Search found 98 matches
- Tue Mar 17, 2020 5:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
What do you call a tooth in a glass of water? A one molar solution!
- Tue Mar 17, 2020 5:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Carbon and hydrogen went on a date. I heard they really bonded
- Tue Mar 17, 2020 5:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Why does a hamburger have less energy than steak? Because it's in the ground state!
- Tue Mar 17, 2020 5:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Old chemists never die. They just stop reacting
- Tue Mar 17, 2020 5:18 pm
- Forum: Student Social/Study Group
- Topic: Coronavirus Joke
- Replies: 14
- Views: 1817
Re: Coronavirus Joke
hahahahaha thanks for that !
- Tue Mar 17, 2020 5:15 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: Microstates
- Replies: 16
- Views: 1112
Re: Microstates
Nathan Rothschild_2D wrote:They are not the same thing, just related
W=X^n
Where W= Degeneracy, X=the number if possible microstates, n=number of available particles
This is correct, they are two distinct things but they can be related with an equation
- Tue Mar 17, 2020 5:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: What to do if R>P for two equations
- Replies: 4
- Views: 478
Re: What to do if R>P for two equations
Jiyoon_Hwang_2I wrote:You should calculate Q and K and if Q < K then the reaction is product favored and will shift to the right
This is correct you would look at the two reactions individually, and determine Q's value relative to K
- Tue Mar 17, 2020 5:08 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Units for delta G
- Replies: 31
- Views: 2002
Re: Units for delta G
Your units in the end, end up canceling eachother out with the exception of kj which is what you are calculating for deltaG.
- Tue Mar 17, 2020 5:06 pm
- Forum: *Alkanes
- Topic: Alkaline environment
- Replies: 6
- Views: 1355
Re: Alkaline environment
KaleenaJezycki_1I wrote:Why is this??
I also wonder this, I've been researching and googling but there only the conclusions that nothing can survive in a highly alkaline environment, but nowhere it really explains how.
- Tue Mar 17, 2020 4:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final grades
- Replies: 12
- Views: 1088
Re: final grades
In addition to being able to see our grades, does anyone also know if we will be able to review our answers? I would like to see the questions I got wrong. How will we be able to see these? Is he releasing the final exams online? We'll be able to see specifically what we missed because we took the ...
- Tue Mar 17, 2020 4:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grades
- Replies: 6
- Views: 632
Re: Final Grades
The grades will probably be done and posted by the end of this week
- Tue Mar 17, 2020 4:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grades
- Replies: 6
- Views: 632
Re: Final Grades
^^ I agree. The fact that he said he would upload chemistry community grades on thursday I'm assuming means he's going to upload all the other grades too. Especially since the final was multiple choice it shouldn't take long for him to grade and upload Also agree, the final was graded on the spot s...
- Tue Mar 17, 2020 4:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Athena
- Replies: 34
- Views: 3186
Re: Athena
Thank you professor for being quite possibly the most caring and genuine teacher I have ever met. Your determination for students to understand the material and do their best portrays just how much you care for your students !
- Tue Mar 17, 2020 4:52 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3744
Re: Class Grading
This is correct, although the only real curve is that you need 250 points to pass the class with a c-
- Tue Mar 17, 2020 4:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
The proton is not speaking to the other proton, he’s mad atom
- Tue Mar 17, 2020 4:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Two molecules are walking down the street and they run into each other. One says to the other, "Are you all right?"
"No, I lost an electron!"
"Are you sure?" "I'm positive!"
"No, I lost an electron!"
"Are you sure?" "I'm positive!"
- Sun Mar 15, 2020 8:06 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Kelvin or Celsius?
- Replies: 86
- Views: 5724
Re: Kelvin or Celsius?
Use kelvin and make sure your units match up.
