Search found 53 matches

by Jade_Tai_2L
Fri Dec 11, 2020 4:50 pm
Forum: Naming
Topic: "ate" and "ic"
Replies: 4
Views: 42

Re: "ate" and "ic"

Lavelle mentioned in his lecture that you use "-ate" with the metal name when the complex has a negative charge. So for example: [Ni(CN)4)] 2- : the name would be tetra cyano nickelATE (II)
by Jade_Tai_2L
Fri Dec 11, 2020 4:47 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 18
Views: 114

Re: Final

Dr. Lavelle has mentioned that he would use textbook problems but with different numbers, so I suggest practicing those.
by Jade_Tai_2L
Fri Dec 11, 2020 4:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligands
Replies: 2
Views: 43

Re: Chelating Ligands

I don't think so-- they won't be able to bind the same atom because the atoms are on opposite sides.
by Jade_Tai_2L
Fri Dec 11, 2020 4:09 pm
Forum: Air Pollution & Acid Rain
Topic: pH of hard water
Replies: 4
Views: 55

Re: pH of hard water

I think hard water is usually alkaline-- do you remember where did Dr. Lavelle mentioned it was acidic? I forgot.
by Jade_Tai_2L
Fri Dec 11, 2020 4:07 pm
Forum: Hybridization
Topic: When is Hybridization used?
Replies: 2
Views: 32

Re: When is Hybridization used?

Hi! if you need any more confirmation, I found this website pretty helpful: https://socratic.org/questions/how-to-t ... -hybridize
by Jade_Tai_2L
Fri Dec 11, 2020 4:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading scale
Replies: 11
Views: 114

Re: Grading scale

I think Dr. Lavelle hasn't determined the grading scale yet? Only that like a 250/500 is like a C- or C+ for now, but I'm not entirely sure.
by Jade_Tai_2L
Fri Dec 11, 2020 4:04 pm
Forum: Industrial Examples
Topic: Chemotherapy
Replies: 18
Views: 382

Re: Chemotherapy

I only remember Dr. Lavelle going over Cisplatin-- do we have to know others?
by Jade_Tai_2L
Fri Dec 11, 2020 2:35 pm
Forum: Electronegativity
Topic: help with a periodic trend problem?
Replies: 3
Views: 46

Re: help with a periodic trend problem?

Does this question have to do with the highly polarizable e-? Like, highly polarizable e- makes the molecule have a more covalent character? (Or am I getting this wrong)
by Jade_Tai_2L
Fri Dec 11, 2020 2:20 pm
Forum: Student Social/Study Group
Topic: Anxiety
Replies: 42
Views: 240

Re: Anxiety

Study for a bit, then take a short break (repeat)! I have bad habits with last minute cramming, but it honestly just gives me more anxiety. I've been trying to go exercise more, since it takes my mind off studying for a bit.
by Jade_Tai_2L
Fri Dec 11, 2020 2:18 pm
Forum: Naming
Topic: Adding 'ion' to the name
Replies: 2
Views: 12

Re: Adding 'ion' to the name

If it has a charge, I think it's a pretty good chance that it's an ion, so we add it the name.
by Jade_Tai_2L
Sun Nov 29, 2020 7:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H20 Shape
Replies: 17
Views: 102

Re: H20 Shape

Simply put, H2O has a lone pair of electrons are on the same side of the molecule, resulting in repulsion. This repulsion of the lone pairs of electrons on the oxygen atom causes the bond of the hydrogen to the oxygen to be pushed “downwards.”
by Jade_Tai_2L
Sun Nov 29, 2020 7:09 pm
Forum: Student Social/Study Group
Topic: Tips for Staying Focused
Replies: 52
Views: 527

Re: Tips for Staying Focused

I’m so bad with distractions, so I started turning off all my notifications/turning my phone on DND. Also, studying for an hour then taking a ten minute break also helps really well instead of completely cramming.
by Jade_Tai_2L
Sun Nov 29, 2020 7:07 pm
Forum: Student Social/Study Group
Topic: Studying for Final Exam
Replies: 57
Views: 372

