Search found 76 matches
- Sat Mar 16, 2019 10:40 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram - Water
- Replies: 2
- Views: 281
Re: Cell Diagram - Water
Water is not included in a cell diagram
- Sat Mar 16, 2019 10:38 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Ecell
- Replies: 3
- Views: 2005
Re: Ecell
A more positive Ecell is more spontaneous and, therefore, more favorable.
- Sat Mar 16, 2019 10:35 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: ∆H and q [ENDORSED]
- Replies: 6
- Views: 734
Re: ∆H and q [ENDORSED]
At constant pressure
- Sun Mar 10, 2019 8:07 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
- Sun Mar 10, 2019 8:06 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
- Sun Mar 10, 2019 8:02 pm
- Forum: Ideal Gases
- Topic: How do I know what is an Ideal Gas
- Replies: 11
- Views: 917
Re: How do I know what is an Ideal Gas
Usually a problem will explicitly mention something as an ideal gas so we most likely won't need to identify it on our own.
- Sun Mar 03, 2019 8:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A: A ferrous wheel:
Fe - Fe
/ \
Fe Fe
\ /
Fe - Fe
A: A ferrous wheel:
Fe - Fe
/ \
Fe Fe
\ /
Fe - Fe
- Sun Mar 03, 2019 8:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Do you have mole problems? If so, call Avogadro at 602-1023
- Sun Mar 03, 2019 8:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Did you hear oxygen went on a date with potassium?
It went OK.
It went OK.
- Sat Feb 23, 2019 5:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
A proton and a neutron were walking down the street. The proton says, "Stop, I dropped an electron. Help me look for it." The neutron asks, "Are you sure?" The proton replies, "Yes, I'm positive."
- Sat Feb 23, 2019 5:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Why was the mole of oxygen molecules excited when he left the singles bar? He got Avogadro's number!
- Sat Feb 23, 2019 5:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
A neutron walks into a shop and says,"I"d like a coke."
The shopkeeper serves up the coke.
"How much will that be?" asks the neutron.
The shopkeeper replies, "For you? No charge."
The shopkeeper serves up the coke.
"How much will that be?" asks the neutron.
The shopkeeper replies, "For you? No charge."
- Sun Feb 17, 2019 10:13 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work done vs work on system
- Replies: 18
- Views: 3824
Re: Work done vs work on system
When work is done on the system, work is positive.
When the system does work, work is negative.
When the system does work, work is negative.
- Sun Feb 17, 2019 10:07 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
- Sun Feb 17, 2019 10:06 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
- Sun Feb 17, 2019 10:05 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
- Sun Feb 17, 2019 10:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
- Sun Feb 17, 2019 10:02 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
A HUG without "U" would be toxic
- Sun Feb 17, 2019 10:00 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Midterm Grades
- Replies: 35
- Views: 2683
Re: Midterm Grades
Probably Wednesday
- Sun Feb 03, 2019 4:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Every dipole has its moment
- Sun Feb 03, 2019 4:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
What is a cation afraid of? A dogion.
- Wed Jan 30, 2019 9:05 am
- Forum: Phase Changes & Related Calculations
- Topic: 101.325 J/(L . atm)
- Replies: 2
- Views: 197
Re: 101.325 J/(L . atm)
Thank you
- Wed Jan 30, 2019 12:18 am
- Forum: Phase Changes & Related Calculations
- Topic: 101.325 J/(L . atm)
- Replies: 2
- Views: 197
101.325 J/(L . atm)
Is 101.325 J/ (L. atm) used to convert L.atm to Joules? Where did this proprotion come from?
- Wed Jan 23, 2019 4:22 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: State property
- Replies: 3
- Views: 318
Re: State property
Any variable that can be measured by subtracting the amount of its initial state from the amount of its final state
- Tue Jan 22, 2019 4:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Salt on Test 1
- Replies: 5
- Views: 354
Re: Salt on Test 1
Thank you
- Mon Jan 21, 2019 5:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Salt on Test 1
- Replies: 5
- Views: 354
Re: Salt on Test 1
How can we identify whether something is a salt?
- Mon Jan 21, 2019 4:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Salt on Test 1
- Replies: 5
- Views: 354
Salt on Test 1
Will we be tested on salts this week?
- Mon Jan 21, 2019 10:42 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp vs Kc
- Replies: 7
- Views: 721
Re: Kp vs Kc
I think so..
- Mon Jan 21, 2019 10:41 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Lecture notes
- Replies: 2
- Views: 915
Re: Lecture notes
The order of the pages are accidently reverse on my post. The last photo is the first page of notes and so on..
