Search found 53 matches
- Thu Dec 05, 2019 1:00 pm
- Forum: Air Pollution & Acid Rain
- Topic: final?
- Replies: 5
- Views: 58
Re: final?
I think it would be good to know it because in lecture Dr.Lavelle notes state to look at the acid rain topics in the textbooks
- Thu Dec 05, 2019 12:57 pm
- Forum: Hybridization
- Topic: writing hybridization
- Replies: 3
- Views: 11
Re: writing hybridization
the hybridization for the C atom is sp
- Thu Dec 05, 2019 12:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
What do you call an acid with an attitude?
a-mean-oh-acid
a-mean-oh-acid
naming
Can someone explain when do you use the prefixes bis,-tris-,tetrakis-, pentakis-?
- Thu Dec 05, 2019 12:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 225
- Views: 102111
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle for being such an amazing professor and can not wait to be in chem 14B with you next quarter!
- Mon Nov 25, 2019 5:45 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Why HF is a weaker acid than HCl
- Replies: 17
- Views: 751
Re: Why HF is a weaker acid than HCl
In this case, you are looking at the HF bond length vs the HCL bong length. Since Florine is more elctronegative than Cl, it will have a stronger pull on the H make it harder to donate the H. The longer the bond, the easier it is to remove the H. It follows one of three rules in the book for strong...
- Mon Nov 25, 2019 5:44 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
Why did the military use acid?
To neutralize the enemy base.
To neutralize the enemy base.
- Mon Nov 25, 2019 5:43 pm
- Forum: Bronsted Acids & Bases
- Topic: List of strong/weak acids/bases
- Replies: 3
- Views: 118
Re: List of strong/weak acids/bases
Here is a list of the strong bases:
LiOH = lithium hydroxide, NaOH = sodium hydroxide, KOH = potassium hydroxide, RbOH = rubidium hydroxide, CsOH = cesium hydroxide, Ca(OH)2 = calcium hydroxide , Sr(OH)2 = strontium hydroxide, Ba(OH)2 = barium hydroxide
LiOH = lithium hydroxide, NaOH = sodium hydroxide, KOH = potassium hydroxide, RbOH = rubidium hydroxide, CsOH = cesium hydroxide, Ca(OH)2 = calcium hydroxide , Sr(OH)2 = strontium hydroxide, Ba(OH)2 = barium hydroxide
- Mon Nov 25, 2019 5:38 pm
- Forum: Bronsted Acids & Bases
- Topic: Sig Figs
- Replies: 4
- Views: 238
Re: Sig Figs
Every time my TA does a problem he always tells us to follow sig fig rules so I do not think you would get a lot of points taken off but it is important to know
- Mon Nov 25, 2019 5:33 pm
- Forum: Hybridization
- Topic: Sigma and Pi Bonds
- Replies: 21
- Views: 62
Re: Sigma and Pi Bonds
a single bond has one sigma bond, a double bond has one sigma and one pi bond, and a triple bond has one sigma and two pi bonds
- Mon Nov 25, 2019 5:26 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ground state?
- Replies: 6
- Views: 41
Re: Ground state?
it is the lowest energy state of an atom
- Fri Nov 22, 2019 11:59 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
Why can you never trust atoms?
A: They make up everything!
A: They make up everything!
- Fri Nov 22, 2019 11:57 am
- Forum: Hybridization
- Topic: hybridizing oxygen
- Replies: 5
- Views: 35
Re: hybridizing oxygen
To find the hybridization of an atom, you need to find its steric number. The steric number is calculated by adding the number of atoms bonded to the central atom plus the number of lone pairs on the central atom. In this case, because oxygen has 1 carbon bonded to it + 2 lone pairs, its steric num...
- Fri Nov 22, 2019 11:53 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final Studying
- Replies: 14
- Views: 90
Re: Final Studying
I plan on doing the homework questions, reviewing the midterm, and looking at past final tests if they are available.
- Fri Nov 22, 2019 11:46 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Bond Angles for Shapes with Lone Pairs
- Replies: 5
- Views: 39
Re: VSEPR Bond Angles for Shapes with Lone Pairs
looks to be all correct
- Fri Nov 22, 2019 11:44 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Tetrahedral and its polarity
- Replies: 6
- Views: 39
Re: Tetrahedral and its polarity
Kassidy Ford 1J wrote:If you have a molecule like CHF3, it will be polar because not all of the atoms surrounding the C are the same, but will that affect the bond angles or do you still assume that it is 109.5
I believe it will have bond angles of 109.5 since the shape is still tetrahedral.
- Fri Nov 15, 2019 1:20 pm
- Forum: Dipole Moments
- Topic: London forces
- Replies: 9
- Views: 48
Re: London forces
London forces are always present in each molecule.
- Fri Nov 15, 2019 1:14 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bond
- Replies: 7
- Views: 43
Re: Hydrogen Bond
Hydrogen bonds are formed when H is bonded to F,O,N. Easy way I was taught to remember if it is a hydrogen bond was if Hydrogen was bonded to Freak Of Nature.
