http://www.chemistryjokes.com/images/th ... fusion.jpg
Me during that entire final
Search found 52 matches
- Mon Mar 19, 2018 12:50 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3901153
- Mon Mar 19, 2018 12:46 am
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 11
- Views: 2102
Re: Final
In that case would there have been a couple different ways to set up that equation, cause I feel like what I did was right, but it was a different set up from what one of my friends did.
- Sun Mar 18, 2018 2:43 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 11
- Views: 2102
Re: Final
What did people say for the True and False questions. Specifically the one of macrostates of molecules
- Sun Mar 18, 2018 2:41 pm
- Forum: Balancing Redox Reactions
- Topic: Winter 2013 final Q4
- Replies: 9
- Views: 1183
Re: Winter 2013 final Q4
How do you find these old finals?
- Sun Mar 18, 2018 2:39 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff
- Replies: 9
- Views: 1178
Re: Van't Hoff
I actually learned to calculate this and turned out it wasn’t on the final. But it’s good to know the concepts.
- Sun Mar 18, 2018 2:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 626394
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle!!
- Sun Mar 18, 2018 2:38 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 11
- Views: 2102
Re: Final
Not sure how I feel about that test
- Sun Mar 18, 2018 10:44 am
- Forum: First Order Reactions
- Topic: k' in Pseudo-First-Order Rate Laws
- Replies: 4
- Views: 1561
Re: k' in Pseudo-First-Order Rate Laws
How do we know when to use a pseudo-first-order method instead of calculating the second order rate law normally?
- Sun Mar 18, 2018 10:39 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: >> [ENDORSED]
- Replies: 2
- Views: 723
Re: >> [ENDORSED]
I agree with Nora^^ It's usually used to define exponential inequalities
- Sun Mar 18, 2018 10:37 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy Temperature Dependence
- Replies: 5
- Views: 1197
Re: Activation Energy Temperature Dependence
I'm pretty certain that the variable A is also defined as the frequency factor.
- Sun Mar 18, 2018 10:30 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Putting an Ice cube into a glass of water
- Replies: 4
- Views: 1403
Putting an Ice cube into a glass of water
Why don't we factor in the delta H of fusion into our calculation of the final temperature of water in these problems? Wouldn't some heat energy be lost in melting the ice cube or am I just overthinking the problem?
- Fri Mar 16, 2018 8:28 pm
- Forum: *Enzyme Kinetics
- Topic: Kinetics and Enzymes
- Replies: 7
- Views: 1281
Re: Kinetics and Enzymes
Would we need to know calculations related specifically to enzymes for the final or will we only need to know conceptual material?
- Fri Mar 16, 2018 8:26 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Split of questions on the final
- Replies: 3
- Views: 667
Split of questions on the final
What is the split of questions on the final? Relatively how much of the final will be on older material (like Enthalpy and Entropy) and how much of the final will be on the newer material??
- Wed Mar 14, 2018 3:48 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: hw #15.63
- Replies: 1
- Views: 384
Re: hw #15.63
You would start with the equation: ln(k 2 /k1 1 ) = E a /R * ((1/T 1 ) - (1/T 2 )) Where T 1 = 25 Degrees Celsius = 298 K Where T 2 = 37 Degrees Celsius = 310 K Where k 1 = 1.5 * 10^10 and you need to find k 2 So after computing this equation and making sure that you convert the value for R from J i...
- Wed Mar 14, 2018 3:38 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: adiabatic process
- Replies: 5
- Views: 857
Re: adiabatic process
What kind of questions would we get asked on the final about adiabatic processes, would they all just be conceptual? Will the topic be on the final?
- Wed Mar 14, 2018 3:33 pm
- Forum: Environment, Ozone, CFCs
- Topic: radical chain reaction
- Replies: 2
- Views: 2724
Re: radical chain reaction
The Syllabus told us to omit section 15.9 from our readings and there weren't any hw problems assigned on radical chain reactions. So to what extent do we need to know about radical chain reactions on the final? Would we just need to know the concept? Or is there anything else involved?
