Search found 52 matches
- Sun Dec 08, 2019 10:52 am
- Forum: Biological Examples
- Topic: porphyrin
- Replies: 3
- Views: 428
Re: porphyrin
I think we just need to know that its the ligand that finds with fe to make a heme complex and that it is tetradenate.
- Sun Dec 08, 2019 10:52 am
- Forum: Lewis Acids & Bases
- Topic: Strong Acids vs weak
- Replies: 2
- Views: 338
Re: Strong Acids vs weak
Yeah, if you memorize the strong acids you can assume all the other ones are weak acids.
- Sun Dec 08, 2019 10:51 am
- Forum: Hybridization
- Topic: 2sp2 and sp2
- Replies: 10
- Views: 884
Re: 2sp2 and sp2
I think Linden said in the review session that we can just write sp2
- Sun Dec 08, 2019 10:50 am
- Forum: Biological Examples
- Topic: en and edta
- Replies: 6
- Views: 659
Re: en and edta
yes, I think so.
For en I think we should also know the formula which is NH2CH2CH2NH2
For en I think we should also know the formula which is NH2CH2CH2NH2
- Sun Dec 08, 2019 10:49 am
- Forum: Conjugate Acids & Bases
- Topic: Finding Conjugate A and B
- Replies: 6
- Views: 415
Re: Finding Conjugate A and B
yes, for conjugate acids, add an H+ and for conjugate bases remove and H+
- Sun Dec 08, 2019 10:48 am
- Forum: Conjugate Acids & Bases
- Topic: Finding Conjugate A and B
- Replies: 6
- Views: 415
Re: Finding Conjugate A and B
yes, for conjugate acids, add an H+ and for conjugate bases remove and H+
- Sun Dec 01, 2019 3:53 pm
- Forum: Sigma & Pi Bonds
- Topic: Drawing Sigma and Pi bonds
- Replies: 7
- Views: 785
Re: Drawing Sigma and Pi bonds
I think you are suppose to individually label the two bonds in the double bond, one as sigma and one as pi, rather than labeling them both at pi +sigma.
- Sun Dec 01, 2019 3:48 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Hw problem 9C1.A
- Replies: 2
- Views: 205
Re: Hw problem 9C1.A
hexacyanoferrate(II) ion
hexa-cyano because cyano is the name of the ligand CN-
ferrate because this is the name of Fe with -ate added to the end to indicate that the entire ion is negative
hexa-cyano because cyano is the name of the ligand CN-
ferrate because this is the name of Fe with -ate added to the end to indicate that the entire ion is negative
- Sun Dec 01, 2019 3:46 pm
- Forum: Student Social/Study Group
- Topic: Final topics
- Replies: 10
- Views: 575
Re: Final topics
I can confirm that the final is cumulative; however, I think it will focus more on the topics we have not been tested on yet.
- Sun Dec 01, 2019 3:44 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Hw 9C1. PART C
- Replies: 1
- Views: 151
Re: Hw 9C1. PART C
aquapentacyanocolbaltate(III) ion
aqua because it is the name of H2O
penta-cyano because cyan is the same of CN- and there are 5 of them
cobaltate (III) because cobalt is the name of Co and it is a negative ion so you must add an -ate to the end of the metal
aqua because it is the name of H2O
penta-cyano because cyan is the same of CN- and there are 5 of them
cobaltate (III) because cobalt is the name of Co and it is a negative ion so you must add an -ate to the end of the metal
- Sun Dec 01, 2019 3:41 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: meaning of edta and en
- Replies: 1
- Views: 189
Re: meaning of edta and en
en means bidentate; edta means hexadentate.
- Sun Nov 24, 2019 10:16 pm
- Forum: Naming
- Topic: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
- Replies: 11
- Views: 1007
Re: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
They are used if the ligand you are naming already has a name with di-, tri-, tetra-, tetra-
- Sun Nov 24, 2019 10:10 pm
- Forum: General Science Questions
- Topic: Week 9 HW
- Replies: 6
- Views: 489
Re: Week 9 HW
I believe week 9 homework can be done on anything covered after the week 8 test we took.
- Sun Nov 24, 2019 10:07 pm
- Forum: Sigma & Pi Bonds
- Topic: Molecular Shape
- Replies: 11
- Views: 756
Re: Molecular Shape
sigma and pi bonds do not effect the lewis structure; however, they do effect how the molecule is shaped and how its shape can change because sigma bonds allow for more rotations and movement of the molecules whereas pi bonds do not allow for this full range of motion.
