Search found 64 matches

by Darren1j
Thu Jan 21, 2021 8:04 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

Why did the white bear dissolve in water?........Because it was polar! ( no? okay)
by Darren1j
Mon Jan 18, 2021 8:54 am
Forum: Student Social/Study Group
Topic: New Joke Chain
Replies: 27
Views: 91

Re: New Joke Chain

You think you’re a 10? On the pH scale, maybe — because you’re basic.
by Darren1j
Sun Jan 17, 2021 7:14 pm
Forum: Student Social/Study Group
Topic: New Joke Chain
Replies: 27
Views: 91

Re: New Joke Chain

Why do chemists favor nitrates?
Because they are way more affordable than the day rates!
by Darren1j
Sun Jan 17, 2021 1:15 pm
Forum: Student Social/Study Group
Topic: New Joke Chain
Replies: 27
Views: 91

Re: New Joke Chain

when potassium and oxygen went on their first date, it turned out fine. The second time that oxygen went on a date with potassium it was OK2
by Darren1j
Sun Jan 17, 2021 1:13 pm
Forum: Student Social/Study Group
Topic: New Joke Chain
Replies: 27
Views: 91

Re: New Joke Chain

Nick P 3D wrote:H2O is water and H2O2 is hydrogen peroxide.
What is H2O4?

Drinking


Day 5 still trying to figure out the meaning of this joke.
by Darren1j
Wed Jan 13, 2021 8:23 pm
Forum: Ideal Gases
Topic: Sampling hw #4
Replies: 15
Views: 138

Re: Sampling hw #4

For the longest time I kept getting it wrong because I didn't realize total pressure meant add all of the new equilibrium values.
by Darren1j
Tue Jan 12, 2021 10:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chem Equilibria
Replies: 6
Views: 27

Re: Chem Equilibria

In relation to this topic, why do we say that two reactants or products have the same x value. Don't different compounds have different amounts used in a reaction ( such as a limiting reactant)?
by Darren1j
Sat Jan 09, 2021 8:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

Gold is my favorite part of the periodic table because it is AU-some!
by Darren1j
Sat Jan 09, 2021 4:29 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

I need someone to look after my electron today, do you mind keeping a ion it for me?
by Darren1j
Sat Jan 09, 2021 4:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Question 4
Replies: 5
Views: 50

Re: Sapling Question 4

I was confused as to what the K value means for the reverse reaction, but this explanation cleared it up a lot because both reactions take place simultaneously.
by Darren1j
Thu Jan 07, 2021 10:56 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gibbs free energy in Relation to K
Replies: 3
Views: 20

Re: Gibbs free energy in Relation to K

Two of the sapling questions revolve around K and change in enthalpy. Thus in reactions with a + change in enthalpy, they are endothermic, and increasing the temperature increases K. In a reaction with a negative change in enthalpy, it is exothermic, and an increase in temperature decreases K.
by Darren1j
Thu Jan 07, 2021 10:47 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #3
Replies: 11
Views: 82

Re: Sapling #3

I just set up my problem like [HI^2]/ [H2][I2] =53.3. I know this doesn't yield the right answer, but why?
by Darren1j
Thu Jan 07, 2021 10:44 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #3
Replies: 11
Views: 82

Re: Sapling #3

Why is it 2x. I thought the fact that there is 2HI is accounted for in the HI^2?
by Darren1j
Fri Dec 11, 2020 10:46 pm
Forum: General Science Questions
Topic: Grade Breakdown
Replies: 32
Views: 351

Re: Grade Breakdown

Basically if this class follows basic grading scales (93% for A, etc) then you can miss 35 points total to get an A and 50 points for an A-. This is only IF it follows the way other classes do it, but it very well could be different.
by Darren1j
Fri Dec 11, 2020 10:43 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 18
Views: 110

Re: Final

I've been going back and doing the textbook problems and found a bunch of the midterm questions on there. Dr. Lavelle doesnt lie haha.
by Darren1j
Fri Dec 11, 2020 10:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

What does a chemist say when in pain? "Ouch that HERTZ!"
by Darren1j
Fri Dec 11, 2020 10:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

Why would Dr. Lavelle be like every other professor and not dance at the start of lectures? If he didn't, he'd be pretty Basic.
by Darren1j
Thu Dec 10, 2020 11:44 am
Forum: Identifying Acidic & Basic Salts
Topic: Strong Acid Names
Replies: 6
Views: 57

