, Unit Conversions
Topic: Scientific Notation
Replies: 11
Views: 142

Re: Scientific Notation

somebody else asked this today in my discussion, the TA said you usually put something into scientific notation if the number is 10^-2 or smaller, and make sure you put the correct significant figures! The number of sig figs used in the final answer is determined by the smallest number of sig figs ...
by Jocelyne Milke 1G
Thu Oct 04, 2018 7:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Registering/Creating Your Chemistry Community Account
Replies: 17
Views: 15236

Re: Registering/Creating Your Chemistry Community Account

Isabel Nkd 4D wrote:Can you clarify if its 2 points max. per week or 3 points max. ?


Thank you!


I think in lecture he said it would be 3 points per week.

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