- Mon Jan 21, 2019 10:40 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Lecture notes
- Replies: 2
- Views: 915
Re: Lecture notes
These are the notes from Friday 01/18/19
- Mon Jan 21, 2019 10:28 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Did you hear about oxygen’s date with potassium?
It went OK.
It went OK.
- Mon Jan 21, 2019 10:27 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Did you hear the one about cobalt, radon, and yttrium?
It was CoRnY.
It was CoRnY.
- Mon Jan 21, 2019 10:26 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Q: What do you call a wheel made of iron?
A: A ferrous wheel.
A: A ferrous wheel.
- Mon Jan 21, 2019 10:25 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Q: Why do chemists enjoy working with ammonia?
A: Because it's pretty basic stuff.
A: Because it's pretty basic stuff.
- Mon Jan 21, 2019 10:25 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Q: What do you call a tooth in a glass of water?
A: One molar solution.
A: One molar solution.
- Mon Jan 21, 2019 10:24 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe
A: HeHe
- Mon Jan 21, 2019 10:24 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Two chemists go into a restaurant.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" -- and he died.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" -- and he died.
- Fri Jan 18, 2019 6:41 pm
- Forum: Ideal Gases
- Topic: #47 on Chemical Equilibrium 1B Video Module Assessment
- Replies: 3
- Views: 257
Re: #47 on Chemical Equilibrium 1B Video Module Assessment
I got 0.00192 atm, 0.0137 atm, and 0.0237 atm as my answers but they're aren't exactly any of the answer choices listed. Why would my answers be two decimal points off?
- Mon Jan 14, 2019 11:38 pm
- Forum: Ideal Gases
- Topic: #47 on Chemical Equilibrium 1B Video Module Assessment
- Replies: 3
- Views: 257
#47 on Chemical Equilibrium 1B Video Module Assessment
How do you solve for the partial pressures in this problem?
- Mon Jan 14, 2019 12:00 am
- Forum: Student Social/Study Group
- Topic: New to Lavelle
- Replies: 32
- Views: 5232
Re: New to Lavelle
I personally like to go to the UA sessions, AAP peer learning sessions, watch the online modules, and assigned problems from the textbook
- Sun Jan 13, 2019 11:58 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3042849
Re: Post All Chemistry Jokes Here
Wanna hear a joke about potassium? K.
- Sun Jan 13, 2019 10:43 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: HW PROBELM 1 PART D
- Replies: 4
- Views: 459
Re: HW PROBELM 1 PART D
Since Kc is always constant at the same temperature, considering how K is equal to the concentration of products over the concentration of reactants, if we increase [P] then [R] is also increased naturally in order to maintain the same equilibrium constant.
- Wed Jun 13, 2018 12:52 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: French Toast Number 27 Part B
- Replies: 4
- Views: 590
Re: French Toast Number 27 Part B
After doubling the molarity, I still didn't get the right answer.
Molarity= (.550/.21)= 2.62 x 2 = 5.24
and 14 minus the negative log of that doesn't result in the correct answer. I'm not sure what's wrong.
Molarity= (.550/.21)= 2.62 x 2 = 5.24
and 14 minus the negative log of that doesn't result in the correct answer. I'm not sure what's wrong.
- Wed Jun 06, 2018 1:40 am
- Forum: Conjugate Acids & Bases
- Topic: Conjugate acids/bases
- Replies: 1
- Views: 347
Conjugate acids/bases
How do we write the formulas for conjugate acids and bases?
- Wed Jun 06, 2018 1:17 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Problem 17.35 in Textbook
- Replies: 1
- Views: 178
Problem 17.35 in Textbook
How do we determine by looking at the pictures which isomers form chelates?
- Fri May 18, 2018 11:44 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Interaction Energy between ions and molecules [ENDORSED]
- Replies: 1
- Views: 391
Interaction Energy between ions and molecules [ENDORSED]
Why is the interaction energy between ions and molecules always written as a negative value??
- Tue May 15, 2018 11:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to determine molecular shape
- Replies: 5
- Views: 659
How to determine molecular shape
After drawing our molecular models how do we determine its three-dimensional shape?
- Tue May 15, 2018 11:15 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Problem 4.1 in Textbook
- Replies: 1
- Views: 229
Problem 4.1 in Textbook
I don't quite understand how to determine whether there must be, may be, or cannot be lone pairs in a central atom by being given its angle. Can someone explain?
- Fri May 11, 2018 11:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Significant Figures [ENDORSED]
- Replies: 4
- Views: 620
Re: Midterm Significant Figures [ENDORSED]
I was adivised in the past if no significant figures are given within the problems to just use three sig figs in the answer.
