Search found 61 matches
- Sat Mar 16, 2019 6:33 pm
- Forum: General Rate Laws
- Topic: 6th edition 15.13
- Replies: 1
- Views: 456
6th edition 15.13
I am having trouble on this problem, how do you do it?
- Sat Mar 16, 2019 6:31 pm
- Forum: General Rate Laws
- Topic: Exergonic reaction
- Replies: 3
- Views: 573
Exergonic reaction
What does it mean for a reaction to be exergonic?
- Sat Mar 16, 2019 6:30 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Lyndon #13c
- Replies: 2
- Views: 1250
Lyndon #13c
Can someone explain 13c from Lyndon's review sheet?
- Sat Mar 16, 2019 6:28 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Lyndon #16
- Replies: 1
- Views: 234
Lyndon #16
Can someone explain #16 from Lyndon's worksheet? How did he get that graph?
- Sat Mar 16, 2019 6:26 pm
- Forum: Balancing Redox Reactions
- Topic: 6th edition 14.5
- Replies: 2
- Views: 4422
6th edition 14.5
I'm having trouble balancing the redox reaction.
- Sat Mar 16, 2019 6:22 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: E* +/-
- Replies: 1
- Views: 384
Re: E* +/-
Not necessarily, it can be negative depending on what half reactions are used.
- Mon Mar 04, 2019 11:23 am
- Forum: General Rate Laws
- Topic: 6th ed. 15.17
- Replies: 1
- Views: 229
6th ed. 15.17
How do you do number 17? I can't seem to figure it out
- Mon Mar 04, 2019 11:19 am
- Forum: Administrative Questions and Class Announcements
- Topic: Discussion about Test questions
- Replies: 5
- Views: 639
Re: Discussion about Test questions
Since everyone has taken the test it is fine if you discuss it
- Mon Mar 04, 2019 11:12 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: "N" in Kinetics
- Replies: 4
- Views: 486
Re: "N" in Kinetics
The N refers to the order of the reaction. So a first order reaction, where the N is 1, means that the rate of reaction is directly proportional to the concentration of reactants. r = k[A]^1
- Sat Feb 23, 2019 6:43 pm
- Forum: Balancing Redox Reactions
- Topic: Week 7 worksheet (2E, I, K)
- Replies: 4
- Views: 746
Re: Week 7 worksheet (2E, I, K)
Thank you so much Joyce!
- Sat Feb 23, 2019 6:41 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: What kind of fish has two sodium atoms?
A: 2Na.
A: 2Na.
- Sat Feb 23, 2019 6:38 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidating/Reducing AGENTS
- Replies: 6
- Views: 742
Re: Oxidating/Reducing AGENTS
The oxidating agent is the reactant that is reduced in a chemical reaction, and the reducing agent is the reactant that is oxidized in a reaction.
- Sat Feb 23, 2019 6:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic vs. Voltaic cells
- Replies: 1
- Views: 237
Re: Galvanic vs. Voltaic cells
They are the same thing, the name is interchangeable.
- Sat Feb 23, 2019 6:26 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Cell
- Replies: 1
- Views: 188
Re: Cell
You can tell by looking at which half reaction is reduced and which is oxidized. The anode is the one in which oxidation occurs and the cathode is the one in which reduction occurs.
- Sat Feb 23, 2019 6:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Midterm Question 1A Sig Figs?
- Replies: 1
- Views: 241
Re: Midterm Question 1A Sig Figs?
I wrote the Qp with two significant figures as well but didn't get any points off. I don't see why points would be taken off considering that the question does not explicitly ask you to find the Qp. However, it makes sense that if two of the known conditions are only known to one sig fig, then that ...
- Wed Feb 20, 2019 1:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Thermodynamics
- Replies: 1
- Views: 347
Re: Test 2 Thermodynamics
I would be prepared to work through and understand chemical processes under those conditions just in case. Thermodynamics usually involves at least one of those 3 conditions being held constant.
- Sat Feb 16, 2019 4:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
- Sat Feb 16, 2019 4:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
- Sat Feb 16, 2019 4:05 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous vs boiling point?
- Replies: 4
- Views: 835
Re: Spontaneous vs boiling point?
The boiling point is the minimum temperature at which this reaction could be spontaneous. Any temperature higher than the boiling point, the reaction would automatically favor the gas state and be spontaneous.
- Sun Feb 10, 2019 3:59 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: What do you call a clown in prison?
A: Silicon
A: Silicon
- Sun Feb 10, 2019 3:56 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Assumptions
- Replies: 2
- Views: 282
Re: Assumptions
These assumptions are usually made to simplify the concepts, and you should be told usually if you aren't working with a gas in ideal conditions. As for constant pressure, that sometimes is required (like in measuring enthalpy).
- Sun Feb 10, 2019 3:50 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneous processes
- Replies: 2
- Views: 222
Re: Spontaneous processes
Spontaneous processes are those which tend to occur without needing external influence, and the tendency of nature is to proceed towards greater disorder and more randomness. This is why entropy, the measure of this disorder, increases for spontaneous processes.