Re: Strong Acid Names

This is a great tip! Has anyone come up with one for strong bases?
by Darren1j
Fri Dec 04, 2020 9:00 pm
Forum: Student Social/Study Group
Topic: Professor Lavelle's hat
Replies: 17
Views: 220

Re: Professor Lavelle's hat

Don't worry guys, I'm working on a still image magnifying program to figure out this intense problem.
by Darren1j
Fri Dec 04, 2020 8:58 pm
Forum: General Science Questions
Topic: Enrolling in Chem 14B and BL simultaneously?
Replies: 14
Views: 154

Re: Enrolling in Chem 14B and BL simultaneously?

I've heard people say its good to take it with chem 14c. Would anyone recommend taking it over the summer or would taking it during the year be better?
by Darren1j
Fri Dec 04, 2020 8:56 pm
Forum: Student Social/Study Group
Topic: Practice Exam for Final
Replies: 23
Views: 247

Re: Practice Exam for Final

By studying homework problems, are you referencing sapling or the textbook?
by Darren1j
Wed Dec 02, 2020 9:39 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 212
Views: 142732

Re: Rusty on High School Chem [ENDORSED]

Having retuned from taking the section on coordination compounds and Iron, being rusty on chemistry is a pun in itself.
by Darren1j
Wed Dec 02, 2020 9:37 am
Forum: Naming
Topic: Ligand Names Table on Final
Replies: 10
Views: 82

Re: Ligand Names Table on Final

on the sheet, theres the two names for every ligand. Why did IUPAC decide to change the names?
by Darren1j
Sun Nov 29, 2020 9:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

What is a cation afraid of?
.... A dogion.
by Darren1j
Sun Nov 29, 2020 7:14 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 86
Views: 864

Re: Big Sad: Midterm 2

Wish me luck guys, I'm planning on being at a session everyday this week. After this midterm, I am confident in myself but know that I made plenty of easy mistakes. I have faith in all of you!
by Darren1j
Sun Nov 29, 2020 7:12 pm
Forum: Student Social/Study Group
Topic: Happy Thanksgiving!
Replies: 38
Views: 285

Re: Happy Thanksgiving!

Our tradition is that my mom gets to not cook, and every one else in the family has to impress her with our creations. We try to be creative, and this year we tried variations of mac and chees, mashed potatoes, BBQ turkey and ribs, brussels sprouts etc. I personally never really cook so it is my one...
by Darren1j
Sun Nov 29, 2020 7:09 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 226
Views: 35987

Re: Final Jitters

I usually set a time the day before a test to STOP studying and start relaxing. Theres a trade off between studying and de stressing, and if you cram too much the day before, the balance will get disrupted. You should do all the textbook problems that you can, and go to as many workshop, US, step up...
by Darren1j
Wed Nov 25, 2020 10:19 am
Forum: General Science Questions
Topic: Finals
Replies: 39
Views: 373

Re: Finals

Also, how can you calculate what grade you need on the final to get an A?
by Darren1j
Wed Nov 25, 2020 10:19 am
Forum: General Science Questions
Topic: Finals
Replies: 39
Views: 373

Re: Finals

Anyone know how many questions will be on the final?
by Darren1j
Tue Nov 24, 2020 6:41 pm
Forum: Administrative Questions and Class Announcements
Topic: CHEM14B Asynchronous
Replies: 5
Views: 98

Re: CHEM14B Asynchronous

I am wondering whether to wait on switching one of my classes to not overlap with one of his chem lectures. Would the midterms probably be in the middle of the week (wednesday)? Was this how it was in the past?
by Darren1j
Sun Nov 22, 2020 2:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tips for memorizing different molecular shapes
Replies: 9
Views: 76

Re: Tips for memorizing different molecular shapes

Speaking of memorizing the shapes, does anyone know the scientific origination of the sea saw VSEPR shape? It seems like a pretty unacademic term which makes it funny to learn about.
by Darren1j
Sun Nov 22, 2020 2:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 47
Views: 263

Re: Lone Pair E-

Why are lone pairs more "diffuse" or take up a larger space than bonding pairs do? Since they all are areas of electron density
by Darren1j
Wed Nov 18, 2020 11:09 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

have you heard the new remix of girls just want to have fun? It goes something like "Hydrogens' just want to have FON..."
by Darren1j
Fri Nov 13, 2020 4:30 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: H-F H-F Hydrogen Bonding vs Dipole-Dipole
Replies: 11
Views: 83

