Search found 71 matches
- Fri Mar 15, 2019 9:22 pm
- Forum: Student Social/Study Group
- Topic: Lyndon's Review Session
- Replies: 8
- Views: 1508
Re: Lyndon's Review Session
practice exam name is pork ramen and will be posted tomorrow at 9 am
- Fri Mar 15, 2019 3:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's Review Sheets
- Replies: 9
- Views: 1284
Re: Lyndon's Review Sheets
its pork ramen if anyone else was wondering
- Fri Mar 15, 2019 1:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's Review Sheets
- Replies: 9
- Views: 1284
Re: Lyndon's Review Sheets
does anyone know what is the name of his session?
- Wed Mar 13, 2019 10:28 am
- Forum: Student Social/Study Group
- Topic: Review session
- Replies: 5
- Views: 988
Re: Review session
3-6 in Dodd 147
- Wed Mar 13, 2019 10:27 am
- Forum: Student Social/Study Group
- Topic: Review session
- Replies: 5
- Views: 988
Re: Review session
His is on saturday I believe
- Wed Mar 13, 2019 10:27 am
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 5
- Views: 829
Re: Final
There are many review sessions that have been emailed/ posted, along with many plfs. There are a couple each day leading up to the final.
- Wed Mar 13, 2019 10:26 am
- Forum: General Rate Laws
- Topic: slow step
- Replies: 11
- Views: 1368
Re: slow step
is there a conceptual way to know if an equation is the slow step just by looking at it? Such as if some molecules are known to react together slower?
- Tue Mar 12, 2019 11:11 pm
- Forum: Balancing Redox Reactions
- Topic: balancing water
- Replies: 8
- Views: 747
Re: balancing water
thank you!
- Tue Mar 12, 2019 8:30 pm
- Forum: First Order Reactions
- Topic: Integrated rate law confusion
- Replies: 5
- Views: 457
Re: Integrated rate law confusion
^ I have the same question
- Fri Mar 08, 2019 12:34 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: k & K
- Replies: 18
- Views: 2132
Re: k & K
or are those the same?
- Fri Mar 08, 2019 12:34 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: k & K
- Replies: 18
- Views: 2132
Re: k & K
how do you know when to use it as a Boltzmann's constant or a rate constant?
- Thu Mar 07, 2019 5:53 pm
- Forum: Balancing Redox Reactions
- Topic: balancing water
- Replies: 8
- Views: 747
Re: balancing water
6K.5 in 7th addition, in part a) for the oxygen reaction, water on the right side cancels out and gets removed, leaving only water on the left side. for the bromide reaction, 3H2O is on the left with 6H2O on the right, leaving them on both sides. It seems like you should be able to cancel out the le...
- Thu Mar 07, 2019 3:19 pm
- Forum: Balancing Redox Reactions
- Topic: balancing water
- Replies: 8
- Views: 747
balancing water
I'm not sure exactly how to word this, but when balancing a redox reaction that takes place in a basic solution, water is placed on both sides of the reaction. In the solution manual, sometimes the water is cancelled out, and other times water is kept on both sides of the equation. Is there a reason...
- Wed Mar 06, 2019 9:38 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Instantaneous vs Average
- Replies: 11
- Views: 975
Re: Instantaneous vs Average
average, in terms of reaction rates, is the change in molar concentration during an interval divided by that time interval. Instantaneous is pretty much the same thing but regarding a specific point of interest. So instead of a rate over a period of time, instantaneous is like a snapshot of what the...
- Wed Mar 06, 2019 8:31 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 24
- Views: 2115
Re: Final
got it thank you!
- Wed Mar 06, 2019 6:17 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 24
- Views: 2115
Re: Final
i just checked my email and I didn't receive one with review sessions, is it posted on the website anywhere?
- Wed Mar 06, 2019 11:05 am
- Forum: Administrative Questions and Class Announcements
- Topic: Class Curve
- Replies: 11
- Views: 1719
Re: Class Curve
C- is considered passing I believe. If you get a D+ though you will still get credit from the course but will not be able to move in the series. That was the case for 14A and I would assume it would be similar for this course as well.
- Wed Mar 06, 2019 11:02 am
- Forum: Student Social/Study Group
- Topic: test 1
- Replies: 10
- Views: 1118
Re: test 1
thanks!
