Search found 47 matches

by Jennifer Lathrop 1F
Sun Feb 17, 2019 8:53 pm
Forum: Student Social/Study Group
Topic: absent 2/15
Replies: 3
Views: 17

Re: absent 2/15

Great thank you!
by Jennifer Lathrop 1F
Sun Feb 17, 2019 7:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Remembering Equations
Replies: 3
Views: 22

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.
by Jennifer Lathrop 1F
Sun Feb 17, 2019 7:42 pm
Forum: Student Social/Study Group
Topic: absent 2/15
Replies: 3
Views: 17

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!
by Jennifer Lathrop 1F
Sun Feb 10, 2019 7:14 pm
Forum: Student Social/Study Group
Topic: midterm/homework
Replies: 2
Views: 34

Re: midterm/homework

Thank you!
by Jennifer Lathrop 1F
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: 5
Views: 17

equations for q

How do you know when to use q=nC(delta)T , q=mCdeltaT or just q=C(delta)T
by Jennifer Lathrop 1F
Sat Feb 09, 2019 10:03 pm
Forum: Student Social/Study Group
Topic: midterm/homework
Replies: 2
Views: 34

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?
by Jennifer Lathrop 1F
Sun Feb 03, 2019 10:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q(cal)= -q
Replies: 2
Views: 29

Re: q(cal)= -q

thank you!
by Jennifer Lathrop 1F
Sun Feb 03, 2019 10:54 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp/Cv formulas
Replies: 2
Views: 28

Re: Cp/Cv formulas

Thank you!
by Jennifer Lathrop 1F
Wed Jan 30, 2019 5:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp/Cv formulas
Replies: 2
Views: 28

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?
by Jennifer Lathrop 1F
Sun Jan 27, 2019 12:58 pm
Forum: Phase Changes & Related Calculations
Topic: Modules
Replies: 17
Views: 75

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.
by Jennifer Lathrop 1F
Sun Jan 27, 2019 12:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q(cal)= -q
Replies: 2
Views: 29

q(cal)= -q

Could someone explain why this is an equation? Like how was this derived and when to apply it?
by Jennifer Lathrop 1F
Sun Jan 27, 2019 12:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: death in biological systems
Replies: 5
Views: 48

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
by Jennifer Lathrop 1F
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: 26

endo/exothermic rxns

Is there a way to tell if a reaction is endo or exothermic by looking at the equation?
by Jennifer Lathrop 1F
Sun Jan 20, 2019 4:33 pm
Forum: Student Social/Study Group
Topic: test 1
Replies: 9
Views: 48

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?
by Jennifer Lathrop 1F
Sun Jan 20, 2019 4:10 pm
Forum: Ideal Gases
Topic: Concentration or Partial Pressure
Replies: 13
Views: 66

Re: Concentration or Partial Pressure

When do you know if you should use to the equation to convert it or not?
by Jennifer Lathrop 1F
Sat Jan 12, 2019 2:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: partial pressures vs concentrations
Replies: 4
Views: 25

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?
by Jennifer Lathrop 1F
Thu Jan 10, 2019 8:14 pm
Forum: Student Social/Study Group
Topic: New to Lavelle
Replies: 32
Views: 408

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...
by Jennifer Lathrop 1F
Mon Jan 07, 2019 7:48 pm
Forum: Student Social/Study Group
Topic: lecture notes first day of class
Replies: 2
Views: 52

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!
by Jennifer Lathrop 1F
Sat Dec 08, 2018 7:21 pm
Forum: Air Pollution & Acid Rain
Topic: other biological examples
Replies: 1
Views: 28

other biological examples

Besides acid rain, are there any other biological examples of acid/base that we should be familiar with?
by Jennifer Lathrop 1F
Wed Dec 05, 2018 10:39 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: 6C.17
Replies: 1
Views: 34

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...
by Jennifer Lathrop 1F
Tue Dec 04, 2018 9:02 pm
Forum: Naming
Topic: Cyanide
Replies: 6
Views: 47

Cyanide

I see cyanido and cyano are both used in the book/solutions manual. Are these the same or are they different compounds?
by Jennifer Lathrop 1F
Sun Dec 02, 2018 11:20 pm
Forum: Student Social/Study Group
Topic: friday lecture notes
Replies: 2
Views: 62

Re: friday lecture notes

Thank you so much!
by Jennifer Lathrop 1F
Sun Dec 02, 2018 3:17 pm
Forum: Bronsted Acids & Bases
Topic: ionic equations
Replies: 1
Views: 21

