Search found 54 matches

by 905416023
Mon Dec 02, 2019 11:50 pm
Forum: Biological Examples
Topic: Heme Complex
Replies: 2
Views: 92

Re: Heme Complex

He'll answer it at the review :) don't stress Lyndon is an excellent teacher!
by 905416023
Mon Dec 02, 2019 11:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelate
Replies: 5
Views: 67

Re: chelate

This is how I remember it, if the molecule looks like there is a ring on it, it is a chelate. What I mean by ring, is a string of atoms starting at the central atom, connecting to one another in a string type formation, and reconnecting to the central atom.
by 905416023
Mon Dec 02, 2019 11:47 pm
Forum: Naming
Topic: Table 9C.1
Replies: 6
Views: 94

Re: Table 9C.1

Yes, during one of the workshops I was told we will need to memorize that whole table for the final.
by 905416023
Mon Dec 02, 2019 11:46 pm
Forum: Quantum Numbers and The H-Atom
Topic: Rydberg equation
Replies: 9
Views: 227

Re: Rydberg equation

I think we're not allowed to because it doesn't fully show out the concept. This class is very conceptual, therefore the whole concept of each problem is expected to be shown in our work.
by 905416023
Mon Dec 02, 2019 11:44 pm
Forum: Biological Examples
Topic: cisplatin
Replies: 5
Views: 121

Re: cisplatin

The cisplatin example in class discussed the difference between cis-diamine-dichloro-platinum(II) and trans-diamine-dichloro-platinum(II). The cisplatin has two cl's on the left of the central atom (Pt) and two NH3's on the right of the central atom. The Transplatin (not exactly sure if that is how ...
by 905416023
Mon Dec 02, 2019 11:38 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Strong Acids
Replies: 4
Views: 46

Re: Strong Acids

A Ka value is calculated by products being divided by reactants (products/reactants). Strong acids completely ionize in water, so there are no reactants left. This means the equation will be products/0. Any thing/0 is undefined. Therefore, strong acids can not have a Ka value.
by 905416023
Mon Dec 02, 2019 11:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge and its effect on Shape
Replies: 3
Views: 37

Re: Formal Charge and its effect on Shape

Generally, your objective is to make the structure have a formal charge of 0. But sometimes the overall structure will have a charge of -1, 1, or really any number. Sometimes it will be clear where the charge should be placed, but other times it can by places on multiple different atoms. This is whe...
by 905416023
Tue Nov 26, 2019 2:52 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation Number vs. Coordination Number
Replies: 8
Views: 143

Re: Oxidation Number vs. Coordination Number

I am also extremely confused on this. Is this something we are going to have to know for the final?
by 905416023
Tue Nov 26, 2019 2:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 9C.3
Replies: 4
Views: 82

Re: 9C.3

Claire Lo 3C wrote:Since there is a space between potassium and hexacyanidochromate (III), it indicates that potassium is out of the bracket.

K3 [Cr(CN)6]



I believe the potassium is out of the bracket not because of the space, but because it is a metal.
by 905416023
Tue Nov 26, 2019 2:47 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids and Bases
Replies: 6
Views: 55

Re: Bronsted Acids and Bases

I believe just naming them for now. More comes along in chem 14b I believe Lavelle said
by 905416023
Tue Nov 26, 2019 2:46 pm
Forum: Hybridization
Topic: sigma and pi bonds
Replies: 3
Views: 47

Re: sigma and pi bonds

Hybridization depends on the # of regions of electron density. 2 regions of electron density = sp hybridization. 3 regions of electron density = sp2 hybridization. 4 regions of electron density = sp3 hybridization. 5 regions of electron density = sp3d hybridization. 6 regions of electron density = s...
by 905416023
Tue Nov 26, 2019 2:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 9C.9
Replies: 2
Views: 39

Re: 9C.9

For part c the coordination number is 6 (en is bidentate) and d is also 6 (EDTA is hexadentate)
by 905416023
Tue Nov 19, 2019 1:33 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.1
Replies: 4
Views: 44

Re: 2E.1

Thank you guys! I truly appreciate it
by 905416023
Tue Nov 19, 2019 1:31 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi and Sigma bonds
Replies: 5
Views: 89

Re: Pi and Sigma bonds

It depends on how many bonds there are. 1 bond=1isgma bond. 2bonds=1 sigma and 1 pie. 3bonds=1 sigma and 2 pie
by 905416023
Tue Nov 19, 2019 1:22 am
Forum: Dipole Moments
Topic: 2E30
Replies: 1
Views: 68

Re: 2E30

I believe it is 3, but maybe they are equal? I'm not entirely sure and am also wondering.
by 905416023
Tue Nov 19, 2019 1:09 am
Forum: Sigma & Pi Bonds
Topic: Stability of Sigma and Pi Bonds
Replies: 4
Views: 76

Re: Stability of Sigma and Pi Bonds

I think it may have to do with the fact that in sigma bonds atoms can rotate. But I'm not 100% sure and am a little confused on this too.
by 905416023
Tue Nov 19, 2019 1:07 am
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 4
Views: 77