- Wed Mar 06, 2019 11:02 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: equations for q
- Replies: 9
- Views: 839
Re: equations for q
thanks!
- Sun Mar 03, 2019 9:46 pm
- Forum: Student Social/Study Group
- Topic: Week 8
- Replies: 2
- Views: 533
Re: Week 8
That's perfect thank you so much
- Sun Mar 03, 2019 7:12 pm
- Forum: Student Social/Study Group
- Topic: Week 8
- Replies: 2
- Views: 533
Week 8
I was out of the state this week and was not able to attend lecture. Could someone tell me how much of the outline has been gone over in lecture so I can read to where we are? Thank you!
- Sun Mar 03, 2019 7:09 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 24
- Views: 2115
Re: Final
He usually will announce all of the new review sessions before week ten
- Sun Mar 03, 2019 7:06 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Remembering Equations
- Replies: 5
- Views: 442
Re: Remembering Equations
Thank you!
- Sun Mar 03, 2019 7:06 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: equations for q
- Replies: 9
- Views: 839
Re: equations for q
Makes sense now, thank you!
- Sun Feb 17, 2019 8:53 pm
- Forum: Student Social/Study Group
- Topic: absent 2/15
- Replies: 3
- Views: 388
Re: absent 2/15
Great thank you!
- Sun Feb 17, 2019 7:45 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Remembering Equations
- Replies: 5
- Views: 442
Remembering Equations
Does anyone have any helpful hints or tips on remembering all of the different equations? I know we are given many equations when we take exams, but I was just wondering if anyone has a way that has helped them remember equations that we are not given.
- Sun Feb 17, 2019 7:42 pm
- Forum: Student Social/Study Group
- Topic: absent 2/15
- Replies: 3
- Views: 388
absent 2/15
Hi, I was absent on Friday (2/15) due to a swim meet, and I would really appreciate if someone could post a photo of their notes, or tell me what topics were covered during lecture. Were there any announcements made during class? Thanks!
- Sun Feb 10, 2019 7:14 pm
- Forum: Student Social/Study Group
- Topic: midterm/homework
- Replies: 2
- Views: 320
Re: midterm/homework
Thank you!
- Sun Feb 10, 2019 7:14 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: equations for q
- Replies: 9
- Views: 839
Re: equations for q
Thank you!
- Sun Feb 10, 2019 5:05 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: equations for q
- Replies: 9
- Views: 839
equations for q
How do you know when to use q=nC(delta)T , q=mCdeltaT or just q=C(delta)T
- Sat Feb 09, 2019 10:03 pm
- Forum: Student Social/Study Group
- Topic: midterm/homework
- Replies: 2
- Views: 320
midterm/homework
On the website, it states that the midterm covers Chemical Equilibrium, Acid and Base Equilibria, Thermochemistry, Thermodynamics to the end of entropy. Does anyone know in terms of homework problems where to study to? Preferably for the 7th addition?
- Sun Feb 03, 2019 10:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q(cal)= -q
- Replies: 2
- Views: 715
Re: q(cal)= -q
thank you!
- Sun Feb 03, 2019 10:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: death in biological systems
- Replies: 5
- Views: 463
Re: death in biological systems
Thank you all!
- Sun Feb 03, 2019 10:54 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Cp/Cv formulas
- Replies: 2
- Views: 278
Re: Cp/Cv formulas
Thank you!
- Wed Jan 30, 2019 5:14 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Cp/Cv formulas
- Replies: 2
- Views: 278
Cp/Cv formulas
On the formula sheet,Cp=(5/2)R. In the book, this is only true in regards to atoms, but for linear molecules its stated at Cp=(7/2)R. In the example 4C.1 for 7th addition they use (7/2). Cv is similar with Cv=(3/2)R and (5/2)R for linear molecules. When do you know which equation to use?
- Sun Jan 27, 2019 12:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: Modules
- Replies: 17
- Views: 1232
Re: Modules
I read somewhere that the post module assessments are mandatory, but they are also anonymous. Is this just basically saying that they are highly recommended? I also could be recalling that incorrectly too.
- Sun Jan 27, 2019 12:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q(cal)= -q
- Replies: 2
- Views: 715
q(cal)= -q
Could someone explain why this is an equation? Like how was this derived and when to apply it?