Re: Studying for Final Exam

Redoing book problems! Also maybe doing some of the UA worksheets, since everyone also really likes those problems as well.
by Jade_Tai_2L
Sun Nov 29, 2020 7:04 pm
Forum: Electronegativity
Topic: Sapling Week 8 Polarity
Replies: 5
Views: 52

Re: Sapling Week 8 Polarity

I kind of had the same thought, but I suppose having polar bonds is correlated with the overall molecule also being polar? Does this mean molecules with polar bonds will always (or more often) be considered as polar overall?
by Jade_Tai_2L
Tue Nov 24, 2020 11:55 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula and Empirical Formula Mass
Replies: 6
Views: 72

Re: Molecular Formula and Empirical Formula Mass

I think the empirical formula is the lowest whole ratio of atoms possible! A molecular formula shouldn't be smaller than the empirical formula, and I don't think non-whole numbers are preferred either (:
by Jade_Tai_2L
Tue Nov 24, 2020 10:33 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 9
Views: 56

Re: Resonance

Resonance occurs when a molecules cannot be expressed by a single lewis structure. You will know if a molecule has resonance structures if it has a lone pair or a double bond on the atom next to a double bond.
by Jade_Tai_2L
Tue Nov 24, 2020 10:27 pm
Forum: Ionic & Covalent Bonds
Topic: More Covalent
Replies: 8
Views: 61

Re: More Covalent

The strength of a covalent bond increases as the number of bonds increase (i.e: in order of decreasing to increasing strength: single bond < double bond < triple bond). If the molecules you're comparing both have the same amount of bonds, you'd refer to the size of the molecule, so the larger the at...
by Jade_Tai_2L
Tue Nov 24, 2020 10:27 pm
Forum: Ionic & Covalent Bonds
Topic: More Covalent
Replies: 8
Views: 61

Re: More Covalent

The strength of a covalent bond increases as the number of bonds increase (i.e: in order of decreasing to increasing strength: single bond < double bond < triple bond). If the molecules you're comparing both have the same amount of bonds, you'd refer to the size of the molecule, so the larger the at...
by Jade_Tai_2L
Tue Nov 24, 2020 10:25 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 10
Views: 72

Re: Octet Exceptions

In Lavelle's lectures, he talked about radicals (compounds w/ unpaired e-) and lewis acids/bases that were exceptions to the octet guideline (lecture 15). with Lewis/base reactions, a coordinate covalent bond will form when another atom provides both e- to the lewis acid molecule.
by Jade_Tai_2L
Tue Nov 24, 2020 10:17 pm
Forum: Ionic & Covalent Bonds
Topic: Differentiating Between Ionic and Covalent
Replies: 3
Views: 24

Re: Differentiating Between Ionic and Covalent

In general, nonmetals will form covalent bonds with nonmetals, and metals will form ionic bonds with nonmetals.
by Jade_Tai_2L
Wed Nov 18, 2020 9:35 pm
Forum: Lewis Structures
Topic: line structures of organic compounds
Replies: 1
Views: 13

Re: line structures of organic compounds

I just saw this as well-- and I don't think we have to know it? I'm not completely sure though-- I don't remember it being in lectures either.
by Jade_Tai_2L
Wed Nov 18, 2020 9:31 pm
Forum: Bond Lengths & Energies
Topic: Comparing Strengths of Interactions Between Ions
Replies: 2
Views: 34

Re: Comparing Strengths of Interactions Between Ions

Hi, When solving this problem, I would first look at the size/charge of the cation and anion respectively. A smaller sized cation with a greater positive charge will lead to stronger ionic character, thus making the answer to this question CAO rather than KCL. This was actually super helpful-- than...
by Jade_Tai_2L
Wed Nov 18, 2020 9:13 pm
Forum: Dipole Moments
Topic: Dipole Dipole Interactions
Replies: 7
Views: 53

Re: Dipole Dipole Interactions

I thought of the nonpolar molecules as the ones consisting of non-metal atoms (which therefore, yes, Br2, H2, F2 would be nonpolar). I never really thought about the small electronegativity differences and if that factored in as well. Hopefully someone answers this :')
by Jade_Tai_2L
Wed Nov 18, 2020 9:08 pm
Forum: Dipole Moments
Topic: Dipole vs Polar molecule
Replies: 2
Views: 15