- Sat Feb 02, 2019 5:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: If H2O is the formula for water, what is the formula for ice?
A: (H2O)^3.
A: (H2O)^3.
- Sat Feb 02, 2019 5:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
I’d tell more chemistry jokes, but the best ones argon.
- Sat Feb 02, 2019 4:57 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: isolated system
- Replies: 5
- Views: 502
Re: isolated system
I personally don't think we would get many or any problems with isolated systems because as you said nothing would change, so there would be no calculations to do.
- Sun Jan 27, 2019 10:42 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Heisenberg is out for a drive when he’s stopped by a traffic cop. The cop says: ” Do you know how fast you were going? Heisenberg replies: “No, but I know where I am”.
- Sun Jan 27, 2019 10:42 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: Why does hamburger have lower energy than steak?
A: Because it’s in the ground state.
A: Because it’s in the ground state.
- Sun Jan 27, 2019 10:41 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: What do you call a tooth in a glass of water?
A: A one molar solution.
A: A one molar solution.
- Sun Jan 20, 2019 5:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Water in the Equilibrium Constant.
- Replies: 4
- Views: 400
Re: Water in the Equilibrium Constant.
Solids and liquids are present in such large quantities in comparison to the rest of the molecules that including them in the equilibrium constant equation is unnecessary because it wouldn't make a significant difference.
- Sun Jan 20, 2019 5:11 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strength and Weakness
- Replies: 12
- Views: 1073
Re: Strength and Weakness
The main way to compare is to look at their corresponding Ka values. Higher values mean that the forward reaction is more favored, which thereby means that the acid dissociates to a greater extent and is therefore stronger.
- Sun Jan 20, 2019 5:08 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: What did one charged atom say to the other?
A: I’ve got my ion you.
A: I’ve got my ion you.
- Sun Jan 13, 2019 9:02 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Old chemists don’t die, they just stop reacting.
- Sun Jan 13, 2019 8:59 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Le Chatelier's Principle
- Replies: 3
- Views: 394
Re: Le Chatelier's Principle
Looking at the difference in moles only works for reactions in which the products and reactants are gaseous. Such reactions typically prefer the direction in which the pressure is lowest, which in this case is when as few moles as possible are present.
- Sun Jan 13, 2019 8:55 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q
- Replies: 2
- Views: 209
Re: Q
The direction the reaction goes if it is endothermic or exothermic is mainly affected by the change in temperature of the reaction vessel. Since a change in temperature causes a change in K, I am not sure if Q can be used to determine the direction the reaction would go.
- Sat Dec 01, 2018 6:54 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Organic chemistry is difficult. Those who study it have alkynes of trouble.
- Sat Dec 01, 2018 6:52 pm
- Forum: Lewis Acids & Bases
- Topic: Difference between Lewis and Bronsted
- Replies: 5
- Views: 599
Re: Difference between Lewis and Bronsted
Bronsted acids and bases focus on the proton, so an Bronsted acid is a proton donor and a base is a proton acceptor. Lewis acids and bases focus on the electron, so an acid in this case is an electron acceptor and a base is an electron donor. I am not quite sure, however, whether we work with one mo...
- Sat Dec 01, 2018 6:49 pm
- Forum: Naming
- Topic: 6th Edition 17.29
- Replies: 2
- Views: 115
Re: 6th Edition 17.29
I think you are right. The only mention of 'cyano' in 17.5 is naming it isocyano if the N atom is linked to the metal atom, but I don't think we can be expected to know this. Also, the complex in 17.29 is already named in the book : "hexacyanidoferrate(II) ion" on pg 741. I think it is lik...
- Mon Nov 26, 2018 9:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Silver walks up to gold in a bar and says, "Au, get outta here!"
- Mon Nov 26, 2018 9:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
What did one charged atom say to the other? I've got my ion you.
- Mon Nov 26, 2018 9:28 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: What do you do with a dead chemist?
A: Barium
A: Barium
- Sun Nov 18, 2018 3:56 pm
- Forum: Sigma & Pi Bonds
- Topic: Calculating Amount of Sigma/Pi Bonds
- Replies: 4
- Views: 475
Re: Calculating Amount of Sigma/Pi Bonds
You can't really just know the amount of sigma and pi bonds by eyeballing the molecular formula, so in most cases you will need to draw out the lewis structure and look at the bonds there to determine it.
- Sun Nov 18, 2018 3:54 pm
- Forum: Hybridization
- Topic: sp3 hybridization
- Replies: 6
- Views: 495
Re: sp3 hybridization
The hybridization is based solely on the amount of "things" around the central atom, whether it's a lone pair or another atom, it will always be the same for a certain amount. So if there are 4 "things" around the central atom like in the tetrahedral or trigonal pyramidal case, t...
- Sun Nov 18, 2018 3:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: lone pairs
- Replies: 11
- Views: 868
Re: lone pairs
The specific decreases in angles caused by the presence of lone pairs can only be determined through experimentation, so you won't be expected to know the exact angle values.
