Search found 44 matches

by 105085381
Mon Feb 11, 2019 2:42 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Using R
Replies: 10
Views: 162

Re: Using R

So we know which form of R to use based off of the formula sheet provided to us? Can someone clairfy the possible unit values (atm or joules or Torr) per form of R?
by 105085381
Mon Feb 11, 2019 2:38 pm
Forum: Environment, Fossil Fuels, Alternative Fuels
Topic: midterm
Replies: 3
Views: 204

Re: midterm

Just to clarify/confirm - environment, fossil fuels, and alternative fuels will not be on the midterm exam? If they will be, what topics are they associated with...thermodynamics?
by 105085381
Mon Feb 11, 2019 2:36 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Statistical vs Residual Entropy
Replies: 4
Views: 82

Re: Statistical vs Residual Entropy

Will we need to be able to identify the difference between statistical vs residual entropy on the midterm?
by 105085381
Mon Feb 11, 2019 2:35 pm
Forum: Ideal Gases
Topic: The Difference between Q and Kc
Replies: 12
Views: 379

Re: The Difference between Q and Kc

Both Q and K are calculated using the same equations - Q can calculate a particular point of the reaction / K calculates the reaction at equilibrium!
by 105085381
Mon Feb 11, 2019 2:32 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 81
Views: 52155

Re: Reading the textbook [ENDORSED]

Reading the textbook and working through the practice problems provided in each section - in addition to the homework problems per week - really helped better my understanding behind the details of the ideal gases and thermodynamics!!
by 105085381
Mon Feb 11, 2019 2:31 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpies
Replies: 10
Views: 139

Re: Bond enthalpies

Will the bond dissociation energies definitely be given?
by 105085381
Tue Jan 15, 2019 6:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Adding Equations
Replies: 3
Views: 47

Re: Adding Equations

Multiplying the equilibrium constants of the two equations gives you the final outcome of the reaction
by 105085381
Tue Jan 15, 2019 6:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table
Replies: 4
Views: 72

Re: ICE table

Is the ICE table used purely to find missing concentrations?
by 105085381
Tue Jan 15, 2019 6:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: If you calcuate Kp and Kc for the same reaction, will they be the same?
Replies: 2
Views: 43

Re: If you calcuate Kp and Kc for the same reaction, will they be the same?

It varies based on reaction. You know whether Kp and Kc are the same based on your calculations!
by 105085381
Tue Jan 08, 2019 6:15 pm
Forum: Ideal Gases
Topic: Pressure units
Replies: 4
Views: 139

Re: Pressure units

I think we are fine labeling the units for Kp as either bars or atmosphere. Whereas, Kc is identified in molar/moles.
by 105085381
Tue Jan 08, 2019 6:13 pm
Forum: Ideal Gases
Topic: Q and K [ENDORSED]
Replies: 35
Views: 1075

Re: Q and K [ENDORSED]

K is found using concentrations at equilibrium, BUT to calculate Q do we just use the initial concentrations or concentrations at any given time?
by 105085381
Tue Jan 08, 2019 6:11 pm
Forum: Ideal Gases
Topic: Equilibrium Constants
Replies: 4
Views: 77

Re: Equilibrium Constants

By doubling the the number of moles of a specific molecule, do the coefficients and exponents work proportional to one another in order to maintain the equilibrium of K?
by 105085381
Fri Dec 07, 2018 3:12 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ranking strong acids and bases
Replies: 4
Views: 86

Re: Ranking strong acids and bases

Can someone further explain how to rank strong acids versus bases?
by 105085381
Fri Nov 16, 2018 2:05 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bond
Replies: 7
Views: 126

Re: Hydrogen Bond

Intramolecular forces are the forces that hold atoms together within a molecule. Intermolecular forces are forces that exist between molecules.
by 105085381
Fri Nov 16, 2018 2:03 pm
Forum: Dipole Moments
Topic: Test
Replies: 15
Views: 233

Re: Test

The next test, following the midterm, is week 9 - after Thanksgiving. Can anyone provide a list of the remaining topics (dipole moments, sigma/pi bonds, and electronegativity) that will be covered on the week 9 test?
by 105085381
Fri Nov 16, 2018 1:59 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 111

Re: Dipole Moments

Do dipole moments always rely on whether a molecule is polar or nonpolar?
by 105085381
Thu Nov 15, 2018 8:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is H3O+ bond angle 109.5?
Replies: 2
Views: 5298

Re: Why is H3O+ bond angle 109.5?