Re: Dipole vs Polar molecule

I think they're interchangeable-- a dipole is a result of a polar molecule with polar bonds I believe? I may be wrong.
by Jade_Tai_2L
Fri Nov 13, 2020 11:24 pm
Forum: Bond Lengths & Energies
Topic: Covalent Bond Length
Replies: 13
Views: 133

Re: Covalent Bond Length

I'm not sure about others, but I believe bond length is determined by the # of bonded electrons? So the higher the bond order, the stronger the pull and the shorter the bond length. So bond length increases from triple bond < double bond < single bond
by Jade_Tai_2L
Fri Nov 13, 2020 11:19 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: is it polar
Replies: 6
Views: 80

Re: is it polar

Hi! We can tell if a molecule is polar if one atom is more electronegative than the other. A simple example is H2O, where Oxygen has a partial negative charge and the Hydrogens have partial positive charges. This website helps a lot with explaining assigning charges for dipole moments as well (: htt...
by Jade_Tai_2L
Fri Nov 13, 2020 11:16 pm
Forum: Dipole Moments
Topic: Interaction potential energy
Replies: 2
Views: 22

Re: Interaction potential energy

I think it's because energy always needs to be put into a system in order for like charges to be brought closer together.
by Jade_Tai_2L
Fri Nov 13, 2020 11:07 pm
Forum: Resonance Structures
Topic: Resonance hybrid of molecules
Replies: 2
Views: 25

Re: Resonance hybrid of molecules

A resonance hybrid is a combination of all possible resonance structures (and resonance structures exist when a single Lewis structure cannot full describe a molecules binding). A molecule can have resonance when it has a lone pair or a double bond on the atom next to a double bond, and the overall ...
by Jade_Tai_2L
Sun Nov 08, 2020 11:53 pm
Forum: Octet Exceptions
Topic: specific exceptions
Replies: 3
Views: 11

Re: specific exceptions

I think we'll be able to tell if we do the configurations and doing configurations might be a good way to double check! I'm not sure if there's any we need to know off the top of our heads
by Jade_Tai_2L
Sun Nov 08, 2020 11:49 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Importance of anions and cations
Replies: 15
Views: 89

Re: Importance of anions and cations

An easy way to remember is ca(+)ion is positive and anion is the opposite (:
by Jade_Tai_2L
Sun Nov 08, 2020 11:47 pm
Forum: Lewis Structures
Topic: Sapling Homework 7
Replies: 3
Views: 18

Re: Sapling Homework 7

A Lewis base is any species that can donate a pair of electrons, and a Lewis acid is any species that can accept a pair of electrons. So atoms, ions, or molecules with a lone-pair of electrons can be a Lewis base I believe. Please correct me if I'm wrong!
by Jade_Tai_2L
Sun Nov 08, 2020 11:43 pm
Forum: Ionic & Covalent Bonds
Topic: Oxidation number
Replies: 7
Views: 43

Re: Oxidation number

This website provides some practice problems too after some explanations (: hopefully this helps!
http://chemed.chem.purdue.edu/genchem/t ... xnumb.html
by Jade_Tai_2L
Sun Nov 01, 2020 1:13 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Unusual Electron Configuration
Replies: 3
Views: 47

Re: Unusual Electron Configuration

There was a similar question posted about this, and someone explained that (in, for example Ag) the 5s orbital will get filled prior to the 4d orbital, but in some cases the 4d orbital is more stable w/ 10 e- instead of 9, so it may take an electron from the 5s orbital. Hopefully this makes sense, a...
by Jade_Tai_2L
Sun Nov 01, 2020 1:10 am
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 88
Views: 457

Re: Is c always the speed of light?

