What is the chemical formula for ice?
H2O cubed
Search found 100 matches
- Wed Mar 10, 2021 11:52 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
- Wed Mar 10, 2021 11:51 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why did Mr. Watt work in the jewelry store?
He could sort through 1 Joule per second
He could sort through 1 Joule per second
- Wed Mar 10, 2021 11:51 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Anyone know any sodium jokes?
Na
Na
- Wed Mar 10, 2021 11:49 am
- Forum: *Enzyme Kinetics
- Topic: catalyst vs intermediate
- Replies: 13
- Views: 897
Re: catalyst vs intermediate
This is how I understand it: Catalysts are needed to drive a reaction. You'll typically see them in the reactants of the first step. Intermediates are produced over the course of the reaction. If you are given two steps, they will typically be in the products of the first step and the reactants of t...
- Mon Mar 08, 2021 11:15 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Ea
- Replies: 2
- Views: 198
Ea
What is the difference between Ea and the E we learned about previously?
- Fri Mar 05, 2021 11:46 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why are atoms untrustworthy?
They make up everything
They make up everything
- Fri Mar 05, 2021 11:46 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What's the sign of a bad chem joke?
No reaction
No reaction
- Fri Mar 05, 2021 11:45 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What did the scientist say when he found two Helium isotopes
HeHe
HeHe
- Fri Mar 05, 2021 11:44 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Order Curiosity
- Replies: 1
- Views: 146
Order Curiosity
What is the highest order a reaction has ever been recorded?
- Fri Mar 05, 2021 11:35 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Determining the Slowest Step
- Replies: 4
- Views: 237
Determining the Slowest Step
How do we determine which elementary step is the slowest in a reaction? Or will that always be given to us by experimental results?
- Fri Feb 26, 2021 11:40 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Silver walks up to gold in a bar and says
"Au! Get out of here!"
"Au! Get out of here!"
- Fri Feb 26, 2021 11:39 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What is Cesium and Iodine's favorite show?
CsI
CsI
- Fri Feb 26, 2021 11:38 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What did one charged atom say to the other?
I've got my ion you
I've got my ion you
- Wed Feb 24, 2021 11:15 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration Cell Pt 2
- Replies: 1
- Views: 125
Concentration Cell Pt 2
Do concentration cells work similarly to a concentration gradient in the membrane of a biological cell?
- Wed Feb 24, 2021 11:14 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration Cells
- Replies: 3
- Views: 181
Concentration Cells
If E under standard conditions always = 0V, does that mean concentration cells only produce electrical energy under non standard conditions? Or is E(not) accounting for after the solutions reach equal concentration?
- Fri Feb 19, 2021 10:28 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Did you hear about oxygen's date with potassium?
It went OK
It went OK
- Fri Feb 19, 2021 10:27 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Did you hear the one about cobalt, radon, and yttrium?
It was CoRnY
It was CoRnY
- Fri Feb 19, 2021 10:27 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
I tried writing a chemistry joke but it was out of my element
- Wed Feb 17, 2021 1:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: anode and cathode L/R
- Replies: 14
- Views: 614
Re: anode and cathode L/R
I don't think it matters which side they are on, but it's just important to know that electrons always flow from anode to cathode. Because if you were looking at a 3D version of Lavelle's example straight on, the anode would be on the left and cathode on the right, but if you walked around to the ot...
- Wed Feb 17, 2021 1:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Low Battery
- Replies: 3
- Views: 267
Low Battery
When a battery "runs out of juice" does that mean that either the cathode or anode has dissolved so much that it will not carry out the reaction anymore?
- Fri Feb 12, 2021 12:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What kind of fish is made out of two sodium atoms?
2Na
2Na
- Fri Feb 12, 2021 12:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
Laboratory retrievers
Laboratory retrievers
- Fri Feb 12, 2021 11:59 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why did Mr. Watt work in the jewelry store?
He could sort through one Jewel per second!
He could sort through one Jewel per second!
- Fri Feb 12, 2021 11:21 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Low temp making DeltaG negative?
- Replies: 8
- Views: 369
Low temp making DeltaG negative?
