Search found 79 matches

by CNourian2H
Wed Feb 19, 2020 9:55 pm
Forum: Administrative Questions and Class Announcements
Topic: about the Midterm...
Replies: 6
Views: 52

Re: about the Midterm...

I think my main issue was freaking out when I enter the test. Just remember to breathe and relax before starting each assessment so you can answer each question with a clear mind and right direction. Good luck everyone!
by CNourian2H
Wed Feb 19, 2020 9:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 142
Views: 3691

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

Thank you, this was so interesting and uplifting.
by CNourian2H
Wed Feb 19, 2020 9:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Lavelle's Office Hours
Replies: 4
Views: 46

Re: Lavelle's Office Hours

Does anyone know what Lavelle's office hours are like? Is it going over general HW problems and information, or do we need to ask him questions and bring our own HW problems in?
by CNourian2H
Wed Feb 19, 2020 9:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Material
Replies: 3
Views: 9

Test 2 Material

Since Test 2 has been postponed to a week later, does that mean we will also be responsible for all the info we learn next week?
by CNourian2H
Wed Feb 19, 2020 9:47 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q=n*delta H
Replies: 5
Views: 27

Re: q=n*delta H

Whether you use delta H or C*delta T depends on the information you are given. If you have delta H reaction, for example, then you will use that value. If you don’t have that information and instead just have the material and it’s specific heat, as well as the temperature change, you will use that ...
by CNourian2H
Wed Feb 19, 2020 9:45 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta s = 0
Replies: 8
Views: 29

Re: Delta s = 0

that is true for reversible isothermal expansion. for an irreversible rxn, delta s is greater than 0 and delta s surroundings is =0.
by CNourian2H
Wed Feb 19, 2020 9:38 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Second law of thermodynamics
Replies: 6
Views: 15

Re: Second law of thermodynamics

it is natural for entropy to increase abd be greater than 0 because the world naturally will always has disorder. Only in conditions that aren't related to the real world, that is when entropy is =0.
by CNourian2H
Wed Feb 19, 2020 9:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 14
Views: 201

Re: Anode and Cathode

how do the terms anode and cathode relate to oxidation and reduction. He used the latter pair of terms to define anode and cathode, but can someone explain this further?
by CNourian2H
Wed Feb 19, 2020 9:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7831
Views: 1088213

Re: Post All Chemistry Jokes Here

What did the bartender say when oxygen, hydrogen, sulfur, sodium, and phosphorus walking into the bar? OH SNaP!
by CNourian2H
Wed Feb 19, 2020 9:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7831
Views: 1088213

Re: Post All Chemistry Jokes Here

Here is a joke:
by CNourian2H
Wed Feb 19, 2020 9:19 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Delta G and delta Gr
Replies: 2
Views: 11

Re: Delta G and delta Gr

when do we know when to write delta G r (with r as the subscript)? I see both but never understand when to write what when calculating it.
by CNourian2H
Wed Feb 19, 2020 9:17 pm
Forum: Balancing Redox Reactions
Topic: Understanding Half-Reactions
Replies: 11
Views: 31

Re: Understanding Half-Reactions

Can you explain how to tell which is being oxidized and which is being reduced in a redox rxn?
by CNourian2H
Wed Feb 19, 2020 9:15 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 7
Views: 27

Re: Oxidation Numbers

Maya Pakulski 1D wrote:What are oxidation numbers used for?


I am also partly confused with this. I understand we use the oxidation numbers for redox reactions, but can you explain how it in an example?
by CNourian2H
Wed Feb 19, 2020 9:12 pm
Forum: Balancing Redox Reactions
Topic: What is being reduced/oxidized in this rxn?
Replies: 4
Views: 27

Re: What is being reduced/oxidized in this rxn?