- Fri May 11, 2018 11:43 pm
- Forum: Photoelectric Effect
- Topic: Intensity of Photon
- Replies: 8
- Views: 977
Re: Intensity of Photon
Intensity contributes to the # of electrons removed ONLY if the light source has reached the threshold energy. The overall idea is that increasing intensity of light does not increase the energy of emitted electronics.
- Fri May 11, 2018 11:36 pm
- Forum: Trends in The Periodic Table
- Topic: electron affinity [ENDORSED]
- Replies: 15
- Views: 1958
Re: electron affinity [ENDORSED]
I believe electron affinity is the amount of energy released or used when an electron is added to an atom.
- Fri May 11, 2018 11:31 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Px, Py, Pz orbitals
- Replies: 2
- Views: 2588
Re: Px, Py, Pz orbitals
When n=2 l= 0, 1 ml= -1,0,1 The # of ml values are used to represent how many orientations or # of orbitals there can exist. Since there are 3 ml values, this tells us that there are 3 orientations in which the p-orbitals exists. This is denoted by px, py, and pz. Px intersects the x-axis of a three...
- Fri May 11, 2018 11:17 pm
- Forum: Lewis Structures
- Topic: NO
- Replies: 3
- Views: 156
Re: NO
You can add a double bond to the NO structure to stabilize the formal charge, but this wouldn't be resonant to the single bond structure b/c a double would transform the structure completely.
- Fri May 11, 2018 10:56 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Midterm Question
- Replies: 13
- Views: 1349
Re: Midterm Question
The type of orbital (s, p, d, f for instance) will let you know how many orbitals there are within different subshells.
There is 1 orbital for s
3 for p
5 for d
7 for f
There is 1 orbital for s
3 for p
5 for d
7 for f
- Sat May 05, 2018 4:55 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Everyday Objects and heisenberg's equation [ENDORSED]
- Replies: 2
- Views: 439
Everyday Objects and heisenberg's equation [ENDORSED]
Why exactly can't heisenberg's principle be applied to everyday objects?
- Wed May 02, 2018 10:03 pm
- Forum: Student Social/Study Group
- Topic: PRACTICE MIDTERM
- Replies: 1
- Views: 255
PRACTICE MIDTERM
Has the link for the practice midterm been posted yet?
- Fri Apr 27, 2018 9:42 pm
- Forum: DeBroglie Equation
- Topic: does everything have a wavelength
- Replies: 10
- Views: 1480
Re: does everything have a wavelength
Yes everything has a wavelength, but wave properties can only be detected for microscopic particles. The wavelengths of macroscopic objects do exist, but they are regarded to be very small and negligible according to De Broglie's equation. In De Broglie's equation, if you divide Planck's constant by...
- Fri Apr 27, 2018 9:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ATTACHING IMAGES TO POSTS? [ENDORSED]
- Replies: 3
- Views: 626
ATTACHING IMAGES TO POSTS? [ENDORSED]
How exactly do we attach images to posts here on chemistry community?
- Fri Apr 27, 2018 9:34 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Coefficients in electron configurations [ENDORSED]
- Replies: 4
- Views: 3849
Re: Coefficients in electron configurations [ENDORSED]
Essentially, the coefficients that are used in electron configurations are meant to represent the energy level of the orbitals containing the specific number of electrons within a unique periodic element. In this case, The number 4 would indicate the electrons' energy level (n=4) location. The perio...
- Sun Apr 22, 2018 2:39 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Problem 1.15 Textbook
- Replies: 6
- Views: 674
Problem 1.15 Textbook
For this problem would we consider the ultraviolet's energy level of n=1 (Lyman's series) as the final energy level (n, final) or as the initial energy level (n, initial)?
- Sat Apr 21, 2018 11:24 pm
- Forum: DeBroglie Equation
- Topic: Wavelike Properties [ENDORSED]
- Replies: 2
- Views: 300
Wavelike Properties [ENDORSED]
This may seem like an odd question, but why exactly don't macroscopic objects have wavelike properties? What is it about microscopic particles that enables them to have this distinct quality?
- Fri Apr 20, 2018 9:27 pm
- Forum: Photoelectric Effect
- Topic: 1.9
- Replies: 6
- Views: 476
Re: 1.9
multiply (m) by 10^9 to get (nm)
- Fri Apr 20, 2018 9:17 pm
- Forum: DeBroglie Equation
- Topic: HW 1.39 [ENDORSED]
- Replies: 8
- Views: 985
Re: HW 1.39 [ENDORSED]
You would need to use DeBroglie's Equation (wavelength= h/(mass x velocity)) 1) Convert 5.15 ounces to grams (which will be the mass to plug into the equation) 2) Convert mph to meters per second (which will be the velocity to plug into the equation) 3) Plug in all converted variables into Debroglie...