Why is it a tetrahedral and not a trigonal planar? Are there other examples of this other than with H3O+?
by 105085381
Thu Nov 08, 2018 8:06 pm
Forum: Hybridization
Topic: How to figure out hybridization
Replies: 5
Views: 648

Re: How to figure out hybridization

When you say regions of electron density, are you referring to using the periodic table? Could you explain how to look for this please?
by 105085381
Thu Nov 08, 2018 8:04 pm
Forum: Hybridization
Topic: Pi bonds in triple bond
Replies: 17
Views: 398

Re: Pi bonds in triple bond

^What are the exceptions for the octet rule in triple bonds?
by 105085381
Thu Nov 08, 2018 8:03 pm
Forum: Hybridization
Topic: 4.41
Replies: 4
Views: 340

Re: 4.41

Does anyone have a good way to remember the degrees per shape?
by 105085381
Wed Nov 07, 2018 5:35 pm
Forum: Bond Lengths & Energies
Topic: Calculating Bond Lengths
Replies: 4
Views: 109

Re: Calculating Bond Lengths

Weak (longer) bonds are easily broken and more likely involved in reaction.
Strong (shorter) bonds are harder to break and less reactive.
by 105085381
Wed Nov 07, 2018 5:31 pm
Forum: Bond Lengths & Energies
Topic: bond lengths and strengths
Replies: 9
Views: 158

Re: bond lengths and strengths

Strength of a bond is measured by its' dissociation energy (the energy required to break a bond)
by 105085381
Wed Nov 07, 2018 5:28 pm
Forum: Ionic & Covalent Bonds
Topic: ionic bonds and covalent character [ENDORSED]
Replies: 2
Views: 47

Re: ionic bonds and covalent character [ENDORSED]

What is covalent bond dissociation? Could someone please simplify the process... thank you!!
by 105085381
Wed Nov 07, 2018 5:26 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Dispersion/ Induced dipole-Induced dipole
Replies: 2
Views: 57

Re: Dispersion/ Induced dipole-Induced dipole

Can someone please explain whether dipole moments are always polar or not? Thanks!!
by 105085381
Mon Oct 29, 2018 1:22 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 81
Views: 52155

Re: Reading the textbook [ENDORSED]

I find it helpful to read the textbook, but I also get confused a lot after! I then will watch Crash Course on Youtube for whatever concept it is that I am confused by. They often work through examples and explain the topic step by step. I think it really helps for clarity and betters my understandi...
by 105085381
Mon Oct 29, 2018 1:20 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Paramagnetism
Replies: 3
Views: 296

Re: Paramagnetism

How can we apply paramagnetism in chemistry 14A? Can someone possible provide an example? I would appreciate it!!
by 105085381
Mon Oct 29, 2018 1:15 pm
Forum: Trends in The Periodic Table
Topic: Smallest ionic radius [ENDORSED]
Replies: 6
Views: 167

Re: Smallest ionic radius [ENDORSED]

Elements increase in atomic size down the periodic table, as they gain shells, and decrease across the periodic table (from left to right)!
by 105085381
Mon Oct 29, 2018 1:14 pm
Forum: Trends in The Periodic Table
Topic: Ionization energies
Replies: 9
Views: 183

Re: Ionization energies

Atomic radius... - increases in atomic size down the periodic table, as shells increase - decreases across the periodic table from left to right Ionization energy (the energy needed to add to remove an electron)... - decreases down the periodic table - increases across the period table from left to ...
by 105085381
Mon Oct 29, 2018 1:11 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 494

Re: Work Function

The equation Ek=hv-work will always help you find your solution, in this case!
by 105085381
Mon Oct 29, 2018 1:10 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 20
Views: 682