I was just wondering if there could be a case where DeltaH is positive and DeltaS is negative and it would still be spontaneous because you have a very low temperature?
- Wed Feb 10, 2021 11:09 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Delta S Universe
- Replies: 2
- Views: 186
Delta S Universe
If Delta S of the system and Delta S of surroundings are equal and opposite, Would that mean delta S universe always equals 0?
- Fri Feb 05, 2021 8:53 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What is the name of 007's eskimo cousin?
Polar Bond
Polar Bond
- Fri Feb 05, 2021 8:52 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why does a hamburger yield lower energy than a steak
Because it's in its ground state
Because it's in its ground state
- Fri Feb 05, 2021 8:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why do chemists enjoy working with ammonia?
It's pretty basic stuff
It's pretty basic stuff
- Fri Feb 05, 2021 8:41 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy increase or decrease?
- Replies: 3
- Views: 209
Entropy increase or decrease?
What are the characteristics of a system in which entropy increases and what are the characteristics of a system in which entropy decreases?
- Mon Feb 01, 2021 11:26 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: External Pressure
- Replies: 32
- Views: 962
External Pressure
What exactly constitutes external pressure? Is it the pressure pushing down on the piston, the pressure inside the beaker, or the difference between the two, or something else?
- Wed Jan 27, 2021 12:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why did the white bear dissolve in water?
Because it was polar
Because it was polar
- Wed Jan 27, 2021 12:09 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What's the dullest element?
Bohrium
Bohrium
- Wed Jan 27, 2021 12:07 pm
- Forum: Calculating Work of Expansion
- Topic: Equilibrium systems
- Replies: 2
- Views: 169
Re: Equilibrium systems
I'm confused too, but my understanding was that since P (internal) is approximately equal to P(external), there is very little fluctuation between the two
- Wed Jan 27, 2021 12:02 pm
- Forum: Calculating Work of Expansion
- Topic: Systems at Equilibrium
- Replies: 3
- Views: 158
Re: Systems at Equilibrium
I'm kinda confused about most of these things too. But I believe that a system at equilibrium is reversible because the external and internal forces on opposing sides would be equal to each other whereas a system not at equilibrium would be irreversible because one force is greater than another. For...
- Mon Jan 25, 2021 11:30 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Exothermic vs. Endothermic Clarification
- Replies: 3
- Views: 90
Exothermic vs. Endothermic Clarification
Hi so I understand that an exothermic reaction releases heat and an endothermic reaction absorbs heat, but for cases like "ice melting is an endothermic reaction" I get a little confused. In order for a reaction to be exothermic, does the whole system have to increase in heat? Because I wo...
- Fri Jan 22, 2021 9:37 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What did the chemist say after the explosion in the lab?
Oxidants happen
Oxidants happen
- Fri Jan 22, 2021 9:36 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why was Avogadro a mini golf champ?
He always got a mole in one
He always got a mole in one
- Fri Jan 22, 2021 9:35 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why do chemists enjoy working with ammonia?
It's pretty basic
It's pretty basic
- Fri Jan 22, 2021 9:00 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Electronegativity and Bond Enthalpy?
- Replies: 2
- Views: 144
Electronegativity and Bond Enthalpy?
If a molecule has three atoms (let's say carbon is the central atom) and it is bonded to a very electronegative atom and a relatively non electronegative atom. Would the pull of the electronegative atom affect the bond enthalpy between the carbon and the non electronegative atom?
- Thu Jan 21, 2021 11:05 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Kc?
- Replies: 5
- Views: 168
K vs. Kc?
In table 5G.2 in the textbook, it gives the K and Kc of certain reactions at different temperatures. I am confused about why the K values and Kc values differ. What is the difference between the two?
- Fri Jan 15, 2021 7:14 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What do you call a clown in jail?
A silicon
A silicon
- Fri Jan 15, 2021 7:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What do chemists call a benzene ring with iron atoms instead of carbon atoms?
A ferrous wheel
A ferrous wheel
- Fri Jan 15, 2021 7:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
If Iron man and the Silver Surfer teamed up, they'd be alloys
- Wed Jan 13, 2021 11:46 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH and pOH vs. pKa and pKb
- Replies: 9
- Views: 516
pH and pOH vs. pKa and pKb
How are pH and pOH and pKa and pKb related? Does pH = pKa and pOH = pkB?
