Search found 53 matches
- Sat Mar 17, 2018 2:42 pm
- Forum: Zero Order Reactions
- Topic: Why are Mechanisms involving Enzyme/Catalysts Zero Order?
- Replies: 1
- Views: 576
Why are Mechanisms involving Enzyme/Catalysts Zero Order?
I have in my notes from lecture that enzymes and catalysts are zero order with regards to mechanisms. Why is this? Don't enzymes/catalysts make the rate faster by creating a pathway of lower activation energy and thereby, affect the rate of a reaction?
- Sat Mar 17, 2018 2:28 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What did the bartender say when oxygen, hydrogen, sulfur, sodium, and phosphorous walked into his bar?
A: OH SNaP!
A: OH SNaP!
- Sat Mar 17, 2018 12:54 pm
- Forum: *Amines
- Topic: Conditions for being an Amine Group
- Replies: 3
- Views: 1772
Conditions for being an Amine Group
I was wondering what exactly the conditions for being an amine group is. Aside from being a nitrogen with a lone pair in a carbon chain, are there any specific conditions like how a ketone must be a double bonded Oxygen bonded to two carbons?
- Sun Mar 11, 2018 7:07 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What do you call a wheel made of iron?
A: A ferrous wheel.
A: A ferrous wheel.
- Sun Mar 11, 2018 7:06 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What kind of fish is made out of 2 sodium atoms?
A: 2 Na
A: 2 Na
- Sat Mar 10, 2018 11:16 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Calculating potentials for reactions that have only reduction or only oxidation
- Replies: 1
- Views: 856
Calculating potentials for reactions that have only reduction or only oxidation
I was wondering how we would calculate the potential of a reaction that has only reduction or only oxidation? For example, the reaction
Cr2O7(2-) + 14H+ + 12e- --> 2Cr(s) + 7H2O is the sum of the two half reactions:
1. Cr2O7(2-) + 14H+ + 6e- ----> 2Cr(3+) + 7H2O
2. 2Cr(3+) + 6e- ---> 2Cr(s)
Cr2O7(2-) + 14H+ + 12e- --> 2Cr(s) + 7H2O is the sum of the two half reactions:
1. Cr2O7(2-) + 14H+ + 6e- ----> 2Cr(3+) + 7H2O
2. 2Cr(3+) + 6e- ---> 2Cr(s)
- Sun Mar 04, 2018 7:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Old chemists never die, they just stop reacting.
- Sun Mar 04, 2018 7:50 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: Why does hamburger yield lower energy than steak?
A: Because it's in the ground state.
A: Because it's in the ground state.
- Sun Mar 04, 2018 7:50 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Making bad chemistry jokes because all the good ones Argon
- Sun Feb 25, 2018 11:44 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What is the show cesium and iodine love watching together?
A: CSI
A: CSI
- Sun Feb 25, 2018 11:44 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Did you know that you can cool yourself to -273.15˚C and still be 0k?
- Sun Feb 25, 2018 10:32 am
- Forum: Balancing Redox Reactions
- Topic: Can the Hydroxide ion ever be reduced/oxidized?
- Replies: 3
- Views: 1105
Can the Hydroxide ion ever be reduced/oxidized?
Was wondering if hydroxide can ever participate in the exchange of electrons (oxidation/reduction) or if its only purpose is to keep charge balanced on both sides?
- Sun Feb 18, 2018 7:50 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Silver walks up to Gold in a bar and says, "AU, get outta here!"
- Sun Feb 18, 2018 7:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: Anyone know any jokes about sodium?
A: Na
A: Na
- Tue Feb 13, 2018 6:18 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Maximum Energy Able to Do Work [ENDORSED]
- Replies: 3
- Views: 568
Maximum Energy Able to Do Work [ENDORSED]
I remember in lecture that Dr. Lavelle mentioned that Gibb's Free Energy should really be called Gibb's available energy since when ∆G < 0, Gibb's free energy can be thought of as the maximum energy that a system can use to do work. I'm guessing that since Dr. Lavelle specified this definition under...
- Sun Feb 11, 2018 2:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO
He said NaBrO
- Sun Feb 11, 2018 2:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Don't trust atoms, they make up everything.
- Sun Feb 11, 2018 1:05 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What do you do if you can't helium or curium?
A: You BARIUM!
A: You BARIUM!
- Sun Feb 04, 2018 6:34 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
If the Silver Surfer and Iron Man team up, they’d be alloys.
- Sun Feb 04, 2018 6:34 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What is the chemical formula for "banana"?
A: BaNa2
A: BaNa2
- Sat Feb 03, 2018 7:28 pm
- Forum: Calculating Work of Expansion
- Topic: Confused about work formulas and specific heats
- Replies: 2
- Views: 462
Confused about work formulas and specific heats
Was going through some of the homework question and was confused by the various formulas for work and when you can use them. For example, when should I use w=-P∆V vs w=-nRTln((V2/V1))? Also, are we only supposed to use Cv and Cp for ∆S calculations when temperature is changing? Can we use these spec...