- Fri Apr 20, 2018 9:09 pm
- Forum: Properties of Light
- Topic: amplitude and intensity
- Replies: 11
- Views: 1046
Re: amplitude and intensity
I believe the test will cover up to section 1.5, if I'm not mistaken. Basically, all of the quantum material we've learned up until DeBroglie's Equation.
- Sat Apr 14, 2018 6:07 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric effect module assessment #34B [ENDORSED]
- Replies: 1
- Views: 143
Photoelectric effect module assessment #34B [ENDORSED]
Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 1015 s-1 before it can emit an electron from its surface. I
f molybdenum is irradiated with 194 nm light, what is the maximum possible kinetic energy of the emitted electrons?
How do we solve for this?
f molybdenum is irradiated with 194 nm light, what is the maximum possible kinetic energy of the emitted electrons?
How do we solve for this?
- Sat Apr 14, 2018 3:10 pm
- Forum: Photoelectric Effect
- Topic: E(Photon) greater than/equal to (Energy Remove e-) [ENDORSED]
- Replies: 2
- Views: 165
E(Photon) greater than/equal to (Energy Remove e-) [ENDORSED]
The textbook states, "If the energy of the photon is LESS THAN the energy required to remove an electron from the metal, then an electron will not be ejected, regardless of the intensity of the radiation" (pg 12) and "[electrons will be ejected when the photon energy is greater than t...
- Sat Apr 14, 2018 2:25 pm
- Forum: Photoelectric Effect
- Topic: ENERGY PER MOLE OF PHOTONS [ENDORSED]
- Replies: 3
- Views: 357
ENERGY PER MOLE OF PHOTONS [ENDORSED]
When finding the energy PER MOLE of photons, why does it make sense to multiply by avogadro's number?
- Sat Apr 14, 2018 2:22 pm
- Forum: *Black Body Radiation
- Topic: Importance of Black Bodies?
- Replies: 3
- Views: 663
Importance of Black Bodies?
If idealistically no true black bodies exist in nature, what is the significance of learning about them?
- Sat Apr 14, 2018 12:47 pm
- Forum: *Black Body Radiation
- Topic: Importance of Black Bodies?
- Replies: 2
- Views: 393
Importance of Black Bodies?
If idealistically no true black bodies exist in nature, what is the significance of learning about them?
- Wed Apr 11, 2018 9:43 pm
- Forum: Photoelectric Effect
- Topic: Ejection of electrons in metals
- Replies: 1
- Views: 280
Re: Ejection of electrons in metals
This could be an interesting question to ask for the next lecture since we just barely touched upon this topic.
- Wed Apr 11, 2018 9:38 pm
- Forum: SI Units, Unit Conversions
- Topic: Moles mols mol? [ENDORSED]
- Replies: 21
- Views: 9091
Re: Moles mols mol? [ENDORSED]
Either format is fine. They all mean the same thing.
- Wed Apr 11, 2018 9:14 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular to Empirical [ENDORSED]
- Replies: 12
- Views: 1886
Re: Molecular to Empirical [ENDORSED]
To go from molecular to empirical formula you divide the subscripts of the molecular formula by the greatest common divisor to get the most reduced form of the formula which is essentially the empirical formula.
- Wed Apr 11, 2018 9:08 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs
- Replies: 9
- Views: 1069
Re: Sig Figs
Whether you choose to round or not you should still end up with an answer relatively close to what is correct. I do not think it matters all too much.
- Wed Apr 11, 2018 9:04 pm
- Forum: Properties of Light
- Topic: Clarification on Hz
- Replies: 5
- Views: 334
Re: Clarification on Hz
Hertz is number of cycles per second
- Wed Apr 11, 2018 9:01 pm
- Forum: Limiting Reactant Calculations
- Topic: M9
- Replies: 2
- Views: 248
Re: M9
If I'm not mistaken, I believe the chemical equation should be
Cu(NO3)2 + 2 NaOH ---> Cu(OH)2 + 2 NaNO3
Cu(NO3)2 + 2 NaOH ---> Cu(OH)2 + 2 NaNO3
- Sun Apr 08, 2018 5:19 pm
- Forum: SI Units, Unit Conversions
- Topic: Problem E.9 in textbook
- Replies: 3
- Views: 429
Problem E.9 in textbook
Epsom salts consist of magnesium sulfate heptahydrate.
a) how many atoms of oxygen are in 5.15 g of Epsom salts?
How do we solve this?
a) how many atoms of oxygen are in 5.15 g of Epsom salts?
How do we solve this?