Search found 60 matches
- Sat Mar 16, 2019 8:35 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature and Le Chatlier's Principle
- Replies: 6
- Views: 867
- Sat Mar 16, 2019 9:14 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature and Le Chatlier's Principle
- Replies: 6
- Views: 867
Temperature and Le Chatlier's Principle
I forget how Temperature affects the reaction, can someone explain it please?
- Sat Mar 16, 2019 9:12 am
- Forum: General Rate Laws
- Topic: Rate Law
- Replies: 1
- Views: 280
Re: Rate Law
For every reaction, there should be a rate of formation and a rate of consumption.
- Sat Mar 16, 2019 9:09 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
I wish I had more chemistry jokes, but I can only think of them periodically.
- Sat Mar 16, 2019 9:08 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What would you call a clown in jail?
Silicon
Silicon
- Sat Mar 16, 2019 9:05 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Collisions/Temperature dependence
- Replies: 2
- Views: 293
Re: Collisions/Temperature dependence
I think it's talking about how if there are more collisions, that means the temperature is rising.
- Sat Mar 16, 2019 9:02 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy
- Replies: 2
- Views: 281
Re: Activation Energy
You can tell if you are given both of the activation energies. If the forward rxn Ae is greater than the reverse rxn Ae, then it is endothermic, because the reverse reaction takes less energy to occur. If the reverse rxn Ae is greater than the forward rxn Ae, then it is exothermic, because the forwa...
- Sat Mar 16, 2019 8:58 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What happened to the man with sodium chloride and a 9-V in his car?
He was booked for a-salt and battery.
He was booked for a-salt and battery.
- Sat Mar 16, 2019 8:56 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What is the most important rule in chemistry?
Never lick the spoon!
Never lick the spoon!
- Sat Mar 16, 2019 8:56 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What did the chemist say when he found 2 isotopes of helium?
HeHe
HeHe
- Sat Mar 16, 2019 8:54 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What did one charged atom say to anther?
I've got my ion you.
I've got my ion you.
- Sat Mar 16, 2019 8:54 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What do you call one tooth in a glass of water?
A one molar solution.
A one molar solution.
- Sat Mar 16, 2019 8:51 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
Why does the army use acid?
To neutralize their enemy base.
To neutralize their enemy base.
- Sat Mar 16, 2019 8:50 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
I studied exothermic reactions before they were cool.
- Sat Mar 16, 2019 8:49 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
Don't trust atoms, they make up everything.
- Sat Mar 16, 2019 8:48 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
Every dipole has their moment.
- Sat Mar 16, 2019 8:47 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What do you do with a sick chemist?
If you can't helium and you can't curium, you might as well barium.
If you can't helium and you can't curium, you might as well barium.
- Sat Mar 16, 2019 8:46 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
I wanted to write a joke about the periodic table, but I didn't feel like I was in my element.
- Sat Mar 16, 2019 8:46 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
Did you know you can lower your body temperature to -273 Degrees Celsius and still be 0K?
- Sat Mar 16, 2019 8:42 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
Laboratory retrievers!
Laboratory retrievers!
- Sat Mar 16, 2019 8:38 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst
- Replies: 14
- Views: 1229
Re: Nernst
Yes, if you have a balanced reduction half rxn and balanced oxidation half rxn, they will both tell you the number of e- transferred.
- Sat Mar 16, 2019 8:36 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q VS. K
- Replies: 13
- Views: 1642
Re: Q VS. K
Yes! Q is just when the reaction is not at equilibrium, but is calculated the same way.
- Thu Mar 14, 2019 12:47 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
Why did the bear dissolve in water?
Because it was a POLAR bear!!!
Because it was a POLAR bear!!!
- Thu Mar 14, 2019 12:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3616639
Re: Post All Chemistry Jokes Here
Why do chemistry do well when working with ammonia?
Because it's pretty basic stuff.
Because it's pretty basic stuff.
- Tue Feb 26, 2019 8:45 pm
- Forum: Balancing Redox Reactions
- Topic: Problem 6k3 part d seventh edition
- Replies: 1
- Views: 275
Problem 6k3 part d seventh edition
I don't understand how to form a reduction and oxidation reaction from the equation Cl2-->HClO + Cl2
Thank you in advance!!
Thank you in advance!!
- Wed Feb 13, 2019 11:27 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Useful Summary of Thermodynamic Definitions
- Replies: 55
- Views: 18589
Re: Useful Summary of Thermodynamic Definitions
I am having trouble distinguishing the difference between a state function and an intensive property, they seem very similar to me.
- Fri Jan 18, 2019 7:49 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Negative pH
- Replies: 12
- Views: 1575
Re: Negative pH
Unless the question pertains to identifying what substance it is, we probably won't be asked to identify a superacid/base.
- Fri Jan 18, 2019 6:27 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Example in class
- Replies: 5
- Views: 586
Re: Example in class
I'm not in lecture 2 so I may not be correct, but if he used Q then it was probably because the rxn was not at equilibrium.