Re: H-F H-F Hydrogen Bonding vs Dipole-Dipole

I had this same question and I think there's a reason for that difference. In this case H-F H-F, I think its classified as a hydrogen bond and therefore would be -20 but other dipole-dipole interactions that are not hydrogen bonding would be around -2. H Bond is Dipole-Dipole, but dipole- dipole doe...
by Darren1j
Fri Nov 13, 2020 4:20 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: Helpful Summary of What Induced Dipole- Induced Dipole depends on
Replies: 6
Views: 73

Re: Helpful Summary of What Induced Dipole- Induced Dipole depends on

I just wanted to ask, why do molecules have fluctuating electron densities? N2 should both be equally electronegative but what causes fluctuations? (as it relates to Van der waals forces)
by Darren1j
Mon Nov 09, 2020 10:11 am
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B Enrollment
Replies: 27
Views: 310

Re: Chem 14B Enrollment

Like the above question asked, did Dr. Lavelle mention that 14b will be asynchronous as well?
by Darren1j
Mon Nov 09, 2020 9:51 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

Are you made of copper and tellurium? Because you are Cu Te
by Darren1j
Mon Nov 09, 2020 9:49 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

The kids were mad at their teacher because they wanted to know why they're answer was incorrect. The chemistry teacher replied, " I am a chem teacher, if I don't have a solution, I'll make one up!."
by Darren1j
Fri Nov 06, 2020 6:35 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 5
Views: 38

Re: Polarizing Power

Could someone explain the differences in molecular structure between increasing anion vs increasing cation size? Also, How does polarizing power relate to distortion?
by Darren1j
Thu Nov 05, 2020 11:17 am
Forum: Octet Exceptions
Topic: Radicals
Replies: 7
Views: 48

Re: Radicals

Are radicals only produced when a large amount of energy is provided to make the bonds break? Why doesn't the compound break into two stable molecules instead?
by Darren1j
Wed Nov 04, 2020 10:05 am
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B and 14BL [ENDORSED]
Replies: 12
Views: 3882

Re: Chem 14B and 14BL [ENDORSED]

I had this same question so I was wondering if someone can provide some more recent insight. Or do the same ideas mentioned earlier still hold true?
by Darren1j
Sun Nov 01, 2020 11:29 pm
Forum: Lewis Structures
Topic: Dot order
Replies: 11
Views: 103

Re: Dot order

I was also going to ask if Hund's rule applies to Lewis dot structures because Lavelle had shown Oxygen with 3 pairs of electrons rather than 2 pairs and 2 single electrons around the O.
by Darren1j
Sun Nov 01, 2020 11:17 pm
Forum: Ionic & Covalent Bonds
Topic: Differences in structures between ionic and covalent bonds
Replies: 7
Views: 71

Re: Differences in structures between ionic and covalent bonds

can someone simply explain why one is stronger than the other.
by Darren1j
Sun Nov 01, 2020 11:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

Helium dimer seems like the funniest of molecules because he2 would be like He He.
by Darren1j
Sun Nov 01, 2020 11:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

What kind of dogs does Dr.Lavelle have? I'm going to take a wild guess and say laboratory retrievers
by Darren1j
Sun Nov 01, 2020 2:53 pm
Forum: Ionic & Covalent Bonds
Topic: Octet Rule Lecture 12
Replies: 7
Views: 44

Re: Octet Rule Lecture 12

How do you know whether an atom has to gain electrons to fill its shell to become stable, or lose enough electrons to drop to the lower shell to be most stable?
by Darren1j
Sun Nov 01, 2020 2:50 pm
Forum: Ionic & Covalent Bonds
Topic: Van Der Waals radius
Replies: 4
Views: 43

Re: Van Der Waals radius

Referring to general atomic radius, why does gaining an electron make the radius bigger and losing an electron make the radius smaller?
by Darren1j
Sun Oct 25, 2020 5:59 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module Question
Replies: 4
Views: 69

Re: Photoelectric Effect Module Question

Hey, I have question from this same module. Question 30. "Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. .... What is the frequency of the incident light on the sodium metal surface?" Are you s...
by Darren1j
Fri Oct 23, 2020 11:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 92
Views: 2083

