Search found 76 matches

by Lauryn Jordan 1F
Sun Mar 18, 2018 2:13 am
Forum: General Science Questions
Topic: Extensive and Intensive
Replies: 1
Views: 240

Extensive and Intensive

Aside from standard cell potential is there any other intensive things?
by Lauryn Jordan 1F
Sat Mar 17, 2018 1:32 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: wmax
Replies: 4
Views: 265

wmax

is wmax equal to ΔG° or just ΔG?
by Lauryn Jordan 1F
Tue Mar 13, 2018 8:19 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 1
Views: 105

arrhenius equation

when do you use this equation?
by Lauryn Jordan 1F
Tue Mar 13, 2018 8:18 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 3
Views: 122

arrhenius equation

when do you use this equation?
by Lauryn Jordan 1F
Tue Mar 13, 2018 7:42 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Isobaric
Replies: 1
Views: 94

Isobaric

for an isobaric equation, since delta p = 0, is the internal energy = delta h?
by Lauryn Jordan 1F
Tue Mar 13, 2018 7:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Bomb Calorimeter
Replies: 2
Views: 230

Bomb Calorimeter

I made a note that says bomb calorimeter = constant volume, how would you find the internal energy? does constant volume mean delta v = 0?
by Lauryn Jordan 1F
Mon Mar 12, 2018 11:37 am
Forum: *Alcohols
Topic: functional groups [ENDORSED]
Replies: 4
Views: 381

functional groups [ENDORSED]

will we need to know functional groups for the final?
by Lauryn Jordan 1F
Wed Mar 07, 2018 12:50 am
Forum: General Rate Laws
Topic: What equation is this?
Replies: 1
Views: 88

What equation is this?

what equation is this and when do you use it?


ln (k1/k2) = Ea/R (1/T2 - 1/T1)
by Lauryn Jordan 1F
Wed Mar 07, 2018 12:48 am
Forum: General Rate Laws
Topic: Rate of Formation/Concentration [ENDORSED]
Replies: 1
Views: 84

Rate of Formation/Concentration [ENDORSED]

When do you use rate of formation and/or rate of concentration?
by Lauryn Jordan 1F
Wed Mar 07, 2018 12:34 am
Forum: Zero Order Reactions
Topic: zeroth order rate
Replies: 4
Views: 216

zeroth order rate

what is the zeroth order rate? is it -k?
by Lauryn Jordan 1F
Fri Mar 02, 2018 11:16 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Reaction
Replies: 6
Views: 183

Arrhenius Reaction

Did we already go over arrhenius reaction or are we going to?
by Lauryn Jordan 1F
Wed Feb 28, 2018 10:09 am
Forum: First Order Reactions
Topic: Derivation
Replies: 8
Views: 279

Derivation

are we going to have to derive or integrate the 1st or 2nd order for test 3 or the final?
by Lauryn Jordan 1F
Tue Feb 20, 2018 4:51 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Cell Potential
Replies: 9
Views: 2280

Cell Potential

when do you use each of the equations and what is the difference?
E = E° -RT/nF * ln Q
E = E° -0.05916 V / n * log Q
by Lauryn Jordan 1F
Tue Feb 20, 2018 4:46 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard cell potential
Replies: 1
Views: 93

Standard cell potential

when figuring out which reaction to flip so that you get the highest cell potential, do you add or subtract the two cell potentials?
by Lauryn Jordan 1F
Fri Feb 16, 2018 2:01 am
Forum: Balancing Redox Reactions
Topic: Cl2 and Cl -
Replies: 2
Views: 115

Cl2 and Cl -

if Cl is just 1- charge how come just making Cl -, 2Cl - doesn't make the charges cancel?
by Lauryn Jordan 1F
Wed Feb 14, 2018 11:20 am
Forum: Calculating Work of Expansion
Topic: irreversible work [ENDORSED]
Replies: 3
Views: 180

irreversible work [ENDORSED]

for irreversible expansions, do you use you use w= -p delta v?
by Lauryn Jordan 1F
Tue Feb 13, 2018 8:57 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: W
Replies: 3
Views: 277

W

can someone please explain in simple terms and give examples of how to find w for boltzmann equation
by Lauryn Jordan 1F
Tue Feb 13, 2018 6:50 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: PV = nRT
Replies: 6
Views: 246

PV = nRT

when do you use PV = nRT?
by Lauryn Jordan 1F
Tue Feb 13, 2018 6:41 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Spontaniety
Replies: 2
Views: 161