- Mon Jan 11, 2021 11:13 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Large Kc for Cubic Equations
- Replies: 6
- Views: 384
Large Kc for Cubic Equations
Is it possible to have a large Kc in chemical formula that results in cubic equations? Or are we just staying away from that in an effort to keep complexity out of it?
- Sat Jan 09, 2021 10:31 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
What do you call a tooth in a glass of water?
A one molar solution
A one molar solution
- Sat Jan 09, 2021 10:30 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
I was going to tell a chemistry joke but I was afraid I would get no reaction
- Sat Jan 09, 2021 10:01 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Inert Gas Pressure Change
- Replies: 3
- Views: 102
Inert Gas Pressure Change
Why is it that when you add an inert gas to a reaction, the volume does not decrease?
- Sat Jan 09, 2021 9:45 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Le Chatelier's Principle
- Replies: 4
- Views: 176
Le Chatelier's Principle
In lecture, Le Chatelier's principle was applied to N2 + 3H2 <--> 2NH3. Dr. Lavelle said if we increase N2, H2 decreases and 2NH3 increases. My question is, would it ever get to the point where the amount of NH3 would no longer increase because H2 would end up being a limiting reactant because you a...
- Mon Jan 04, 2021 12:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: If K is large...
- Replies: 11
- Views: 1031
If K is large...
In lecture, Dr. Lavelle says that if K is greater, concentration of product is greater at equilibrium. I would think that the concentrations of reactants and products would be close to equal if they were in equilibrium. I know now I am wrong to assume this, but does someone have an example of a chem...
- Fri Dec 11, 2020 12:05 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
If H2O is the formula for water, what is the formula for ice?
H2O cubed
H2O cubed
- Fri Dec 11, 2020 11:52 am
- Forum: Student Social/Study Group
- Topic: Final Review Lecture Question
- Replies: 1
- Views: 153
Final Review Lecture Question
On question 7 (Redrawing Methyl-2-Cyanocrylate) Dr. Lavelle adds 3 Hydrogen atoms to the Carbon atom on the far right of the molecule. How did he know to do that? Or is that the common procedure in making sure Carbon has four bonds?
- Thu Dec 10, 2020 2:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why did the man get lead poisoning after eating lunch?
He had a Pb&J
He had a Pb&J
- Wed Dec 09, 2020 11:35 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Titration Diagram
- Replies: 5
- Views: 237
Titration Diagram
What do the points labeled A,B,C,D,E in the titration diagram from lecture stand for? Are they as important as the stoichiometric point?
- Wed Dec 09, 2020 10:38 am
- Forum: Calculating the pH of Salt Solutions
- Topic: Titration Diagram
- Replies: 4
- Views: 338
Titration Diagram
In the Titration diagram, what do the points labeled A,B,C,D, and E stand for? Are they as important as the stoichiometric point?
- Fri Dec 04, 2020 6:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
I tried to come up with a joke about the periodic table but I was way out of my element
- Fri Dec 04, 2020 6:22 pm
- Forum: Conjugate Acids & Bases
- Topic: Discussion Problem
- Replies: 2
- Views: 149
Re: Discussion Problem
Using the picture the last person included, it basically means whatever is left over from the acid losing an H+ will be a conjugate base and vice versa for Conjugate acids
- Fri Dec 04, 2020 6:00 pm
- Forum: Conjugate Acids & Bases
- Topic: Definition of "Conjugate"
- Replies: 5
- Views: 233
Definition of "Conjugate"
What does the word "conjugate" mean when regarding acids and bases and what causes an acid and base to be conjugate?
- Fri Dec 04, 2020 5:42 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH Question
- Replies: 2
- Views: 170
pH Question
Will there ever be a time where there are absolutely zero Hydronium ions or absolutely zero Hydroxide ions in a solution or will there always be at least a little of each in a solution?
- Wed Dec 02, 2020 6:45 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: The HCl + H2O example
- Replies: 4
- Views: 228
The HCl + H2O example
I missed why the H atom from the HCl moves over to the H2O atom to form H3O. Did that happen because of the strength of the lone pairs on O? If not, can someone please explain why this happens?
