Search found 50 matches

by Angeline 3E
Wed Dec 04, 2019 12:33 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How does anion stability contribute to relative acidity?
Replies: 6
Views: 92

How does anion stability contribute to relative acidity?

I know the rule that a structure with a more stabilized anion makes that structure stronger but what does it have to do with making the acidity stronger? and why is it more willing to give up an H+? Thanks!
by Angeline 3E
Mon Dec 02, 2019 11:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge and its effect on Shape
Replies: 3
Views: 37

Formal Charge and its effect on Shape

What are the Formal Charges rules to make the most ideal stable shape/structure? Thanks!
by Angeline 3E
Mon Dec 02, 2019 7:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity and electronegativity
Replies: 2
Views: 40

Polarity and electronegativity

What's the correlation? How does the difference in electronegativity between two elements in a compound cause a molecule to be polar (even if its VESPR structure is symmetrical)?
by Angeline 3E
Mon Dec 02, 2019 4:49 pm
Forum: Bond Lengths & Energies
Topic: Boiling Point and bonds
Replies: 5
Views: 145

Boiling Point and bonds

How can we use boiling points to argue why one compound has a higher IMF than another without incorporating in bonds since BPs don't break bonds?
by Angeline 3E
Mon Dec 02, 2019 4:45 pm
Forum: Identifying Acidic & Basic Salts
Topic: Bronsted Acids vs Lewis Acids
Replies: 2
Views: 42

Bronsted Acids vs Lewis Acids

+ along with Bronsted bases and Lewis bases. What's the difference between the two? I don't think they're the same because in my discussion notes it says Bronsted acids/bases can be Lewis acids/bases but not always the same vice versa? Thanks!
by Angeline 3E
Sun Dec 01, 2019 12:47 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 3
Views: 66

Re: Naming Coordination Compounds

1. When naming a complex ion, the ligands are named before the metal ion. 2. Write the names of the ligands in the following order: neutral, negative, positive. If there are multiple ligands of the same charge type, they are named in alphabetical order. (Numerical prefixes do not affect the order.)...
by Angeline 3E
Sun Dec 01, 2019 12:36 pm
Forum: Hybridization
Topic: Hybridization & Sigma and Pi Bonds
Replies: 4
Views: 59

Hybridization & Sigma and Pi Bonds

Sorry how do pi bonds affect hybridization? Thanks!
by Angeline 3E
Sun Dec 01, 2019 12:22 pm
Forum: Hybridization
Topic: Helpful table from book- Connecting hybridization and molecular shape
Replies: 2
Views: 49

Re: Helpful table from book- Connecting hybridization and molecular shape

Hi this is a table I found in the book that I found to be very helpful in connecting hybridization and molecular shape together. It's from Topic 2F and I have been using it in conjunction with a table of the VSEPR geometries and bond angles. replying so I can save this in my replied post section th...
by Angeline 3E
Wed Nov 27, 2019 1:05 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Common Ligand charges
Replies: 1
Views: 43

Common Ligand charges

To memorize the ligand charges in a coordinate compound, is there a way to know the charge or do we memorize the table like the chart in the book (9C.1)? For ex, in [Fe(CN)6]-1 do we just have to know that cyano is a -1 charge? I dont remember him giving a list of ligands and their charge in class?
by Angeline 3E
Wed Nov 27, 2019 12:50 am
Forum: Student Social/Study Group
Topic: Peer Learning Sessions tomorrow?
Replies: 1
Views: 62

Peer Learning Sessions tomorrow?

I'm assuming there won't be any tomorrow at all since technically Thanksgiving break starts at 3pm? or will there be any sessions before 3pm?
by Angeline 3E
Sun Nov 24, 2019 11:57 pm
Forum: Hybridization
Topic: When does hybridization occur?
Replies: 7
Views: 69

Re: When does hybridization occur?

bump because I need an explanation on this too !!
by Angeline 3E
Sun Nov 24, 2019 11:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 2
Views: 53

Re: Test 2

For grades, dont we usually get tests back in the next discussion? I heard some TAs can put up the test grades on my.ucla in advance (but not all do it) so maybe check it out
by Angeline 3E
Sun Nov 24, 2019 11:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strong acids vs weak acids
Replies: 8
Views: 73

Re: Strong acids vs weak acids

Most acids are considered weak because few acids actually fully dissolve into ions. It would be easiest to just memorize the strong acids (for example HCl, HBr, and so on) to understand which ones WILL fully dissolve. If an acid isn't a part of that list, it's likely a weak acid. Thank you, does th...
by Angeline 3E
Sun Nov 24, 2019 11:31 pm
Forum: Naming
Topic: Week 9 and Week 10 HW?
Replies: 21
Views: 258

Re: Week 9 and Week 10 HW?

alex_4C wrote:Does that mean that our discussions are cancelled this week?