- Fri Jan 18, 2019 6:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Question 6D.13 7th edition
- Replies: 1
- Views: 355
Re: Question 6D.13 7th edition
So first of all, ranking increasing pH means the most H+ ions first, because on the pH scale the more acidic (the more H+ ions) the lower the number. Second, you can do this by finding out the acidity of the solution. For strong acids you can assume complete dissociation, meaning H+ concentration wi...
- Fri Jan 18, 2019 6:19 pm
- Forum: Ideal Gases
- Topic: Percentage protonated
- Replies: 2
- Views: 523
Re: Percentage protonated
Further, Lavelle mentioned for weak acid/base it should be below 5% protonated as a way to check if you did the problem right.
- Fri Dec 07, 2018 12:35 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pKa versus pKb versus Ka versus Kb [ENDORSED]
- Replies: 2
- Views: 342
Re: pKa versus pKb versus Ka versus Kb [ENDORSED]
Ka-- acidity
Kb--bacisity
In an such as equation AH + H2O => H3O+ + A-, Ka=products/reactants, and measures the extent to which an acid dissociates in solution (same for Kb but with a basic equation).
p means -log( ).
Kb--bacisity
In an such as equation AH + H2O => H3O+ + A-, Ka=products/reactants, and measures the extent to which an acid dissociates in solution (same for Kb but with a basic equation).
p means -log( ).
- Fri Dec 07, 2018 12:29 am
- Forum: Polyprotic Acids & Bases
- Topic: Identifying polyprotic acids and bases
- Replies: 2
- Views: 496
Re: Identifying polyprotic acids and bases
In the compounds listed above, a commonality is multiple H atoms in compounds such as H2CO3
- Fri Dec 07, 2018 12:26 am
- Forum: Lewis Acids & Bases
- Topic: Lewis and Bronsted
- Replies: 8
- Views: 832
Re: Lewis and Bronsted
Lewis has to do with electrons and bronzed has to do with protons.
- Fri Dec 07, 2018 12:23 am
- Forum: Amphoteric Compounds
- Topic: H2O as Amphotertic Compound
- Replies: 1
- Views: 192
H2O as Amphotertic Compound
Is H2O the only amphoteric compound we'll be using? Can anyone find another example of an amphoteric compound
- Fri Dec 07, 2018 12:21 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to tell if something is a chelate
- Replies: 6
- Views: 615
Re: How to tell if something is a chelate
I believe if the ligand forms a ring with the TM, it is a chelate
- Thu Dec 06, 2018 11:47 pm
- Forum: Biological Examples
- Topic: Ligands
- Replies: 7
- Views: 887
Re: Ligands
Regarding ligands, the transition metal/cation will almost always be the central atom.
- Thu Dec 06, 2018 11:43 pm
- Forum: Naming
- Topic: Final Exam
- Replies: 9
- Views: 901
Re: Final Exam
It is probably a good idea to memorize it, on Lyndon's churro practice questions there are questions with en and ox.
- Thu Nov 29, 2018 11:30 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Drawing a Dipole
- Replies: 6
- Views: 658
Re: Drawing a Dipole
Yes, the arrow should be pointing towards the more electronegative atom.
- Thu Nov 29, 2018 11:25 am
- Forum: Hybridization
- Topic: Difference between hybridization and hybrid orbitals
- Replies: 4
- Views: 749
Re: Difference between hybridization and hybrid orbitals
I believe they are the same thing as well.
- Thu Nov 29, 2018 11:23 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs Non-Polar
- Replies: 2
- Views: 292
Re: Polar vs Non-Polar
Looking at the overall dipole is a good way to determine polarity.
- Thu Nov 29, 2018 11:21 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angular Shape
- Replies: 3
- Views: 370
Re: Angular Shape
Less than 120 degrees, lone pairs alter the bond angle slightly.
- Thu Nov 29, 2018 11:08 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 7th edition 2E.1 mistake ?
- Replies: 6
- Views: 767
Re: 7th edition 2E.1 mistake ?
I don't believe it's a mistake--if you have a electron geometry of trigonal bipyramidal, but 3 lone pairs, the molecular geometry will be linear.
- Thu Nov 29, 2018 11:00 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.29 (7th edition)
- Replies: 2
- Views: 321
Re: 2E.29 (7th edition)
1 has the largest dipole. The dipoles cancel in 3, and since the Cl's are further apart in 2, 1 has the largest dipole. Hope this helped!
- Thu Nov 29, 2018 10:46 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E17th edition
- Replies: 1
- Views: 199
Re: 2E17th edition
Since the the shape is bent, there must be a lone pair, although you are right, it should be less than 120 degrees.
- Thu Nov 29, 2018 10:43 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs Nonpolar for CH2Cl2
- Replies: 2
- Views: 337
Re: Polar vs Nonpolar for CH2Cl2
Since the structure is tetrahedral, the overall dipoles do not cancel.
