Search found 103 matches

by nicole-2B
Tue Mar 10, 2020 6:25 pm
Forum: Zero Order Reactions
Topic: 0 order
Replies: 8
Views: 90

Re: 0 order

by nicole-2B
Tue Mar 10, 2020 6:18 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalysts in balanced equations
Replies: 6
Views: 29

Re: catalysts in balanced equations

Tai Metzger 3K wrote:Yes, in other words, catalysts are present before and after a reaction whereas intermediates are only present during the reaction.

this is helped thank you!
by nicole-2B
Tue Mar 10, 2020 6:17 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Intermediate
Replies: 3
Views: 32

Re: Intermediate

Qiu Ya Wu 4I wrote:For the image above, it's good to know that only one intermediate will be formed since the reaction profile indicates a 2 step process and the intermediate will be created in the first step and used as a reactant for the second step.

Thank you for clarifying on this
by nicole-2B
Tue Mar 10, 2020 6:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 275
Views: 130339

Re: Saying Thank You to Dr. Lavelle

Thank you Dr.Lavelle for yet another amazing quarter!!
by nicole-2B
Tue Mar 10, 2020 6:10 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Review Sessions
Replies: 2
Views: 40

Re: Review Sessions

Dr.Lavelle should send out an email soon but I feel like they might be
by nicole-2B
Wed Mar 04, 2020 10:40 pm
Forum: Second Order Reactions
Topic: [A] v. Time
Replies: 16
Views: 138

Re: [A] v. Time

Angela Patel 2J wrote:Would the slope of the graph be k?

yes the slope would be k
by nicole-2B
Wed Mar 04, 2020 10:37 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

When the chemical kinetics specialist is asked why he ran slowly, his reply was “I always wanted to be the significant rate-determining step”.
by nicole-2B
Wed Mar 04, 2020 10:36 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate-Determining Step
Replies: 4
Views: 46

Re: Rate-Determining Step

The rate-determining step is equivalent to the slow step. Therefore, by comparing each of the elementary steps' rate laws with the overall reaction rate law, you can determine which step is the rate-determining step: it's whatever step gives you a rate law identical to the overall reaction rate law...
by nicole-2B
Wed Mar 04, 2020 10:34 pm
Forum: First Order Reactions
Topic: Graph
Replies: 9
Views: 86

Re: Graph

should look linear and have a negative slope which is -k
by nicole-2B
Wed Mar 04, 2020 10:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Excellence in Chemistry Award!
Replies: 20
Views: 2854

Re: Excellence in Chemistry Award!

Congrats for doing so great in these classes!!
by nicole-2B
Tue Feb 25, 2020 8:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

JosephineF wrote:chem final outfit ideas

I love this so much !!
by nicole-2B
Tue Feb 25, 2020 8:42 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Pressure
Replies: 2
Views: 32

Re: Pressure

For cells that involve gases, such as hydrogen gas or chlorine gas, the pressure of these species matters. In these cases, the partial pressures of gases would probably be used over concentrations. Depending on the partial pressures, E would differ because of the nernst equation, E = Enot - (RT/NF)...
by nicole-2B
Tue Feb 25, 2020 8:33 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: homework question 6M.3
Replies: 2
Views: 63

Re: homework question 6M.3

galvanic cells have a positive potential difference so find the cathode and anode that makes E (naught) cell positive using the equation E(naught) cell= E (naught) cathode- E(naught) anode
by nicole-2B
Tue Feb 25, 2020 8:29 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: homework question 6L.9
Replies: 2
Views: 61

Re: homework question 6L.9

a) MnO4-(aq) +8H+(aq)+5e- yields Mn2+(aq) +4H2O (cathode half reaction)
5[Fe2+ (aq) yields Fe3+(aq)+e-] anode half reaction
Two equations together:
MnO4-(aq)+fFe2+(aq)+8H+(aq) yields Mn2+(aq) + Fe3+(aq) +4H20(l)
by nicole-2B
Wed Feb 19, 2020 11:32 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 14
Views: 315

Re: Anode and Cathode

Lydia Luong 4L wrote:Cathode is always on the right side of a cell diagram and anode is always on the left side.