- Sun Jan 27, 2019 12:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: death in biological systems
- Replies: 5
- Views: 463
death in biological systems
Outline 2 states that we should be able to calculate the pH in a variety of different applied examples. One of which is death in a biological system. I don't really recall this is lecture or in the book. If anyone has notes from lecture or a page in the book let me know! Thank you
- Sun Jan 20, 2019 6:40 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: endo/exothermic rxns
- Replies: 5
- Views: 446
endo/exothermic rxns
Is there a way to tell if a reaction is endo or exothermic by looking at the equation?
- Sun Jan 20, 2019 4:33 pm
- Forum: Student Social/Study Group
- Topic: test 1
- Replies: 10
- Views: 1118
test 1
Does anyone know what specifically will be on test one? Will it be strictly outline 1? Or will it include acid/base as well?
- Sun Jan 20, 2019 4:10 pm
- Forum: Ideal Gases
- Topic: Concentration or Partial Pressure
- Replies: 13
- Views: 914
Re: Concentration or Partial Pressure
When do you know if you should use to the equation to convert it or not?
- Sat Jan 12, 2019 2:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: partial pressures vs concentrations
- Replies: 4
- Views: 285
partial pressures vs concentrations
I am still very confused on when to use the partial pressures or concentrations to calculate k. What will it say in the problem to suggest which to use?
- Thu Jan 10, 2019 8:14 pm
- Forum: Student Social/Study Group
- Topic: New to Lavelle
- Replies: 32
- Views: 5189
Re: New to Lavelle
I would definitely spend the time to really get used to using chemistry community, the more you take advantage of it the more it helps. Even if you don't reach out to other students for study groups, you can still get quick and easy help and sometimes tests/midterms/finals reference discussions made...
- Mon Jan 07, 2019 7:48 pm
- Forum: Student Social/Study Group
- Topic: lecture notes first day of class
- Replies: 2
- Views: 328
lecture notes first day of class
Hello, I had to miss lecture today due to a swim meet, and would be so grateful if someone could tell me the general topics/ announcements that were made in class today. Thank you!
- Sat Dec 08, 2018 7:21 pm
- Forum: Air Pollution & Acid Rain
- Topic: other biological examples
- Replies: 4
- Views: 782
other biological examples
Besides acid rain, are there any other biological examples of acid/base that we should be familiar with?
- Wed Dec 05, 2018 10:39 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: 6C.17
- Replies: 1
- Views: 231
6C.17
For this question, you have to determine whether hypobromite ion or morphine is a stronger base. Then, in the solutions manual, they state that hypobromite is a stronger base because the pKb value is lower. How is this determined when the only thing you are given is the the chemical formula? Am I mi...
Cyanide
I see cyanido and cyano are both used in the book/solutions manual. Are these the same or are they different compounds?
- Sun Dec 02, 2018 11:20 pm
- Forum: Student Social/Study Group
- Topic: friday lecture notes
- Replies: 2
- Views: 670
Re: friday lecture notes
Thank you so much!
- Sun Dec 02, 2018 3:17 pm
- Forum: Bronsted Acids & Bases
- Topic: ionic equations
- Replies: 1
- Views: 2006
ionic equations
For the ionic equations for acids/bases, do weak acids break up into ions? Or do they stay whole when you write the equation?
- Fri Nov 30, 2018 6:50 pm
- Forum: Student Social/Study Group
- Topic: friday lecture notes
- Replies: 2
- Views: 670
friday lecture notes
I'm out of the state right now and was unable to attend lecture today. If someone could post the notes for today as well as any announcements that would be amazing. Thanks so much!
- Wed Nov 28, 2018 5:17 pm
- Forum: Hybridization
- Topic: atomic orbitals
- Replies: 2
- Views: 267
atomic orbitals
does a lone pair count as an atomic orbital? For some reason my answers have been different than the key and would only be possible if a lone pair counts I think.
- Wed Nov 28, 2018 12:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 7th edition 2E.25 a)
- Replies: 1
- Views: 198
7th edition 2E.25 a)
How is CH2Cl2 polar? The structure appears to be tetrahedral to me.
- Wed Nov 28, 2018 11:00 am
- Forum: Naming
- Topic: Coordination number
- Replies: 10
- Views: 2017
Re: Coordination number
Can the term coordination number apply to all molecules? or only some?
- Wed Nov 28, 2018 10:58 am
- Forum: Hybridization
- Topic: hybridized orbitals
- Replies: 2
- Views: 322
hybridized orbitals
I'm still a little bit confused about hybridized orbitals in terms of what causes them (if that makes sense). Do all molecules have hybridized orbitals?