- Fri Nov 15, 2019 1:10 pm
- Forum: Dipole Moments
- Topic: Test 2
- Replies: 3
- Views: 30
Re: Test 2
TA's have been saying to study everything we have learned after the midterm until lecture this Friday.
- Fri Nov 15, 2019 1:08 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
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.
- Fri Nov 15, 2019 1:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lewis Structures & VSEPR
- Replies: 9
- Views: 38
Re: Lewis Structures & VSEPR
It is not totally necessary but can be helpful to determine the shape of the molecule.
- Fri Nov 08, 2019 2:45 pm
- Forum: Coordinate Covalent Bonds
- Topic: Elements that can form coordinate covalent bonds
- Replies: 2
- Views: 28
Re: Elements that can form coordinate covalent bonds
I think two factors that help determine whether or not an element forms coordinate covalent bonds is electronegativity and the octet rule. Atoms that accept the two electrons should be "hungry" enough to take them, but this can also mean that they don't have a complete electron shell. Tha...
- Fri Nov 08, 2019 2:44 pm
- Forum: Sigma & Pi Bonds
- Topic: Single vs. Double bonds
- Replies: 15
- Views: 76
Re: Single vs. Double bonds
There are more electrons being shared so there is a greater attraction causing for shorter bonds.
- Fri Nov 08, 2019 2:36 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
kevinolvera1j wrote:nice joke,
Helium Helium Helium
This made me hehehe!! haha
- Fri Nov 08, 2019 2:34 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 18
- Views: 73
Re: Resonance Structures
There is more than one way to draw a lewis structure. For example the double bonds can move to another same element in the drawing.
- Fri Nov 08, 2019 2:29 pm
- Forum: Dipole Moments
- Topic: Dipole moments on Lewis structures
- Replies: 3
- Views: 22
Re: Dipole moments on Lewis structures
I feel like the question would ask for you to include the dipole moment but maybe include it just in case.
- Thu Oct 31, 2019 7:42 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
A neutron walks into a bar. He asks the bartender, "How much for a beer?"
The bartender gives him a smile and says, "For you, no charge"
The bartender gives him a smile and says, "For you, no charge"
- Thu Oct 31, 2019 7:41 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Why does formal charge indicate stability?
- Replies: 3
- Views: 40
Re: Why does formal charge indicate stability?
Zoya Mulji 1F wrote:since formal charge indicates the gain/loss of electrons while forming a covalent bond, it serves as a predictor for stability in a lewis structure. The structure with the least formal charge should be lower in energy and thereby be the better Lewis structure.
Thank you for explaining very well.
- Thu Oct 31, 2019 6:47 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
Why did the attacking army use acid?
To neutralize the enemy's base!
To neutralize the enemy's base!
- Thu Oct 31, 2019 5:05 pm
- Forum: Lewis Structures
- Topic: Drawing lewis structures
- Replies: 8
- Views: 49
Re: Drawing lewis structures
since he has not gone over it I would not worry to much about it
- Thu Oct 31, 2019 5:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
Did you hear about oxygen’s date with potassium?
It went OK.
It went OK.
- Thu Oct 31, 2019 5:02 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
Did you hear about oxygen’s date with potassium?
It went OK.
It went OK.
- Thu Oct 24, 2019 8:40 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: order of electron configuration
- Replies: 4
- Views: 27
Re: order of electron configuration

This should help in writing electron configurations
- Thu Oct 24, 2019 8:35 pm
- Forum: Trends in The Periodic Table
- Topic: Homework Question 1F.19
- Replies: 5
- Views: 38
Re: Homework Question 1F.19
Since s-block has a much lower ionization energy than the p-block so they lose electrons with less energy making them highly reactive
- Thu Oct 24, 2019 8:29 pm
- Forum: Lewis Structures
- Topic: Where to start putting dots for electrons
- Replies: 10
- Views: 69
Re: Where to start putting dots for electrons
There are no rules but I was taught that you should put a pair of valence electrons on each element before putting another pair on the first element you did
- Thu Oct 24, 2019 8:23 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 17
- Views: 137
Re: Midterm
I feel like everything we have learned so far will be on the midterm, but hopefully they mention what the midterm will consist of soon.
- Thu Oct 24, 2019 8:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
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 18, 2019 3:25 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions
- Replies: 4
- Views: 23
Re: Exceptions
There are other exceptions but Dr.Lavelle mentioned that we will only be looking at the first row of the d-block so Cr and and Cu are the only ones we need to know.
- Fri Oct 18, 2019 3:16 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Post All Chemistry Jokes Here
Adelpha Chan 1B wrote:Q: Wanna hear a joke about sodium hypobromite?
A: NaBrO.
This was such a good joke. Thanks for the laugh.