- Sun Mar 15, 2020 8:03 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Equations
- Replies: 8
- Views: 569
Re: Equations
I would say there are three main ones, ∆G° = ∆H° - T∆S°and ∆G° = - RT ln K and G=-nFE . All of these are given on the constants sheet, and so being able to derive these equations and manipulate them to find them to your suitable variable you need to calculate is what you will most be needing to do
- Sun Mar 15, 2020 8:01 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: spontaneity
- Replies: 4
- Views: 496
Re: spontaneity
When your deltaG value is negative you will have a spontaneous reaction, when it is positive it will not be. When a reaction is exothermic it is spontaneous, and when is is endothermic it is not. Exothermic reactions have negative deltaG values and endothermic have positive deltaG values. Hope this ...
- Sun Mar 15, 2020 7:58 am
- Forum: Biological Examples (*DNA Structural Transitions, etc.)
- Topic: Examples Expected to Know
- Replies: 15
- Views: 1864
Re: Examples Expected to Know
A typical rule of thumb is to just be aware of the biological examples he gave in lectures, any other examples that he doesnt mention we wont need to memorize or know specifically.
- Sun Mar 15, 2020 7:53 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm 6B
- Replies: 3
- Views: 455
Re: Midterm 6B
For this question since the answer choice a has reactants and products all as solids in the same phase, there will be almost not entropy change.
- Sun Mar 15, 2020 7:51 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Differences
- Replies: 6
- Views: 590
Re: Differences
An open system is a system that freely exchanges energy and matter with its surroundings. A closed system is a system that exchanges only energy with its surroundings, not matter.An isolated system does not exchange energy or matter with its surroundings.
- Sun Mar 15, 2020 7:49 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: isolated system Drawing
- Replies: 4
- Views: 477
Re: isolated system Drawing
An isolated system has energy that remains constant, and is exposed to a constant pressure
- Sun Mar 15, 2020 7:46 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess Law
- Replies: 10
- Views: 1715
Re: Hess Law
ayushibanerjee06 wrote:Yes you add all of them up at the end. If you reverse a reaction, it is negative. You multiply/divide H by whatever you manipulate the reaction. Remember that you can do this because enthalpy is a state function!
This is correct thank you for the clarification.
- Sun Mar 15, 2020 7:45 am
- Forum: Phase Changes & Related Calculations
- Topic: Negative Work
- Replies: 18
- Views: 1489
Re: Negative Work
When work is done b the system against the surrounding the value is negative. When work is being done ON the system by the surrounding such as an increasing external pressure, then work is positive.
- Sun Mar 15, 2020 7:43 am
- Forum: Phase Changes & Related Calculations
- Topic: expansion
- Replies: 5
- Views: 528
Re: expansion
Expansion can be determined if work is done by the system at a constant pressure, so we find that the system expanded against the external pressure.
- Sun Mar 15, 2020 7:41 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Extensive and Intensive Properties
- Replies: 12
- Views: 1053
Re: Extensive and Intensive Properties
Manav Govil 1B wrote:I used https://www.thoughtco.com/intensive-vs- ... ies-604133 when I was studying for my exam.
Thank you for the link, it was very hepful
- Sun Mar 15, 2020 7:40 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: calorimetry
- Replies: 9
- Views: 659
Re: calorimetry
Regular calorimeters is done using a constant pressure, while the difference in bomb calorimeters is that they are done at constant volume.
- Sun Mar 15, 2020 7:38 am
- Forum: Ideal Gases
- Topic: When to use equation
- Replies: 9
- Views: 762
Re: When to use equation
For the ideal gas law it shoudlnt be used for that intended purpose, but for the issue you propose it would be suggested to using the m1v1= m2v2 equation
- Sun Mar 15, 2020 7:34 am
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 4924
Re: Kc vs Kp
Kp is used in the event that you products and reactants all exists in a gas phase. Therefore we use the partial pressures of the gases and make sure the units we use as a result also take that into inclusion. For Kc we use that when we are trying to determine concentration rather than the pressure.
- Sun Mar 15, 2020 7:32 am
- Forum: Ideal Gases
- Topic: Partial Pressure
- Replies: 13
- Views: 753
Re: Partial Pressure
When decreasing the volume of a reaction, you also increase the pressure. Using le chatliers principle we find the reaction will shift towards the side that has fewer moles of gas, which in this reaction is the products as there are only 2 mols of gas compared to three on the reactants side.
