Search found 49 matches

by CandiceNourian1J
Sun Dec 08, 2019 3:40 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 35

Re: Acid Strength- Acetic vs Formic Acid

So it is involving electronegativity...Im guessing.
by CandiceNourian1J
Sun Dec 08, 2019 3:39 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 35

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 CandiceNourian1J
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: 36

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 CandiceNourian1J
Sat Dec 07, 2019 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 3762

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 CandiceNourian1J
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: 27

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 CandiceNourian1J
Fri Dec 06, 2019 6:04 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 35

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 CandiceNourian1J
Fri Dec 06, 2019 5:13 pm
Forum: Lewis Acids & Bases
Topic: List of Strong Acids/Bases
Replies: 1
Views: 10

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 CandiceNourian1J
Fri Dec 06, 2019 5:12 pm
Forum: Lewis Acids & Bases
Topic: List of Strong Acids/Bases
Replies: 1
Views: 10

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 CandiceNourian1J
Thu Dec 05, 2019 10:31 pm
Forum: Amphoteric Compounds
Topic: Transition Metals
Replies: 1
Views: 15

Transition Metals

How do i know if a transition metal is amphoteric? Do we need to know specific ones for the final?
by CandiceNourian1J
Wed Dec 04, 2019 9:50 pm
Forum: Naming
Topic: HW Problem 9C 3d
Replies: 1
Views: 21

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 CandiceNourian1J
Wed Dec 04, 2019 9:22 pm
Forum: Naming
Topic: Homework Problem 9C 3a
Replies: 2
Views: 22

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 CandiceNourian1J
Wed Dec 04, 2019 3:39 pm
Forum: Hybridization
Topic: Hybridization General Question
Replies: 3
Views: 30

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 CandiceNourian1J
Wed Dec 04, 2019 2:25 pm
Forum: Hybridization
Topic: Drawing Acrylonitrile
Replies: 1
Views: 14

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 CandiceNourian1J
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: 19

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 CandiceNourian1J
Wed Nov 13, 2019 9:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 22
Views: 222

Re: Test #2

Do you think it will also have some information from the midterm as well? Or only new untested topics?
by CandiceNourian1J
Tue Nov 12, 2019 1:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 22
Views: 222

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 CandiceNourian1J
Tue Nov 12, 2019 1:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 7 Homework
Replies: 7
Views: 54

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 CandiceNourian1J
Tue Nov 12, 2019 1:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Grades
Replies: 3
Views: 42

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 CandiceNourian1J
Tue Nov 12, 2019 1:35 pm
Forum: Dipole Moments
Topic: Temporary Dipoles
Replies: 5
Views: 30

Temporary Dipoles

Can someone explain what a temporary dipole is and how it occurs? How does it happen on a nonpolar molecule?
by CandiceNourian1J
Tue Nov 12, 2019 1:32 pm
Forum: DeBroglie Equation
Topic: When to Use
Replies: 8
Views: 31

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 CandiceNourian1J
Tue Nov 12, 2019 1:30 pm
Forum: Lewis Structures
Topic: Exceptions
Replies: 5
Views: 28

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 CandiceNourian1J
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: 36

Rod vs spherical shaped molecules

Can someone explain the key differences between rod shaped and spherical shaped molecules?
by CandiceNourian1J
Tue Nov 12, 2019 1:07 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 30
Views: 731

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 CandiceNourian1J
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: 2154

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 CandiceNourian1J
Tue Nov 12, 2019 1:02 pm
Forum: Student Social/Study Group
Topic: Chemistry News
Replies: 64
Views: 37347

Re: Chemistry News

Wow! I just read some of these articles and they're so interesting! Thank you for sharing, keep them coming!
by CandiceNourian1J
Tue Nov 12, 2019 1:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit?
Replies: 6
Views: 75

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 CandiceNourian1J
Tue Nov 12, 2019 12:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit?
Replies: 6
Views: 75

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 CandiceNourian1J
Tue Nov 12, 2019 12:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Review Sessions?
Replies: 6
Views: 51

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 CandiceNourian1J
Tue Nov 12, 2019 12:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Grades
Replies: 3
Views: 42

Midterm Grades

Does anyone know when our midterm grades will be posted onto myucla?
by CandiceNourian1J
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: 19

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 CandiceNourian1J
Tue Nov 12, 2019 12:43 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing full electron configuration
Replies: 3
Views: 30

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 CandiceNourian1J
Tue Nov 12, 2019 12:38 pm
Forum: Empirical & Molecular Formulas
Topic: Answering a Question without amount of elements
Replies: 1
Views: 23

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 CandiceNourian1J
Tue Nov 12, 2019 12:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Studying
Replies: 14
Views: 90

Final Studying

Has anyone began reviewing for the final? If so, what are you doing to slowly prepare?
by CandiceNourian1J
Sun Oct 20, 2019 9:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quick Question about orbitals
Replies: 1
Views: 34

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 CandiceNourian1J
Sun Oct 20, 2019 9:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Spin up and Spin down
Replies: 2
Views: 14

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 CandiceNourian1J
Sun Oct 20, 2019 9:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Neon- electron configuration
Replies: 3
Views: 13

Neon- electron configuration

In class, Dr. Lavelle said that elements like Neon are not good at building bonds. Why is this so?
by CandiceNourian1J
Sun Oct 20, 2019 8:56 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Series
Replies: 3
Views: 27

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 CandiceNourian1J
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: 25

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 CandiceNourian1J
Sun Oct 13, 2019 7:23 pm
Forum: Photoelectric Effect
Topic: Electrons ejected based on wavelength
Replies: 3
Views: 28

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 CandiceNourian1J
Sun Oct 13, 2019 7:19 pm
Forum: Properties of Electrons
Topic: Wavelike vs Particle-like Behavior
Replies: 6
Views: 52

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 CandiceNourian1J
Sun Oct 13, 2019 6:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Textbook Problem- 1B.19
Replies: 1
Views: 11

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 CandiceNourian1J
Sun Oct 13, 2019 6:51 pm
Forum: Properties of Light
Topic: Quanta
Replies: 4
Views: 34

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 CandiceNourian1J
Sun Oct 13, 2019 6:39 pm
Forum: Properties of Light
Topic: Quanta- clear up comparison
Replies: 3
Views: 29

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 CandiceNourian1J
Thu Oct 03, 2019 1:20 pm
Forum: Balancing Chemical Reactions
Topic: "Combustion" Term
Replies: 8
Views: 77

"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 CandiceNourian1J
Thu Oct 03, 2019 1:15 pm
Forum: Limiting Reactant Calculations
Topic: Basic Question
Replies: 11
Views: 95

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 CandiceNourian1J
Thu Oct 03, 2019 1:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molar Mass Clarification
Replies: 3
Views: 27

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 CandiceNourian1J
Thu Oct 03, 2019 12:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamental E
Replies: 2
Views: 51

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 CandiceNourian1J
Thu Oct 03, 2019 12:48 pm
Forum: Balancing Chemical Reactions
Topic: Net # of moles produced
Replies: 4
Views: 217

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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