- Wed Mar 14, 2018 3:30 pm
- Forum: First Order Reactions
- Topic: Determining Reaction Order
- Replies: 5
- Views: 928
Re: Determining Reaction Order
To determine reaction order you would add the coefficients of the concentrations in the Rate law. For example, if the rate law = k[A]^2 * [B]:
The Reaction is Second-Order in terms of A, First-Order in terms of B, and (2+1) Third-Order overall.
The Reaction is Second-Order in terms of A, First-Order in terms of B, and (2+1) Third-Order overall.
- Thu Mar 08, 2018 10:24 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Self-Test 15.4B
- Replies: 1
- Views: 491
Re: Self-Test 15.4B
If the value is not an integer then the units of k are proportional to the fraction. For example, if the reaction order is 3/2 then, the units of k would be L^1/2 * mol^(-1/2) * s^-1. The overall intention is to end up with the rate in (mol * L^-1 * s^-1), so you would modify the units of k to get t...
- Tue Mar 06, 2018 7:03 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Integrated Rate Law
- Replies: 2
- Views: 534
Re: Integrated Rate Law
The specific integrate rate laws that we have found are integrated using the rate of loss of reactants. The short answer to your question is yes. However, there could be problems (similar to #23 (part c)) where you are given the concentration of the product and the molar ratio of products to reactan...
- Tue Mar 06, 2018 4:24 pm
- Forum: First Order Reactions
- Topic: 15.23
- Replies: 6
- Views: 851
Re: 15.23
how do you get rid of the negative?? You get rid of the negative by flipping the natural log... Use the laws of logs and remember that ln[At]/[Ai] = ln[At] - ln[Ai], so if you bring the negative to the other side, you turn that into ln[Ai] - ln[At] = ln[Ai]/[At] This is why you get: t = 1/k * ln[Ai...
- Tue Mar 06, 2018 4:17 pm
- Forum: Second Order Reactions
- Topic: Half-lives
- Replies: 2
- Views: 572
Re: Half-lives
Apart from what Remi said, the main reason you need to use the integrate rate laws instead of the logarithmic shortcut is because the rate of change in the concentrations of the reactants follows a curve which isn't depicted in the half-life formula. We find the half-life as ln2/k, but the only reas...
- Mon Mar 05, 2018 4:58 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Units of k
- Replies: 8
- Views: 1442
Re: Units of k
What is the best way to convert between different units of k? Would we ever have to convert k from L/ mol*s, into 1/ kPa*s?
- Mon Mar 05, 2018 4:54 pm
- Forum: Second Order Reactions
- Topic: Limiting Step
- Replies: 7
- Views: 1130
Re: Limiting Step
Do we have to know how to calculate the limiting step for test 3? Which hw problems focus on the limiting step?
- Mon Mar 05, 2018 4:49 pm
- Forum: General Rate Laws
- Topic: 3rd order, 4th order, etc.
- Replies: 5
- Views: 1920
Re: 3rd order, 4th order, etc.
Could someone give some examples of a 3rd or 4th order reaction that we might see on a test? I've only seen 1st and 2nd order reactions in the textbook really.
- Mon Mar 05, 2018 4:46 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: K'
- Replies: 7
- Views: 924
Re: K'
Could someone explain what methods you would use to find k' in a pseudo reaction?
- Mon Mar 05, 2018 4:43 pm
- Forum: General Rate Laws
- Topic: Are there any textbook problems involving pseudo reactions?
- Replies: 1
- Views: 412
Re: Are there any textbook problems involving pseudo reactions?
I didn't find any in the textbook, but this website has some pretty good practice questions at the end.
https://chem.libretexts.org/Core/Physic ... _reactions
https://chem.libretexts.org/Core/Physic ... _reactions
- Mon Mar 05, 2018 4:36 pm
- Forum: General Rate Laws
- Topic: Test #3 Problems
- Replies: 3
- Views: 558
Re: Test #3 Problems
To what extent do we need to know/ be able to draw graphs for the different reaction orders?
- Sun Jan 28, 2018 5:14 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Self-Test 9.2 B
- Replies: 2
- Views: 341
Re: Self-Test 9.2 B
This is a great question! I was lowkey confused about this too. The easiest way to know is based on the units that they give you and the units you want to end up with. You know that you want the entropy, which is in J/K... But the specific heat capacity value that they give you is in J/C*g. The only...