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?
by Jennifer Lathrop 1F
Fri Nov 30, 2018 6:50 pm
Forum: Student Social/Study Group
Topic: friday lecture notes
Replies: 2
Views: 62

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!
by Jennifer Lathrop 1F
Wed Nov 28, 2018 5:17 pm
Forum: Hybridization
Topic: atomic orbitals
Replies: 2
Views: 25

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.
by Jennifer Lathrop 1F
Wed Nov 28, 2018 12:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 7th edition 2E.25 a)
Replies: 1
Views: 15

7th edition 2E.25 a)

How is CH2Cl2 polar? The structure appears to be tetrahedral to me.
by Jennifer Lathrop 1F
Wed Nov 28, 2018 11:00 am
Forum: Naming
Topic: Coordination number
Replies: 10
Views: 241

Re: Coordination number

Can the term coordination number apply to all molecules? or only some?
by Jennifer Lathrop 1F
Wed Nov 28, 2018 10:58 am
Forum: Hybridization
Topic: hybridized orbitals
Replies: 2
Views: 30

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?
by Jennifer Lathrop 1F
Wed Nov 28, 2018 10:55 am
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 154

Re: Final

Has anyone said anything about how much high school chem will be on it? (empirical formula etc)
by Jennifer Lathrop 1F
Tue Nov 20, 2018 1:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pairs
Replies: 4
Views: 31

lone pairs

Do lone pairs on non central atoms affect the shape of the molecule?
by Jennifer Lathrop 1F
Sun Nov 18, 2018 1:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electron density/concentration
Replies: 4
Views: 37

electron density/concentration

What is the difference between high electron density and high electron concentration? Or are they the same thing?
by Jennifer Lathrop 1F
Sun Nov 18, 2018 12:06 am
Forum: Hybridization
Topic: Bond Angles
Replies: 12
Views: 108

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?
by Jennifer Lathrop 1F
Sun Nov 18, 2018 12:05 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 16
Views: 102

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?
by Jennifer Lathrop 1F
Wed Nov 14, 2018 6:19 pm
Forum: Hybridization
Topic: Bond Angels
Replies: 5
Views: 76

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?
by Jennifer Lathrop 1F
Sat Nov 10, 2018 7:19 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 6
Views: 49

Re: Bond Lengths

Is there any common bond lengths that we should be familiar with?
by Jennifer Lathrop 1F
Sat Nov 10, 2018 7:18 pm
Forum: Dipole Moments
Topic: Hydrogen Bonds
Replies: 20
Views: 155

Re: Hydrogen Bonds

Additionally, would it be important to be familiar with the energies of different types of bonds?
by Jennifer Lathrop 1F
Thu Nov 08, 2018 6:25 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent Bonds
Replies: 18
Views: 156

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?
by Jennifer Lathrop 1F
Wed Oct 31, 2018 7:58 pm
Forum: Ionic & Covalent Bonds
Topic: p block atoms
Replies: 4
Views: 79

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?
by Jennifer Lathrop 1F
Wed Oct 31, 2018 7:55 pm
Forum: Lewis Structures
Topic: lewis acid/base
Replies: 2
Views: 47

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?
by Jennifer Lathrop 1F
Mon Oct 29, 2018 7:11 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity
Replies: 3
Views: 60

Re: Electron affinity

does electron affinity and electronegativity have the same trends on the periodic table?
by Jennifer Lathrop 1F
Sun Oct 28, 2018 8:21 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Units
Replies: 8
Views: 124

Re: Units

How do the units in the equation cancel out? What units are you left with after the equation has been completed?
by Jennifer Lathrop 1F
Sun Oct 28, 2018 8:16 pm
Forum: Student Social/Study Group
Topic: Studying for tests/midterm
Replies: 18
Views: 760

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?
by Jennifer Lathrop 1F
Sun Oct 28, 2018 8:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d before 4s for Z > 10
Replies: 3
Views: 42

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?
by Jennifer Lathrop 1F
Tue Oct 16, 2018 6:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Registering/Creating Your Chemistry Community Account
Replies: 17
Views: 15272

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?
by Jennifer Lathrop 1F
Tue Oct 16, 2018 5:56 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 20109

Re: formula units [ENDORSED]

Yes, it just means number of atoms which means you use 6.022x10^23

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