Search found 44 matches
- Sun Dec 13, 2020 10:38 am
- Forum: Naming
- Topic: Ligand use -ate
- Replies: 18
- Views: 915
Ligand use -ate
when do we put -ate at the end of naming a ligand?
- Sun Dec 13, 2020 9:56 am
- Forum: SI Units, Unit Conversions
- Topic: Avogadro's Number
- Replies: 12
- Views: 2084
Re: Avogadro's Number
divide by Avogadro's # when going from moles -> atoms/molecules
multiply by Avogadro's # when going from atoms/molecules -> moles
multiply by Avogadro's # when going from atoms/molecules -> moles
- Sat Dec 12, 2020 10:00 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: weak acid/base and pH
- Replies: 9
- Views: 646
Re: weak acid/base and pH
As those above have stated, yes. The stronger the acid(towards 0)/base(towards 14) the greater the impact.
- Fri Dec 11, 2020 9:08 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Solving PH/PoH
- Replies: 11
- Views: 1025
Re: Solving PH/PoH
I believe the textbook problems are up for grabs on the final, so I think it's safe to say that they're good practice!
- Tue Dec 08, 2020 7:27 pm
- Forum: Properties of Light
- Topic: Frequency and amplitude
- Replies: 7
- Views: 493
Re: Frequency and amplitude
The frequency and amplitude are independent of each other. Frequency is the cycles per sec and amplitude is how large the wave is. I think if anything they would be inversely related.
- Tue Dec 08, 2020 7:22 pm
- Forum: Properties of Electrons
- Topic: intensity vs energy
- Replies: 29
- Views: 3115
Re: intensity vs energy
hi! I believe an increase in intensity increases the number of photons by terms of the photoelectric effect and will emit more electrons but it doesn't effect the energy.
- Tue Dec 08, 2020 7:05 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: delta V. in. Heisenberg questions
- Replies: 6
- Views: 484
Re: delta V. in. Heisenberg questions
The uncertainty in velocity is the range since its 5 and the uncertainty is +/-5, You would add 5+5=10 minus 5-5=0. 10-0=10, so your deltaV is 10.
- Tue Dec 08, 2020 7:02 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Why do we need this?
- Replies: 5
- Views: 423
Re: Why do we need this?
I think it is because of the concept that they are not independent variables and grants a realistic limit based on the known behavior of an electron and its position.
- Tue Dec 08, 2020 6:39 pm
- Forum: Naming
- Topic: Memorization
- Replies: 4
- Views: 275
Re: Memorization
There is the ligand chart on Lavelle's website. My TA said we should familiarize ourselves with which are/can be polydentate.
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
- Tue Dec 08, 2020 6:37 pm
- Forum: Naming
- Topic: What if I don't know?
- Replies: 8
- Views: 437
Re: What if I don't know?
here is the ligand naming chart hope this helps!
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
- Mon Dec 07, 2020 2:52 pm
- Forum: Student Social/Study Group
- Topic: Step-up Sessions in Week 10
- Replies: 5
- Views: 351
Re: Step-up Sessions in Week 10
Sorry, I misread your question but I think it will be the topics we are covering this week with acids and bases.
- Mon Dec 07, 2020 2:49 pm
- Forum: Student Social/Study Group
- Topic: Step-up Sessions in Week 10
- Replies: 5
- Views: 351
- Mon Dec 07, 2020 2:46 pm
- Forum: Student Social/Study Group
- Topic: Curve
- Replies: 33
- Views: 2214
Re: Curve
Seeing that there is a chance of an adjustment gives me hope, but no curve has been mentioned by Dr. Lavelle.
- Mon Dec 07, 2020 2:32 pm
- Forum: Student Social/Study Group
- Topic: Calculating grade
- Replies: 24
- Views: 1394
Re: Calculating grade
tholz11 wrote:If we missed a question on sapling is that factored into the grade? As in, do we lose points off our grade?
yes the percentage of completion is the percent of points you get for that homework grade
- Mon Dec 07, 2020 2:29 pm
- Forum: Student Social/Study Group
- Topic: Finals Study Things
- Replies: 27
- Views: 1206
Re: Finals Study Things
You're the best THANK YOU
- Mon Dec 07, 2020 2:15 pm
- Forum: Naming
- Topic: Naming quizlet
- Replies: 41
- Views: 1611
Re: Naming quizlet
Super helpful thank you for sharing!!