All we need to know for this class is that c=speed of light= 3.0x10^8
by Jade_Tai_2L
Sun Nov 01, 2020 1:01 am
Forum: Properties of Light
Topic: Midterm
Replies: 6
Views: 72

Re: Midterm

I think one of the UA's mentioned that Lavelle doesn't really curve his exams, but I'm not sure about this one. He mentioned partial credit, but it's also unsure about how they're going to be given (if they will be) because of the exam being MC.
by Jade_Tai_2L
Sun Nov 01, 2020 12:59 am
Forum: Trends in The Periodic Table
Topic: Sapling HW #30
Replies: 6
Views: 64

Re: Sapling HW #30

Simply put, I like to think of it as Rb- gaining an e- so it's negative, and if it gains an e- then the radius will be larger. Rb+ lost an electron and is positive, so the radius will be smaller.
by Jade_Tai_2L
Sun Nov 01, 2020 12:58 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals and Electrons
Replies: 9
Views: 40

Re: Orbitals and Electrons

The Pauli Exclusion Principle-- there are only two possible spins, so only 2 electrons can be in an orbital
by Jade_Tai_2L
Sun Oct 25, 2020 10:55 am
Forum: Properties of Electrons
Topic: Number of Questions of Midterm 1
Replies: 8
Views: 82

Re: Number of Questions of Midterm 1

I think someone said they weren't too sure because it's up to Lavelle, but there shouldn't be too many questions because of the time limit and some questions will be longer than others.
by Jade_Tai_2L
Sun Oct 25, 2020 10:46 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: P-, d-, f- Orbitals
Replies: 5
Views: 46

Re: P-, d-, f- Orbitals

The wave function Ψ^2 represents the probability of finding electron density. So in p-, d-, and f- orbitals, there's places in the orbital where there's 0 probability of having electron density. If you watch his lecture again and look at the diagrams he showed, you can see areas on the orbitals wher...
by Jade_Tai_2L
Sun Oct 25, 2020 10:32 am
Forum: Photoelectric Effect
Topic: unit conversion hw Q 1.3
Replies: 7
Views: 238

Re: unit conversion hw Q 1.3

Convert the units before computing the equation. You'll know when to convert if the constant units you're using in the equation are set, and the given numbers in the problem are different. ie: speed: m.s-1, wavelength given in problem: nm
by Jade_Tai_2L
Sun Oct 25, 2020 10:22 am
Forum: Properties of Electrons
Topic: intensity vs energy
Replies: 29
Views: 254

Re: intensity vs energy

An increase in intensity is an increase in particles, while an increase in energy is an increase in frequency. Think of it as more intense = throwing more balls at a target.
by Jade_Tai_2L
Sat Oct 17, 2020 9:26 am
Forum: Electronegativity
Topic: periodic table
Replies: 16
Views: 128

Re: periodic table

electronegativity: increases from left to right across a period of elements. decreases from top to bottom down a group. ionization energy: increases from left to right. electron affinity: increases from left to right. generally decreases down a group of elements atomic radius: increases down a group...
by Jade_Tai_2L
Sat Oct 17, 2020 9:13 am
Forum: Significant Figures
Topic: Sig Figs and Constants on Exams
Replies: 9
Views: 104

Re: Sig Figs and Constants on Exams

You should probably use the full length of the constants listed, but use the correct sigfigs depending on the rest of the problem, just to make sure that your answer is closer to what Dr. Lavelle has as the answer.
by Jade_Tai_2L
Fri Oct 16, 2020 1:00 pm
Forum: Properties of Electrons
Topic: Electrons Excited or Ejected
Replies: 19
Views: 142

Re: Electrons Excited or Ejected

Electrons are excited by the photoelectric effect--the energy supplied exceeds the work function then the electron is ejected with KE = hf - phi. Otherwise, it goes to a higher orbital and then falls to a lower orbital, which releases energy. Ejection only occurs when the work function is exceeded I...
by Jade_Tai_2L
Fri Oct 16, 2020 12:43 pm
Forum: Properties of Light
Topic: bohr frequency condition
Replies: 4
Views: 65

