Search found 32 matches
- Wed Dec 05, 2018 10:39 am
- Forum: Lewis Acids & Bases
- Topic: Problem 12.15 6th Edition
- Replies: 2
- Views: 326
Re: Problem 12.15 6th Edition
You're only using 16 valence electrons if both oxygens have a double bond and you want to be using 18.
- Sun Dec 02, 2018 8:26 pm
- Forum: Naming
- Topic: 7.29 6th edition Cobalt vs Colbaltate
- Replies: 1
- Views: 296
7.29 6th edition Cobalt vs Colbaltate
So for this question it was asking for the names of different coordination compounds, several of which had cobalt as the metal to which the ligands are bound. The compounds were b) [Co(NH3)6] 3+, c)[Co(CN)5(OH2)]2-, and d) [Co(SO4)(NH3)5]+. For b and d, cobalt was just called cobalt in the full name...
- Sun Dec 02, 2018 3:34 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral vs square planar
- Replies: 1
- Views: 313
Tetrahedral vs square planar
How can you tell if a coordination compound will form a tetrahedral complex vs a square planar one?
- Sun Dec 02, 2018 11:59 am
- Forum: Administrative Questions and Class Announcements
- Topic: More practice
- Replies: 7
- Views: 983
More practice
Does anyone have any resources for more practice problems, other than the HW and worksheets on Chemistry Community? Thanks!
- Sun Dec 02, 2018 11:56 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid vs base [ENDORSED]
- Replies: 15
- Views: 1564
Re: Acid vs base [ENDORSED]
How do these definitions differ from the Bronsted definitions?
- Sun Dec 02, 2018 11:56 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid vs base [ENDORSED]
- Replies: 15
- Views: 1564
Re: Acid vs base [ENDORSED]
A lewis acid is an electron accepter while a base is an electron donor.
- Sun Dec 02, 2018 11:54 am
- Forum: Lewis Acids & Bases
- Topic: Bronsted vs. Lewis
- Replies: 3
- Views: 363
Re: Bronsted vs. Lewis
I'm also confused about this. What is the definition of a Lewis acid/base and Bronsted acid/base? What is the significance of the difference between these terms?
- Thu Nov 29, 2018 7:33 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation numbers
- Replies: 1
- Views: 298
Oxidation numbers
Could someone explain how to find the oxidation number for [Fe(CN)6]^4-?
- Tue Nov 27, 2018 1:09 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: Size and Strength of Attractive forces
- Replies: 2
- Views: 359
Size and Strength of Attractive forces
Why does the increasing size or molar mass of a molecule result in stronger attractive interactions?
- Mon Nov 26, 2018 7:46 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: HW 6th edition 4.25a
- Replies: 1
- Views: 264
HW 6th edition 4.25a
So the question is asking for the lewis structure of CH2Cl2 and whether it is polar or nonpolar. I'm confused because if you draw the lewis structure with the Cl's across from each other, then the molecule is nonpolar whereas when you draw the lewis structure with the Cl's next to each other the str...
- Mon Nov 26, 2018 8:24 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: Water as a solvent
- Replies: 2
- Views: 526
Water as a solvent
Why does water's structure/polarity make it a good solvent?
- Sun Nov 18, 2018 10:17 pm
- Forum: Sigma & Pi Bonds
- Topic: Visualizing sigma and pi bonds
- Replies: 7
- Views: 793
Re: Visualizing sigma and pi bonds
Thank you everyone for all the resources!!!
- Sun Nov 18, 2018 9:27 pm
- Forum: Sigma & Pi Bonds
- Topic: Visualizing sigma and pi bonds
- Replies: 7
- Views: 793
Visualizing sigma and pi bonds
Does anyone have any resources for how to visualize sigma and pi bonds?
- Sun Nov 18, 2018 9:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T Shaped
- Replies: 3
- Views: 583
T Shaped
I'm confused about how a T shaped molecule works? Could someone explain how the lone pairs affect the structure?
- Sun Nov 18, 2018 1:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angular vs Bent
- Replies: 4
- Views: 495
Angular vs Bent
Are angular and bent the same molecular shape?
- Sun Nov 18, 2018 12:24 pm
- Forum: General Science Questions
- Topic: Audio Visuals
- Replies: 6
- Views: 839
Re: Audio Visuals
Does anyone know of any resources similar to the audio visuals for the other topics this quarter? Do people find Khan academy helpful, or crash course videos?