Re: E=hv

I understand that... The E in E = hv represents the energy of a photon. The E in Ek = 1/2(mv^2) represents the excess energy after an electron is removed from a metal. ...but, can someone please clarify what the specific values are that we need to assign as hv and 1/2(mv^2)? Sorry if this was alread...
by 105085381
Mon Oct 29, 2018 1:07 pm
Forum: *Shrodinger Equation
Topic: Help on how to find l, ml, and ms
Replies: 6
Views: 515

Re: Help on how to find l, ml, and ms

SHELL --> n = 1,...,infinity
SUBSHELL --> l = {0,...,n-1}
ORIENTATION OF ORBITAL SPIN --> ml = {-l,...+l}
SPIN --> ms = {-1/2, +1/2}

These are the fundamental rules needed to determine sub-shell notation, electron configuration, valence electrons, unpaired electrons, etc.!
by 105085381
Mon Oct 29, 2018 1:04 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 6
Views: 377

Re: Schrodinger's Equation

I know we have not needed to yet, but will we need to be able to apply Schrodinger's Equation on the midterm exam?
by 105085381
Mon Oct 29, 2018 1:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 912355

Re: Post All Chemistry Jokes Here

Old chemists never die, they just stop reacting.
by 105085381
Mon Oct 29, 2018 1:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 912355

Re: Post All Chemistry Jokes Here

Why do chemists like nitrates so much?
They're cheaper than day rates.
by 105085381
Mon Oct 29, 2018 12:59 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 912355

Re: Post All Chemistry Jokes Here

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
by 105085381
Mon Oct 29, 2018 12:57 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 113
Views: 71332

Re: Rusty on High School Chem [ENDORSED]

I have been reviewing each concept after lecture by watching the Crash Course videos on YouTube. They have been helpful in clarifying and breaking down what is being taught in class. I definitely recommend watching a few. Hope it helps!
by 105085381
Mon Oct 29, 2018 12:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Exam
Replies: 7
Views: 235

Re: Exam

Does anyone know roughly how long the midterm exam will be?
by 105085381
Mon Oct 29, 2018 12:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 58772

Re: Advice from a Medical Student [ENDORSED]

I am a pre-med, first year student who needed this advice, especially regarding the chemistry series. Thanks so much!!
by 105085381
Mon Oct 29, 2018 12:49 pm
Forum: Hybridization
Topic: Electron Configuration - Orbital Diagrams
Replies: 1
Views: 133

Electron Configuration - Orbital Diagrams

In drawing out an orbital diagram for an element, can someone explain the easiest steps to take? I know you have to take the electron configuration and work from there, but how can you be sure that your orbital diagram correctly translates from the electron configuration?
by 105085381
Wed Oct 03, 2018 5:58 pm
Forum: Limiting Reactant Calculations
Topic: M.11
Replies: 8
Views: 323

Re: M.11

Is O2 or P4 the limiting reactant for part a? Can someone please explain which and why. Thanks so much!
by 105085381
Wed Oct 03, 2018 5:51 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations (Problem H21 6th edition)
Replies: 3
Views: 75

Re: Balancing equations (Problem H21 6th edition)

Going off of what the initial post asked, does anyone know a more simple, yet speedier way to balance even the more general equations? Any faster method than just moving through the equation, element by element?
by 105085381
Wed Oct 03, 2018 5:49 pm
Forum: Empirical & Molecular Formulas
Topic: Resources given on tests [ENDORSED]
Replies: 3
Views: 127

Re: Resources given on tests [ENDORSED]

Are we definitely provided a periodic table for the test? We are also permitted to use calculators during the test, correct?
by 105085381
Wed Oct 03, 2018 5:43 pm
Forum: Empirical & Molecular Formulas
Topic: Problem F5 (7th Edition)
Replies: 1
Views: 206

Problem F5 (7th Edition)

Problem F5 asks for the mass percentage composition of L-carnitine, C7H15NO3, a compound taken as a dietary supplement to reduce muscle fatigue. My first step was to take each element and multiple its' coefficient by its' molar mass: 7C --> 7(12.01) = 84.07 15H --> 15(1.01) = 15.15 1N --> 1(14.007) ...

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