- Sun Mar 15, 2020 7:28 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Delta S
- Replies: 8
- Views: 1464
Re: Delta S
The total enthropy is described using the equation total entropy is equal to the entropy of the system and surrounding added to eachother. For tempurature change including entropy we use the equation, deltaG = deltaH - T*deltaS, if our value of deltaG is negative then our reaction is spontaneous, if...
- Sun Mar 15, 2020 7:23 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat released/ gained
- Replies: 22
- Views: 1065
Re: Heat released/ gained
In order for a bond to break there must have a source of energy to break that bond, and so with the formation of bonds because is typically an exothermic reaction, heat is released
- Sun Mar 15, 2020 7:19 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: q=H
- Replies: 4
- Views: 320
Re: q=H
Delta H is equal to q when no work is done onto a system, such as a constant pressure
- Sun Mar 15, 2020 7:15 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy and Heat
- Replies: 4
- Views: 436
Re: Enthalpy and Heat
Enthalpy (ΔH) is the measure of heat released or absorbed at a constant pressure. q is just heat under any conditions. ΔH would be equal to q only when the heat is released or absorbed at a constant pressure. This is the correct answer, another way to think about it is that you can use the two term...
- Sun Mar 15, 2020 7:11 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: calculating delta H for an expansion
- Replies: 3
- Views: 372
Re: calculating delta H for an expansion
You can find the enthalpy by using the standard enthalpies of formation in the back of the textbook. Use equation deltaH = sum of deltaH products - sum of deltaH reactants to find the delta H value. Also a reminder that when using the sum of the deltaH products and reactant it is important to recog...
- Sun Mar 15, 2020 7:08 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Midterm Q6B
- Replies: 5
- Views: 526
Re: Midterm Q6B
The answer is A because we first realize that chnage in gibbs free energy is equal to the change in enthalpy subracted by the product of temperature and the change in entropy or, ∆G= ∆H-T∆S. We also know that ∆G= ∆H when ∆S is approximately 0. Because answer choice has reactants and products all in ...
- Sun Mar 15, 2020 7:04 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Midterm 3B
- Replies: 1
- Views: 268
Re: Midterm 3B
answer choice B is the most concentrated solution thus consisting of the least amount of water of the answer choices. Because water has a high specific heat capacity, meaning it takes more energy to heat, if we want to have the highest temperature change, it would be ideal if we can limit as much wa...
- Sun Mar 15, 2020 6:58 am
- Forum: Ideal Gases
- Topic: T variable in pv=nrt [ENDORSED]
- Replies: 38
- Views: 1716
Re: T variable in pv=nrt [ENDORSED]
Using kelvin is most advisable as it is an easy conversion, and it allows for the matchup of all the right units for your equation.
- Sun Mar 15, 2020 6:56 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction Direction
- Replies: 19
- Views: 1033
Re: Reaction Direction
One way to determine if the reaction will proceed right or left is by comparing to equilibrium value to the reaction quotient value. If your reaction quotient (Q) is less than K than your reactants will continue to react and your reaction will proceed to the right towards the products and vice versa...
- Sun Mar 15, 2020 6:48 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
I’m reading a chemistry book about helium.
I can’t put it down.
I can’t put it down.
- Sun Mar 15, 2020 6:48 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
I know a guy who cooled himself to -273.15C.
He was 0k.
He was 0k.
- Sun Mar 15, 2020 6:46 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Do you know a good chemistry joke?
No sorry, all of them argon
No sorry, all of them argon
- Sun Mar 15, 2020 6:45 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Two atoms are walking down the street. Says one atom to the other, “Hey! I think I lost an electron!”
The other says, “Are you sure?”
“Yes, I’m positive!”
The other says, “Are you sure?”
“Yes, I’m positive!”
- Sun Mar 15, 2020 6:45 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
A neutron walks into a restaurant and orders a couple of drinks. As she is about to leave, she asks the waiter how much she owes. The waiter replies, “For you, No Charge!”