- Sat Nov 17, 2018 4:01 pm
- Forum: General Science Questions
- Topic: Exciting Chemistry News!
- Replies: 2
- Views: 540
Exciting Chemistry News!
I wanted to share a news article I found that was chemistry related and that I found very interesting! It's about a recent change to how a kilogram is defined.
https://www.usatoday.com/story/news/201 ... 023420002/
https://www.usatoday.com/story/news/201 ... 023420002/
- Wed Nov 14, 2018 11:03 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Multiple bonds
- Replies: 2
- Views: 325
Multiple bonds
When determining the molecular shape and electron arrangement, should you just treat single and multiple bonds the same? Because that's what I thought the textbook said, but it seemed like my TA was saying something different...
- Tue Nov 13, 2018 4:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Which way to put greater than/less than signs
- Replies: 2
- Views: 699
Which way to put greater than/less than signs
Sorry, dumb question: When the textbook says to order something in increasing order, which way do you put the greater than/less than symbols?
- Sat Nov 03, 2018 8:45 pm
- Forum: Trends in The Periodic Table
- Topic: Exceptions to ionization energy
- Replies: 1
- Views: 316
Exceptions to ionization energy
In review session today the UA went over some exceptions to ionization energy trends for Carbon and Nitrogen. Could someone explain these exceptions in more detail?
- Sat Nov 03, 2018 8:43 pm
- Forum: Lewis Structures
- Topic: Cations and Anions
- Replies: 3
- Views: 398
Cations and Anions
What exactly is the definition of a cation and an anion?
- Sat Nov 03, 2018 8:42 pm
- Forum: Lewis Structures
- Topic: Radicals?
- Replies: 4
- Views: 364
Radicals?
Are radicals going to be on the midterm?
- Fri Oct 26, 2018 4:25 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3615179
Re: Post All Chemistry Jokes Here
A photon walks into a hotel. The bellhop says "Can we help you with your luggage?". The photon replies, "No thanks, I'm traveling light"
- Fri Oct 26, 2018 4:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Valence Electrons
- Replies: 4
- Views: 733
Valence Electrons
How do you know how may valence electrons an element or compound has?
- Fri Oct 26, 2018 2:19 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 8
- Views: 731
Re: Electron Affinity
I think that looking at it diagonally from the bottom left to top right is probably the easiest way to look at the trend for electron affinity
- Thu Oct 18, 2018 7:26 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 1.15 Homework Problem
- Replies: 2
- Views: 286
Re: 1.15 Homework Problem
If you get a negative energy, should you still plug a positive value into the wavelength equation?
- Thu Oct 18, 2018 7:25 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 3
- Views: 338
Re: Rydberg Equation
Will we get points off if we use it on the test? Or does it not matter as long as we get the right answer?
- Thu Oct 18, 2018 7:22 pm
- Forum: Properties of Electrons
- Topic: eV to J
- Replies: 7
- Views: 960
eV to J
Whats the conversion for eV to J? Should we memorize this conversion factor?
- Thu Oct 11, 2018 8:52 pm
- Forum: Properties of Light
- Topic: Do I need to memorize the Light Spectrum? [ENDORSED]
- Replies: 13
- Views: 974
Re: Do I need to memorize the Light Spectrum? [ENDORSED]
I don't think you need to memorize exact values. Just having a general idea and being able to approximate the wavelengths for each major type (UV, infrared, etc...) is sufficient.
- Thu Oct 11, 2018 8:51 pm
- Forum: Properties of Light
- Topic: HW 1A.9 [ENDORSED]
- Replies: 4
- Views: 322
Re: HW 1A.9 [ENDORSED]
I think you use E=hc/wavelength which was an equation we derived last lecture from E=hv and c=wavelength x v
- Thu Oct 11, 2018 8:44 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Mass percent composition [ENDORSED]
- Replies: 4
- Views: 888
Re: Mass percent composition [ENDORSED]
Yes, mass percentage composition is simply the percentage of the mass of a certain element in a compound. So you take the mass of the element divided by the molar mass of the entire compound and times 100%
- Thu Oct 04, 2018 4:13 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 8690
Re: How does grading for discussion posts work?
Does it matter if we respond to a question that's already been answered or do we just need to make three posts?