Spontaniety

does being spontaneous have anything to do with speed?
by Lauryn Jordan 1F
Tue Feb 13, 2018 6:39 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: reversible and isothermal
Replies: 1
Views: 112

reversible and isothermal

if something is reversible and isothermal, i know the total internal energy equals 0, therefore q = -w, but what else should i know about this?
by Lauryn Jordan 1F
Tue Feb 13, 2018 11:37 am
Forum: Calculating Work of Expansion
Topic: Work
Replies: 1
Views: 100

Work

For clarification, If a piston compresses does that mean work is positive? And if it expands does that mean work is negative?
by Lauryn Jordan 1F
Fri Feb 09, 2018 10:52 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta g
Replies: 2
Views: 102

Re: delta g

delta g r*
by Lauryn Jordan 1F
Fri Feb 09, 2018 10:51 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta g
Replies: 2
Views: 102

delta g

what's the difference between delta g, and delta r r, as well as delta g r knot?
by Lauryn Jordan 1F
Tue Feb 06, 2018 8:56 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Kelvin
Replies: 4
Views: 166

Kelvin

Do you always have to use kelvin with regards to temperature?
by Lauryn Jordan 1F
Tue Feb 06, 2018 8:49 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: entropy chnage
Replies: 1
Views: 64

entropy chnage

in question 9.5 why is it -50 j.k? can someone explain where the negative came from
by Lauryn Jordan 1F
Mon Feb 05, 2018 11:17 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: temperature
Replies: 5
Views: 147

temperature

for measuring temperature in kelvin on the test do we use 273.15 or just 273?
by Lauryn Jordan 1F
Mon Jan 29, 2018 2:10 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity of a reaction
Replies: 2
Views: 126

Spontaneity of a reaction

In class we discussed rxn or physical change between the change in s and change in h, Dr. Lavelle mentioned that when delta s is negative and delta h is positive it is never spontaneous but the reverse is. does this mean that the reverse of the other 3 would not be spontaneous?
by Lauryn Jordan 1F
Tue Jan 23, 2018 11:52 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: calorie and Calorie
Replies: 2
Views: 103

Re: calorie and Calorie

What is 1 calorie?
by Lauryn Jordan 1F
Tue Jan 23, 2018 11:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 4
Views: 140

Bond Enthalpies

Is bond enthalpies the sum of reactions minus the sum of products or the sum of products minus the sum of reactants?
by Lauryn Jordan 1F
Tue Jan 23, 2018 11:15 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: calorie and Calorie
Replies: 2
Views: 103

calorie and Calorie

do we need to know the conversions for calorie and Calorie or will they be provided?
by Lauryn Jordan 1F
Tue Jan 23, 2018 9:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: mass in q = m(c) delta t
Replies: 5
Views: 388

mass in q = m(c) delta t

when must you covert the g to moles when using the equation for specific heat?
by Lauryn Jordan 1F
Mon Jan 22, 2018 11:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1805

Re: Week 3 Test Topic is endorsed

will internal energy be on the test?
by Lauryn Jordan 1F
Fri Jan 19, 2018 1:51 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy at constant pressure and volume [ENDORSED]
Replies: 3
Views: 121

Enthalpy at constant pressure and volume [ENDORSED]

with regards to enthalpy, are we expeced to be able to calculate the heat released at a constant volume or pressure? also what is this 5/2R and 3/2 R business?
by Lauryn Jordan 1F
Fri Jan 19, 2018 1:37 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capcity for Water
Replies: 8
Views: 263

Heat Capcity for Water

How do you know which heat capacity to use for water?
by Lauryn Jordan 1F
Fri Jan 19, 2018 1:09 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal Energy/Open System
Replies: 2
Views: 120

Internal Energy/Open System

What are the three ways you can increase the internal energy of an open system?
by Lauryn Jordan 1F
Fri Jan 19, 2018 1:09 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal Energy/Open System
Replies: 4
Views: 194

Internal Energy/Open System

What are the three ways you can increase the internal energy of an open system?
by Lauryn Jordan 1F
Wed Jan 17, 2018 10:59 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Breaking or forming
Replies: 5
Views: 149

Re: Bond Breaking or forming

yeah that makes sense, so my follow up question would be after drawing the electron configurations how could you tell if a bond is broken or formed like what would it look like?
by Lauryn Jordan 1F
Wed Jan 17, 2018 10:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Breaking or forming
Replies: 5
Views: 149

Bond Breaking or forming

When looking at a rxn, is there another way aside from looking at the delta h to know if a bond is forming or breaking?
by Lauryn Jordan 1F
Wed Jan 17, 2018 10:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cm
Replies: 3
Views: 146

Cm

what is Cm in the equation q = n (delta t) (Cm)?
by Lauryn Jordan 1F
Sun Jan 14, 2018 4:31 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q and w
Replies: 5
Views: 181