- Sun Mar 15, 2020 6:44 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Man: I wish I was the Enzyme DNA Helicase.
Woman: Why?
Man: So I could unzip your genes.
Woman: Why?
Man: So I could unzip your genes.
- Mon Feb 10, 2020 11:23 pm
- Forum: Phase Changes & Related Calculations
- Topic: Molar Internal Energy
- Replies: 2
- Views: 247
Re: Molar Internal Energy
Thank you
- Mon Feb 10, 2020 8:00 pm
- Forum: Phase Changes & Related Calculations
- Topic: Reversible or Irreversible
- Replies: 5
- Views: 318
Re: Reversible or Irreversible
Yes we would assume it is reversible as most chemical reactions are reversible, usually from the context you can infer from the question such as it stating that the pressure is constant or not constant,
- Mon Feb 10, 2020 7:49 pm
- Forum: Phase Changes & Related Calculations
- Topic: Molar Internal Energy
- Replies: 2
- Views: 247
Molar Internal Energy
Does anybody know if the midterm will be covering molar internal energy with the likeliness of translational and rotational energy ?
- Sun Dec 08, 2019 11:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Representing larger molecules
- Replies: 4
- Views: 426
Re: Representing larger molecules
The atom thats least electronegative should be the central atom, if you have two I would assume it would be best to create the shape by simply drawing the structure according to the appearance in the chemical formula.
- Sun Dec 08, 2019 11:44 pm
- Forum: Hybridization
- Topic: Charges
- Replies: 9
- Views: 1090
Re: Charges
If the molecule or atom has a negative or positive charge it is best to portray so, if it is neutral there is really no need.
- Sun Dec 08, 2019 11:42 pm
- Forum: Naming
- Topic: ion at end of name
- Replies: 4
- Views: 454
Re: ion at end of name
405268063 wrote:Yup, if there are no cations or anions attached to it, you also add "ion" at the end of the name.
THis is correct, if not cations or anions seem to from with it, the ion name will be added
- Sun Dec 08, 2019 11:39 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 7
- Views: 567
Re: Lewis Structures
the least electronegative atom is typically the central molecule. hydrogens will always be on the outside since they can only form one bond. make sure to know specific trends (such as how carbon always wants to make 4 bonds to keep the FC at 0) This is correct, usually the atom thats least electron...
- Sun Dec 08, 2019 11:37 pm
- Forum: Lewis Structures
- Topic: Cl as a central atom
- Replies: 5
- Views: 716
Re: Cl as a central atom
Chlorine is one of the few atoms of which can also break the octet rule allowing it to expand its shells and hold more than 8 electrons
- Sun Dec 08, 2019 11:35 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma Vs Pi
- Replies: 12
- Views: 813
Re: Sigma Vs Pi
Pi bonds occur with double bonded or triple bonded atoms, while sigma bonds occur with single bonds. Sigma bonds are going to be weaker and longer bonds than a pi bond.
- Sun Dec 08, 2019 11:09 pm
- Forum: Properties of Light
- Topic: speed of light and protons
- Replies: 3
- Views: 288
Re: speed of light and protons
For the simple fact that protons of mass, they cannot reach the speed of light, objects with mass cannot travel at the speed of light
- Sun Dec 08, 2019 11:05 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
Helium walks into a bar,
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.
- Sun Dec 08, 2019 11:02 pm
- Forum: General Science Questions
- Topic: Curve
- Replies: 9
- Views: 942
Re: Curve
In order to pass the class you need at least 250/500 points to pass with a C-. The rest of the grades as far as A's and B's I believe will be graded on a curve dependent on the overall/average score of students.
- Sun Dec 08, 2019 10:58 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 367906
Re: Final Jitters
Being able to be in a relaxed state of mind is the best thing you can do for your self, this can be done through reviewing days ahead in advance to avoid cramming and using the last day to do an easy guide over and to relax and have fun, as having fun and laughing is proven to enhance neural pathway...