Thanks
Thanks
- Thu Nov 26, 2020 8:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why are chemists good at solving problems? They have all the solutions
- Thu Nov 26, 2020 8:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Did you hear about the guy who was cooled to absolute zero? He's 0K now.
- Thu Nov 26, 2020 8:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
A photon walks into a hotel and is asked if he needs help with his luggage. He says "no thanks. I'm traveling light."
- Wed Nov 25, 2020 11:30 am
- Forum: Hybridization
- Topic: Chelate example from the lecture
- Replies: 1
- Views: 38
Chelate example from the lecture
The example from the lecture was something like CoCl2(NH2)4. Prof. Lavelle described a chelate as a complex containing a ligand that forms a ring of atoms that include the central metal atom. He then drew a ring connecting the NH2s and the Co but the Cl atoms didn't seem to be a part of the ring. Is...
- Mon Nov 23, 2020 7:03 pm
- Forum: Hybridization
- Topic: Confusion About Hybridization
- Replies: 3
- Views: 175
Confusion About Hybridization
Why is it that sp3 hybridization has 4 hybrid orbitals while sp2 hybridization uses 3 hybrid orbitals and 1 p orbital? I'm having a hard time understanding why those two work differently. Like why wouldn't sp2 have 4 hybrid orbitals as well?
- Fri Nov 20, 2020 9:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Anyone know any jokes about Sodium?
Na
Na
- Fri Nov 20, 2020 8:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trends in Pi vs Sigma Bonds?
- Replies: 3
- Views: 130
Trends in Pi vs Sigma Bonds?
For example, do there tend to be more sigma bonds in a polar molecule? Or are there more pi bonds in a non polar molecule? Or is there even a pattern to it at all?
- Fri Nov 20, 2020 8:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining sigma and pi bonds in a molecule
- Replies: 1
- Views: 45
Determining sigma and pi bonds in a molecule
When given a molecule with a double bond, how do we determine which of the bonds (in the double bond) is sigma and which is pi?
- Wed Nov 18, 2020 11:44 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2 Central Atoms?
- Replies: 3
- Views: 189
2 Central Atoms?
In the last example of the lecture with Cis and Trans Dichloroethene, it had two carbons in the middle that were double bonded to each other and each single bonded to a Hydrogen and a Chlorine. The reason I ask is that when determining the shape, would I begin with A2? All of the other examples in t...
- Wed Nov 18, 2020 11:07 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs As Far As Possible From each other example?
- Replies: 2
- Views: 177
Lone Pairs As Far As Possible From each other example?
With water, we see that the lone pairs have to be close to each other so that it decreases the bond angle below 180 degrees. But what would be an instance where the lone pairs are as far as possible from each other? Thanks
- Fri Nov 13, 2020 11:16 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shapes
- Replies: 3
- Views: 86
Re: Molecular Shapes
It's just everything up to Wednesday and the last few sections of outline 2
- Fri Nov 13, 2020 11:15 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Rules for Assigning Shape
- Replies: 6
- Views: 261
Rules for Assigning Shape
Can you only assign shape to a molecule if all of the bond angles are the same? For example, CH4 was tetrahedral because all angles were 109.5 degrees. But We didn't assign a shape to NH3 in the lecture because the lone pair had more repelling power. Why is this the case?
- Wed Nov 11, 2020 5:52 pm
- Forum: Ionic & Covalent Bonds
- Topic: Hydrogen Bond Homework Question
- Replies: 3
- Views: 101
Hydrogen Bond Homework Question
In one of the homework problems, it asks which can form a hydrogen bond out of H-Cl, H-I, H-Br, and H-F. The answer was H-F because it was the only one of the four where the H was bonded to either N, O, or F, but I also noticed that the difference between the electronegativities of H and F was great...
- Mon Nov 09, 2020 8:57 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic/Covalent
- Replies: 8
- Views: 303
Re: Ionic/Covalent
I don't think it's that the bonds are both ionic and covalent at the same time. I think it's that bonds often have properties of both. For example, and ionic bond occurs between two oppositely charged atoms. This is similar to how a polar covalent bond acts. Like how water has a more negative Oxygen...