I dont think so he hasnt sent an email..It also makes sense if Lavelle's email only applies to people who have discussions after Wednesdays D:
by Angeline 3E
Sun Nov 24, 2019 11:29 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strong acids vs weak acids
Replies: 8
Views: 73

Re: Strong acids vs weak acis

Weak acids will have higher pH values than strong acids. A weak acid is an acid which partially dissociates into ions in an aqueous solution, while a strong acid will fully dissociate into ions. A common example of a weak acid is acetic acid. HCl is a common example of a strong acid. Is there a way...
by Angeline 3E
Sun Nov 24, 2019 11:27 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strong acids vs weak acids
Replies: 8
Views: 73

Strong acids vs weak acids

What is the difference and significance in reactions?
by Angeline 3E
Sun Nov 24, 2019 3:00 pm
Forum: Naming
Topic: Week 9 and Week 10 HW?
Replies: 21
Views: 258

Week 9 and Week 10 HW?

On the email, Lavelle we can turn in Week 9 and 10 HW on week 10? Does anybody know if we can do 10 problems then just to count 2 weeks of homework to save paper ?
by Angeline 3E
Sun Nov 24, 2019 2:52 pm
Forum: Hybridization
Topic: Why do we use Hybridization?
Replies: 2
Views: 53

Why do we use Hybridization?

Why do we have to utilize hybridization?
by Angeline 3E
Sun Nov 24, 2019 2:20 pm
Forum: Naming
Topic: Naming in alphabetical order?
Replies: 2
Views: 32

Naming in alphabetical order?

What does it exactly mean when you have to name the compound in alphabetical order? Thanks !!
by Angeline 3E
Sun Nov 24, 2019 1:59 pm
Forum: Naming
Topic: Chloro vs Chloride
Replies: 3
Views: 47

Chloro vs Chloride

Im confused when to drop the -ide to a -o !! Thanks !!

(somehow not in my notes)
by Angeline 3E
Thu Nov 21, 2019 10:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral and its polarity
Replies: 6
Views: 82

Re: Tetrahedral and its polarity

Victor James 4I wrote:if all the bonded atoms are the same ( ex. CCl4, CH4) then there is no dipole

does this also apply to trigonal bipyramidal and octahedral?
by Angeline 3E
Thu Nov 21, 2019 10:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral and its polarity
Replies: 6
Views: 82

Tetrahedral and its polarity

im confused because a tetrahedral has bonds in different planes (like theres one w the dotted line and the solid line) does this means any molecule with a tetrahedral structure is always polar because how will the dipoles cancel out? https://www.google.com/url?sa=i&source=images&cd=&ved=...
by Angeline 3E
Wed Nov 20, 2019 12:30 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Why is CBr2Cl2 polar?
Replies: 7
Views: 110

Re: Why is CBr2Cl2 polar?

While the Lewis dot structure may look like its dipoles cancel out when you draw the two bromine atoms and two chlorine atoms diagonally, the shape tetrahedral is polar since it is asymmetrical. https://www.google.com/imgres?imgurl=https%3A%2F%2Fchem.libretexts.org%2F%40api%2Fdeki%2Ffiles%2F1314%2F...
by Angeline 3E
Tue Nov 19, 2019 11:34 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: Why is CBr2Cl2 polar?
Replies: 7
Views: 110

Why is CBr2Cl2 polar?

Isnt CBr2Cl2 a tetrahedral and wouldnt the dipoles cancel out because if the Cl's are placed diagonally against each other the dipoles would cancel out same with the Br's? If they were placed diagonally, wouldnt the dipoles cancel out? In: https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.chemi...
by Angeline 3E
Sun Nov 17, 2019 10:54 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: can someone explain ion-dipole?
Replies: 3
Views: 38

can someone explain ion-dipole?

title + also induced dipole !! im having a hard time knowing when something has ion dipole or induced dipole forces
by Angeline 3E
Sun Nov 17, 2019 10:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is SF4 Polar?
Replies: 6
Views: 68

Why is SF4 Polar?

