Search found 100 matches
- Sat Mar 13, 2021 3:08 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and Cathode
- Replies: 25
- Views: 1387
Re: Anode and Cathode
yes, the anode is always oxidizing and the cathode is always reduced
- Sat Mar 13, 2021 3:07 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook 6N.23
- Replies: 6
- Views: 412
Re: Textbook 6N.23
I agree that we need metals with a lower reduction potential as they would work better
- Sat Mar 13, 2021 3:03 am
- Forum: Zero Order Reactions
- Topic: kind of reaction
- Replies: 25
- Views: 1219
Re: kind of reaction
it means that we need no reactant, and we would have a 0 poewr exponent because the ratio of the two (if calculating this way) would be equal to one
- Sat Mar 13, 2021 3:02 am
- Forum: Zero Order Reactions
- Topic: Half life
- Replies: 19
- Views: 1003
Re: Half life
we use the equation specifically for half life for zero order reactions! which is the equation everyone else has stated
- Sat Mar 13, 2021 2:54 am
- Forum: Zero Order Reactions
- Topic: When to use each order
- Replies: 19
- Views: 1157
Re: When to use each order
like everyone else said, you look at the sum of the rate law exponents!
- Sat Mar 13, 2021 2:52 am
- Forum: Second Order Reactions
- Topic: Sapling #12 Week9/10
- Replies: 7
- Views: 546
Re: Sapling #12 Week9/10
you can figure it out by looking at how the half life changes related to molarity, and then look at the half life equations and find which one fits the proportions of molarity related to the time of the half life
- Sat Mar 13, 2021 2:42 am
- Forum: Second Order Reactions
- Topic: Determining slow step
- Replies: 22
- Views: 1215
Re: Determining slow step
The slow step should have the highest activation energy, and you would also find the products of the slow step in the final reaction!
- Sat Mar 13, 2021 2:22 am
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 578058
Re: Saying Thank You to Dr. Lavelle
Dear Dr. Lavelle, Thank you so much for teaching us for 2 quarters (14a and b) especially during quarantine! Thank you for putting in so much effort recording lecture videos and making them really enjoyable and happy during this time. The transition to online learning has been hard, but you've made ...
- Sat Mar 13, 2021 1:55 am
- Forum: First Order Reactions
- Topic: Sapling #11 week 9/10
- Replies: 5
- Views: 474
Re: Sapling #11 week 9/10
i agree with above statements! It states in the question that it's a first order reaction, so we take the equation for a half life first order reaction.
- Sat Mar 13, 2021 1:35 am
- Forum: First Order Reactions
- Topic: Sapling Week 9/10 #13
- Replies: 6
- Views: 475
Re: Sapling Week 9/10 #13
because we're looking at the slow reaction, we use that one and then replace hclo with the equation from the first as it's an intermediate product!
- Sun Feb 28, 2021 11:27 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling Week 7/8 #7 ion movement
- Replies: 6
- Views: 327
Re: Sapling Week 7/8 #7 ion movement
potassium just helps with the concentration and pH of the solution to help with ion movement i believe
- Sun Feb 28, 2021 10:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling # 9
- Replies: 2
- Views: 248
Re: Sapling # 9
i agree with the person above! you half reaction sshould be Zn2+(aq) + 2e– → Zn(s) and Au3+(aq) + 3e– → Au(s), which you can then use to calculate the E value
- Sun Feb 28, 2021 10:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anodes and Cathodes
- Replies: 22
- Views: 1057
Re: Anodes and Cathodes
anodes are for oxidized substances while cathodes are generally for reduced substances; as the person above said~
- Sun Feb 28, 2021 10:22 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode/Cathode
- Replies: 45
- Views: 1626
Re: Anode/Cathode
the anode is always on the left and the cathode is always on the right!
- Sun Feb 28, 2021 10:16 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: -d[R]/dT versus d[P]/dt
- Replies: 13
- Views: 934
Re: -d[R]/dT versus d[P]/dt
these two would have the same values if the number of moles were the same!
- Mon Feb 22, 2021 1:36 am
- Forum: Balancing Redox Reactions
- Topic: "Leo" Oxidation Numbers
- Replies: 26
- Views: 1171
Re: "Leo" Oxidation Numbers
leo is just for substances that are oxidized, it doesn't mean anything beyond that!