- Mon Nov 09, 2020 8:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: "Interactions that Give Rise to Attractive forces" Question
- Replies: 2
- Views: 135
"Interactions that Give Rise to Attractive forces" Question
In lecture, Dr. Lavelle talks about Ion-Ion and Ion-Dipole interactions for example. In the ion-ion interaction a -250kJ/mol number is attached to it. I'm a little confused about where this number comes from and why it is negative. Any help would be appreciated. Thanks!
- Sat Nov 07, 2020 9:52 am
- Forum: Lewis Structures
- Topic: lewis structure
- Replies: 17
- Views: 567
Re: lewis structure
If the molecule has an overall positive charge then you add a + to the outside and if it has an overall negative charge, you add a - to the outside
- Sat Nov 07, 2020 9:50 am
- Forum: Lewis Structures
- Topic: Determining when to add more shared electron pairs to atoms that don't follow the octet rule
- Replies: 1
- Views: 104
Determining when to add more shared electron pairs to atoms that don't follow the octet rule
When I am drawing Lewis structures of atoms, I am confused about when to add an extra pair of electrons to atoms. For example, in the homework, I had to draw the phosphate ion (PO4 3-) and the correct answer had me add 3 single bonds and a double bond from the P atom to the O atoms. Why wouldn't it ...
- Fri Nov 06, 2020 10:57 am
- Forum: Lewis Structures
- Topic: Ionic vs. Covalent bond concepts
- Replies: 3
- Views: 115
Ionic vs. Covalent bond concepts
In lecture, prof. Lavelle says that most bonds have both ionic and covalent character. He then describes how a molecule that has two atoms with unequal pull on electrons has ionic characteristics. Does this mean that a polar covalent bond has ionic characteristics?
- Fri Nov 06, 2020 10:49 am
- Forum: Lewis Structures
- Topic: Simplifying Formal Charge?
- Replies: 3
- Views: 135
Simplifying Formal Charge?
Hi, I'm running into homework problems that say my answer is wrong if I don't simplify the formal charge. How would one decide whether they have to simplify it or not, and what does it mean to do so? Thanks
- Mon Nov 02, 2020 12:02 pm
- Forum: Lewis Structures
- Topic: Differences in Bond Length
- Replies: 6
- Views: 523
Differences in Bond Length
I'm a little unclear as to what accounts for differences in bond length. Why were double bonds about 120 Angstroms and Single bonds 140 Angstroms?
- Fri Oct 30, 2020 12:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
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.
- Fri Oct 30, 2020 11:56 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Shorthand Question
- Replies: 5
- Views: 256
Electron Configuration Shorthand Question
There was a homework problem that asked for the electron configuration of Si and the answer started off with [Ne]. Just curious, why not start off with [Al] (the element immediately preceding Si) so you only have to write [Al]3p2? Is there a rule against doing that?
- Wed Oct 28, 2020 1:27 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy vs. Threshold energy
- Replies: 3
- Views: 107
Ionization Energy vs. Threshold energy
Threshold energy is the amount of energy it took to remove an electron from a metal surface in the photoelectric effect experiment. Is ionization energy the same principle as threshold energy since it's the amount of energy needed to remove an electron from an atom? Or are they two different concept...
- Mon Oct 26, 2020 12:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Determining Spin in orbitals [ENDORSED]
- Replies: 5
- Views: 251
Determining Spin in orbitals [ENDORSED]
In the lecture, when prof. Lavelle was finished writing down the shell letters and numbers, he started drawing arrows. I noticed how he drew 3 up arrows before complementing them with down arrows. Why did he do this and how did he know how many arrows to put? Thanks.
- Mon Oct 26, 2020 11:46 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbital vs. Subshell
- Replies: 13
- Views: 797
Orbital vs. Subshell
What's the difference between an orbital and a sub shell?
- Fri Oct 23, 2020 12:13 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Determining Quantum Numbers
- Replies: 1
- Views: 152
Determining Quantum Numbers
Would someone be able to explain how Prof. Lavelle determined the 4 quantum numbers from the 5s orbital? Thanks
- Wed Oct 21, 2020 12:17 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 10^-15 Question
- Replies: 3
- Views: 147
10^-15 Question
Does the fact that having a diameter that is 10^-15 is too small to be possible have anything to do with the fact that the smallest detectable wavelength is 10^-15 also?