Thank you!!
by nicole-2B
Wed Feb 19, 2020 11:20 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Why was the electrochemical cell arrested?
Because it was charged with battery.
by nicole-2B
Wed Feb 19, 2020 11:15 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum Electrode
Replies: 3
Views: 220

Re: Platinum Electrode

Matthew Tran 1H wrote:You need a solid platinum electrode when there is no conducting solid (except liquid mercury) in the cathode or anode reaction. That's all you need to know.

THANKS!!
by nicole-2B
Wed Feb 19, 2020 11:05 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n in -nFE
Replies: 14
Views: 186

Re: n in -nFE

Thanks for clarifying what n was. I was lost when doing the homework problems
by nicole-2B
Wed Feb 19, 2020 11:04 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Relationship between free energy and cell potential?
Replies: 2
Views: 31

Re: Relationship between free energy and cell potential?

Gibbs free energy is related to cell potential by the equation: ΔG°cell = −nFE°cell. If E°cell > 0, then the process is spontaneous. If E°cell < 0, then the process is nonspontaneous
by nicole-2B
Tue Feb 11, 2020 3:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Did you hear that Oxygen and Magnesium hooked up last night?
OMg
by nicole-2B
Tue Feb 11, 2020 3:51 pm
Forum: Phase Changes & Related Calculations
Topic: Negative Work
Replies: 18
Views: 213

Re: Negative Work

CynthiaLy4F wrote:Work will be negative when the system is doing the work, such as through expansion. Work is positive when is being done on the system, such as through compression.

this helps a lot thank you! I have been confused about this
by nicole-2B
Tue Feb 11, 2020 3:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 150
Views: 10385

Re: Advice from a Medical Student - Part II [ENDORSED]

Thanks for sharing your experience !!
by nicole-2B
Tue Feb 11, 2020 3:34 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: C in nCv ln (T2/T1)
Replies: 8
Views: 133

Re: C in nCv ln (T2/T1)

If it is under constant pressure C equals Cp=5/2*R for a monatomic gas
by nicole-2B
Tue Feb 11, 2020 3:32 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: qp=deltaH
Replies: 6
Views: 47

Re: qp=deltaH

TarynD_1I wrote:qp is equal to delta h when a system is at constant pressure, so no nonexpansion work is being done.

Thank you for clarifying!!
by nicole-2B
Tue Feb 04, 2020 6:19 pm
Forum: Phase Changes & Related Calculations
Topic: -w vs w
Replies: 15
Views: 102

Re: -w vs w

Brianna Becerra 1B wrote:When w is negative, it means that work is being done (expansion), while when it is positive, it is compression.

thanks for clarifying I have been so confused!!
by nicole-2B
Tue Feb 04, 2020 6:17 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: FORMULAS
Replies: 3
Views: 263

Re: FORMULAS

The equation sheet on Lavelle's website should have all the equations you need to use on an exam.
by nicole-2B
Tue Feb 04, 2020 6:12 pm
Forum: Calculating Work of Expansion
Topic: second equation
Replies: 8
Views: 48

Re: second equation

and this equation is used for reversible reactions only?
by nicole-2B
Tue Feb 04, 2020 6:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system
Replies: 8
Views: 56

Re: isolated system

Brooke Yasuda 2J wrote:a bomb calorimeter is tightly sealed and insulated which means that heat cannot be transferred with the surroundings. Also, the volume of the system cannot change so there can be no work done. This means that it is an isolated system.

thanks for explaining so well!!
by nicole-2B
Tue Feb 04, 2020 6:09 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Useful Summary of Thermodynamic Definitions
Replies: 34
Views: 14512

Re: Useful Summary of Thermodynamic Definitions

Nathan Rothschild_2D wrote:Will we have to know these terms for the test?