Re: Sigma and Pi Bonds

Yes, this will always hold true for what we are using them for in the p-block
by 905416023
Tue Nov 19, 2019 1:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.1
Replies: 4
Views: 44

2E.1

On the answer key it states B) may have lone pairs. How can this be if the structure is linear and not bent?
by 905416023
Mon Nov 11, 2019 6:28 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: melting points
Replies: 6
Views: 56

Re: melting points

So hydrogen bonds make the molecule harder to break apart? So then they have a higher boiling point?
by 905416023
Mon Nov 11, 2019 6:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum numbers
Replies: 13
Views: 307

Re: Magnetic Quantum numbers

ml= -l to +l. so if l is 2 then ml= -2,-1,0,1,2.
by 905416023
Mon Nov 11, 2019 6:13 pm
Forum: Dipole Moments
Topic: Dipole-Dipole Forces
Replies: 2
Views: 47

Re: Dipole-Dipole Forces

I also have the same question. This is confusing.
by 905416023
Mon Nov 11, 2019 6:12 pm
Forum: Student Social/Study Group
Topic: Chem 14B
Replies: 10
Views: 224

Re: Chem 14B

You can only take it if you took a math course this quarter :(
by 905416023
Mon Nov 04, 2019 10:08 pm
Forum: Ionic & Covalent Bonds
Topic: Question 2D.5
Replies: 2
Views: 47

Re: Question 2D.5

I think you're just supposed to know by the trend. Like electronegativity increases to the right and up the periodic table.
by 905416023
Mon Nov 04, 2019 9:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.23 Number of Orbitals question
Replies: 2
Views: 153

Re: 1D.23 Number of Orbitals question

You can tell how many orbitals there are by the l number. For example, the s has 1 orbital, p has 3, d has 5, and f has 7.
by 905416023
Mon Nov 04, 2019 9:43 pm
Forum: Properties of Light
Topic: When do you use light equations?
Replies: 3
Views: 102

Re: When do you use light equations?

I'm confused about this too. in some of the review sessions, they mentioned that there were only certain instances where the equation could be used. And you needed to know when.
by 905416023
Mon Nov 04, 2019 9:42 pm
Forum: Lewis Structures
Topic: Double Bonds
Replies: 3
Views: 68

Re: Double Bonds

You have to focus on the formal charge to decide when to place a double bond. Whichever structure results in the lowest formal charge is the one you want.
by 905416023
Mon Nov 04, 2019 9:36 pm
Forum: Octet Exceptions
Topic: Octet Rule exceptions
Replies: 14
Views: 322

Re: Octet Rule exceptions

The 3rd period and after I believe it is.
by 905416023
Mon Oct 28, 2019 11:47 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 4
Views: 63

Re: Drawing Lewis Structures

You only have to include additional resonance structures if it asks you to (One of the UA's said this today in a review session). As far as the formal charge goes, I think you should include it just to be safe, but I'm not sure if its always needed. It will help you to determine if your structure is...
by 905416023
Mon Oct 28, 2019 11:44 pm
Forum: Trends in The Periodic Table
Topic: Ionic Radius
Replies: 5
Views: 165

Re: Ionic Radius

Are there exceptions to the ionic radius trend? Like any elements that don't follow it?
by 905416023
Mon Oct 28, 2019 11:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1.13
Replies: 2
Views: 64

Re: 1.13

Honestly I don't understand this either. It seems like there are so many exceptions to rules in Chemistry and it just makes no sense.
by 905416023
Mon Oct 28, 2019 11:33 pm
Forum: *Particle in a Box
Topic: Topic 1C
Replies: 3
Views: 146

Re: Topic 1C

I believe we do need to know 1C. On the syllabus, it says to read Appendix 1B, 1C, 1D, 1E. So we should probably know it if we were expected to read it.
by 905416023
Mon Oct 28, 2019 11:31 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 5
Views: 79

Resonance

For resonance structures, do they have to follow the octate rule? And if not, when?
by 905416023
Mon Oct 21, 2019 11:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: f- orbitals?
Replies: 7
Views: 76

Re: f- orbitals?

I too am confused about this. On problem 1d.25, there is mention of a g subshell.
by 905416023
Mon Oct 21, 2019 10:57 pm
Forum: Trends in The Periodic Table
Topic: 1F. 19
Replies: 1
Views: 35

1F. 19

The question asks "Why are s-block metals typically more reactive than p-block metals?" I think we discussed this topic a little bit in class today with how the size of them makes them react more? I'm not exactly sure though. Can someone by chance help?
by 905416023
Mon Oct 21, 2019 10:45 pm
Forum: Trends in The Periodic Table
Topic: Homework #4
Replies: 5
Views: 78

Re: Homework #4

I am doing this week's homework on the quantum world. I think that is correct because the next section of homework doesn't really make sense yet.
by 905416023
Mon Oct 21, 2019 10:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find what material you missed if you missed a class?
Replies: 4
Views: 48

Re: Where to find what material you missed if you missed a class?

