Search found 51 matches
- Sat Mar 16, 2019 4:20 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Monoatomic Gas
- Replies: 3
- Views: 664
Re: Monoatomic Gas
I believe Lavelle once said in class before a test or the midterm to assume all gases are monoatomic unless told otherwise, is this still true for the final ?
- Sat Mar 16, 2019 4:18 pm
- Forum: Balancing Redox Reactions
- Topic: multiplying half reactions [ENDORSED]
- Replies: 4
- Views: 4409
Re: multiplying half reactions [ENDORSED]
I think the only case you would multiply it by something is when you want to flip the reaction so you would multiply the cell potential by negative 1.
- Sat Mar 16, 2019 4:15 pm
- Forum: Experimental Details
- Topic: Rate law in multiple step reactions [ENDORSED]
- Replies: 3
- Views: 1205
Re: Rate law in multiple step reactions [ENDORSED]
so the overall rate law is dependent on its slowest step, so it is always going to be the determinate in the overall rate. To help remember this, I relate this to the quote "you are only as strong as your weakest link" meaning the reaction is only as fast as its slowest step.
- Sat Mar 16, 2019 4:11 pm
- Forum: Experimental Details
- Topic: Collision Theory
- Replies: 8
- Views: 1304
Re: Collision Theory
As long as you understand that collision is necessary for reactions to continue, molecules need to break apart and form and with and increase in temperature this will happen more I think you should be okay.
- Sat Mar 16, 2019 4:08 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH on final
- Replies: 5
- Views: 1452
Re: pH on final
I feel like the final will include questions that involve PH but are not specifically only PH questions, they will be a combination of multiple topics similar to #5 on test 2
- Sat Mar 16, 2019 4:06 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Test 1 problem 5
- Replies: 6
- Views: 803
Re: Test 1 problem 5
How would you go about this problem I had some trouble understanding it
- Sat Mar 16, 2019 4:03 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Increasing/Decreasing temp
- Replies: 8
- Views: 1122
Re: Increasing/Decreasing temp
depending on if the reaction is endo or exothermic, it will change the way the reaction proceeds and which direction is most favorable.
- Thu Mar 14, 2019 1:04 pm
- Forum: First Order Reactions
- Topic: 7B.9
- Replies: 2
- Views: 385
Re: 7B.9
the mistake is more likely in your unit conversions, I would just double check those.
- Thu Mar 14, 2019 12:40 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Determining Catalysts from Diagrams (7E.5)
- Replies: 3
- Views: 508
Re: Determining Catalysts from Diagrams (7E.5)
The catalyst is used up first then later recreated while an intermediate is first created/produced then used up and not in the final product and this is how you would tell the difference I think.
- Thu Mar 14, 2019 1:18 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Units of k
- Replies: 7
- Views: 1060
Re: Units of k
The units of k will change depending on the order of the reaction so it is important to know which order your reaction is to have the correct units
- Thu Mar 14, 2019 1:17 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: mmol vs mol
- Replies: 6
- Views: 1072
Re: mmol vs mol
as long as your conversions are correct and you give the answer in the correct units (if explicitly asked) then that is the only time it really matters
- Thu Mar 14, 2019 1:15 am
- Forum: General Rate Laws
- Topic: slow step
- Replies: 11
- Views: 1430
Re: slow step
why is it important to know which step is the slower or the faster one? is it just to ensure that the k values are correct and accurate ?
- Thu Mar 14, 2019 1:13 am
- Forum: *Enzyme Kinetics
- Topic: Adsorption
- Replies: 13
- Views: 3182
Re: Adsorption
I feel like as long you understand and can picture the situation when given an adsorption problem you shouldn't have to worry too much.
- Thu Mar 14, 2019 1:12 am
- Forum: *Enzyme Kinetics
- Topic: Adsorption
- Replies: 13
- Views: 3182
Re: Adsorption
I think it would matter only in understanding what is happening to the reactant, it would be steeping into the catalyst instead of the catalyst taking in the reactant? I am not sure though
- Thu Mar 14, 2019 1:09 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: What is an intermediate?
- Replies: 3
- Views: 414
Re: What is an intermediate?
An intermediate is part of the elementary steps of a rxn, meaning it is part of the reactions of a part of the reaction then cancelled/used up in the following step and is not seen in the final overall reaction
- Thu Mar 14, 2019 1:07 am
- Forum: *Enzyme Kinetics
- Topic: true statement?
- Replies: 4
- Views: 771
Re: true statement?
the way I think of this, just to be quick is the higher the temp. the more collisions within the reaction meaning it will react at a faster rate. so the statement is true in this context
- Thu Mar 14, 2019 1:05 am
- Forum: Experimental Details
- Topic: Pre Equilibruim Approach
- Replies: 6
- Views: 1724
Re: Pre Equilibruim Approach
Destiny Diaz 4D wrote:would we be specifically asked to solve using the pre equilibrium approach?
I feel like based on the question and what is given you would determine this, but I wanted to ask to be sure?