I believe so because they can be used to describe something. For example yesterday during Lyndon workshop one of these words was used to describe the system and it was needed to solve the problem.
by nicole-2B
Mon Jan 27, 2020 9:28 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

why do white bears dissolve in water?
because they are polar
by nicole-2B
Mon Jan 27, 2020 9:26 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Test 2
Replies: 7
Views: 72

Re: Test 2

everything after the midterm until test 2 begins
by nicole-2B
Mon Jan 27, 2020 9:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for enthalpy
Replies: 3
Views: 32

Re: Units for enthalpy

thanks for clarifying I was also confused about this
by nicole-2B
Mon Jan 27, 2020 9:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: bomb calorimeter
Replies: 8
Views: 658

Re: bomb calorimeter

Luis_Yepez_1F wrote:Work would be equal to zero, since volume is constant.

so when volume is constant work is equal to 0 in any case?
by nicole-2B
Mon Jan 27, 2020 9:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Week 4 Homework
Replies: 11
Views: 96

Re: Week 4 Homework

I would follow outline three from Lavelle's website
by nicole-2B
Tue Jan 21, 2020 9:00 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: van't hoff's equation
Replies: 3
Views: 28

Re: van't hoff's equation

we do not have to know this for the test since we did not learn this in class
by nicole-2B
Tue Jan 21, 2020 8:59 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 27
Views: 167

Re: X was ignored

you usually ignore the -x when the Ka or Kb is less than 10^-3 because it has little effect to the concentrations
by nicole-2B
Tue Jan 21, 2020 8:56 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Sig Figs for pH/pOH
Replies: 7
Views: 55

Re: Sig Figs for pH/pOH

significant figures for pH/pOH only counts after the decimal.
by nicole-2B
Tue Jan 21, 2020 8:55 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H20 in the ICE table
Replies: 26
Views: 180

Re: H20 in the ICE table

when performing a ice table you should only worry about the gasses and aqueous molecules
by nicole-2B
Tue Jan 21, 2020 8:50 pm
Forum: Ideal Gases
Topic: homework #3
Replies: 16
Views: 174

Re: homework #3

homework three can probably be on chemical equilibria as well since it will be on test one so it can be helpful to prepare with the hw questions
by nicole-2B
Wed Jan 15, 2020 10:59 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Why does hamburger yield lower energy than steak?
A: Because it's in the ground state.
by nicole-2B
Wed Jan 15, 2020 9:48 am
Forum: Ideal Gases
Topic: Partial Pressure
Replies: 8
Views: 73

Re: Partial Pressure

It is called partial pressure instead of just pressure because there are several gases in a given volume at once. Each gas has a certain amount of moles that occupies part of the total pressure. The sum of all the partial pressures of the gases present equals the total pressure. If only one gas was...
by nicole-2B
Wed Jan 15, 2020 9:45 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE charts on tests/exams
Replies: 8
Views: 64

Re: ICE charts on tests/exams

You should use ICE charts when needed! In my discussion, we mostly did ICE charts for weak acids and bases.
by nicole-2B
Wed Jan 15, 2020 9:44 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Which liquids to use
Replies: 7
Views: 45

Re: Which liquids to use

To add on, we don't include a pure liquid in an equilibrium calculation because it acts as the solvent in a chemical reaction and its change in concentration is relatively insignificant so in the K expression, the product concentration and reactant concentration would just cancel out. Thanks for ex...
by nicole-2B
Wed Jan 15, 2020 9:41 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Real reason explaining Le Chatelier's principle
Replies: 4
Views: 42

Re: Real reason explaining Le Chatelier's principle

When using PV=nRT you see there is an inverse relationship between P and V so when P increases V decreases and the reverse is also true.
by nicole-2B
Thu Jan 09, 2020 3:34 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 19
Views: 132

Re: Understanding Q

You solve for Q the same way you solve for K.
by nicole-2B
Thu Jan 09, 2020 3:27 pm
Forum: Ideal Gases
Topic: R constant in PV=nRT
Replies: 9
Views: 64

