Search found 33 matches
- Wed Dec 05, 2018 10:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21934
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thank you so much for all your help. This is extremely appreciated.
- Wed Dec 05, 2018 9:27 pm
- Forum: Naming
- Topic: Tricks/cheat sheet
- Replies: 3
- Views: 466
Tricks/cheat sheet
Does anybody have any tricks or a cheat sheet for naming compounds?
- Wed Dec 05, 2018 9:19 pm
- Forum: Naming
- Topic: 7th edition 9.C1
- Replies: 2
- Views: 454
7th edition 9.C1
The question is:
Name each of the following complex ions and identify the oxidation number of the metal
a. [Fe(CN)6]^4-
b. [Co(NH3)6]^3+
c. [Co(CN)5(OH)2]^2-
d. [Co(NH3)5(SO4)]^+
When do you know when to write cobalt vs cobaltate or iron vs ferrate?
Thanks :)
Name each of the following complex ions and identify the oxidation number of the metal
a. [Fe(CN)6]^4-
b. [Co(NH3)6]^3+
c. [Co(CN)5(OH)2]^2-
d. [Co(NH3)5(SO4)]^+
When do you know when to write cobalt vs cobaltate or iron vs ferrate?
Thanks :)
- Wed Dec 05, 2018 6:06 pm
- Forum: Naming
- Topic: Difference between cis and trans
- Replies: 4
- Views: 451
Re: Difference between cis and trans
Ligands on the same side of a molecule is cis and the opposite is trans.
This is why we cis and trans fat.
This is why we cis and trans fat.
- Wed Dec 05, 2018 6:04 pm
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 4
- Views: 479
Re: Naming Coordination Compounds
We have to memorize them.
- Mon Nov 26, 2018 11:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T shaped
- Replies: 6
- Views: 595
Re: T shaped
AX3E2 means that an atom is bonded to 3 other atoms and also has 2 lone pairs.
If it had just one lone pair it would be trigonal pyramidal but because of the second lone pair, it changes the angles and is now considered to be T-shaped.
If it had just one lone pair it would be trigonal pyramidal but because of the second lone pair, it changes the angles and is now considered to be T-shaped.
- Mon Nov 26, 2018 10:55 pm
- Forum: Hybridization
- Topic: Question from textbook
- Replies: 4
- Views: 505
Re: Question from textbook
When we find the lewis dot structure for BrF3 we realize that it is T-shaped. It is bonded to 3 atoms and has 2 lone pairs. The electron density or electron arrangement is 5. The atomic orbitals has to match the number of hybrid orbitals. In sp^3d: there are 5 hybrid orbitals.
- Mon Nov 26, 2018 10:51 pm
- Forum: Hybridization
- Topic: 2.45 7th Edition
- Replies: 1
- Views: 282
2.45 7th Edition
Can someone please explain 2.45 from the 7th Edition to me?
The question is as follows.
Consider the bonding in H2C=CHCHO.
a) Draw the most important Lewis structure.
b) Identify the composition of the bonds and the hybridization of each lone pair; for example, by writing sigma(H1s,C2sp^2).
The question is as follows.
Consider the bonding in H2C=CHCHO.
a) Draw the most important Lewis structure.
b) Identify the composition of the bonds and the hybridization of each lone pair; for example, by writing sigma(H1s,C2sp^2).
- Tue Nov 20, 2018 11:43 pm
- Forum: Hybridization
- Topic: Electron Density vs Shape?
- Replies: 6
- Views: 725
Electron Density vs Shape?
What is the difference between electron density and shape? Why do we find two different names for the same molecule?
- Tue Nov 20, 2018 11:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 179667
Re: How to find my posts
Click "Quick Links" in the top left corner and then "My Posts."
- Tue Nov 20, 2018 11:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 5
- Views: 581
Re: VSEPR
Yes, lone pairs do affect the shape and structure. For example it can determine the difference between linear and bent.
- Tue Nov 20, 2018 11:35 pm
- Forum: Student Social/Study Group
- Topic: Discussion on Wednesday
- Replies: 4
- Views: 571
Re: Discussion on Wednesday
Discussions on Wednesday are not canceled.
- Tue Nov 20, 2018 11:32 pm
- Forum: Hybridization
- Topic: Test 3
- Replies: 8
- Views: 835
Re: Test 3
Test 3 will cover : "End of Bonding from 3.12 (6 Ed.) and from 2D (7 Ed.); and all of Molecular Shape and Structure (see Syllabus and Outlines for details)."
- Wed Nov 14, 2018 1:20 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 dates?
- Replies: 11
- Views: 1348
Re: Test 3 dates?
I thought test 3 was going to be during Week 8.
- Tue Nov 06, 2018 5:59 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 5
- Views: 638
Re: Bond Lengths
Usually, in a bond length, specific bond lengths will be given to you. For example, let's say you are given that a C=0 bond is a given length, x. If you see that in your lewis structure you have in total three bonds and each of these 3 bonds are a C=0 (C double bonded to an 0), then you know all the...
- Tue Nov 06, 2018 5:54 pm
- Forum: Limiting Reactant Calculations
- Topic: Reactant vs. Reagent
- Replies: 1
- Views: 491
Re: Reactant vs. Reagent
Yes, they are the same thing. You can use reactant and reagent interchangeably.