- Thu Jan 25, 2018 2:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.65
- Replies: 6
- Views: 714
Re: 8.65
In the solutions manual, they say that "the reaction we want is" N2 + 5/2 O2 ----> N2O5
I'm not sure where they got the reaction from. Also is there a similar example to this in the textbook, because I'm not sure what method to use to solve this.
I'm not sure where they got the reaction from. Also is there a similar example to this in the textbook, because I'm not sure what method to use to solve this.
- Tue Jan 09, 2018 11:45 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Book 8.11 [ENDORSED]
- Replies: 5
- Views: 472
Re: Book 8.11 [ENDORSED]
Is there a difference between enthalpy and molar enthalpy?? How would you covert one to the other?
- Mon Dec 11, 2017 2:27 am
- Forum: Bronsted Acids & Bases
- Topic: Strong Acids and Bases [ENDORSED]
- Replies: 3
- Views: 853
Re: Strong Acids and Bases [ENDORSED]
So if you are just given the grams of a strong acid and the volume of the solution, how would you calculate the pH of the solution??
- Mon Dec 11, 2017 2:24 am
- Forum: Student Social/Study Group
- Topic: final test back
- Replies: 2
- Views: 829
Re: final test back
I feel like they would just keep it for you until you are able to pick it up...
- Mon Dec 11, 2017 2:23 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3901153
Re: Post All Chemistry Jokes Here
This thread is actual gold...
- Sun Dec 03, 2017 4:41 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Trend in Acidity [ENDORSED]
- Replies: 3
- Views: 684
Re: Trend in Acidity [ENDORSED]
Will we be given pKa values? Or will we need to memorize/calculate them??
- Sun Dec 03, 2017 4:39 pm
- Forum: Lewis Acids & Bases
- Topic: H+ as Lewis acid/base [ENDORSED]
- Replies: 2
- Views: 2843
H+ as Lewis acid/base [ENDORSED]
When H+ is transferred in a reaction, is it concerted a bronsted or Lewis acid/base reaction? Is H+ always considered a Lewis acid?
- Tue Nov 28, 2017 4:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.41
- Replies: 2
- Views: 459
Re: 11.41
I was confused about the same problem... Why do they give you the amount of ammonium carbamate and the temperature? Is there an alternate way of solving the problem that uses those two quantities??
- Tue Nov 21, 2017 2:57 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole Moments
- Replies: 1
- Views: 209
Dipole Moments
When drawing dipole moments are we supposed to use the original convention or the "modern convention" that is used in the textbook? The original convention points the arrow towards the more electronegative (negative charged) element, whereas the modern convention points the arrow towards t...
- Sun Nov 19, 2017 6:57 pm
- Forum: Hybridization
- Topic: how do you find the hybridization [ENDORSED]
- Replies: 2
- Views: 664
Re: how do you find the hybridization [ENDORSED]
Here's a great chart which might help you. http://web.gccaz.edu/~chriy68124/VSEPR%20handout.pdf
- Sun Nov 19, 2017 6:44 pm
- Forum: Hybridization
- Topic: Electron density question
- Replies: 4
- Views: 776
Re: Electron density question
Yeah it does! Here's a helpful chart http://web.gccaz.edu/~chriy68124/VSEPR%20handout.pdf
Also, remember that you can use the AXE format to decipher the VSEPR geometric shape...
Also, remember that you can use the AXE format to decipher the VSEPR geometric shape...
- Mon Nov 13, 2017 12:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Question 4.29 [ENDORSED]
- Replies: 3
- Views: 1818
Re: Question 4.29 [ENDORSED]
What method do we use to name the isomers as 1-, 1-3, and 1-4?
- Mon Nov 06, 2017 12:01 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation States: How to derive [ENDORSED]
- Replies: 3
- Views: 776
Oxidation States: How to derive [ENDORSED]
In question number 23, Chapter 3, the textbook asks us to find the maximum positive and negative oxidation numbers for Chlorine. I think I'm just confused on the general method for deriving the maximum oxidation numbers. How do we figure out what the maximum oxidation numbers would be??