- Mon Dec 07, 2020 2:13 pm
- Forum: Naming
- Topic: coordination compounds with aqua
- Replies: 12
- Views: 625
Re: coordination compounds with aqua
hi! both are correct and as the response above says, you will see H2O in the textbook more so than OH2.
- Mon Dec 07, 2020 2:08 pm
- Forum: Naming
- Topic: Naming metals
- Replies: 6
- Views: 308
Re: Naming metals
I believe when naming coordination compounds the metal tends to be last
Re: -ate
As those above me have said, -ate is used when naming a compound with an overall negative charge
- Thu Dec 03, 2020 2:01 pm
- Forum: Student Social/Study Group
- Topic: Big Sad: Midterm 2
- Replies: 86
- Views: 5343
Re: Big Sad: Midterm 2
I'm relieved with everyone's encouragement especially with my grades on the midterm 2 and finding the 50 is a pass. thank you for the bruno mars song!! needed her! ;(
- Wed Dec 02, 2020 1:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: Helpful Video -- Empirical Formula
- Replies: 3
- Views: 371
Re: Helpful Video -- Empirical Formula
Going back through chem community to find this GOLD thank you!! super helpful!
- Wed Dec 02, 2020 1:21 pm
- Forum: Naming
- Topic: Sapling Q1
- Replies: 20
- Views: 861
Re: Sapling Q1
Hi! I believe Cobalt's charge is 3+ instead of 2+ and spelling errors got me, so be sure you're spelling it right when submitting. Hope this helps!
- Wed Dec 02, 2020 1:17 pm
- Forum: Naming
- Topic: order of ligands [ENDORSED]
- Replies: 6
- Views: 382
Re: order of ligands [ENDORSED]
Hi! I believe the second image was a typo of sorts or is written with different rules than we have been taught, so I think it's safe to structure it in the same way the lectures instruct. Hope this helps!
- Wed Dec 02, 2020 1:12 pm
- Forum: Naming
- Topic: Sapling wk 9 question 1
- Replies: 4
- Views: 215
Re: Sapling wk 9 question 1
I have yet to start the homework, but just by looking at your answer I worked backwards to get the formula. [Co(NH3)5Cl]Cl. The Cl inside and outside both have a -1 charge, and ammine has no charge. Adding the two -1 charges from the chlorine ions would make a -2 total charge, but since everything ...
- Wed Dec 02, 2020 1:08 pm
- Forum: Naming
- Topic: Oxidation State
- Replies: 16
- Views: 597
Re: Oxidation State
Hi! the oxidation state is also called the oxidation number and is the total number of electrons that an atom gains or loses to form a chemical bond. Hope this helps!
- Wed Dec 02, 2020 1:03 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to find Oxidation Numbers
- Replies: 4
- Views: 270
Re: How to find Oxidation Numbers
Hi! I think they are often given to us, but the link in the response is definitely a helpful resource while familiarizing with them.
- Wed Dec 02, 2020 1:00 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: 4 ligands shape
- Replies: 5
- Views: 271
Re: 4 ligands shape
I believe the seesaw shape has a lone pair, where coordination compounds do not have lone pairs making seesaw less common for 4 ligand structure
- Wed Dec 02, 2020 12:57 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling week 9 #3
- Replies: 2
- Views: 131
Re: Sapling week 9 #3
Juwon Lim 3N wrote:A hexagonal planar does have a coordination number of 6. However, the question asks for the geometries that are common for compounds that have a coordination number of 6. Hexagonal planar is very very rare, while octahedrals are much more common.
that makes sense thank you!
- Wed Dec 02, 2020 12:55 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charges on Metals
- Replies: 3
- Views: 245
Re: Charges on Metals
Since the cyanide ion CN has a -1 charge, the (CN)2 would have a -2 charge and Ag can only carry a unipositive charge (+1) making the compound have a -1 charge inside the brackets. Continuing with the Na (+1), that makes the compound without an exterior charge. So, to find those charges, we use the ...