- Fri Oct 18, 2019 3:15 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7726
- Views: 1043131
Re: Chemistry Jokes
I heard Potassium and Oxygen went on a date....It went OK Q: What do you do with a sick chemist? A: If you can't helium, and you can't curium, then you might as well barium Q: What is the name of 007's Eskimo cousin? A: Polar Bond My high school chemistry had the first joke up all year and it alway...
- Fri Oct 18, 2019 3:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: G orbital
- Replies: 6
- Views: 38
Re: G orbital
Chantel_4B wrote:The G orbital does exist, but in their ground state, electrons are not in the G orbital, so it is therefore not represented on the periodic table.
Thank you for saying this. I had never heard of the G orbital before
- Fri Oct 18, 2019 3:12 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: electron configuration
- Replies: 4
- Views: 35
electron configuration
Why does 3d go before 4s in the electron configuration? I learned before it was 4s then 3d.
- Fri Oct 11, 2019 11:14 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty in Speed [ENDORSED]
- Replies: 18
- Views: 746
Re: Uncertainty in Speed [ENDORSED]
andrewcj 4I wrote:One additional thing for my reply, make sure you convert nm to m.
thanks for clarifying this.
- Fri Oct 11, 2019 11:03 am
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect vs Atomic Spectrum
- Replies: 2
- Views: 24
Re: Photoelectric Effect vs Atomic Spectrum
The photoelectric effect is an experiment that discovered light has the properties of particles. The equation of calculating the energy of a photon E=hv comes from this experiment. The electrons will only be ejected when the energy is greater than or equal to the threshold energy (work function), a...
- Fri Oct 11, 2019 11:02 am
- Forum: Einstein Equation
- Topic: Planck's constant
- Replies: 9
- Views: 109
Re: Planck's constant
Planck's constant is 6.626 x10^-34 J s. It is used to relate the energy of a particle to its frequency. The equation E=hv, we can be manipulated to h=E/v. Therefore, h or Planck's constant gives the ratio of energy to frequency and its relationship between these two variables. Thank you for your ex...
- Fri Oct 11, 2019 10:59 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength Plausibility
- Replies: 30
- Views: 727
Re: Wavelength Plausibility
APatel_4A wrote:He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!
Thank you for clarifying .
- Fri Oct 11, 2019 10:57 am
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 1421
Re: Week 2 Homework Problems [ENDORSED]
For week 3 we should only be submitting problems from the quantum section. We were allowed to submit fundamentals problems for week 2 because so many students were still preparing for the test, and he didn't want us to have to confuse ourselves with new material before it. Yes you should be doing t...
- Fri Oct 11, 2019 10:54 am
- Forum: Administrative Questions and Class Announcements
- Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
- Replies: 53
- Views: 2141
Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
What was the scam for workshops that Dr. Lavelle mentioned in lecture? Something to do with asking for our phone numbers? Yeah he mentioned it in my lecture which was at 2. He said in one of his earlier lectures there was a piece of paper going around to sign up for workshops. It asked for your nam...
- Thu Oct 03, 2019 5:27 pm
- Forum: Properties of Electrons
- Topic: Wave Properties of Electrons- Module Question
- Replies: 3
- Views: 276
Re: Wave Properties of Electrons- Module Question
The electrons have both wave-like and particle-like properties, and the photoelectric effect is a key example showing the particle-like property. The diffraction pattern observed during the experiment we went over in class is evidence that electrons have wave-like properties. As for the particle na...
- Thu Oct 03, 2019 5:26 pm
- Forum: Properties of Light
- Topic: Relationship Between Velocity and Wavelength
- Replies: 6
- Views: 97
Re: Relationship Between Velocity and Wavelength
In terms of the original question you asked - the relationship between velocity and wavelength for light is given by this equation: V = f\lambda Where V is the velocity of the wave in meters per second, \lambda (lambda) is the wavelength in meters, and f is the frequency, or cycles per second. I be...
- Wed Oct 02, 2019 11:04 am
- Forum: Photoelectric Effect
- Topic: photoelectric effect
- Replies: 2
- Views: 50
photoelectric effect
Calculate the energy per photon of ultraviolet radiation of frequency 3.00 x 1015 Hz.
A. 12.4 J
B. 1.99 x 10 -11J
C. 3.16 x 10-19J
D. 1.99 x 10-18J
E. None of the above
A. 12.4 J
B. 1.99 x 10 -11J
C. 3.16 x 10-19J
D. 1.99 x 10-18J
E. None of the above
- Wed Oct 02, 2019 10:54 am
- Forum: Student Social/Study Group
- Topic: Study Group Fall 2019
- Replies: 32
- Views: 468
Re: Study Group Fall 2019
Yes this sounds good. I am interested.
- Wed Oct 02, 2019 10:42 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 128
- Views: 2256
Re: Advice from a Medical Student - Part II [ENDORSED]
Thank you for sharing your story! Thank you for the advice on what type of mindset to have.