- Sat Dec 07, 2019 10:08 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9093
Re: Rydberg equation [ENDORSED]
Can someone help me understand why we use the Rydberg equation? The Rydberg equation is used to calculate the energy of an electron at a certain principle quantum level of an atom. We'll usually use it in problems where we're asked to calculate the change in energy, frequency, or velocity that occu...
- Sat Dec 07, 2019 10:01 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarizability
- Replies: 4
- Views: 557
Re: polarizability
London dispersion forces are weaker than the other intermolecular forces and therefore does not exert high polarizability
- Sat Dec 07, 2019 9:55 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelates
- Replies: 5
- Views: 474
Re: Chelates
You would look for ligands that act as polydentate. For example, if the coordination compound has ethylenediamine or en, you would know that it is chelating since en is a bidentate. This is correct, as long as you identify the ligands that have two or more atoms capable of binding to a central meta...
- Sat Dec 07, 2019 9:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand polydentate
- Replies: 4
- Views: 417
Re: Ligand polydentate
I'm not entirely sure, but I think it depends on the lone pairs within a molecule. Like water is a monodentate because it can only bond through oxygen which has 2 sets of lone pairs. With en (ethylenediamine) since it has multiple nitrogens with lone pairs, it is able to bond through multiple site,...
- Sat Dec 07, 2019 9:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelating ligands [ENDORSED]
- Replies: 51
- Views: 98331
Re: chelating ligands [ENDORSED]
Angela Prince 3B wrote:Elizabeth Harty 3A wrote:How do you know if there are sigma bonds available for rotation?
all sigma bonds can rotate, but pi bonds cannot
Thank you for the clarification .
- Sat Dec 07, 2019 9:45 pm
- Forum: Lewis Structures
- Topic: Expanded Octets
- Replies: 2
- Views: 285
Expanded Octets
I know that atoms in group 3 can break the octet rule, but I have also seen similarly that even atoms like Cl can break the octet rule, Is there any other atoms outside of group 3, that can also break the octet rule, and if so is there a certain way to identify why exactly they are able to break the...
- Sat Dec 07, 2019 9:41 pm
- Forum: Lewis Structures
- Topic: Bent or Angular?
- Replies: 18
- Views: 1168
Re: Bent or Angular?
Jamie Lee 1D wrote:Technically they are the same thing so I don't think it matters, you would most likely get a problem correct with either name. Lavelle used bent in his lecture though.
Both terms usually refer to the same thing, correct.
- Sat Dec 07, 2019 9:39 pm
- Forum: Lewis Structures
- Topic: Lewis for carbon monoxide
- Replies: 3
- Views: 1265
Re: Lewis for carbon monoxide
Carbon Monoxide has a total of 10 valence electrons. Carbon having four and Oxygen having six they combine to have 10 total valence electrons. If the carbon and oxygen were double bonded (4 shared electrons), and each had a single pair then you would only have a total of 8 valence electrons. 1 lone ...
- Sat Dec 07, 2019 9:32 pm
- Forum: Octet Exceptions
- Topic: Octet exception
- Replies: 14
- Views: 1287
Re: Octet exception
Elements in the 3p or higher orbital are exceptions to the octet rule. This is because they have an empty d-orbital that allows them to hold more than 8 valence e-, e.g. for P, it is located in the 3p orbital, but has an empty 3d orbital that allows it to hold more than 8 e- and be an exception. Th...
- Sat Dec 07, 2019 9:29 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs. Pi
- Replies: 20
- Views: 1287
Re: Sigma vs. Pi
zachary_nhem_4I wrote:Sigma bonds are stronger because the two orbitals overlap, as opposed to a pi bond where the two orbitals are side by side.
This response is correct as the overlapping of two P orbitals causes the stronger force.