- Sun Nov 24, 2019 10:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hybridization
- Replies: 7
- Views: 467
Re: Hybridization
hybridization gives an explanation or at least helps to explain a molecules structure when the valance bond theory fails to predict the structure correctly.
- Sun Nov 24, 2019 10:00 pm
- Forum: Sigma & Pi Bonds
- Topic: sigma and pi bonds
- Replies: 27
- Views: 1736
Re: sigma and pi bonds
All single bonds are sigma bonds. All double bonds have one pi bond and one sigma bond. All triple bonds have one sigma bond and two pi bonds and so on. Pi bonds do not allow the molecule to rotate as much as sigma bonds do.
- Sun Nov 17, 2019 6:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dispersion
- Replies: 5
- Views: 354
Re: Dispersion
I believe it is only dipole-dipole, london forces and hydrogen bonding because we have not had a lecture about dispersion and induced dipole yet; but, if lecture this Monday covers these topics and we may have to know it for the test. I would just make sure to know everything covered in lecture up t...
- Sun Nov 17, 2019 6:04 pm
- Forum: Lewis Structures
- Topic: Noble gases
- Replies: 3
- Views: 299
Re: Noble gases
Xeon and other noble gases with 8 electrons in their valence shells can still form covalent bonds because of their expanded octet.
- Sun Nov 17, 2019 5:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: two central atoms
- Replies: 3
- Views: 242
Re: two central atoms
if there are two central atoms, you treat each central atom as its own thing
- Sun Nov 17, 2019 5:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 19
- Views: 906
Re: Test 2
When drawing the Lewis Dot structures I think it is important to make sure you have placed the correct amount of double bonds and single bonds and lone pairs around all of the atoms; however, I don't think it is important to make sure your drawing is depicting the correct angles of the bonds because...
- Sun Nov 17, 2019 5:45 pm
- Forum: Student Social/Study Group
- Topic: test 2
- Replies: 8
- Views: 436
Re: test 2
I think it will be around the same length at test #1 and it is worth 50 points
- Sun Nov 10, 2019 11:32 pm
- Forum: Student Social/Study Group
- Topic: Midterm Grades
- Replies: 7
- Views: 578
Re: Midterm Grades
Yes, I can confirm hearing that we will get our midterms back on Wednesday but am not sure if this means we just get just the grade of our midterm or if we get our actual midterm. It would make the most sense to me if we just got our grades on Wednesday and then were returned the hard copy of our mi...
- Sun Nov 10, 2019 11:30 pm
- Forum: Bond Lengths & Energies
- Topic: Interaction Potential Energy equation
- Replies: 7
- Views: 482
Re: Interaction Potential Energy equation
I am also confused on this concept and would love if anyone could help.
- Sun Nov 10, 2019 11:25 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 427202
Re: Final Jitters
I am sure Lavelle and our TA's will cover this in class next week; however, as far as I know, we will get our midterms back before the final and be able to study them without a tutor.
- Sun Nov 10, 2019 11:23 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Calculations
- Replies: 2
- Views: 184
Re: Polarizing Calculations
I am not sure if we are going to have to do this for the upcoming test. I think it is best to email your TA and ask them but I also think doing the homework problems is the best way to study so if you have to calculate how polarizing an atom is using electronegativity in any of the homework problems...
- Fri Nov 08, 2019 7:21 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: H bonds and Intermolecular Forces
- Replies: 4
- Views: 306
Re: H bonds and Intermolecular Forces
Its all just based on attraction. They are not actually sharing electrons, it is just that they are attracted to each other because of their partial negative and partial positive charges.
- Sat Nov 02, 2019 9:16 pm
- Forum: Bond Lengths & Energies
- Topic: bond length
- Replies: 6
- Views: 308
Re: bond length
If it is possible, we have not learned it. However, it is easy to infer the relative strength of the bond through the length of the bond. Short bonds are stronger than long bonds.
- Sat Nov 02, 2019 9:14 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Diamagnetic and Paramagnetic
- Replies: 1
- Views: 1080
Re: Diamagnetic and Paramagnetic
If it was never mentioned in lecture and there were no practice problems assigned for it, I am pretty sure we do not need to know it for the midterm.