- Fri Nov 16, 2018 1:58 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Polar v. Non Polar
- Replies: 7
- Views: 877
Re: Polar v. Non Polar
Another way to think of it is molecules like BF3 and CH4 are non polar because they are all being pulled equally in each directly (dipoles cancel) but in molecules such as H20, there is an overall dipole so it is polar.
- Fri Nov 16, 2018 1:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs in Molecular Shape
- Replies: 4
- Views: 514
Re: Lone Pairs in Molecular Shape
Lone pairs are areas of electron density, so they do take up space (like an atom does), but they depress the bond angles more than a normal atom; I think of it as lone pairs needing elbow room!
- Fri Nov 16, 2018 1:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Distance from Central Atom
- Replies: 8
- Views: 589
Re: Distance from Central Atom
I always think of it as shaded represents an atom coming out of the page and dashed represents an atom going backwards, into the page.
- Fri Nov 16, 2018 1:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: dash and wedge diagram
- Replies: 3
- Views: 234
Re: dash and wedge diagram
Lavelle mentioned in lecture that we don't need to draw them using the dash wedge diagram, just the lewis structures. You just have to be able to recognize the shape based off of how many lone pairs/bonding pairs.
- Fri Nov 16, 2018 1:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 516
Re: Bond Angles
I believe that we just have to recognize that when there are lone pairs, the bond angles are depressed. i.e. 3 bonding pairs 1 lone pair, as long as you say bond angles are less than 109.5 degrees because of the lone pier you should be fine.
- Thu Oct 25, 2018 9:29 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Nodal Planes and test 2
- Replies: 3
- Views: 309
Nodal Planes and test 2
Is it necessary to know how many nodal planes for each orbital for test 2?
- Thu Oct 25, 2018 9:19 pm
- Forum: Trends in The Periodic Table
- Topic: Isoelectronic Atoms
- Replies: 4
- Views: 380
Re: Isoelectronic Atoms
They are not the same size because there is a different attraction to the nucleus. For example, a cation (one less electron) is smaller because there are less electrons for the positive nucleus to pull on, pulling in the electrons tighter and making the atomic radius smaller.
- Thu Oct 25, 2018 9:15 pm
- Forum: Properties of Light
- Topic: Degenerate orbitals
- Replies: 2
- Views: 429
Degenerate orbitals
In the book the only degenerate orbitals are one-electron atoms only, but the internet explains it as something different. Is the book's description accurate??
- Thu Oct 18, 2018 10:37 am
- Forum: Properties of Light
- Topic: Problem 1.3, Seventh edition
- Replies: 1
- Views: 187
Problem 1.3, Seventh edition
So in 1.3, ultimately you are supposed to convert your Joules into Js^-1=watts. I have the joules produced (753.669), but from here do I multiply by hertz to get Js^-1? Thank you!
- Thu Oct 11, 2018 6:02 pm
- Forum: Einstein Equation
- Topic: Question on Midterm
- Replies: 7
- Views: 973
Re: Question on Midterm
Since we will be given a sheet with all the equations and constants on it, we'll just use the constant to as many sig figs as given :)
- Thu Oct 11, 2018 5:55 pm
- Forum: Properties of Light
- Topic: Do I need to memorize the Light Spectrum? [ENDORSED]
- Replies: 13
- Views: 974
Re: Do I need to memorize the Light Spectrum? [ENDORSED]
There was a problem on the homework (1A.5) that asked to list waves in order of of decreasing wavelength, so maybe if we know the range of each type of wave generally.
- Thu Oct 11, 2018 5:47 pm
- Forum: Properties of Light
- Topic: Unit conversion in 1B.5
- Replies: 1
- Views: 107
Unit conversion in 1B.5
In problem 1B.5, the energy is in eV, and I couldn't find in the book the conversion factor from eV to joules. Thanks in advance!
- Wed Oct 03, 2018 11:23 pm
- Forum: Balancing Chemical Reactions
- Topic: Order of balancing an equation
- Replies: 8
- Views: 673
Re: Order of balancing an equation
As a general rule of thumb, I tend to balance the "odd" or weird elements first (basically anything that's not C, H or O) and then go C, H and oxygen last.
- Wed Oct 03, 2018 11:16 pm
- Forum: SI Units, Unit Conversions
- Topic: Question E3 in the textbook
- Replies: 2
- Views: 270
Re: Question E3 in the textbook
Since the molar mass of gallium is 1/3 the amount of the molar mass of astatine, you need 1/3 gallium atoms for the masses to be equal (1/3 of 210 = 70).
- Wed Oct 03, 2018 11:05 pm
- Forum: Balancing Chemical Reactions
- Topic: Extensive v. Intensive Property [ENDORSED]
- Replies: 6
- Views: 2551
Re: Extensive v. Intensive Property [ENDORSED]
An extensive property is a property that changes depending on the amount, such as volume. An intensive property will stay the same no matter how much or little you have of it, such as density. Say you have a cup of water; if you add more water to it, the volume will change but the density will stay ...