I think there is an error also. Yours looks correct.
by CNourian2H
Wed Feb 19, 2020 9:09 pm
Forum: Balancing Redox Reactions
Topic: Redox reactions
Replies: 2
Views: 11

Re: Redox reactions

You put the H+ for the acidic solution on the opposite side of the H20 (when applicable to add it).
by CNourian2H
Tue Feb 11, 2020 8:59 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: thermodynamically stable
Replies: 6
Views: 23

Re: thermodynamically stable

i never saw this in our notes. will we be tested on this?
by CNourian2H
Tue Feb 11, 2020 8:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: thermodynamically stable
Replies: 6
Views: 23

thermodynamically stable

what does it mean to b thermodynamically stable? how does this relate to gibbs free energy?
by CNourian2H
Mon Feb 10, 2020 8:58 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: higher molar entropies
Replies: 2
Views: 20

higher molar entropies

why does a monoatomic gas have higher entropy than a diatomic gas?
by CNourian2H
Mon Feb 10, 2020 4:01 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermal
Replies: 9
Views: 32

Re: Isothermal

Not necessarily. Isothermal means that there is no temperature change (aka deltaT = 0) whereas reversibility has to do with entropy and if total entropy is 0 (aka in a reversible system) or if entropy of the surroundings is 0 (aka in an irreversible system). Can you explain further how entropy rela...
by CNourian2H
Mon Feb 10, 2020 3:54 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs irreversible expansions
Replies: 2
Views: 23

Reversible vs irreversible expansions

What is the difference between reversible and irreversible expansions?
by CNourian2H
Sun Feb 09, 2020 10:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: heat cap for liquid water instead of solid water
Replies: 1
Views: 10

heat cap for liquid water instead of solid water

Why do you use the specific heat capacity for liquid water instead of solid water in this problem?
4C.11 How much heat is needed to convert 80.0 g of ice at 0.0 8C into liquid water at 20.0 8C (see Tables 4A.2 and 4C.1)?
by CNourian2H
Sun Feb 09, 2020 8:42 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW 4c.3
Replies: 2
Views: 21

HW 4c.3

4C.3 Calculate the final temperature and the change in enthalpy when 765 J of energy is transferred as heat to 0.820 mol Kr(g) at 298 K and 1.00 atm (a) at constant pressure; (b) at constant vol- ume. Treat the gas as ideal.

How do you differentiate what to do for constant pressure vs constant vol?
by CNourian2H
Sun Feb 09, 2020 1:01 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW Question
Replies: 2
Views: 16

Re: HW Question

Also, isn't it usually qsys = -qsurr
so how is this different from the problems using that equation.
by CNourian2H
Sun Feb 09, 2020 1:00 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW Question
Replies: 2
Views: 16

HW Question

Hi. Im confused why we would add the heat of kettle and heat of water together for this problem in (a). 4A.7 (a) Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its tem- perature from 20.0 8C to the boiling point of water, 100.0 8C. (b...
by CNourian2H
Thu Jan 23, 2020 2:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases pka and pkb
Replies: 8
Views: 33

Re: Acids and Bases pka and pkb

Mariah wrote:
Abhi Vempati 2H wrote:Adding on to what @Hui Qiao Wu 1I mentioned, the lower the pka of an acid, the higher the pKb of its conjugate base. This is because of the equation pka + pKb = 14. Hope this helps!


14 is the same as p[sub]w right?


Yes, Pkw=14
by CNourian2H
Wed Jan 22, 2020 3:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases pka and pkb
Replies: 8
Views: 33

Acids and Bases pka and pkb

Can someone explain the relation btwn pkA/pkB and how strong the acid/base is. If I have a higher pkB, does that mean I have a weaker base?
by CNourian2H
Wed Jan 22, 2020 1:36 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.13
Replies: 3
Views: 31

5J.13

5J.13 A gaseous mixture consisting of 2.23 mmol N2 and 6.69 mmol H2 in a 500.-mL container was heated to 600. K and allowed to reach equilibrium. Will more ammonia be formed if that equilibrium mixture is then heated to 700. K? For N2(g) + 3H2(g) --> 2NH3(g), K=1.7 x 10^-3 at 600.K and K=7.8 x 10^-5...
by CNourian2H
Tue Jan 21, 2020 6:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: partial pressure
Replies: 5
Views: 21

partial pressure

what are the general units for partial pressure? I have seen bar and atm, so do both work depending on what the problem gives you?
by CNourian2H
Tue Jan 21, 2020 5:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G part c
Replies: 3
Views: 17

5G part c

5G.1 State whether the following statements are true or false. If false, explain why.
(c) If one starts with a higher pressure of reactant, the equilibrium constant will be larger.