- Mon Feb 22, 2021 1:30 am
- Forum: Balancing Redox Reactions
- Topic: Oxygen
- Replies: 12
- Views: 712
Re: Oxygen
it would be 0 alone, but -2 in another compound!
- Mon Feb 22, 2021 1:27 am
- Forum: Balancing Redox Reactions
- Topic: Oxidizing vs Reducing
- Replies: 55
- Views: 2674
Re: Oxidizing vs Reducing
I use oil rig! (oxidation is lost and reduction is gained) and like the comments above lavelle also uses leo the lion goes grr (which I don't use as much)
- Mon Feb 22, 2021 1:25 am
- Forum: Balancing Redox Reactions
- Topic: coefficients for oxidation number
- Replies: 22
- Views: 4987
Re: coefficients for oxidation number
the coefficient doesn't matter because it doesn't affect the oxidation numbers for the elements
- Mon Feb 22, 2021 1:23 am
- Forum: Balancing Redox Reactions
- Topic: Sapling Week 7/8 #1
- Replies: 10
- Views: 2069
Re: Sapling Week 7/8 #1
you should first look at the oxidation numbers of all the parts!
- Mon Feb 15, 2021 12:48 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sapling #6
- Replies: 6
- Views: 391
Re: Sapling #6
You have to find the change in entropy of both the volume and pressure, and then add them together, (making sure to keep the signs in check!)
- Mon Feb 15, 2021 12:47 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Determining the Sign of S
- Replies: 8
- Views: 471
Re: Determining the Sign of S
you generally solve it through the equation, but it's good to check first based on concept whether or not it changes due to an increase or decrease in entropy
- Mon Feb 15, 2021 12:46 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: confusion with notation
- Replies: 11
- Views: 566
Re: confusion with notation
d is for derivatives and delta is always for change!
- Sun Feb 07, 2021 5:15 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling #19
- Replies: 7
- Views: 368
Re: Sapling #19
^^sorry to add on you don't use the neutralization reaction at all, so it's not something to worry about!
- Sun Feb 07, 2021 5:14 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling #19
- Replies: 7
- Views: 368
Re: Sapling #19
all you do is calculate the specific heat of the calorimeter and then plug that in to find the q of the second
- Sun Feb 07, 2021 5:11 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling Homework #20
- Replies: 6
- Views: 392
Re: Sapling Homework #20
you first find q with nCdeltaT and then you use the equation delta E/U = w+ q
- Sun Feb 07, 2021 5:04 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Cp and Cv
- Replies: 7
- Views: 443
Re: Cp and Cv
also the reverse is true, which is Cv=Cp-R which is what you use in the sapling question!
- Sun Feb 07, 2021 4:59 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling Week 5 Number 18
- Replies: 5
- Views: 311
Re: Sapling Week 5 Number 18
The equation for delta u is the same except you use cv instead of cp
- Sun Feb 07, 2021 4:29 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling #20 Linear vs. nonlinear molecules
- Replies: 13
- Views: 602
Re: Sapling #20 Linear vs. nonlinear molecules
Yea it just looks at VESPR structure and drawing out the molecule would help determine if it's linear or not
- Sun Feb 07, 2021 4:29 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: HW 3/4 Problem 10
- Replies: 3
- Views: 258
Re: HW 3/4 Problem 10
The setup looks good, it's probably just the temperature difference mentioned above^
- Sun Feb 07, 2021 4:27 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Wks 3 & 4 Sapling Q18
- Replies: 6
- Views: 383
Re: Wks 3 & 4 Sapling Q18
I don't think it was mentioned in lecture either (at least not the ones associated with this homework), but Lavelle did mention the difference between Cp and Cv when he first explained them in Lecture 9, and I just assume that means we should probably know this formula. It's also the one used in the...
- Sun Feb 07, 2021 4:24 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling #14
- Replies: 6
- Views: 371
Re: Sapling #14
Because it stated that it was an ideal gas, we first find the number of moles of the gas with the ideal gas law!
- Sun Feb 07, 2021 4:23 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: HW Question
- Replies: 4
- Views: 465
Re: HW Question
Also, check to make sure yours is CO2, mine was NO2 so I used the nonlinear ratio!