Re: bohr frequency condition

Bohr's frequency condition is ΔE=hv, meaning the difference in energy (when a high energy e- drops to a lower energy e- level) is equal to Planck's constant x frequency. (lmk if this is wrong! I'm not completely sure myself)
by Jade_Tai_2L
Fri Oct 16, 2020 12:29 pm
Forum: Properties of Electrons
Topic: Bound vs. Free Electrons
Replies: 6
Views: 58

Re: Bound vs. Free Electrons

I think free electrons are at a higher energy state than bound electrons are? free electrons aren't bounded to atoms, whereas bounded electrons are bounded to the nucleus I believe (please correct me if I'm wrong!)
by Jade_Tai_2L
Wed Oct 07, 2020 1:20 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling Week 1 HW_problem #7
Replies: 5
Views: 61

Re: Sapling Week 1 HW_problem #7

Yes, this is how I did the problem as well!
by Jade_Tai_2L
Wed Oct 07, 2020 1:15 pm
Forum: Limiting Reactant Calculations
Topic: Sapling Question #10
Replies: 9
Views: 132

Re: Sapling Question #10

I ended up with the same answer but never got 72.1 g/mol for 2 butanone and am not sure where everyone is getting that calculation? Is that just from getting the molecular formula and then determining the molar mass? I actually just googled the molar mass of butanone :') I'm not sure if we were sup...
by Jade_Tai_2L
Tue Oct 06, 2020 11:55 pm
Forum: Molarity, Solutions, Dilutions
Topic: #25 on Molarity and Dilution of a Solution Post Assessment
Replies: 6
Views: 72

Re: #25 on Molarity and Dilution of a Solution Post Assessment

I did this post assessment module a few days ago but if I remember correctly I got it right using these steps: Convert the 5.00 g KMnO4 to mols using its molar mass (158.04g/mol) and you'll get 0.0316 mol. Then using the volume you're given, find the molarity of the solution. Make sure to change th...
by Jade_Tai_2L
Tue Oct 06, 2020 11:46 pm
Forum: Limiting Reactant Calculations
Topic: Sapling Question #10
Replies: 9
Views: 132

Re: Sapling Question #10

I ended up with the same answer but never got 72.1 g/mol for 2 butanone and am not sure where everyone is getting that calculation? Is that just from getting the molecular formula and then determining the molar mass? I actually just googled the molar mass of butanone :') I'm not sure if we were sup...
by Jade_Tai_2L
Tue Oct 06, 2020 11:41 pm
Forum: Empirical & Molecular Formulas
Topic: M19: oxygen
Replies: 4
Views: 49

Re: M19: oxygen

Is it perhaps because in the way you calculated the moles "2(0.0155) + 2(0.0097) = 0.0504 mol O?," the 2(0.0097) is just supposed to be (0.0097)? I think I understand that you multiplied the (0.0155) by 2 because there are 2 Oxygen atoms to one Carbon atom in CO2, but in H2O, there's 1 Oxy...
by Jade_Tai_2L
Tue Oct 06, 2020 11:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: #25 on Molarity and Dilution of a Solution Post Assessment
Replies: 6
Views: 72

Re: #25 on Molarity and Dilution of a Solution Post Assessment

Step 1. Covert 5.00g KMnO4 to moles: 5.00g *(1mol/158.04g) = 0.0316 mol KMnO4 Step 2. Covert 150.00 mL to L: 0.150 L Step 3. Using the M1V1=M2V2 formula, the 20.00 ml (0.02L) will be your V1, the 250.00 ml (0.250 L) is V2 Step 4. M1 will be calculated from step 1 and 2: (0.0316 mol/0.150L) = 0.211M ...
by Jade_Tai_2L
Mon Oct 05, 2020 4:01 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Question
Replies: 7
Views: 104

Re: Molarity Question

Step 1. Covert 5.00g KMnO4 to moles: 5.00g *(1mol/158.04g) = 0.0316 mol KMnO4 Step 2. Covert 150.00 mL to L: 0.150 L Step 3. Using the M1V1=M2V2 formula, the 20.00 ml (0.02L) will be your V1, the 250.00 ml (0.250 L) is V2 Step 4. M1 will be calculated from step 1 and 2: (0.0316 mol/0.150L) = 0.211M ...

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