- Thu Mar 14, 2019 1:05 am
- Forum: Experimental Details
- Topic: Pre Equilibruim Approach
- Replies: 6
- Views: 1724
Re: Pre Equilibruim Approach
would we be specifically asked to solve using the pre equilibrium approach?
- Thu Mar 14, 2019 1:03 am
- Forum: Zero Order Reactions
- Topic: Integration/Derivation
- Replies: 3
- Views: 542
Re: Integration/Derivation
I think as long as you know where the equations come from and how they are related you should be good.
- Tue Mar 05, 2019 7:32 pm
- Forum: General Rate Laws
- Topic: Derivatives
- Replies: 5
- Views: 572
Re: Derivatives
I wouldn't say you need to know how to do integrals and derivatives but just understanding how these equations derive would be helpful
- Tue Mar 05, 2019 7:27 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Delta n
- Replies: 7
- Views: 1275
Re: Delta n
LeannaPhan14BDis1D wrote:Destiny Diaz 4D wrote:so to find delta n you would take the moles from products subtracted from moles from reactants?
yes i think so?
I think that makes sense lol thank you
- Tue Mar 05, 2019 7:25 pm
- Forum: Zero Order Reactions
- Topic: Units of k
- Replies: 12
- Views: 2124
Re: Units of k
There might be questions that ask to derive 3+ order equations but I doubt we will be asked to do much with them at all.
- Tue Mar 05, 2019 7:22 pm
- Forum: Zero Order Reactions
- Topic: Half life
- Replies: 5
- Views: 583
Re: Half life
The half life equation for a zero order reaction is [A0]/2k
- Tue Mar 05, 2019 7:19 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneity
- Replies: 6
- Views: 708
Re: Spontaneity
I am not sure if this chart is helpful to you but here it is just in case
- Tue Mar 05, 2019 7:15 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Determining Spontaneity
- Replies: 7
- Views: 986
Re: Determining Spontaneity
Here is a chart that helps understand the relationship
- Tue Mar 05, 2019 7:10 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Determining Spontaneity
- Replies: 7
- Views: 986
Re: Determining Spontaneity
Spontaneity is dependent on delta S and delta H so you cant assume the rxn is spontaneous
- Tue Mar 05, 2019 6:55 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Delta n
- Replies: 7
- Views: 1275
Re: Delta n
so to find delta n you would take the moles from products subtracted from moles from reactants?
- Tue Mar 05, 2019 6:44 pm
- Forum: Phase Changes & Related Calculations
- Topic: ISOBARIC
- Replies: 3
- Views: 415
ISOBARIC
Will we normally be given the pressure of an isobaric reaction in atm ? or will we need to be able to convert?
- Tue Mar 05, 2019 6:41 pm
- Forum: Phase Changes & Related Calculations
- Topic: ΔH vs ΔU?
- Replies: 8
- Views: 1402
Re: ΔH vs ΔU?
When enthalpy is given I would not say it is safe to assume that pressure is constant, unless other wise stated.
- Sat Dec 08, 2018 12:50 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test Keys [ENDORSED]
- Replies: 2
- Views: 547
Re: Test Keys [ENDORSED]
Thank you :)
- Fri Dec 07, 2018 11:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Keys [ENDORSED]
- Replies: 2
- Views: 547
Test Keys [ENDORSED]
Does anyone know where the keys to test 1-3 can be found if they are available? I reviewing and would like they keys for reference
- Fri Dec 07, 2018 11:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21571
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thank you for your help ! When will the answers be posted ? :)
- Tue Nov 27, 2018 11:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs. Non-polar
- Replies: 6
- Views: 639
Re: Polar vs. Non-polar
How would you find the dipoles in this case ?
- Tue Nov 20, 2018 8:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW help 6th edition 4.23
- Replies: 1
- Views: 181
HW help 6th edition 4.23
I am wondering why in the lewis structures for a) OSbCl3 and b) SO2CL2 the answer key shows O as not having a double bond with their central atoms, essentially with or without the double bond the shapes are still tetrahedral but I am curious why the lewis structures are written this way when a doubl...
- Tue Nov 20, 2018 7:50 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Atom Distance, repulsion?
- Replies: 6
- Views: 909
Re: Atom Distance, repulsion?
I am not exactly sure how the repulsion would impact the bond length, for general understanding though the electrons are negatively charged therefore need to be as far away from each other and if it is a lone pair they have a stronger repulsion changing the shape of the molecule.
- Tue Nov 20, 2018 7:35 pm
- Forum: Hybridization
- Topic: Unhybridized orbitals
- Replies: 10
- Views: 1426
Re: Unhybridized orbitals
I was also confused on the concept of unhybridized orbitals, I am wondering if the hybridization changed the shape of the molecule? Or would it only be impacting the sp formula and if so how?