- Wed Nov 28, 2018 10:55 am
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 12
- Views: 1655
Re: Final
Has anyone said anything about how much high school chem will be on it? (empirical formula etc)
- Tue Nov 20, 2018 1:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: lone pairs
- Replies: 4
- Views: 431
lone pairs
Do lone pairs on non central atoms affect the shape of the molecule?
- Sun Nov 18, 2018 1:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: electron density/concentration
- Replies: 4
- Views: 468
electron density/concentration
What is the difference between high electron density and high electron concentration? Or are they the same thing?
- Sun Nov 18, 2018 12:06 am
- Forum: Hybridization
- Topic: Bond Angles
- Replies: 12
- Views: 1111
Re: Bond Angles
is there a set degree that a lone pair shifts the surrounding bonds around it? Or does this just come from experiments?
- Sun Nov 18, 2018 12:05 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 16
- Views: 1157
Re: Bond Angles
For this, is there a way to calculate or memorize bond angles when there is a lone pair? It is usually slightly different than the angles of the normal structure. Is there a set degree amount that a lone pair shifts a bond?
- Wed Nov 14, 2018 6:19 pm
- Forum: Hybridization
- Topic: Bond Angels
- Replies: 5
- Views: 645
Re: Bond Angels
Will molecules of the same shape always have the same bond angles? Like will all tetrahedral molecules etc have the same angles regardless of the molecule?
- Sat Nov 10, 2018 7:19 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 6
- Views: 551
Re: Bond Lengths
Is there any common bond lengths that we should be familiar with?
- Sat Nov 10, 2018 7:18 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonds
- Replies: 20
- Views: 1447
Re: Hydrogen Bonds
Additionally, would it be important to be familiar with the energies of different types of bonds?
- Thu Nov 08, 2018 6:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent Bonds
- Replies: 18
- Views: 1734
Re: Ionic vs Covalent Bonds
The book states that most bonds are somewhere in between purely covalent and purely ionic. When depicting these bonds, how does one know when to depict a bond as ionic or covalent when it is in this in between state?
- Wed Oct 31, 2018 8:58 pm
- Forum: Ionic & Covalent Bonds
- Topic: p block atoms
- Replies: 4
- Views: 335
p block atoms
If I remember correctly it was mentioned that some p-block atoms can have more than an octet. Is there a way to tell if a certain atom can form more than an octet? Or is it something that is easier just to memorize?
- Wed Oct 31, 2018 8:55 pm
- Forum: Lewis Structures
- Topic: lewis acid/base
- Replies: 2
- Views: 204
lewis acid/base
I was confused about the naming of certain elements and calling them a lewis acid or base. What makes these elements an acid or base? Or is it just based on if they donate a lone pair or not?
- Mon Oct 29, 2018 8:11 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity
- Replies: 3
- Views: 507
Re: Electron affinity
does electron affinity and electronegativity have the same trends on the periodic table?
- Sun Oct 28, 2018 9:21 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Units
- Replies: 8
- Views: 670
Re: Units
How do the units in the equation cancel out? What units are you left with after the equation has been completed?
- Sun Oct 28, 2018 9:16 pm
- Forum: Student Social/Study Group
- Topic: Studying for tests/midterm
- Replies: 18
- Views: 2663
Re: Studying for tests/midterm
I find that the test questions always have a bit of a higher level of thinking than is required in the homework problems. What is the best way to study problem solving?
- Sun Oct 28, 2018 9:12 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d before 4s for Z > 10
- Replies: 3
- Views: 268
Re: 3d before 4s for Z > 10
I was confused on this as well, in high school I was always taught to write 4s3d but in the book and in class it has 3d before 4s. Is there a difference between the two?
- Tue Oct 16, 2018 7:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Registering/Creating Your Chemistry Community Account
- Replies: 40
- Views: 100265
Re: Registering/Creating Your Chemistry Community Account
I haven't been able to register until now, could I make up the points by posting more this week?
- Tue Oct 16, 2018 6:56 pm
- Forum: SI Units, Unit Conversions
- Topic: formula units [ENDORSED]
- Replies: 69
- Views: 32379
Re: formula units [ENDORSED]
Yes, it just means number of atoms which means you use 6.022x10^23