- Sun Feb 07, 2021 4:21 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling Question 18
- Replies: 1
- Views: 282
Re: Sapling Question 18
Delta U can also be calculated with the equation: ΔU=nCVΔT
Essentially you solve it the same way, but you would change Cp to Cv (constant volume molar specific heat). I don't know if it was mentioned in lecture, but I looked it up for this question and Cp and Cv are related with the equation Cv=Cp-R
Essentially you solve it the same way, but you would change Cp to Cv (constant volume molar specific heat). I don't know if it was mentioned in lecture, but I looked it up for this question and Cp and Cv are related with the equation Cv=Cp-R
- Sun Feb 07, 2021 4:15 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling 20
- Replies: 10
- Views: 478
Re: Sapling 20
I agree that I solved it using the equation people talked about above, and my answer to both parts were the same because delta E = w + q, but in this case we don't have work because the volume stays constant so you just solve for q
- Sun Jan 24, 2021 12:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: hw question #5
- Replies: 2
- Views: 186
Re: hw question #5
you have to add 0.000018 and 0.32 i'm pretty sure because both of those numbers would be part of the initial molarity. So it would be 0.000018/0.000018 + 0.32
- Sun Jan 24, 2021 12:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pKa and Ka
- Replies: 27
- Views: 1017
Re: pKa and Ka
pKa is the negative log of Ka!
- Sun Jan 24, 2021 12:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating equilibrium concentrations
- Replies: 3
- Views: 227
Re: Calculating equilibrium concentrations
he said less than 10^-4 during lecture you can ignore the bottom x, and like the person said above, once you check the ionization/deprotonated species % that also has to be less than 5% once you ignore 10^-4
- Sun Jan 24, 2021 12:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 36
- Views: 1946
Re: ICE Tables
it's based off the coefficients!
- Sun Jan 24, 2021 12:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: percent ionization
- Replies: 6
- Views: 264
Re: percent ionization
Percent ionization is the calculated x value (A-) divided by the initial molarity (AH) x 100%
- Mon Jan 18, 2021 12:58 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units to know
- Replies: 11
- Views: 574
Re: Units to know
we mainly need to know atm and torr!
- Mon Jan 18, 2021 12:56 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Week 1 #5
- Replies: 8
- Views: 601
Re: Sapling Week 1 #5
you multiply them to add them together!
- Mon Jan 18, 2021 12:56 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Week 1 Sapling 10
- Replies: 8
- Views: 449
Re: Week 1 Sapling 10
sapling gives everyone different values, but we're graded on completion so you should always try your answer if you think you solved it!
- Mon Jan 18, 2021 12:51 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: quadratic formula values
- Replies: 13
- Views: 744
Re: quadratic formula values
even though both are positive, only one should make sense given the conditions of the question
- Mon Jan 18, 2021 12:49 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: equilibrium shifts: left of right?
- Replies: 13
- Views: 721
Re: equilibrium shifts: left of right?
it would shift right because according to the equilibrium there would now be too much reactant and it shifts to the products in order to achieve equilibrium again
- Sun Jan 10, 2021 11:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: change in K
- Replies: 22
- Views: 933
Re: change in K
k is only affected by temperature!
- Sun Jan 10, 2021 11:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling HW 1 #5
- Replies: 8
- Views: 529
Re: Sapling HW 1 #5
make sure to factor/remember to use inverse reactions for these types of questions! It was something I forgot about when I first did it too
- Sun Jan 10, 2021 10:58 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K Favors Products or Reactants
- Replies: 20
- Views: 673
Re: K Favors Products or Reactants
A large k value is anything over 10^3 and a small value would be anything lower than 10^-3!
- Sun Jan 10, 2021 10:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units
- Replies: 27
- Views: 1011
Re: Units
should be bars and atm for units that we've seen so far!