- Mon Oct 19, 2020 12:16 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Units
- Replies: 4
- Views: 193
De Broglie Units
Will the mass in the denominator of the De Broglie equation always be in kilograms?
- Mon Oct 19, 2020 12:08 pm
- Forum: DeBroglie Equation
- Topic: At What Point does wavelength become undetectable?
- Replies: 8
- Views: 313
At What Point does wavelength become undetectable?
What is the smallest exponent that would be a detectable wavelength? Thanks!
- Fri Oct 16, 2020 12:28 pm
- Forum: Properties of Light
- Topic: Showing Destructive Interference?
- Replies: 5
- Views: 276
Showing Destructive Interference?
The experiment that shows constructive interference causes light to be indirectly shown behind a part of the screen where there is no opening, but what would destructive interference look like in an example like this?
- Wed Oct 14, 2020 11:38 am
- Forum: Properties of Electrons
- Topic: Lyman vs. Balmer series
- Replies: 20
- Views: 1853
Lyman vs. Balmer series
I see that the transitions are longer between energy levels in the Lyman series, but what are the main differences between the two?
- Wed Oct 14, 2020 11:15 am
- Forum: Properties of Electrons
- Topic: Analogy for Exciting Electrons?
- Replies: 3
- Views: 290
Analogy for Exciting Electrons?
When moving an electron from n=1 to n=2, would it be good to think to the E=hv as a bridge to get from one energy level to another?
- Wed Oct 14, 2020 11:13 am
- Forum: Properties of Electrons
- Topic: Electrons Excited or Ejected
- Replies: 19
- Views: 829
Re: Electrons Excited or Ejected
As I'm understand it from the lecture, I believe that being ejected means electrons leaving the atom altogether due to increased wave frequency, and being excited means moving from one energy level to another while still remaining within the atom.
- Mon Oct 12, 2020 12:35 pm
- Forum: Properties of Light
- Topic: Changing Intensity vs Changing Wavelength
- Replies: 7
- Views: 345
Changing Intensity vs Changing Wavelength
Just to clarify, when one changes INTENSITY of the light, it means making the light brighter or dimmer vs. when one changes the WAVELENGTH of light, it means changing, for example, from visible light rays to UV rays?
- Mon Oct 12, 2020 12:04 pm
- Forum: Properties of Light
- Topic: Going from Classical Mechanics to Quantum Mechanics [ENDORSED]
- Replies: 2
- Views: 177
Going from Classical Mechanics to Quantum Mechanics [ENDORSED]
In the lecture, Dr. Lavelle talks about turning the nozzle of a watering can so that the opening is so small that only individual units of water molecules are coming out at a time. At what point/unit size should we stop considering going the classical mechanics route and focus on quantum mechanics?
- Sun Oct 11, 2020 10:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
I'd tell another chemistry joke but it looks like all the good ones ARGON
- Sun Oct 11, 2020 10:50 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2985479
Re: Post All Chemistry Jokes Here
Why did the attacking army use ACID weapons?
To neutralize the enemy BASE
To neutralize the enemy BASE
- Sun Oct 11, 2020 10:48 pm
- Forum: Balancing Chemical Reactions
- Topic: Fractions
- Replies: 26
- Views: 734
Re: Fractions
In order to avoid fractions, multiply both sides by 2 just as you would in a math problem
- Sun Oct 11, 2020 10:46 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing equations.
- Replies: 35
- Views: 2492
Re: Balancing equations.
I write down how many of each element are on each side of the equation. For example in NH3 + O2 --> N2 + H2O 1N 2N 3H 2H 2O. 1O From here, I add numbers to the equation and change them in my list underneath until all numbers match on both sides.
- Sun Oct 11, 2020 10:38 pm
- Forum: Empirical & Molecular Formulas
- Topic: Sapling Question #10
- Replies: 3
- Views: 161
Re: Sapling Question #10
I had to determine what composes 2-butanone to find the g/mole.