Re: R constant in PV=nRT

Gas constant, R = 8.314 J·K-1·mol-1 = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1= 62.364 L·Torr·K-1·mol-1
This is what was on the constants and formualas sheet on Dr. Lavelle's website.
by nicole-2B
Thu Jan 09, 2020 3:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Direction
Replies: 4
Views: 38

Re: Direction

If Q<K, then we know that the reaction will favor the forward reaction because there is not enough product for the reaction to be at equilibrium. If Q>K, then we know the reaction will favor the reverse reaction because there is not enough reactant for the reaction to be at equilibrium. Thanks for ...
by nicole-2B
Thu Jan 09, 2020 3:20 pm
Forum: Ideal Gases
Topic: K and Q
Replies: 8
Views: 409

Re: K and Q

NatBrown1I wrote:Because the concentration of solids and liquids are constant throughout the reaction.

Thank you!
by nicole-2B
Thu Jan 09, 2020 3:17 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

What animal is made up of calcium, nickel and neon?
A: A CaNiNe
by nicole-2B
Thu Dec 05, 2019 1:00 pm
Forum: Air Pollution & Acid Rain
Topic: final?
Replies: 5
Views: 138

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-2B
Thu Dec 05, 2019 12:57 pm
Forum: Hybridization
Topic: writing hybridization
Replies: 3
Views: 34

Re: writing hybridization

the hybridization for the C atom is sp
by nicole-2B
Thu Dec 05, 2019 12:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

What do you call an acid with an attitude?
a-mean-oh-acid
by nicole-2B
Thu Dec 05, 2019 12:53 pm
Forum: Naming
Topic: naming
Replies: 2
Views: 39

naming

Can someone explain when do you use the prefixes bis,-tris-,tetrakis-, pentakis-?
by nicole-2B
Thu Dec 05, 2019 12:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 275
Views: 130339

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-2B
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: 2462

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-2B
Mon Nov 25, 2019 5:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Why did the military use acid?
To neutralize the enemy base.
by nicole-2B
Mon Nov 25, 2019 5:43 pm
Forum: Bronsted Acids & Bases
Topic: List of strong/weak acids/bases
Replies: 3
Views: 182

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-2B
Mon Nov 25, 2019 5:38 pm
Forum: Bronsted Acids & Bases
Topic: Sig Figs
Replies: 4
Views: 300

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-2B
Mon Nov 25, 2019 5:33 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 21
Views: 114

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-2B
Mon Nov 25, 2019 5:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground state?
Replies: 6
Views: 168

Re: Ground state?

it is the lowest energy state of an atom
by nicole-2B
Fri Nov 22, 2019 11:59 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Why can you never trust atoms?
A: They make up everything!
by nicole-2B
Fri Nov 22, 2019 11:57 am
Forum: Hybridization
Topic: hybridizing oxygen
Replies: 5
Views: 62

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-2B
Fri Nov 22, 2019 11:53 am
Forum: Administrative Questions and Class Announcements
Topic: Final Studying
Replies: 14
Views: 166

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-2B
Fri Nov 22, 2019 11:44 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral and its polarity
Replies: 6
Views: 62

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-2B
Fri Nov 15, 2019 1:20 pm
Forum: Dipole Moments
Topic: London forces
Replies: 9
Views: 99

Re: London forces

London forces are always present in each molecule.
by nicole-2B
Fri Nov 15, 2019 1:14 pm
Forum: Dipole Moments
Topic: Hydrogen Bond
Replies: 7
Views: 126

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-2B
Fri Nov 15, 2019 1:10 pm
Forum: Dipole Moments
Topic: Test 2
Replies: 3
Views: 56

Re: Test 2

TA's have been saying to study everything we have learned after the midterm until lecture this Friday.
by nicole-2B
Fri Nov 15, 2019 1:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

What do you call a tooth in a glass of water?
A one molar solution.
by nicole-2B
Fri Nov 15, 2019 1:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structures & VSEPR
Replies: 9
Views: 63