It has a seesaw shape but how does the shape affect its polarity? Thanks !
by Angeline 3E
Sun Nov 17, 2019 4:27 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: Is there a point where induced dipole induced dipole is stronger than ion ion?
Replies: 2
Views: 35

Is there a point where induced dipole induced dipole is stronger than ion ion?

title ^^ but how do we know if a really long structure like CH3CH2CH2CH3 with induced-dipole induced-dipole has stronger IMFs than a small molecule with ion-ion bonds like KCl? Is it even possible or are ion-ion bonds always stronger than induced-dipole induced-dipole forces ? (based off of the Test...
by Angeline 3E
Sun Nov 17, 2019 4:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Bond Angles?
Replies: 3
Views: 32

Determining Bond Angles?

For models with lone pairs attached to the central atom, how do we know what the bond angle is? Do we just have to memorize the bond angle trend in like ex: trigonal pyramidal?
by Angeline 3E
Sat Nov 16, 2019 3:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: test 2
Replies: 13
Views: 148

Re: test 2

Only if hybridization is also on the one page of notes he has left to teach us on Monday I thought I heard Lavelle state in lecture that there will not be any hybridization on Test 2. Did anyone else hear the same or did I hear it wrong? \ i believe he said sigma and pi bonds on monday but not hybr...
by Angeline 3E
Fri Nov 15, 2019 7:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to study for VSEPR?
Replies: 9
Views: 142

How to study for VSEPR?

How are you guys studying for VSEPR for Test 2? Just doing practice problems? Are there any good practice problems anybody can suggest :D Thanks
by Angeline 3E
Wed Nov 13, 2019 12:42 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F3 HW Help
Replies: 1
Views: 28

3F3 HW Help

Can someone elaborate on "For which of the following molecules will dipole-dipole interactions be important: (a) CH4; (b) CH3Cl; (c) CH2Cl2; (d) CHCl3; (e) CCl4? " . Need help understanding what it's asking for since london dispersion is present in all molecules ??
by Angeline 3E
Sun Nov 10, 2019 10:17 pm
Forum: Ionic & Covalent Bonds
Topic: Drawing hydrogen bonds between compounds?
Replies: 1
Views: 41

Drawing hydrogen bonds between compounds?

So if we want to connect two compounds to form a hydrogen bond (like O from one compound and H from another) we draw ||||||| between the two to connect them? What are the limitations for drawing hydrogen bonds besides H has to be attached to N, O, and F?
by Angeline 3E
Sun Nov 10, 2019 10:12 pm
Forum: Dipole Moments
Topic: Bonds in Pentane vs 2-2 dimethylbutane?
Replies: 2
Views: 34

Bonds in Pentane vs 2-2 dimethylbutane?

In lecture, why is pentane stronger than 2-2 dimethylbutane? I know it's because of the shape ... but 2-2 dimethylbutane looks like the atoms would be closer together based on the structure? Can I get a clarification ?
by Angeline 3E
Tue Nov 05, 2019 11:41 pm
Forum: Lewis Structures
Topic: Octet rule exceptions?
Replies: 4
Views: 84

Octet rule exceptions?

What are the exceptions to the octet rule?
by Angeline 3E
Tue Nov 05, 2019 11:21 pm
Forum: Lewis Structures
Topic: Lowest Energy on Formal Charge
Replies: 3
Views: 50

Re: Lowest Energy on Formal Charge

The lowest energy lewis structure is the one with the least formal charge (i.e. closest to zero). We move bonds around so that we can achieve this; it all depends on the # of valence electrons in the element and how many electrons (shared or lone pairs) surround the element in the structure. Creati...
by Angeline 3E
Tue Nov 05, 2019 11:10 pm
Forum: Lewis Structures
Topic: Lowest Energy on Formal Charge
Replies: 3
Views: 50

Lowest Energy on Formal Charge

How do you know which structure has the lowest energy charge? Why do we move the bonds in the structure around (like it's not efficient enough?)?
by Angeline 3E
Mon Nov 04, 2019 3:44 pm
Forum: Lewis Structures
Topic: Electron Configuration & Formal Charge for Cu
Replies: 4
Views: 61

Electron Configuration & Formal Charge for Cu

Earlier in class, why was Cu2+'s electron configuration [Ar](3d9) instead of [Ar](4s1)(3d8)? Why did Lavelle take an electron from one s orbital and one of the d orbital instead of taking 2 electrons from the d orbital?
by Angeline 3E
Sun Nov 03, 2019 11:37 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures on Test?
Replies: 4
Views: 68

Drawing Resonance Structures on Test?