- Sun Nov 11, 2018 8:02 pm
- Forum: Properties of Electrons
- Topic: Polar vs Non polar
- Replies: 15
- Views: 4696
Re: Polar vs Non polar
A quick rule of thumb to determine the polarity of a molecule is to look at how symmetrical it is. If the arrangement of the atoms is symmetrical, it will most likely be non polar.
- Sun Nov 11, 2018 8:00 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Florence Flask was getting ready for the opera. All of a sudden, she screamed: "Erlenmeyer, my joules! Somebody has stolen my joules!" The husband replied, "Calm down, honey. We'll find a solution."
- Sun Nov 11, 2018 7:59 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Equation
- Replies: 13
- Views: 3409
Re: Formal Charge Equation
The shortcut to find the formal charge is to take valence electrons - (# of lines + # of dots)
- Sun Nov 04, 2018 1:09 pm
- Forum: Empirical & Molecular Formulas
- Topic: garlic bread midterm practice #2
- Replies: 5
- Views: 602
Re: garlic bread midterm practice #2
When you divided all values by 3.15, you should have gotten about 1.14 for C. This is not close enough to 1 to round, so you should've multiplied all numbers by 7.
- Sun Nov 04, 2018 1:04 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Predicting polarizability and polarizing power
- Replies: 5
- Views: 830
Re: Predicting polarizability and polarizing power
Did he say that polarizability will be covered on the midterm?
- Sun Nov 04, 2018 1:03 pm
- Forum: Electronegativity
- Topic: Oxygen and Chlorine [ENDORSED]
- Replies: 2
- Views: 4670
Re: Oxygen and Chlorine [ENDORSED]
The electronegativity of an element is determined by the element's electron affinity and its ionization energy. The difference in the electronegativity between the two elements is quite small, but the main reason for it is because chlorine is one period below oxygen. Chlorine's valence electrons are...
- Sun Oct 28, 2018 9:21 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 15
- Views: 1520
Re: Midterm
So is the format going to be similar to the discussion tests we've been taking?
- Sun Oct 28, 2018 9:19 pm
- Forum: Student Social/Study Group
- Topic: Studying for tests/midterm
- Replies: 18
- Views: 2713
Re: Studying for tests/midterm
I am planning on going back through all the homework problems as well as going through the questions that the UA posted on chemistry community for us.
- Sun Oct 28, 2018 9:17 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Degeneracy
- Replies: 7
- Views: 494
Re: Degeneracy
The degeneracy of a 3p orbital, for example, would be 3 because that is the amount of orbitals inhabiting it.
- Sun Oct 21, 2018 8:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Do you have mole problems? If so, call Avogadro at 602-1023.
- Sun Oct 21, 2018 8:50 pm
- Forum: Properties of Electrons
- Topic: ml
- Replies: 5
- Views: 535
Re: ml
ml is the magnetic quantum number. It serves to distinguish the individual orbitals in a sub shell (l). ml can take the values from -l to l. So if l = 1, ml = -1, 0, or 1. l = 1 signifies the p-orbital, so these 3 numbers can also be written as px, py, and pz. This means that there are three orbital...
- Sun Oct 21, 2018 8:42 pm
- Forum: DeBroglie Equation
- Topic: Nodal Planes
- Replies: 4
- Views: 517
Re: Nodal Planes
The reason p- and d- orbitals have non-symmetric density in comparison to the s- orbital has to do with the angular momentum of the electrons. Electrons in the s-orbital have no angular momentum (l = 0), so they are simply distributed around the nucleus instead of circulating it. Electrons in greate...
- Sat Oct 13, 2018 8:52 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
What should you do if no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.
Keep telling them until you get a reaction.
- Sat Oct 13, 2018 8:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Writing in Pen
- Replies: 13
- Views: 1015
Re: Writing in Pen
I found some erasable pens on amazon so I'm just going to try using them on tests.
- Sat Oct 13, 2018 8:45 pm
- Forum: Properties of Light
- Topic: Homework Question 1A.3
- Replies: 4
- Views: 460
Re: Homework Question 1A.3
All electromagnetic waves travel at the speed of light 'c', hence the equation c = wavelength * frequency. Because frequency and wavelength are inversely proportional to each other, a decrease in frequency will affect the wavelength but not the speed - which is a constant.
- Thu Oct 04, 2018 11:40 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458336
Re: Post All Chemistry Jokes Here
Q: What kind of fish is made out of 2 sodium atoms?
A: 2 Na
A: 2 Na
- Thu Oct 04, 2018 11:33 pm
- Forum: Significant Figures
- Topic: Number of Sig Fig
- Replies: 8
- Views: 609
Re: Number of Sig Fig
So is it generally safe to not worry about sig figs in your calculations until you reach your final answer? When showing our work on tests do you think it'll be ok to use exact numbers until the end of the problem?
- Thu Oct 04, 2018 11:27 pm
- Forum: SI Units, Unit Conversions
- Topic: formula units [ENDORSED]
- Replies: 69
- Views: 32599
Re: formula units [ENDORSED]
I believe the unit you are thinking of is the Ãngström, 1Ã = 10^(-10).