- Sun Nov 05, 2017 12:56 am
- Forum: Ionic & Covalent Bonds
- Topic: The use of hidden d orbital
- Replies: 2
- Views: 544
Re: The use of hidden d orbital
You would use up the d orbital of the highest energy level. For example in Sulfur, since you already have electrons in the 3s and 3p orbitals, you can also fill the 3d orbital with electrons... Recall how in the last chapter we looked at quantum numbers and if n=3, l = 0,1,2; thus any atom with n=3 ...
- Tue Oct 31, 2017 11:22 am
- Forum: Octet Exceptions
- Topic: F orbitals
- Replies: 4
- Views: 751
F orbitals
When do f orbitals come into play when considering chemical bonds and lewis structures? In the same way that atoms can fill up their d orbitals, can even larger atoms fill up their f orbitals too??
- Tue Oct 31, 2017 11:20 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: How to figure out formal charge? [ENDORSED]
- Replies: 6
- Views: 1896
Re: How to figure out formal charge? [ENDORSED]
Also make sure that you memorize the equation or know the concept behind calculating formal charge, because Dr. Lavelle said that he won't provide the equation on the reference sheet!!
- Tue Oct 31, 2017 11:17 am
- Forum: Lewis Structures
- Topic: Homework 3.71 [ENDORSED]
- Replies: 3
- Views: 598
Re: Homework 3.71 [ENDORSED]
Also, yes, the most dominant and stable resonance structure will be the one with the lowest energy, which means that it will have a formal charge closest to 0...
- Tue Oct 31, 2017 11:16 am
- Forum: Lewis Structures
- Topic: Homework 3.71 [ENDORSED]
- Replies: 3
- Views: 598
Re: Homework 3.71 [ENDORSED]
Remember to use the equation, Fc = V - (L + s/2), where V = the number of valence electrons, L = the number of lone electrons, s= the number of shared electrons to calculate the formal charge of each atom in the molecule!!
- Tue Oct 31, 2017 11:14 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Understadning Heisenberg Indeterminacy Equation
- Replies: 6
- Views: 1377
Re: Understadning Heisenberg Indeterminacy Equation
Will the Heisenberg Indeterminacy Equation be given to us for Test 3 or should we know it for the test?
- Tue Oct 31, 2017 11:08 am
- Forum: Sigma & Pi Bonds
- Topic: Pi Bonds
- Replies: 4
- Views: 1036
Re: Pi Bonds
I had a similar question, which elements have the greatest tendencies to form Pi bonds and why do elements form Pi bonds instead of other alternatives?
- Wed Oct 18, 2017 11:45 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Homework Problem 1.15
- Replies: 4
- Views: 585
Re: Homework Problem 1.15
Can we do this problem without using Rydberg's Formula? I'm trying to solve it with E= -hR/n^2, but I keep getting a decimal number... I'm not sure if I'm just doing the calculation wrong or if there is a problem with my method
- Tue Oct 17, 2017 1:28 am
- Forum: Photoelectric Effect
- Topic: Difference Between Work Function and the Energy Required to Remove an Electron from one Atom [ENDORSED]
- Replies: 4
- Views: 1053
Re: Difference Between Work Function and the Energy Required to Remove an Electron from one Atom [ENDORSED]
The only thing that you forgot was the stoichiometry, you need to convert the given data from kg/mol to J/atom ... Otherwise you are correct because the Work Function is defined as the Energy Required to Remove an Electron.
- Tue Oct 17, 2017 1:23 am
- Forum: Einstein Equation
- Topic: Use of symbols
- Replies: 6
- Views: 1170
Re: Use of symbols
If you are using slightly different symbols, you should make sure to define what each symbol is representing on the top of the blank space... As long as you do that, I don't see any reason for you to lose points. But also reach out to your TA, just in case
- Mon Oct 09, 2017 1:48 pm
- Forum: Properties of Light
- Topic: Electromagnetic Spectrum
- Replies: 1
- Views: 297
Electromagnetic Spectrum
Should we memorize the specific wavelengths that correspond to certain colors and types of waves in the electromagnetic spectrum or will these be given to us on tests? (ex. 700 nm=red or 100 nm = ultraviolet)