- Tue Nov 06, 2018 5:53 pm
- Forum: Student Social/Study Group
- Topic: Test & Exam Dates
- Replies: 4
- Views: 519
Re: Test & Exam Dates
Test 3 will be during your discussion session on Week 8. The final exam is scheduled for the 9th of December.
- Tue Oct 30, 2018 9:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Blue Book Midterm
- Replies: 4
- Views: 559
Blue Book Midterm
Do we need to buy a blue book for the midterm or will the midterm be like our usual tests without the blue book?
- Tue Oct 30, 2018 9:11 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 7274
Re: Formal charge purpose
Because of resonance, you can create various different structures of the same compound. But the version with the lowest formal charge is the most suitable. For this reason, we calculate formal charge.
- Tue Oct 30, 2018 9:07 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 13
- Views: 934
Re: Central Atom
H is never a central atom, so you know that for sure. You then look at the other two elements, C and O. C is the central atom because it has the lowest ionization energy. So connect C and O with a bond, and then put 3 H's on the C and one H on the O. Don't forget to add 2 lone pairs to O.
- Tue Oct 23, 2018 5:14 pm
- Forum: DeBroglie Equation
- Topic: 1B 15 7th edition
- Replies: 6
- Views: 724
Re: 1B 15 7th edition part C
For 1B 15 c : The question is: What is the wavelength of the radiation that caused photoejection of the electron? So first we have to find the Energy of this wavelength. We know the threshold energy from part 1B 15 b=1.66x10^-17. We also know that: Energy (per photon) - threshold energy =Ek We can r...
- Tue Oct 23, 2018 12:16 pm
- Forum: Student Social/Study Group
- Topic: Studying for tests/midterm
- Replies: 18
- Views: 2831
Re: Studying for tests/midterm
Dr. Lavelle said that the best way to study for tests is to make sure you can do all the homework problems. Also, on the class syllabus, it says that one of the questions on the test is from the homework problems.
- Mon Oct 22, 2018 4:05 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 1.A15. (7th edition)
- Replies: 1
- Views: 219
1.A15. (7th edition)
How do we solve 1.A.15 without using the Rydberg equation? I've been told we have to use En=-hR/n^2 but I am a little lost.
- Mon Oct 22, 2018 3:59 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 7th edition HW Problem 1.A15
- Replies: 2
- Views: 320
Re: 7th edition HW Problem 1.A15
Wait, actually, sorry. My TA said we can't use the equation from the book. We are supposed to use another one, so the above explanation is wrong. Sorry.
- Tue Oct 16, 2018 9:09 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 7th edition HW Problem 1.A15
- Replies: 2
- Views: 320
Re: 7th edition HW Problem 1.A15
For a line at 102.6nm, we know that n1=1. Then use the equation c=(wavelength)(frequency), but rearrange it to look like: v= c/(wavelength) So: v=(2.998x10^8)/(102.6x10^-9) =2.922x10^15 s^-1. We then need to find n2. Use this equation: v=R((1/n1^2) - (1/n2^2). Then you will get this if you rearrange...
- Tue Oct 16, 2018 8:52 pm
- Forum: Trends in The Periodic Table
- Topic: Homework
- Replies: 10
- Views: 763
Re: Homework
Make sure you talk to your TA, but any 7 problems from outline 2 should be fine!
- Tue Oct 16, 2018 8:46 pm
- Forum: Properties of Light
- Topic: Test 2
- Replies: 17
- Views: 1353
Re: Test 2
Test 2 is about outline 2. Do the modules and the problems from the hw about the quantum world. I'm pretty sure the tests aren't cumulative, that is until we get to the midterm or final.
- Tue Oct 09, 2018 9:08 pm
- Forum: SI Units, Unit Conversions
- Topic: Units
- Replies: 8
- Views: 666
Re: Units
I don't know if points will be taken off, but I would try to include units as much as possible just in case. We are supposed to show work, so this might contribute to that.
- Tue Oct 09, 2018 9:05 pm
- Forum: Empirical & Molecular Formulas
- Topic: Compound Names
- Replies: 9
- Views: 856
Re: Compound Names
I don't think this will be a key point on Test 1. I can't say for sure, but I feel like he will give us the name of the compounds. Probably for future tests, we will need to know them though.
- Tue Oct 09, 2018 6:42 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Online Module Problem Dilutions
- Replies: 2
- Views: 774
Online Module Problem Dilutions
I don't understand how to solve this problem. Can somebody help? 5.00 g of KMnO4 is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with water, what is the concentration of the solution in the 2nd flask? Molar Masses...
- Wed Oct 03, 2018 4:52 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy vs Precision
- Replies: 23
- Views: 2751
Re: Accuracy vs Precision
How can values be accurate but not precise? If all the values are accurate (close to the true value) how can they still be not precise in relation to each other Values can be accurate but not precise because each measurement may be close to the true value (relatively) however not relatively close e...
- Wed Oct 03, 2018 4:43 pm
- Forum: Balancing Chemical Reactions
- Topic: notation
- Replies: 4
- Views: 503
Re: notation
I think that you should include them. You might get a point off on a homework or a test for not doing so.
- Wed Oct 03, 2018 4:40 pm
- Forum: Significant Figures
- Topic: Do sig figs only refer to decimals?
- Replies: 3
- Views: 274
Re: Do sig figs only refer to decimals?
From my understanding, I think sig figs represent all the digits, not just the figures after the decimal point. 1.02, for example has 3 sig figs.