So do we draw all the possible structures and put arrows to indicate? Is there anything else that needs to be added?
by Angeline 3E
Sun Nov 03, 2019 11:33 pm
Forum: Trends in The Periodic Table
Topic: 3rd IE?
Replies: 2
Views: 61

3rd IE?

If between K and Ca..
Ca has the stronger IE
and K has the stronger 2nd IE
would Ca have the stronger 3rd IE since it'll be at [Ar] while K would now have [Ne](3s^2)(3p^5)??
by Angeline 3E
Sun Nov 03, 2019 11:29 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge when it's not labelled?
Replies: 2
Views: 55

Formal Charge when it's not labelled?

Do we do formal charge even when there's no symbol indicated (like the + or - sign on the ion)?
by Angeline 3E
Sun Nov 03, 2019 11:27 pm
Forum: Photoelectric Effect
Topic: Best way to study for this topic?
Replies: 8
Views: 268

Best way to study for this topic?

How are you guys studying for this part of Quantum for the midterm since I find this topic a little bit harder to understand than the other topics!! Like any suggested homework problems?
by Angeline 3E
Thu Oct 24, 2019 2:50 pm
Forum: Trends in The Periodic Table
Topic: Which element is stronger in IE?
Replies: 2
Views: 31

Which element is stronger in IE?

In discussion, TA used Na and Mg to see which element had a higher IE. Just to clarify, Mg it's stronger before it loses electrons. But, once both gain their noble gas configurations (lose their electrons), Na is stronger in IE because it's not as willing to give up an electron?
by Angeline 3E
Thu Oct 24, 2019 2:44 pm
Forum: Properties of Light
Topic: memorize radiation and its frequencys?
Replies: 2
Views: 49

memorize radiation and its frequencys?

^^ , Do you think we expected to memorize like if different radiations part of the EMspectra and its frequencies for the midterm?
by Angeline 3E
Thu Oct 17, 2019 7:46 pm
Forum: DeBroglie Equation
Topic: the m in the de broglie equation
Replies: 5
Views: 65

the m in the de broglie equation

so when we use the de broglie equation is m always the mass of an atom??
by Angeline 3E
Thu Oct 17, 2019 7:42 pm
Forum: Quantum Numbers and The H-Atom
Topic: quantum number topic
Replies: 4
Views: 70

quantum number topic

i am a little confused with what the quantum numbers do !! so with n it can be any number and it determines energy inside but l is n-1 and m can be the same number as l??
by Angeline 3E
Thu Oct 03, 2019 11:32 pm
Forum: Limiting Reactant Calculations
Topic: Understanding equations
Replies: 5
Views: 74

Re: Understanding equations

^^ in addition since he asked if we should know..does that mean we have to know the polyatomic ion list ?
by Angeline 3E
Thu Oct 03, 2019 11:15 pm
Forum: Balancing Chemical Reactions
Topic: Question on L.33
Replies: 4
Views: 93

Re: Question on L.33

Wait can someone answer this too !! I'm trying to set up the equation would it be .....

BaBrx + Cl → BaCl2 + Br ?? like would Bromine be it's own product at the end !! (unbalanced but I'm not even sure if this equation is right)

Sorry if it's wrong :T
by Angeline 3E
Thu Oct 03, 2019 5:19 pm
Forum: Balancing Chemical Reactions
Topic: Question on L39
Replies: 1
Views: 67

Question on L39

Help I'm confused how to utilize the lab findings aka the grams founds from heating in the crucible to solve the word problem !!
by Angeline 3E
Thu Oct 03, 2019 5:14 pm
Forum: Molarity, Solutions, Dilutions
Topic: Clarification for G17b ?
Replies: 4
Views: 46

Clarification for G17b ?

for b) since the second part gives CuSo4 • 5H2O , do we just calculate the total molar mass for the whole thing including the H2O and multiply by the moles from the given M and V to get the grams?
by Angeline 3E
Wed Oct 02, 2019 2:36 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Solubility Rules Memorization ?
Replies: 3
Views: 93

Solubility Rules Memorization ?

When we solve problems are the little chemistry symbols at the bottom of each reactant/product (like (aq),(l), or (s)) already given? Or do we need to memorize the solubility rules in order to determine whether the reactant/product is aqueous or not? (Just for labelling)? i.e Will the word problems ...

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