- Sun Jan 28, 2018 8:57 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Why do chemists like nitrates so much?
They're cheaper than day rates.
They're cheaper than day rates.
- Sat Jan 27, 2018 9:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
How about the chemical workers… are they unionized?
- Sat Jan 27, 2018 9:32 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Did you know that you can cool yourself to -273.15˚C and still be 0k?
- Sun Jan 21, 2018 10:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
What do you call an acid with an attitude?
A: A-mean-oh acid
A: A-mean-oh acid
- Sun Jan 21, 2018 2:22 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Is a bomb calorimeter an isolated system and is a coffee cup calorimeter a closed system?
- Replies: 2
- Views: 10671
Is a bomb calorimeter an isolated system and is a coffee cup calorimeter a closed system?
Was wondering if these two calorimeters are considered an isolated system and closed system respectively or is it the other way around?
- Sat Jan 20, 2018 6:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: When to use units of kJ/mol vs kJ?
- Replies: 1
- Views: 299
When to use units of kJ/mol vs kJ?
I'm a little confused on when to use units of kJ/mol in the answer. I know that if the question is asking for standard enthalpy of formation that you must provide the answer in kJ/mol, but when else would we use these units?
- Sun Jan 14, 2018 9:40 pm
- Forum: Phase Changes & Related Calculations
- Topic: Question about Problem 8.41
- Replies: 5
- Views: 621
Question about Problem 8.41
In the solutions manual, the answer uses the equation -q(water) = q(ice). Is this because the ice is lowering the temperature of the water?
- Sun Jan 14, 2018 9:30 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Differences between Bomb and Coffee Cup Calorimeters?
- Replies: 2
- Views: 3004
Differences between Bomb and Coffee Cup Calorimeters?
I was just wondering if there are any significant differences in the two calorimeters and whether or not calculations with them involve different equations.
Thanks
Thanks
- Sat Jan 13, 2018 5:43 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Question about Question 8.7
- Replies: 3
- Views: 536
Question about Question 8.7
For question 8.7, how does one differentiate work being done on a system vs. work being done by a system? Also, how does one calculate work once this distinction has been made?
- Sat Dec 09, 2017 9:57 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Chem Equilibrium Module 4 #15 [ENDORSED]
- Replies: 6
- Views: 1109
Re: Chem Equilibrium Module 4 #15 [ENDORSED]
In the textbook, 11.115 is a similar question which asks what will happen to the photosynthesis reaction when water is added. However in the solutions manual, it says that the reaction is unaffected since water is a pure liquid with unit concentration and the concentration of glucose will remain dil...
- Sat Dec 09, 2017 11:42 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity of CBr2Cl2
- Replies: 2
- Views: 8229
Polarity of CBr2Cl2
When drawing out the lewis structure of CBr2Cl2, I drew as tetrahedral and completed an octet for the chlorine and bromine atoms. However this molecule is polar since that the dipoles don't cancel. Why is this? Why won't the dipoles cancel?
- Fri Dec 08, 2017 11:07 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: EDTA and Thiocyanto Ligands [ENDORSED]
- Replies: 1
- Views: 413
EDTA and Thiocyanto Ligands [ENDORSED]
For writing out the formulas of compounds, would we be required to write out the entire chemical formula for EDTA or is (edta) and its associated prefix enough to provide? Also, I read that Thiocyanato is an ambidentate ligand, as it can attach at either the sulfur or nitrogen atom. Does this mean t...
- Thu Dec 07, 2017 5:55 pm
- Forum: Hybridization
- Topic: Hybridization/Hybrid Orbitals of Pi Bonds
- Replies: 2
- Views: 443
Hybridization/Hybrid Orbitals of Pi Bonds
Doest the hybridization of a pi bond also ultilize an un-used p orbital? For example, would the pi bond in CN- have a composition of
π(C 2p, N 2p)?
π(C 2p, N 2p)?
- Mon Dec 04, 2017 6:38 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Determining Number of Water Molecules Liganded to a Transition Metal Ion
- Replies: 1
- Views: 403
Determining Number of Water Molecules Liganded to a Transition Metal Ion
When writing the hydrolysis equation for homework question 12.65 f, how could we determine that there are 6 water molecules liganded to the central Copper (II) ion? Is this just something we have to memorize for the common TM ions or is there an intuitive way to determine it?
- Sun Dec 03, 2017 7:36 pm
- Forum: Polyprotic Acids & Bases
- Topic: Polyprotic pH approximation
- Replies: 1
- Views: 669
Polyprotic pH approximation
For 12.81, the question states to calculate the pH of a diprotic acid solution of H2CO3, ignoring the second deprotonation. In what scenario would we not be allowed to use this approximation and calculate the total [H3O+] for the more accurate pH after both deprotonations?
- Sat Dec 02, 2017 5:27 pm
- Forum: Amphoteric Compounds
- Topic: pH of an Amphiprotic Species [ENDORSED]
- Replies: 1
- Views: 855
pH of an Amphiprotic Species [ENDORSED]
How would you calculate the pH of a amphiprotic species, as it has the ability to both accept and donate hydrogen protons? For example, how could you calculate the pH of 0.010 M NaHCO3. I understand that the sodium ion would be a spectator and thus, the HCO3 ion would contribute to the pH of the sys...