Re: Advice for studying

I think its best to spread out studying through the week and to do all the things that the people above had mentioned. Read the textbook before the lecture, and then try to do the hw problems. If you want more practice try the audio-visual focus assignments and attend some of the over 40 hors of hel...
by Darren1j
Fri Oct 23, 2020 11:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

I told this one to my mom earlier ^. Sadly, I got no reaction :(
by Darren1j
Fri Oct 23, 2020 11:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

I'm sad that the jokes on here have slowed down. They used to be posted everyday, but now they only happen periodically.
by Darren1j
Wed Oct 21, 2020 7:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Week 2,3,4 Question 13
Replies: 2
Views: 36

Week 2,3,4 Question 13

This question asks "How many electrons in an atom could have these sets of quantum numbers?"
a) n= 2
b) n=5, l=1
c)n=7, l=1 m (subscript l) =-1

Can someone clarify how to use the n and l values for this question and their application in general.
by Darren1j
Wed Oct 21, 2020 5:40 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Calculating Velocity
Replies: 5
Views: 70

Re: Calculating Velocity

I understand what the uncertainty is, because we cannot measure the exact momentum and position of an electron but how do they even determine the "amount" of uncertainty.
by Darren1j
Wed Oct 21, 2020 9:16 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 11
Views: 129

Re: Rydberg Equation

So I remember him saying R= 3.29x10^15hz, but when I look it up online it says it is 1.0874x10^-7 m^-1. Are they the same in different units?
by Darren1j
Sun Oct 18, 2020 12:40 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Sapling Week 2 & 3 HW Problem 5
Replies: 7
Views: 97

Re: Sapling Week 2 & 3 HW Problem 5

The posts above ^ helped me figure this out. Basically, going from a higher level to a lower level causes spectral lines. To find the range of wavelengths, you must use the Rydberg equation. You use the n=7 to n=6 for the first wavelength and n=7 to n=1 for the second wavelength. The equation is v (...
by Darren1j
Sat Oct 17, 2020 11:00 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 44

Re: Rydberg Equation

Going forward then, would we use the equation or the multistep process for these problems?
by Darren1j
Fri Oct 16, 2020 11:57 am
Forum: Student Social/Study Group
Topic: Textbook vs Lectures vs Other Methods
Replies: 17
Views: 132

Textbook vs Lectures vs Other Methods

A question to anyone in 14a currently or who have already taken the class. How prepared are you for the tests by just watching the lectures, attending discussions and doing the sapling homework. Does reading the textbook thoroughly help significantly? What are ways you have found to be successful in...
by Darren1j
Wed Oct 14, 2020 8:51 pm
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 565

Re: What is Black Body?

If it absorbs all light, and you need light to be reflected off an object to see it, would a black body be ... invisible? How would that work? In fact, how would a black hole look through a telescope if we could get near one?
by Darren1j
Mon Oct 12, 2020 10:58 am
Forum: Photoelectric Effect
Topic: Where does photon energy go if it does not emit an electron?
Replies: 6
Views: 69

Re: Where does photon energy go if it does not emit an electron?

If the energy of the light is equal to the energy needed to remove an electron, how much energy is left for the electron to travel with (its velocity)?
by Darren1j
Sun Oct 11, 2020 3:17 pm
Forum: Limiting Reactant Calculations
Topic: How do we find the amount of oxygen in combustion?
Replies: 10
Views: 525

Re: How do we find the amount of oxygen in combustion?

Why does combustion always result in H2O and CO2 and not other compounds?
by Darren1j
Sun Oct 11, 2020 3:15 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Calculating Molar Mass (Sapling Week 1 #10)
Replies: 6
Views: 78

Re: Calculating Molar Mass (Sapling Week 1 #10)

I get that the name is supposed to give you information about the compounds and molecules in it, but can someone explain how you would get it from the compound name OP had mentioned above? Like how would you know the number of C, H and O's?
by Darren1j
Fri Oct 09, 2020 11:37 am
Forum: SI Units, Unit Conversions
Topic: Rounding
Replies: 20
Views: 160

Re: Rounding

Some elements of the periodic table have 4 sig figs as their molar mass and others have far more. When calculating the molar mass of a compound, how many sig figs should there be or number be rounded to?
by Darren1j
Fri Oct 09, 2020 11:32 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
by Darren1j
Fri Oct 09, 2020 11:30 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8517
Views: 1470804

Re: Post All Chemistry Jokes Here

Did you hear oxygen went on a date with potassium? It went OK..

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