Search found 53 matches

by nicole-4d
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
by nicole-4d
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
by nicole-4d
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
by nicole-4d
Thu Dec 05, 2019 12:53 pm
Forum: Naming
Topic: naming
Replies: 2
Views: 13

naming

Can someone explain when do you use the prefixes bis,-tris-,tetrakis-, pentakis-?
by nicole-4d
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!
by nicole-4d
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...
by nicole-4d
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.
by nicole-4d
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
by nicole-4d
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
by nicole-4d
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
by nicole-4d
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
by nicole-4d
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!
by nicole-4d
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...
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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...
by nicole-4d
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.
by nicole-4d
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
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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"
by nicole-4d
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.
by nicole-4d
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!
by nicole-4d
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
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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

Image
This should help in writing electron configurations
by nicole-4d
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
by nicole-4d
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
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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...
by nicole-4d
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
by nicole-4d
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.
by nicole-4d
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.
by nicole-4d
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...
by nicole-4d
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...
by nicole-4d
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 .
by nicole-4d
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...
by nicole-4d
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...
by nicole-4d
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...
by nicole-4d
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...
by nicole-4d
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
by nicole-4d
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.
by nicole-4d
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.

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