- Sun Nov 26, 2017 10:46 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc or Kp for a heterogenenous equilibrium?
- Replies: 2
- Views: 370
Kc or Kp for a heterogenenous equilibrium?
Take an equilibria such as BF3(g) + 3H2O(l) ⇌ 3HF (aq) + H3BO3 (aq) In this example, in order to calculate the equilibrium constant, we need the same units for all compounds (ie: molarity/atmospheres). But in this example, would we specifically be calculating Kc or Kp? Or would it not matter provide...
- Sat Nov 25, 2017 11:26 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chateliers Principle
- Replies: 3
- Views: 626
Re: Le Chateliers Principle
LCP, aka Le Chatelier's principle, is basically the idea that if a stress is applied to a system in equilibrium, the system will try to reverse said stress. For example, take the reaction SO2(g)+O2(g)⇌SO3(g), if the concentration of SO2 was increased, the system would try to remove the added SO2 by ...
- Sat Nov 25, 2017 11:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Symmetry of VSEPR Structures with Lone Pairs
- Replies: 1
- Views: 759
Symmetry of VSEPR Structures with Lone Pairs
While I was doing homework problems, I noticed that XeF4 had the molecular geometry of square planar but was considered non-polar since its lone pairs are opposite of one another and thus, cancel each other out, resulting in a overall non-polar molecule. Are there any other examples of VSEPR structu...
- Mon Nov 20, 2017 3:00 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 2
- Views: 336
Coordination Number
Is the coordination number basically the number of ligands attached to a central TM atom? Does a ligand being polydentate factor into the coordination number of the complex?
- Mon Nov 20, 2017 2:58 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating Complexes
- Replies: 5
- Views: 657
Re: Chelating Complexes
So basically a chelating complex is one that forms a ring around a central transition metal. Therefore, the positions of the ligands matter as the coordination covalent bond formed must be in a ring orientation.
- Mon Nov 20, 2017 2:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
I don't trust atoms....they make up everything
- Sun Nov 05, 2017 1:16 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What do you do if you can't helium?
A: You BARIUM!
A: You BARIUM!
- Sat Nov 04, 2017 9:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
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
- Sat Oct 28, 2017 9:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
Q: What do you do with a dead chemist?
A: You BARIUM!
A: You BARIUM!
- Wed Oct 25, 2017 8:17 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Homework Question 2.17 part d
- Replies: 5
- Views: 696
Homework Question 2.17 part d
Hi there,
I was doing the homework question 2.17 which asks,
How many orbitals are in the subshells with l = to 3
I know that when l = 3, n=4 but wouldn't n=4 have 8 orbitals as there are the 1s,2s,2p,3s,3p,3d,4s,4p orbitals? The solutions manual says there are 7.
Thanks
I was doing the homework question 2.17 which asks,
How many orbitals are in the subshells with l = to 3
I know that when l = 3, n=4 but wouldn't n=4 have 8 orbitals as there are the 1s,2s,2p,3s,3p,3d,4s,4p orbitals? The solutions manual says there are 7.
Thanks
- Sun Oct 22, 2017 7:43 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: nodal planes [ENDORSED]
- Replies: 3
- Views: 785
Re: nodal planes [ENDORSED]
Adding on to the previous point, orbitals are basically probability distributions since we know that it is impossible to find out an electron's exact position at any given time. A nodal plane is simply put, an area in which there aren't any electrons. In other words, it is where the graph of the orb...
- Sun Oct 22, 2017 7:40 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
A: Laboratory Retrievers
A: Laboratory Retrievers
- Sat Oct 14, 2017 1:47 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Question about Balmer Series [ENDORSED]
- Replies: 2
- Views: 1800
Question about Balmer Series [ENDORSED]
So as I understand, the Balmer series is a particular Hydrogen spectral series when an electron moves from a higher energy level to n=2. My question then is after reaching the energy level of n=2, would the electron then travel down to n=1 as that is ground state and thus, emit another form of EM ra...
- Sat Oct 14, 2017 1:44 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
I don't trust atoms...
I hear they make up everything
I hear they make up everything
- Thu Oct 05, 2017 9:41 pm
- Forum: Empirical & Molecular Formulas
- Topic: Chemical Principles F.24 HELP!
- Replies: 2
- Views: 4589
Chemical Principles F.24 HELP!
Dolomite is a mixed carbonate of calcium and magnesium. Calcium and Magnesium carbonates both decompose upon heating to produce the metal oxides (MgO and CaO) and Carbon dioxide. If 4.84g of residue consisting of MgO and CaO remains when 9.66g of dolomite is heated until decomposition is complete, w...
- Wed Oct 04, 2017 7:17 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3917588
Re: Post All Chemistry Jokes Here
What do you do if you can't helium or curium?
You BARIUM!
You BARIUM!