- Sat Dec 07, 2019 9:26 pm
- Forum: Sigma & Pi Bonds
- Topic: pi bonds
- Replies: 8
- Views: 674
Re: pi bonds
Yes any single bond has one sigma bond, a double bond has one sigma and two pi bonds, and a triple bond has 1 pi and two sigma bonds
- Wed Dec 04, 2019 6:26 pm
- Forum: Sigma & Pi Bonds
- Topic: sigma and pi bonds
- Replies: 27
- Views: 1690
Re: sigma and pi bonds
Yes all single bonds are sigma bonds, and double bonds contain one sigma and one pi bond, and a triple bond contains 2 pi bonds and one sigma.
- Wed Dec 04, 2019 6:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to list Chem_Mod posts
- Replies: 25
- Views: 93557
Re: How to list Chem_Mod posts
Thanks for the help !
- Wed Dec 04, 2019 6:23 pm
- Forum: Student Social/Study Group
- Topic: Finals Preparation
- Replies: 7
- Views: 604
Re: Finals Preparation
I think that a good night's sleep is pretty important too. I'd suggest to not stay up super late cramming because that can limit your ability to perform on the test due to lack of sleep. Yeah I've read about how sleep can inhibit cognitive abilities by over 60% over just one bad nights sleep. Thanks
- Wed Dec 04, 2019 6:21 pm
- Forum: Student Social/Study Group
- Topic: Week 10 Chemistry Community
- Replies: 9
- Views: 765
Re: Week 10 Chemistry Community
Sunday is the deadline and we must have 50 posts
- Wed Dec 04, 2019 6:19 pm
- Forum: Student Social/Study Group
- Topic: Practice Final
- Replies: 17
- Views: 1399
Re: Practice Final
If you search for "marshmallow" you will find past exam problems for review
- Wed Dec 04, 2019 6:18 pm
- Forum: Student Social/Study Group
- Topic: Grades
- Replies: 14
- Views: 1001
Re: Grades
On the syllabus it says a 50% is needed to pass with a C- or higher and so I assume thats a curve in and of itself
- Wed Dec 04, 2019 6:16 pm
- Forum: Student Social/Study Group
- Topic: Preparing for the final
- Replies: 25
- Views: 1266
Re: Preparing for the final
I really feel like going to the review sessions helps alot as it helped me greatly and they are very useful
- Wed Dec 04, 2019 6:13 pm
- Forum: Student Social/Study Group
- Topic: Finals Preparation
- Replies: 7
- Views: 604
Re: Finals Preperation
ramiro_romero wrote:Just make sure you eat an apple, glucose molecules will store in your body and fuel your brain ability!
Thats a great idea, thanks for the advice.
- Wed Dec 04, 2019 6:10 pm
- Forum: Student Social/Study Group
- Topic: Finals Preparation
- Replies: 7
- Views: 604
Finals Preparation
Any thoughts/advice as to the best nutritious and energizing breakfasts for sunday morning before the final ?
- Sun Oct 27, 2019 8:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
A conversation between two atoms:
I think I’ve lost an electron.
Are you sure?
Yeah, I’m positive.
I think I’ve lost an electron.
Are you sure?
Yeah, I’m positive.
- Sun Oct 27, 2019 8:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
My teacher threw Sodium Chloride at me. That’s a salt.
- Sun Oct 27, 2019 8:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
“What do you do with a sick chemist?”
“If you can’t helium, and you can’t curium, then you might as well barium.”
“If you can’t helium, and you can’t curium, then you might as well barium.”
- Sun Oct 27, 2019 8:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3622439
Re: Post All Chemistry Jokes Here
helium walks into a bar and orders a beer. The bartender says, “Sorry, we don’t serve noble gases here.” He doesn’t react
- Sun Oct 20, 2019 11:12 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 7399
Re: Advice for studying
Alexis 3F wrote:I've been attending the workshops a few times a week and it's made suchhhh a positive improvement!!!!