Re: q and w

soooo my follow up question would be when do you know when work is done on a system vs done by a system?
by Lauryn Jordan 1F
Sun Jan 14, 2018 4:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond and Standard Formation Enthalpies
Replies: 1
Views: 76

Bond and Standard Formation Enthalpies

with bond enthalpies and standard formation enthalpies, i know they're are equations you must follow, what are they and what is each part of the equation?
by Lauryn Jordan 1F
Sun Jan 14, 2018 4:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q and w
Replies: 5
Views: 181

q and w

can someone clarify what q and w are as well as how can you tell if they will be positive or negative?
by Lauryn Jordan 1F
Sun Dec 10, 2017 12:22 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH from pka
Replies: 3
Views: 226

Re: Calculating pH from pka

like if it asks for the ph but gives you the pka how do you find ph?
by Lauryn Jordan 1F
Sun Dec 10, 2017 12:21 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH from pka
Replies: 3
Views: 226

Re: Calculating pH from pka

would you find the negative log of the pka to find your ka?
by Lauryn Jordan 1F
Sat Dec 09, 2017 11:57 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH from pka
Replies: 3
Views: 226

Calculating pH from pka

If you are given a pka, how do you go about finding the pH?
by Lauryn Jordan 1F
Sat Dec 09, 2017 2:50 pm
Forum: Properties of Light
Topic: Speed of light wavelength equation [ENDORSED]
Replies: 4
Views: 232

Speed of light wavelength equation [ENDORSED]

When do you use the c = wavelength x frequency?
by Lauryn Jordan 1F
Fri Dec 08, 2017 2:03 pm
Forum: Ionic & Covalent Bonds
Topic: Memorization of Electronegativity
Replies: 6
Views: 271

Memorization of Electronegativity

Do we need to memorize the actual electronegativity chart as far as values or is just knowing the basic trend enough?
by Lauryn Jordan 1F
Wed Dec 06, 2017 9:18 pm
Forum: Ionic & Covalent Bonds
Topic: ionic character
Replies: 1
Views: 128

ionic character

what does “ionic character” mean?
by Lauryn Jordan 1F
Wed Dec 06, 2017 9:17 pm
Forum: Ionic & Covalent Bonds
Topic: polarizing power
Replies: 1
Views: 139

polarizing power

what does “polarizing power” mean? Also what does “more polarizable ion” mean?
by Lauryn Jordan 1F
Tue Dec 05, 2017 2:54 pm
Forum: Identifying Acidic & Basic Salts
Topic: HClO2
Replies: 1
Views: 239

HClO2

For HClO2 why does it prefer the second O to be connected to the Cl instead of making a chain like Cl-O-O-H?
by Lauryn Jordan 1F
Tue Dec 05, 2017 1:04 am
Forum: Conjugate Acids & Bases
Topic: Acids and Bases [ENDORSED]
Replies: 8
Views: 510

Re: Acids and Bases [ENDORSED]

I honestly don't know, but I doubt it. I was told to memorize them by my plf. There's also a list of strong bases. LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2
by Lauryn Jordan 1F
Tue Dec 05, 2017 12:50 am
Forum: Conjugate Acids & Bases
Topic: Acids and Bases [ENDORSED]
Replies: 8
Views: 510

Re: Acids and Bases [ENDORSED]

there is a list of strong acids, if it is not one of those, it is considered weak. the list of strong acids include HCl, HBr, HI, HNO3, HClO3, HClO4, H2SO4
by Lauryn Jordan 1F
Mon Nov 27, 2017 5:07 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Backward Reaction
Replies: 2
Views: 283

Backward Reaction

When do you know the reaction is going backwards instead of forwards ?
by Lauryn Jordan 1F
Mon Nov 27, 2017 2:17 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 891018

Re: Post All Chemistry Jokes Here

What is your LiFe composed of?

-Lithium and iron
by Lauryn Jordan 1F
Thu Nov 23, 2017 1:29 pm
Forum: Hybridization
Topic: Pi Bonds vs. Sigma Bonds
Replies: 7
Views: 301

Re: Pi Bonds vs. Sigma Bonds

a single bond has a sigma bond, a double bond has a sigma bond and a pi bond, and a triple bond has a sigma bond and 2 pi bonds
by Lauryn Jordan 1F
Mon Nov 20, 2017 1:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis structure and Vsper
Replies: 2
Views: 128

Lewis structure and Vsper

when drawing a lewis structure if we know the molecular shape of it from vsper do we draw it accordingly? or are we allowed to place the bonds andywhere around the central atom?
by Lauryn Jordan 1F
Sat Nov 18, 2017 11:23 am
Forum: Administrative Questions and Class Announcements
Topic: Homework [ENDORSED]
Replies: 1
Views: 150