- Tue Nov 20, 2018 7:31 pm
- Forum: Hybridization
- Topic: Why is (CH3)2Be is sp? [ENDORSED]
- Replies: 8
- Views: 6693
Re: Why is (CH3)2Be is sp? [ENDORSED]
Please read things carefully. The solution manual says the shape is a tetrahedral about the carbon atoms . However, as a whole, the molecule is linear. Meaning with respect to the central Be atom in (CH 3 ) 2 Be. So to better understand, if the question were to ask of the shape in respect to the ca...
- Mon Nov 19, 2018 1:29 pm
- Forum: Hybridization
- Topic: Sigma/Pi bonds
- Replies: 6
- Views: 867
Re: Sigma/Pi bonds
Niveda_B_3I wrote:Also, it's good to know that:
single bond - one sigma
double bond - one sigma, one pi
triple bond - one sigma, two pi
etc.
I am not sure if this question makes sense but are the sigma and pi bonds correlated to the type of bond like covalent or ionic bonds?
- Tue Nov 13, 2018 10:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: ClO2+
- Replies: 7
- Views: 1636
Re: ClO2+
Destiny Diaz 4D wrote:I understood the shape to be angular from the solutions but I don't understand why.
I believe that because the steric number is four and since there are two lone pairs then the shape is angular but I still am slightly confused.
- Tue Nov 13, 2018 10:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: ClO2+
- Replies: 7
- Views: 1636
Re: ClO2+
I understood the shape to be angular from the solutions but I don't understand why.
- Tue Nov 13, 2018 10:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Chapter 4 Homework Number 1
- Replies: 6
- Views: 483
Re: Chapter 4 Homework Number 1
can you explain this in terms of the homework problem 4.1, I am still somewhat confused as to why the bond must have lone pairs.
- Tue Nov 06, 2018 6:59 pm
- Forum: Lewis Structures
- Topic: Identifying the element
- Replies: 8
- Views: 953
Re: Identifying the element
Yes, mentioning stable structure and formal charge (how it equals to 0) would be the correct answer for the reasoning. If the formal charge doesn't equal 0, then it probably wouldn't be the correct element. I agree, I think as long as you support your answer scientifically with the formal charge an...
- Tue Nov 06, 2018 6:47 pm
- Forum: Lewis Structures
- Topic: Identifying the element
- Replies: 8
- Views: 953
Re: Identifying the element
Yes, mentioning stable structure and formal charge (how it equals to 0) would be the correct answer for the reasoning. If the formal charge doesn't equal 0, then it probably wouldn't be the correct element. I agree, I think as long as you support your answer scientifically with the formal charge an...
- Tue Nov 06, 2018 6:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Length
- Replies: 8
- Views: 627
Re: Bond Length
Destiny Diaz 4D wrote:How would you determine if all the bond lengths in a structure are the same?
or does that depend on the type of bond ?
- Tue Nov 06, 2018 6:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Length
- Replies: 8
- Views: 627
Re: Bond Length
How would you determine if all the bond lengths in a structure are the same?
- Tue Nov 06, 2018 6:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: 3.19 (6th edition)
- Replies: 4
- Views: 386
Re: 3.19 (6th edition)
Your work is correct from my understanding, I also got two unpaired electrons for this problem.
- Tue Oct 23, 2018 8:47 pm
- Forum: DeBroglie Equation
- Topic: HW Help 1.25
- Replies: 4
- Views: 569
Re: HW Help 1.25
jguiman4H wrote:Essentially, your set up would look like this: E = (5.00 x 10-3 g Na) (1 mol Na / 22.99 g Na) (6.022 x 1023 atoms/mol) (3.37 x 10-19 J/atom) = 44.1 J
The 3.37 x 10-19 J/atom comes from your answer in part a. Hope this helps!
Yes thank you <3
- Tue Oct 23, 2018 7:29 pm
- Forum: DeBroglie Equation
- Topic: HW Help 1.25
- Replies: 4
- Views: 569
Re: HW Help 1.25
I followed the process suggested and am not getting the answer offered in the solutions from the book, my answer is off by a few decimal points and was wondering if you could break down the process a bit more just so I can understand conceptually. Thank you so much <3
- Tue Oct 23, 2018 6:52 pm
- Forum: Properties of Light
- Topic: Test 2 Equations
- Replies: 14
- Views: 1091
Re: Test 2 Equations
My TA basically went over a lot of what is covered in chapter one, stating that that is what the test will be on mainly. which was concepts of wavelength, frequency, energy, the photoelectric effect, and quantum numbers. I think if you review these concepts and their equations you should be okay for...
- Tue Oct 16, 2018 8:49 pm
- Forum: *Black Body Radiation
- Topic: Question 1.21
- Replies: 5
- Views: 2368
Re: Question 1.21
I'm curious to know how the black body radiation helps to understand the properties of the electromagnetic radiation, I understand what it is but don't know how to support the properties of the radiation through this.
- Wed Oct 10, 2018 12:02 am
- Forum: Significant Figures
- Topic: Test 1
- Replies: 3
- Views: 513
Test 1
For the first test, are we expected to memorizes things like Avogrados Constant or will they be given?