Can someone explain C to me? I understand it is false but i want to know the best way to explain it.
by CNourian2H
Wed Jan 15, 2020 6:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: HW 5J.5 part C
Replies: 3
Views: 17

HW 5J.5 part C

5J.5 State whether reactants or products will be favored by an increase in the total pressure (resulting from compression) on each of the following equilibria. If there is no change, explain why that is so. 
(c) 4NH3(g)+ 5O2(g) -> HNO(g) + 6H2O(g) How do I know the reactants are favored in this case...
by CNourian2H
Sun Dec 08, 2019 3:40 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 57

Re: Acid Strength- Acetic vs Formic Acid

So it is involving electronegativity...Im guessing.
by CNourian2H
Sun Dec 08, 2019 3:39 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 57

Re: Acid Strength- Acetic vs Formic Acid

Oh I think I got it. It's because of the CH3 in acetic acid is electron donating, and it contributes e- density towards the O-H bond making the bond stronger to break and H+ ion less wanting to go and attach to another compound.
by CNourian2H
Sun Dec 08, 2019 3:36 am
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Rod vs spherical shaped molecules
Replies: 8
Views: 59

Re: Rod vs spherical shaped molecules

I get it now. The rod shaped molecs have greater surface area bc of more pts of interaction btwn 2 polar molecs, which causes a stronger interaction btwn the 2 molecs. therefore, a higher BP would be needed to break up the 2 molecs.
by CNourian2H
Sat Dec 07, 2019 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 4121

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

Naren_Ramesh_4D wrote:On question 2b of the mini marshmallow, does the order of the ligand in the coordination complex matter?


I dont think so

order of ligands matters in writing the name- alphabetical order
not in writing formula
by CNourian2H
Sat Dec 07, 2019 1:40 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: HW 6D.11 part e
Replies: 1
Views: 42

HW 6D.11 part e

6D.11 Decide whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. If pH . 7 or pH , 7, write a chemical equation to justify your answer. (e) AlCl3;

I am confused how to write the equation for Al +3. Why does it combine with H20 first?
by CNourian2H
Fri Dec 06, 2019 6:04 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 57

Acid Strength- Acetic vs Formic Acid

Problem 6C.21b: Why is formic acid stronger than acetic acid? I'm confused with the electronegativity/polarity aspect of it.
by CNourian2H
Fri Dec 06, 2019 5:13 pm
Forum: Lewis Acids & Bases
Topic: List of Strong Acids/Bases
Replies: 1
Views: 18

Re: List of Strong Acids/Bases

Also, if anyone knows the full list of strong and weak acids and bases we need to memorize.
by CNourian2H
Fri Dec 06, 2019 5:12 pm
Forum: Lewis Acids & Bases
Topic: List of Strong Acids/Bases
Replies: 1
Views: 18

List of Strong Acids/Bases

Does anyone have a good list that simply puts what to look for when trying to decide whether one acid/base is stronger than another?
by CNourian2H
Thu Dec 05, 2019 10:31 pm
Forum: Amphoteric Compounds
Topic: Transition Metals
Replies: 1
Views: 33

Transition Metals

How do i know if a transition metal is amphoteric? Do we need to know specific ones for the final?
by CNourian2H
Wed Dec 04, 2019 9:50 pm
Forum: Naming
Topic: HW Problem 9C 3d
Replies: 1
Views: 26

HW Problem 9C 3d

We are asked to write the formula for sodiumbisoxalato(diaqua)ferrate(III)

I'm confused how we know which ligand to put first and which to put second in the formula for the compound.
Also, why is diaqua in parentheses?
by CNourian2H
Wed Dec 04, 2019 9:22 pm
Forum: Naming
Topic: Homework Problem 9C 3a
Replies: 2
Views: 32

