Search found 61 matches

Sat Mar 16, 2019 6:33 pm
Forum: General Rate Laws
Topic: 6th edition 15.13
Replies: 1
Views: 280

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: 315

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: 136

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: 86

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: 535

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: 259

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: 112

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
Replies: 5
Views: 284

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: 191

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: 563

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: What kind of fish has two sodium atoms?
A: 2Na.
Sat Feb 23, 2019 6:38 pm
Forum: Balancing Redox Reactions
Topic: Oxidating/Reducing AGENTS
Replies: 6
Views: 210

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: 89

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: 89

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: 119

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: 162

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Sat Feb 16, 2019 4:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Sat Feb 16, 2019 4:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous vs boiling point?
Replies: 4
Views: 232

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: What do you call a clown in prison?
A: Silicon
Sun Feb 10, 2019 3:56 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Assumptions
Replies: 2
Views: 117

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: 73

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: If H2O is the formula for water, what is the formula for ice?
A: (H2O)^3.
Sat Feb 02, 2019 5:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8047
Views: 1412812

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: 200

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: 8047
Views: 1412812

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: Why does hamburger have lower energy than steak?
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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: What do you call a tooth in a glass of water?
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: 160

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: 498

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: What did one charged atom say to the other?
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: 8047
Views: 1412812

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: 145

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: 115

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: 8047
Views: 1412812

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: 271

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: 66

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: 8047
Views: 1412812

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: 8047
Views: 1412812

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: What do you do with a dead chemist?
A: Barium
Sun Nov 18, 2018 3:56 pm
Forum: Sigma & Pi Bonds
Topic: Calculating Amount of Sigma/Pi Bonds
Replies: 4
Views: 211

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: 208

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: 313

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: 1686

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: 8047
Views: 1412812

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: 2800

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: 286

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: 504

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: 501

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: 760

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: 1534

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: 253

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: 8047
Views: 1412812

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: 254

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: 287

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: 8047
Views: 1412812

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.
Sat Oct 13, 2018 8:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Writing in Pen
Replies: 13
Views: 571

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: 142

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: 8047
Views: 1412812

Re: Post All Chemistry Jokes Here

Q: What kind of fish is made out of 2 sodium atoms?
A: 2 Na
Thu Oct 04, 2018 11:33 pm
Forum: Significant Figures
Topic: Number of Sig Fig
Replies: 8
Views: 323

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: 24744

Re: formula units[ENDORSED]

I believe the unit you are thinking of is the Ãngström, 1Ã = 10^(-10).