Re: Lewis Structures & VSEPR

It is not totally necessary but can be helpful to determine the shape of the molecule.
by nicole-2B
Fri Nov 08, 2019 2:45 pm
Forum: Coordinate Covalent Bonds
Topic: Elements that can form coordinate covalent bonds
Replies: 2
Views: 47

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-2B
Fri Nov 08, 2019 2:44 pm
Forum: Sigma & Pi Bonds
Topic: Single vs. Double bonds
Replies: 15
Views: 150

Re: Single vs. Double bonds

There are more electrons being shared so there is a greater attraction causing for shorter bonds.
by nicole-2B
Fri Nov 08, 2019 2:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

kevinolvera1j wrote:nice joke,
Helium Helium Helium

This made me hehehe!! haha
by nicole-2B
Fri Nov 08, 2019 2:34 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 18
Views: 332

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-2B
Fri Nov 08, 2019 2:29 pm
Forum: Dipole Moments
Topic: Dipole moments on Lewis structures
Replies: 3
Views: 42

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-2B
Thu Oct 31, 2019 7:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

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-2B
Thu Oct 31, 2019 7:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Why does formal charge indicate stability?
Replies: 3
Views: 59

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-2B
Thu Oct 31, 2019 6:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Why did the attacking army use acid?
To neutralize the enemy's base!
by nicole-2B
Thu Oct 31, 2019 5:05 pm
Forum: Lewis Structures
Topic: Drawing lewis structures
Replies: 8
Views: 73

Re: Drawing lewis structures

since he has not gone over it I would not worry to much about it
by nicole-2B
Thu Oct 31, 2019 5:04 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Did you hear about oxygen’s date with potassium?
It went OK.
by nicole-2B
Thu Oct 31, 2019 5:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Did you hear about oxygen’s date with potassium?
It went OK.
by nicole-2B
Thu Oct 24, 2019 8:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: order of electron configuration
Replies: 4
Views: 56

Re: order of electron configuration

Image
This should help in writing electron configurations
by nicole-2B
Thu Oct 24, 2019 8:35 pm
Forum: Trends in The Periodic Table
Topic: Homework Question 1F.19
Replies: 5
Views: 56

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-2B
Thu Oct 24, 2019 8:29 pm
Forum: Lewis Structures
Topic: Where to start putting dots for electrons
Replies: 10
Views: 142

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-2B
Thu Oct 24, 2019 8:23 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 17
Views: 239

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-2B
Thu Oct 24, 2019 8:22 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

Re: Post All Chemistry Jokes Here

Why do chemists like nitrates so much?
They're cheaper than day rates.
by nicole-2B
Fri Oct 18, 2019 3:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions
Replies: 4
Views: 51

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-2B
Fri Oct 18, 2019 3:16 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

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-2B
Fri Oct 18, 2019 3:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1214838

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-2B
Fri Oct 18, 2019 3:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: G orbital
Replies: 6
Views: 61

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-2B
Fri Oct 18, 2019 3:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: electron configuration
Replies: 4
Views: 70

electron configuration

Why does 3d go before 4s in the electron configuration? I learned before it was 4s then 3d.
by nicole-2B
Fri Oct 11, 2019 11:14 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in Speed [ENDORSED]
Replies: 18
Views: 4374

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-2B
Fri Oct 11, 2019 11:03 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect vs Atomic Spectrum
Replies: 2
Views: 45

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-2B
Fri Oct 11, 2019 11:02 am
Forum: Einstein Equation
Topic: Planck's constant
Replies: 9
Views: 200

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-2B
Fri Oct 11, 2019 10:59 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 30
Views: 1320

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-2B
Fri Oct 11, 2019 10:57 am
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3187

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-2B
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: 3130

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-2B
Thu Oct 03, 2019 5:27 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons- Module Question
Replies: 3
Views: 373

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-2B
Thu Oct 03, 2019 5:26 pm
Forum: Properties of Light
Topic: Relationship Between Velocity and Wavelength
Replies: 6
Views: 142

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...

Go to advanced search