Homework Problem 9C 3a

So the problem asks to write the formula for potassium hexacyanidochromate(III) I understand how to get the formula from this coordination compound name but I want to clarify a few things. 1)the -3 charge for hexacyanidochromate is not written outside the brackets bc it cancels out with the +3 charg...
by CNourian2H
Wed Dec 04, 2019 3:39 pm
Forum: Hybridization
Topic: Hybridization General Question
Replies: 3
Views: 35

Hybridization General Question

In Homework question 2.45, it asks to write the hybridization of each lone pair in the bonding in H2C =(double bond) CHCHO. The drawing in the answer key says the lone pairs of O have a hybridization of sp2 but the hybridization of O when its bonded is 2sp2 (difference is the 2 in front). What does ...
by CNourian2H
Wed Dec 04, 2019 2:25 pm
Forum: Hybridization
Topic: Drawing Acrylonitrile
Replies: 1
Views: 19

Drawing Acrylonitrile

Problem 2F.13 asks to draw Acrylonitrile, which is CH2CHCN, and then state the bond angles. How do I know which element is the central atom and how to organize the surrounding molecules? The drawing affects what bond angles I put, so is there a way to ensure I draw it correctly with all compounds si...
by CNourian2H
Thu Nov 21, 2019 5:02 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: Hydrogen Bonding Homework Problem
Replies: 2
Views: 26

Hydrogen Bonding Homework Problem

3F.5 Suggest, giving reasons, which substance in each of the fol- lowing pairs is likely to have the higher normal melting point (Lewis structures may help your arguments): (a) HCl or NaCl; (b) C2H5OC2H5 (diethyl ether) or C4H9OH (butanol); (c) CHI3 or CHF3; (d) C2H4 or CH3OH. In B, why can buthanol...
by CNourian2H
Wed Nov 13, 2019 9:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 22
Views: 252

Re: Test #2

Do you think it will also have some information from the midterm as well? Or only new untested topics?
by CNourian2H
Tue Nov 12, 2019 1:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 22
Views: 252

Re: Test #2

Maybe we should ask Dr. Lavelle on Wednesday during the lecture, the test is coming up and I want to start preparing for it.
by CNourian2H
Tue Nov 12, 2019 1:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 7 Homework
Replies: 7
Views: 60

Re: Week 7 Homework

I feel like the homework is pretty flexible in which concepts you can do it on that are relatively recent- I'm thinking concepts like dipole moments, intermolecular and intramolecular forces, and whatever is around that is all ok.
by CNourian2H
Tue Nov 12, 2019 1:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Grades
Replies: 3
Views: 47

Re: Midterm Grades

Hiba Alnajjar_4B wrote:Not sure when they'll be posted, but Dr. Lavelle announced that we would be getting them back during Wednesday lecture, so maybe after Wednesday?


Are we reviewing the questions on the midterm during the lecture or just getting them back?
by CNourian2H
Tue Nov 12, 2019 1:35 pm
Forum: Dipole Moments
Topic: Temporary Dipoles
Replies: 5
Views: 37

Temporary Dipoles

Can someone explain what a temporary dipole is and how it occurs? How does it happen on a nonpolar molecule?
by CNourian2H
Tue Nov 12, 2019 1:32 pm
Forum: DeBroglie Equation
Topic: When to Use
Replies: 8
Views: 53

When to Use

I know the De Brogile Equation is used in certain circumstances, what are those? How do you know based on the wording of the question that you need to use this equation for your answer?
by CNourian2H
Tue Nov 12, 2019 1:30 pm
Forum: Lewis Structures
Topic: Exceptions
Replies: 5
Views: 31

Exceptions

What elements have exceptions to the octet rule other than the ones that are past the 3rd period and can have more than an octet? I know there are specific elements that also like specific types of bonds, what are those elements?
by CNourian2H
Tue Nov 12, 2019 1:27 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Rod vs spherical shaped molecules
Replies: 8
Views: 59

Rod vs spherical shaped molecules

Can someone explain the key differences between rod shaped and spherical shaped molecules?
by CNourian2H
Tue Nov 12, 2019 1:07 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 30
Views: 865

Re: Wavelength Plausibility

Technically, if the question asks if the wavelength is detectable, or more often it will ask if there are "detectable wavelike properties" that means that it wants to know whether the wavelength is greater than 10e-15 or not. That makes a lot of sense! A good thing to look out for, thanks!
by CNourian2H
Tue Nov 12, 2019 1:05 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 53
Views: 2491