I always take pictures of the class slides. If you want them, just respond to this post with your email :)
by 905416023
Mon Oct 21, 2019 10:43 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D. 23)
Replies: 5
Views: 121

1D. 23)

On problem 1D.23 I am having trouble. How do I begin to know how many orbitals can have the following quantum numbers in an atom? The concept, in general, confuses me, not just this specific question.
by 905416023
Tue Oct 15, 2019 2:33 pm
Forum: Properties of Light
Topic: Homework
Replies: 11
Views: 120

Re: Homework

Yes, they can be any of the 5 questions off the syllabus. it doesn't matter which ones you choose.
by 905416023
Tue Oct 15, 2019 2:31 pm
Forum: Einstein Equation
Topic: Meaning of h [ENDORSED]
Replies: 5
Views: 113

Meaning of h [ENDORSED]

In the equation E=hv, what does h represent? I know it is the number 6.63x10^-34, but I'm confused with what the number represents.
by 905416023
Tue Oct 15, 2019 2:25 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 7
Views: 116

De Broglie Wavelength

When a question asks to calculate the De Broglie Wavelength, does that mean there is a certain wavelength that is specific to De Broglie? I thought it was just an equation to calculate wavelength in general, not a totally different wavelength. But the way some of these questions are worded it has me...
by 905416023
Tue Oct 15, 2019 2:19 pm
Forum: Properties of Electrons
Topic: Angstrom Conversion
Replies: 12
Views: 174

Re: Angstrom Conversion

It is 1 angstrom to 10^-10 m
by 905416023
Tue Oct 15, 2019 1:39 pm
Forum: Properties of Light
Topic: Question 1A.5
Replies: 4
Views: 72

Question 1A.5

For this question, it says to list the types of photons of electromagnetic radiation in the order of increasing energy. Does this mean smallest to biggest?
by 905416023
Thu Oct 10, 2019 3:12 pm
Forum: Trends in The Periodic Table
Topic: Chemistry Community
Replies: 4
Views: 85

Re: Chemistry Community

They are all due Sunday night. You can ask a question, make a post, respond to other people, etc.
by 905416023
Thu Oct 10, 2019 3:08 pm
Forum: Limiting Reactant Calculations
Topic: Test 1 Calculator
Replies: 6
Views: 250

Test 1 Calculator

Why can't we use a graphing calculator on the tests?
by 905416023
Thu Oct 10, 2019 3:06 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 20
Views: 518

Re: Balancing Chemical Reactions

I too would like to know if there is a quicker way for these more complex reactions. I'm usually just stuck plugging in numbers for quite a while until I can balance them.
by 905416023
Thu Oct 10, 2019 3:02 pm
Forum: Student Social/Study Group
Topic: readings
Replies: 13
Views: 294

Re: readings

On the syllabus, it says which homework problems we can pick from. What I do is read the sections the homework problems are in. That way you're reading the information that is imperative to do the homework and therefore do well on the tests.
by 905416023
Thu Oct 10, 2019 2:59 pm
Forum: SI Units, Unit Conversions
Topic: Course Reader
Replies: 6
Views: 187

Re: Course Reader

There is not a course reader. There is a required book though. It is titled "Chemical Principals the quest for insight" it is the 7th addition. You can purchase it in a bundle at the UCLA bookstore. The bundle will include a loose-leaf version of the book, online access to the book, and a ...
by 905416023
Wed Oct 02, 2019 9:36 pm
Forum: SI Units, Unit Conversions
Topic: Next Week's Test
Replies: 8
Views: 201

Re: Next Week's Test

The test will only be on the fundamentals. The first day it will be given out is Tuesday, October 8th in your discussion section. Every discussion will get it next week from Tuesday- Friday.
by 905416023
Wed Oct 02, 2019 9:03 pm
Forum: SI Units, Unit Conversions
Topic: Sig figs
Replies: 18
Views: 325

Re: Sig figs

What if the question doesn't have numbers in it? Should I just do it to 3?
by 905416023
Wed Oct 02, 2019 8:25 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.7 calculate atoms in moles
Replies: 4
Views: 75

Re: E.7 calculate atoms in moles

I took the 2.1 x 10^9 atoms of C and divided it by Avogadro's number, or 6.022 x 10^23. This gives you the moles of carbon because you are dividing atoms of carbon by atoms per moles, which leaves you with moles of carbon. You have canceled out the atoms.
by 905416023
Wed Oct 02, 2019 8:19 pm
Forum: SI Units, Unit Conversions
Topic: Calculator Question
Replies: 13
Views: 279

Re: Calculator Question

I just got the TI-30X IIS 2-Line Scientific Calculator. It was about $13. It seems like that is what most people have had for this course in the past.
by 905416023
Wed Oct 02, 2019 8:18 pm
Forum: SI Units, Unit Conversions
Topic: Sig figs
Replies: 18
Views: 325

Re: Sig figs

it seems like for the most part many of the problems are only to 2 sig figs.
by 905416023
Wed Oct 02, 2019 8:03 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Problem E3
Replies: 2
Views: 51

Problem E3

How are you guys showing your work? I just divided 630g.mol by 210 g.mol. I'm not sure if I should add units or if I should show any more work.

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