- Sat Nov 02, 2019 9:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionic vs. covalent
- Replies: 7
- Views: 392
Re: ionic vs. covalent
Covalent molecules share electrons, this is shown by a line in between the atoms. Ionic molecules do not share electrons.
- Sat Nov 02, 2019 9:09 pm
- Forum: Ionic & Covalent Bonds
- Topic: Lewis Structure for Ionic Bonds
- Replies: 4
- Views: 162
Re: Lewis Structure for Ionic Bonds
I think ions on their own generally are not bracketed, such as Cl-; however, ionic compounds are bracketed. So, when there are multiple atoms that make up a molecule that has a charge all together, there should be a bracket to show that it is the entire molecule that is charged, not just one atom in...
- Sat Nov 02, 2019 9:04 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: initial and final variables
- Replies: 4
- Views: 300
Re: initial and final variables
Yes, I agree, there is unfortunately no "formula" for knowing which values come first and second in the equation. You must just read the question carefully. Good Luck!
- Sun Oct 27, 2019 3:37 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 5
- Views: 212
Re: Lewis Structure
I agree with the earlier answers. I believe the main reason and the reason expressed most to us in Lecture was that the structure with 2 double bonds has a formal charger closer to 0 than the structure with 4 single bonds. When drawing Lewis Structures, you always want to option with the formal char...
- Sun Oct 27, 2019 3:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 10
- Views: 432
Re: Resonance
When a molecule has resonance it means its structure is always switching or changing. It doesn't always have to be 3 shapes or bond lengths that it switches between; it can be 2 or 4 ect. And it is not that 3 different structures exist of the molecule, but rather that the molecule is constantly swit...
- Sun Oct 27, 2019 3:24 pm
- Forum: Lewis Structures
- Topic: expanded-octet
- Replies: 4
- Views: 192
Re: expanded-octet
The d subshell of an atom has 5 orbital and can therefore fit 10 electrons, meaning there can be 10 valence electrons rather than only 8.
- Sat Oct 26, 2019 1:17 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization energy
- Replies: 12
- Views: 648
Re: Ionization energy
Ionization energy is defined as the minimum amount of energy required to remove the most loosely bound electron from an atom or molecule in gas state. The tighter a molecules radius, the harder to remove an electron from it. Thats how I like to think of it. So as atomic radius increases, ionization ...
- Sat Oct 26, 2019 1:14 pm
- Forum: Resonance Structures
- Topic: Observed Bond Lengths
- Replies: 3
- Views: 159
Re: Observed Bond Lengths
Yes, that is one way to think about it. Electrons are constantly changing which atoms they are being shared between. It is important to remember that electrons are always moving, they are not stationary.
- Sun Oct 20, 2019 8:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework week 4
- Replies: 4
- Views: 271
Re: Homework week 4
I can also confirm that week 4's homework is suppose to be from the quantum world section and therefore you can pick any of the problems from the quantum world section that you have not done for another homework yet.
- Sun Oct 20, 2019 8:21 pm
- Forum: Photoelectric Effect
- Topic: 1B19
- Replies: 3
- Views: 249
Re: 1B19
All you have to do for this problem is use the equation "wavelength= h/ (mass x velocity)" You are trying to find the wavelength and you already have h and velocity and all you have to do is look up the mass of a proton and a neutron. The masses are very similar. Once you calculate the wav...
- Sun Oct 20, 2019 8:18 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: electron configuration exceptions
- Replies: 3
- Views: 115
Re: electron configuration exceptions
Thank you, this was very helpful!
- Sun Oct 20, 2019 8:17 pm
- Forum: Properties of Light
- Topic: 1B. 5
- Replies: 2
- Views: 126
Re: 1B. 5
The first step is to convert the energy units from keV to Joules. - 140x10^3 eV x (1.6022 x10^19 joules/ 1 eV) = 2.2513 x 10^-14 Joules Next you can use the formula wavelength= hc/E to find the wavelength - wavelength= (6.626x10^-34 X 2.9x10^8)/ (2.2513x10^-14) which equals 8.82 x 10^-12m or 8.82pm
- Sun Oct 20, 2019 8:09 pm
- Forum: Properties of Light
- Topic: Question 1A.15
- Replies: 5
- Views: 273
Re: Question 1A.15
First, you must recognize that the ultraviolet spectrum of atomic hydrogen is the lyman series and its n1 = 1. Then you use the equation v=c/lambda to calculate v. (v= 2.998 *10^8/ 102.6 * 10^8) Now, we can use the Rydberg equation to solve for n2. After plugging in all the numbers, you will get n2=3.