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

All these worksheets were really helpful for reviewing for the midterm, thank you! Will any worksheets be posted to review for the upcoming Test 2? Thanks!
by CNourian2H
Tue Nov 12, 2019 1:02 pm
Forum: Student Social/Study Group
Topic: Chemistry News
Replies: 64
Views: 38107

Re: Chemistry News

Wow! I just read some of these articles and they're so interesting! Thank you for sharing, keep them coming!
by CNourian2H
Tue Nov 12, 2019 1:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit?
Replies: 6
Views: 80

Topics on Test 2

Hey guys! Does anyone know the full range of topics covered on Test 2? I know it is coming up next week starting the 19th but I am unsure what exactly is on it.
by CNourian2H
Tue Nov 12, 2019 12:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit?
Replies: 6
Views: 80

Extra Credit?

I'm pretty sure Dr. Lavelle doesn't offer any extra credit or other opportunities to boost up your grade, but I just wanted to make sure on Chem Community. Thanks!
by CNourian2H
Tue Nov 12, 2019 12:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Review Sessions?
Replies: 6
Views: 59

Test 2 Review Sessions?

Are there any review sessions and workshops available for the upcoming Test 2? Really nervous and wanted to get extra practice.
by CNourian2H
Tue Nov 12, 2019 12:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Grades
Replies: 3
Views: 47

Midterm Grades

Does anyone know when our midterm grades will be posted onto myucla?
by CNourian2H
Tue Nov 12, 2019 12:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: Finding orbitals without given ml quantum number
Replies: 2
Views: 33

Finding orbitals without given ml quantum number

1D.23 How many orbitals can have the following quantum numbers in an atom: (a) n=2, l=1; (c) n=2?

I am confused with how to answer a and c because they don't give a mI value so there are multiple orbitals that can have those quantum numbers.
by CNourian2H
Tue Nov 12, 2019 12:43 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing full electron configuration
Replies: 3
Views: 42

Writing full electron configuration

If it says to write the full electron configuration in the ground state for an element, do you ever need to include the different subshells that show unpaired electrons? for example: for the full electron configuration of nitrogen, in the 2p-orbital do you write it out as [2px1 2py1 2pz1] or just [2...
by CNourian2H
Tue Nov 12, 2019 12:38 pm
Forum: Empirical & Molecular Formulas
Topic: Answering a Question without amount of elements
Replies: 1
Views: 39

Answering a Question without amount of elements

When you don't get the amount in grams of each element in the question, what is the best way to find out those amounts? You would get the molar mass of the compound and the amounts of the other molecules in the equation. There was a question like this on the midterm.
by CNourian2H
Tue Nov 12, 2019 12:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Studying
Replies: 14
Views: 105

Final Studying

Has anyone began reviewing for the final? If so, what are you doing to slowly prepare?
by CNourian2H
Sun Oct 20, 2019 9:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quick Question about orbitals
Replies: 1
Views: 40

Quick Question about orbitals

Quick question! Why does the # of orbitals increase by 2 per level? For example, why does S have 1 orbital and the next level, p, has 3 orbitals, d has 5 orbitals, etc? It increases by 2, why can't it increase by 1?
by CNourian2H
Sun Oct 20, 2019 9:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Spin up and Spin down
Replies: 2
Views: 18

Spin up and Spin down

I am really confused with the spin up and spin down aspect we discussed in class. Can someone clear it up for me?
I also remember him saying that when both electrons are spin up, they interact differently than when they are spin down. Why?
by CNourian2H
Sun Oct 20, 2019 9:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Neon- electron configuration
Replies: 3
Views: 14

Neon- electron configuration

In class, Dr. Lavelle said that elements like Neon are not good at building bonds. Why is this so?
by CNourian2H
Sun Oct 20, 2019 8:56 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Series
Replies: 3
Views: 33