I also found this to be super helpful
- Sun Oct 20, 2019 11:10 pm
- Forum: Properties of Electrons
- Topic: Angstrom Conversion
- Replies: 12
- Views: 472
Re: Angstrom Conversion
905416023 wrote:It is 1 angstrom to 10^-10 m
correct answer
- Sun Oct 20, 2019 11:04 pm
- Forum: Properties of Light
- Topic: What are the units of hertz
- Replies: 41
- Views: 2129
Re: What are the units of hertz
nicolely3B wrote:Hz is the unit for 1 cycle/second. The cycle refers to a wave's cycle and it's from the peak of one wave to the trough of the next
perfect explanation
- Sun Oct 20, 2019 10:59 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 151037
Re: Reading the textbook
reading the textbook is an obvious super helpful tool, to better go in depth as to what you are learning and practice.
- Sun Oct 20, 2019 10:57 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent
- Replies: 32
- Views: 43757
Re: Ionic vs Covalent
Typically, ionic bonds are stronger but there are exceptions such as weakened ionic bonds as water as well as special strengthened covalent bonds known as covalent network bonding.
- Sun Oct 13, 2019 10:04 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 151037
Re: Reading the textbook
I used these for my AP Chemistry class in high school, but I think they have some college-level chem as well: https://chem.libretexts.org/ https://www.youtube.com/channel/UCEWpbFLzoYGPfuWUMFPSaoA https://www.youtube.com/watch?v=IFKnq9QM6_A&list=PLJfwA7_CzYE_qLSXH2hJkpffcrc76NjHJ Hope this helps...
- Sun Oct 13, 2019 10:02 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength Plausibility
- Replies: 31
- Views: 2697
Re: Wavelength Plausibility
madeleine_dis1E wrote:Yes, the 700-400nm example he gave is meant to provide a mental picture of the range however the actual scale is from 720-400. Either way you want to remember it is ok.
correct, 700 is just used for an easier conceptualization of the actual range
- Sun Oct 13, 2019 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
- Replies: 53
- Views: 5963
Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
great tool and resource to help review and further cement the fundamentals of each topic covered in class !
- Sun Oct 13, 2019 9:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7755
Re: Week 2 Homework Problems [ENDORSED]
You have the option of either doing more problems from week 1 of Chem review or the quantam world
- Sun Oct 13, 2019 9:38 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 21582
Re: Test 1 [ENDORSED]
I don't know if someone has asked this already but would we get partial credit for unfinished problems headed in the right direction? I was also wondering this as, I was also curious as to how far off of an answer would grant us the maximum amount of points ie. our answer is 8.4 whereas the actual ...
- Sun Oct 06, 2019 10:13 pm
- Forum: Limiting Reactant Calculations
- Topic: Steps to Finding the Limiting Reactant
- Replies: 3
- Views: 377
Re: Steps to Finding the Limiting Reactant
You only need to use the molar mass of one reactant to find the product, so you can keep the molar masses of the products separated. First, convert the grams given of a particular reactant to moles. Then, use the molar ratio of the balanced equation to determine how much of a particular product is ...
- Sun Oct 06, 2019 10:07 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical vs. Actual Yield
- Replies: 38
- Views: 14075
Re: Theoretical vs. Actual Yield
Actual yields will be less than theoretical yields due to side reactions that can occur, some products could stick to the sides of the reaction container, and impurities that are bound to happen during almost all chemical reactions. Hope this was helpful/answered your question! exactly ! There are ...
- Sun Oct 06, 2019 10:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 267925
Re: Advice from a Medical Student - Part II [ENDORSED]
Great and awesome to hear that you still think about and take time to give advice to students of a teacher you had so long ago. We all appreciate the advice and good luck to you and all your endeavours .
- Sun Oct 06, 2019 9:58 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 367906
Re: Final Jitters
I think the best way to relax and get rid of the nerves is to just close your eyes and breathe, just focus on good and positive memories and experiences will enhance your mood making you happier, the happier you are the more willing you are to focus and do something, it will also help clear your min...
- Sun Oct 06, 2019 9:53 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Fig Mistakes
- Replies: 17
- Views: 873
Re: Sig Fig Mistakes
Typically the amount of significant figures used for your answer is determined by the amount gaven to you in the question. Usually it follows these rules
any non-zero digits are always significant.
Any zeros between two significant digits are still significant.
any non-zero digits are always significant.
Any zeros between two significant digits are still significant.