- Wed Dec 02, 2020 12:44 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling Week 9 HW Question 2
- Replies: 11
- Views: 558
Re: Sapling Week 9 HW Question 2
Like the other responses said, the coordination number is the number of bonds to the central transition metal and this number can be found inside the brackets. In this case, there are 4 Br bonded to the transition metal, so the coordination number is 4.
- Wed Dec 02, 2020 12:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling week 9 #3
- Replies: 2
- Views: 131
Sapling week 9 #3
Hi,
Can someone explain how hexagonal planar does not have a coordination number of 6?
Can someone explain how hexagonal planar does not have a coordination number of 6?
- Sun Nov 15, 2020 11:48 pm
- Forum: Coordinate Covalent Bonds
- Topic: Lone Pairs and Lewis Bases
- Replies: 4
- Views: 253
Re: Lone Pairs and Lewis Bases
Lewis bases tend to have lone pairs and can "donate" to compounds that are Lewis acids or "accepters" of electrons.
- Sun Nov 15, 2020 11:42 pm
- Forum: Electronegativity
- Topic: determining electronegativity
- Replies: 40
- Views: 5389
Re: determining electronegativity
I believe we've learned the trends of electronegativity of elements on the periodic table. (those closer to reaching octet by gaining electrons on the right vs those on the left)
- Sun Nov 15, 2020 11:37 pm
- Forum: Electronegativity
- Topic: Periodic Table Trends
- Replies: 9
- Views: 550
Re: Periodic Table Trends
Here are the things we've learned so far: Left to right of the periodic table: - ionization energy increases - electronegativity increases -electron affinity increases -atomic radius decreases Top to bottom: - atomic radius increases Bottom left: - more bottom left, the more metallic it is Top righ...
- Sun Nov 15, 2020 11:33 pm
- Forum: Electronegativity
- Topic: Sapling #14
- Replies: 10
- Views: 389
Re: Sapling #14
Since H bonds happen between Hydrogen and F, O, or N, we use the context of the problem to concur O must be on either side of the H.
- Sun Nov 15, 2020 11:25 pm
- Forum: Electronegativity
- Topic: Sapling #15
- Replies: 11
- Views: 517
Re: Sapling #15
Hydrogen bonding is possible in water when hydrogen is bonded with Nitrogen, Oxygen, Fluorine.
- Sun Nov 15, 2020 11:21 pm
- Forum: Lewis Structures
- Topic: Sapling 9
- Replies: 8
- Views: 351
Re: Sapling 9
Best via formal charge is the one with formal charge closest to 0. And concerning bond length in regards to the sample question, average the lengths of those given in the question and the one closest to the overall length is your best choice.
- Sun Nov 01, 2020 9:47 pm
- Forum: Trends in The Periodic Table
- Topic: positive and negative ion
- Replies: 14
- Views: 571
positive and negative ion
Is the radius of the element larger or smaller when it has a positive or negative ion?
- Sun Nov 01, 2020 9:44 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: ml(cursive)
- Replies: 3
- Views: 170
ml(cursive)
how do I change the number of electrons concerning the orbital being ml=-1?
- Sun Nov 01, 2020 2:12 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: wavelength
- Replies: 13
- Views: 534
wavelength
can a wavelength be negative?
- Sun Nov 01, 2020 2:00 pm
- Forum: Properties of Light
- Topic: spectral lines
- Replies: 6
- Views: 278
spectral lines
When solving for wavelength of emitted electromagnetic radiation, does the initial n level go as n1 or n2 in the equation "R*(1/n^2"1"-1/n^2"2")?
- Sun Nov 01, 2020 1:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Participation Points [ENDORSED]
- Replies: 62
- Views: 3267
Re: Participation Points [ENDORSED]
SophiaJenny1J wrote:Hi! On this general note, do the five posts per week get tallied up on Sunday nights or Friday nights of each week? Thanks!
Sunday nights
- Fri Oct 09, 2020 3:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 6496
Re: Step Up Sessions
How do I register or join a step up session online?
- Fri Oct 09, 2020 1:36 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 32840
Re: All students read this sig fig post [ENDORSED]
When submitting an answer online on sapling, what is the format for sig figs? Do I need to change it to have "x 10^_"?