Re: Series

The series is from the spectrum of hydrogen, as sequences of lines correspond to atomic transitions that each begin or end with the same atomic state in hydrogen. The Balmer series- all of the lines are in the visible region The Lyman series- ultraviolet region The Brackett series, Pfund series, Pas...
by CNourian2H
Sun Oct 20, 2019 8:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Friday's lecture (4s and 3d)
Replies: 3
Views: 36

Re: Friday's lecture (4s and 3d)

The 4s sublevel is filled before the 3d sublevel because the 4s subshell is lower in energy, and it is farther from the nucleus than the 3d subshell.
by CNourian2H
Sun Oct 13, 2019 7:23 pm
Forum: Photoelectric Effect
Topic: Electrons ejected based on wavelength
Replies: 3
Views: 35

Electrons ejected based on wavelength

I am confused why light sources with long wavelengths of light cannot eject electrons in the photoelectric experiment, but why light sources with short wavelengths can. Can someone clear this up for me?
by CNourian2H
Sun Oct 13, 2019 7:19 pm
Forum: Properties of Electrons
Topic: Wavelike vs Particle-like Behavior
Replies: 6
Views: 56

Re: Wavelike vs Particle-like Behavior

I thought of this to mean that electrons behave both like particles and like waves. De Brogile explains that all material particles in motion have wave characteristics, but for microscopic bodies like electrons this observation is important. Electrons are under high speed, showing a wave-like appear...
by CNourian2H
Sun Oct 13, 2019 6:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Textbook Problem- 1B.19
Replies: 1
Views: 17

Textbook Problem- 1B.19

Hi guys, I'm confused with this textbook problem. Can anyone describe the steps needed to complete the problem? 1B.19 Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 x 10^5 mxs^-1 in a particle acce...
by CNourian2H
Sun Oct 13, 2019 6:51 pm
Forum: Properties of Light
Topic: Quanta
Replies: 4
Views: 46

Re: Quanta

We use quantum mechanics to describe the behavior of very small objects that can accept energy only in discrete amounts. These discrete amounts are called quanta. It's easy for me to think about quanta as the smallest unit of any physical property- whether that is energy, matter, etc. It is like a p...
by CNourian2H
Sun Oct 13, 2019 6:39 pm
Forum: Properties of Light
Topic: Quanta- clear up comparison
Replies: 3
Views: 33

Quanta- clear up comparison

During his lecture, Dr. Lavelle used an example of water flowing and its zoomed up version, water molecules, to describe the concept of quanta. I am very confused with this example. Can anyone explain it to me please? How does this relate to quanta?
by CNourian2H
Thu Oct 03, 2019 1:20 pm
Forum: Balancing Chemical Reactions
Topic: "Combustion" Term
Replies: 8
Views: 112

"Combustion" Term

I remember in class Dr. Lavelle said the term "combustion" can be referred to as a few different names. Can anyone tell me what else "combustion" can be called?
Do those different names imply a different meaning?
by CNourian2H
Thu Oct 03, 2019 1:15 pm
Forum: Limiting Reactant Calculations
Topic: Basic Question
Replies: 11
Views: 112

Basic Question

Is there only one limiting reactant in a reaction? Can there be 2 limiting reactants?

Or, what happens if there is the same amount of 2 reactants? What would that be called?
by CNourian2H
Thu Oct 03, 2019 1:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molar Mass Clarification
Replies: 3
Views: 31

Molar Mass Clarification

Can someone help me understand how molar mass differentiates for an element, molecular compound, and ionic compound? I know the basic definition of molar mass but know it can be specifically adjusted to each type of particle.
by CNourian2H
Thu Oct 03, 2019 12:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamental E
Replies: 2
Views: 57

Re: Fundamental E

The logic behind the anticipation is a good way to ensure you are moving in the right direction while answering the problem. If you can understand from the beginning that less than 1 mol F2 is present, then when you are actually doing the steps to answer the problem in its entirety, you know around ...
by CNourian2H
Thu Oct 03, 2019 12:48 pm
Forum: Balancing Chemical Reactions
Topic: Net # of moles produced
Replies: 4
Views: 226

Re: Net # of moles produced

Remember, net means overall. In this case, the net number of moles produced refers to the overall change of number of moles in the reactants to the products of the equation. You can use the simple equation net change = moles of products - moles of reactants.

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