Homework [ENDORSED]

Are we allowed to do chapter 4 for homework due next week or do we do chapter 17?
by Lauryn Jordan 1F
Wed Nov 15, 2017 12:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Regions of electron density
Replies: 4
Views: 215

Regions of electron density

Does a lone pair count as a region of e-density when determining the shape?
by Lauryn Jordan 1F
Thu Nov 09, 2017 12:40 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative Sign in Bohr's Equation
Replies: 3
Views: 2545

Negative Sign in Bohr's Equation

What is the significance/origin of the negative sign in Bohr's equation: En=-hR/n^2
by Lauryn Jordan 1F
Wed Nov 08, 2017 11:39 pm
Forum: Lewis Structures
Topic: Exceptions
Replies: 4
Views: 222

Re: Exceptions

chromium and copper
by Lauryn Jordan 1F
Wed Nov 08, 2017 11:29 pm
Forum: Ionic & Covalent Bonds
Topic: Polar vs. Non-polar
Replies: 7
Views: 344

Polar vs. Non-polar

How can you tell if a compound is polar or non polar?
by Lauryn Jordan 1F
Mon Nov 06, 2017 8:29 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity [ENDORSED]
Replies: 6
Views: 412

Re: Electron Affinity [ENDORSED]

Michael Cheng 1B wrote:What is the difference between electron affinity and electronegativity?



Electronegativity is how well an atom can attract electrons, while electron affinity is how much energy an atom releases when an electron is added.They both share the trend of increasing from bottom to top and left to right.
by Lauryn Jordan 1F
Mon Nov 06, 2017 8:18 am
Forum: Administrative Questions and Class Announcements
Topic: Homework for this week [ENDORSED]
Replies: 2
Views: 184

Homework for this week [ENDORSED]

Is the homework for this week chapter 3 or 4?
by Lauryn Jordan 1F
Thu Nov 02, 2017 1:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Orbitals
Replies: 1
Views: 91

Re: Orbitals

the l value is n-1, what you are talking about is ml, and it is -l to +l
by Lauryn Jordan 1F
Wed Nov 01, 2017 11:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Unpaired Electrons [ENDORSED]
Replies: 3
Views: 272

Re: Unpaired Electrons [ENDORSED]

you would need to know how many total electrons there are in the atom, what is the last subshell being used, and how many electrons can that subshell hold. Then in the last subshell, you put one arrow in each of the orbitals and then come back around to fill them. for example, if it was oxygen, ther...
by Lauryn Jordan 1F
Wed Nov 01, 2017 11:19 pm
Forum: Trends in The Periodic Table
Topic: Trends in the periodic table
Replies: 3
Views: 190

Re: Trends in the periodic table

electron affinity increases from left to right and increases from bottom to top, thereby making fluorine the most electron affinitive. (if that's a word)
by Lauryn Jordan 1F
Wed Oct 25, 2017 4:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration writing
Replies: 8
Views: 340

Re: Electron Configuration writing

When dealing with an atom that is an ion for example S^2- is it incorrect to write it in condensed from as [Ar]?
by Lauryn Jordan 1F
Wed Oct 25, 2017 12:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration writing
Replies: 8
Views: 340

Re: Electron Configuration writing

Yesterday we were trying to write rhodium’s electron configuration and we got 2 different answers, so then we looked at the lavelle periodic table and clarified which one is correct, so for clarification, is rhodium an exception like cooper and chromium?
by Lauryn Jordan 1F
Mon Oct 23, 2017 12:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electronic Configuration for d-block elements [ENDORSED]
Replies: 9
Views: 532

Re: Electronic Configuration for d-block elements [ENDORSED]

So for elements after 20 would you fill up the 4s and then return back to 3d or fill up 3D and then proceed?
by Lauryn Jordan 1F
Mon Oct 16, 2017 3:07 pm
Forum: Properties of Light
Topic: Quiz #2 References [ENDORSED]
Replies: 4
Views: 234

Re: Quiz #2 References [ENDORSED]

Do we have to print out the reference sheet ourselves or will it be given in class?
by Lauryn Jordan 1F
Thu Oct 05, 2017 1:14 am
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 12
Views: 677

Re: Sig Figs

If it was .5060 and you wrote it in scientific notation, It would be 5.060 x 10^-1 so would there be 3 or 4 sig figs?
by Lauryn Jordan 1F
Thu Oct 05, 2017 1:10 am
Forum: SI Units, Unit Conversions
Topic: Limiting Reagents [ENDORSED]
Replies: 8
Views: 523

Re: Limiting Reagents [ENDORSED]

It could also ask instead of limiting reactant, which one is the excess and how much excess is there? Or it could ask how many moles can be produced?

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