- Sun Oct 20, 2019 6:25 pm
- Forum: Properties of Light
- Topic: Question 1A.15
- Replies: 5
- Views: 273
Re: Question 1A.15
First, you must recognize that the ultraviolet spectrum of atomic hydrogen is the lyman series and its n1 = 1. Then you use the equation v=c/lambda to calculate v. (v= 2.998 *10^8/ 102.6 * 10^8) Now, we can use the Rydberg equation to solve for n2. After plugging in all the numbers, you will get n2=3.
- Fri Oct 11, 2019 2:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: posting on chemistry community
- Replies: 11
- Views: 769
Re: posting on chemistry community
I have heard from multiple sources the deadline for posting on chemistry community is Sunday! So you have all weekend to post as well rather than having to post on Friday.
- Fri Oct 11, 2019 2:18 pm
- Forum: Student Social/Study Group
- Topic: Best Sessions
- Replies: 12
- Views: 498
Re: Best Sessions
I recommend doing all the homework problems and attempting to work them out on your own, then visiting a TA's office hours where you can ask specific questions you had on the homework. I think the more specific your questions are, the better off you are to succeed.
- Fri Oct 11, 2019 2:14 pm
- Forum: SI Units, Unit Conversions
- Topic: Showing work/ rearranging equations
- Replies: 8
- Views: 782
Re: Showing work/ rearranging equations
I was informed that the better you show your work on homework and test equations, the more points a TA can possibly give you on a problem you didn't get the final correct answer. If your work is very clear, they can see where you made your mistake and hopefully give you credit for the parts you did ...
- Fri Oct 11, 2019 2:12 pm
- Forum: DeBroglie Equation
- Topic: When to use DeBroglie Equation
- Replies: 16
- Views: 718
Re: When to use DeBroglie Equation
You can use DeBroglie's equation to find the wavelength of anything but light because light does not have mass.
- Mon Oct 07, 2019 10:04 pm
- Forum: Limiting Reactant Calculations
- Topic: Need help on question M.9 for chem 14a
- Replies: 6
- Views: 5288
Re: Need help on question M.9 for chem 14a
Thank you so much! I was very confused on this question and you explained it so well. I now see that you must first discover which reactant is the limiting reactant and then the problem becomes much more simple.
- Thu Oct 03, 2019 3:55 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 6
- Views: 391
Re: Sig Figs
32,000,000 has two sig figs. However, if there were to be a decimal point placed at the end of the number (ex/ 32,000,000.) then there would be 8 sig figs 0.3200 has 4 sig figs because the leading zero is not significant. 3.0200 has 5 sig figs. any time there is a trailing zero of final zero after a...
- Thu Oct 03, 2019 3:44 pm
- Forum: Balancing Chemical Reactions
- Topic: State Symbols
- Replies: 5
- Views: 358
Re: State Symbols
Yes, when writing chemical formulas you are suppose to include all the states of matter!
- Thu Oct 03, 2019 3:43 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula units vs molecule
- Replies: 7
- Views: 377
Re: Formula units vs molecule
A formula unit can be thought of as the empirical formula for an ionic compound. For example, NaCL is the formula unit for sodium chloride.
- Wed Oct 02, 2019 10:30 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting reactant
- Replies: 4
- Views: 253
Re: Limiting reactant
The limiting reactant is not necessary the reactant with the least amount of moles, but it could be. When thinking about limiting reactant problems, it has always helped me to compare it to baking cookies. For example, to make one batch of cookies, you need 1 cup of butter and 3 cups of flour. Now i...
- Wed Oct 02, 2019 10:21 pm
- Forum: Significant Figures
- Topic: When to apply sig figs?
- Replies: 4
- Views: 344
Re: When to apply sig figs?
I agree with what everyone else has answered. Sig figs should only be applied to your final answer, this way your final answer can be the most accurate. If you were to apply sig figs to every calculation, you would be doing a lot of unnecessary rounding that could change the final answer pretty sign...