- Sun Jan 10, 2021 10:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concentration vs Pressure
- Replies: 9
- Views: 593
Re: Concentration vs Pressure
for the questions that we've discussed, I think that they mean the same thing for calculations (though it'll get harder and we'd need to know the difference later)
- Wed Dec 16, 2020 2:16 pm
- Forum: Lewis Acids & Bases
- Topic: Acids & Bases
- Replies: 9
- Views: 814
Re: Acids & Bases
you should look at what accepts/loses an electron/proton and that will tell you which ones act as an acid or base! You could also memorize certain patterns like how anything that starts with h is generally an acid and anything ending with oh is usually a base (and the group 1 and group 2 patterns)
- Wed Dec 16, 2020 2:15 pm
- Forum: Lewis Acids & Bases
- Topic: Ligands
- Replies: 6
- Views: 499
Re: Ligands
a ligand is just a lewis base (donates electrons) to a metal usually to form a coordinate compound
- Wed Dec 16, 2020 2:13 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis vs Bronsted
- Replies: 20
- Views: 1222
Re: Lewis vs Bronsted
lewis acids/bases focus on electrons, while bronsted focuses on the transfer of h+ ions
- Wed Dec 16, 2020 2:12 pm
- Forum: Einstein Equation
- Topic: units for E=hv
- Replies: 21
- Views: 1201
Re: units for E=hv
I think it's normally j/photon, but you would check with the question to make sure because sometimes it can change to j/atom
- Wed Dec 16, 2020 2:11 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: paired and parallel
- Replies: 10
- Views: 1193
Re: paired and parallel
paired electrons and parallel spin are different! paired electrons are the 2 that would be in the ml orbital with opposite spins (-1/2 and 1/2) and parallel electrons are ones that have the same spin meaning they're definitely not paired
- Mon Dec 07, 2020 4:11 pm
- Forum: Electronegativity
- Topic: Acidity
- Replies: 4
- Views: 435
Re: Acidity
the more electronegative an atom is the stronger acid it'll be generally
- Mon Dec 07, 2020 4:00 pm
- Forum: Lewis Acids & Bases
- Topic: Acids vs Basis
- Replies: 11
- Views: 677
Re: Acids vs Basis
I agree with a lot of the responses mentioning that you most likely have to look at the definitions of what you want but a rule of thumb would be to look at the H and OH groups at the ends of the compound
- Mon Dec 07, 2020 3:53 pm
- Forum: Lewis Acids & Bases
- Topic: Water
- Replies: 63
- Views: 3027
Re: Water
it can act as either depending on the question and the other compounds
- Mon Dec 07, 2020 3:50 pm
- Forum: Lewis Acids & Bases
- Topic: sapling #6
- Replies: 19
- Views: 970
Re: sapling #6
the carboxyl groups shows that it's an acid!
- Sun Dec 06, 2020 2:40 am
- Forum: Naming
- Topic: what does (en) mean?
- Replies: 23
- Views: 10511
Re: what does (en) mean?
do you guys know if we'll need to know this by memory for this class/series? wondering if it's something I should look at before the exam in case it shows up
- Sun Dec 06, 2020 2:38 am
- Forum: Ionic & Covalent Bonds
- Topic: lone pairs -polar molecule
- Replies: 15
- Views: 1336
Re: lone pairs -polar molecule
I would definitely first look at the bond angles, because not every molecule with lone pairs would be polar as they could be evenly spaced from each other
- Sun Dec 06, 2020 2:36 am
- Forum: Properties of Light
- Topic: Is c always the speed of light?
- Replies: 92
- Views: 5876
Re: Is c always the speed of light?
for this class c is always the constant value for speed of light!
- Sun Dec 06, 2020 2:34 am
- Forum: Significant Figures
- Topic: When should I start looking at sig figs?
- Replies: 31
- Views: 1623
Re: When should I start looking at sig figs?
My ta mentioned that you would get the best answer by being as exact during calculations and rounding at the end only for the best/safest results
- Sat Dec 05, 2020 7:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.13 Part D, Determining the bond angle of N2O
- Replies: 5
- Views: 562
Re: 2E.13 Part D, Determining the bond angle of N2O
definitely should be 180! I checked my textbook and it says 180 if that helps
- Sat Dec 05, 2020 7:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: difference
- Replies: 4
- Views: 270
Re: difference
they have different amounts of electron dense areas - trigonal planar has 3 electron dense (paired) areas while t-shaped has 5 electron dense areas while 2 are lone pairs (aka there should be a different amount of electrons on the molecule that will help you tell)
- Mon Nov 23, 2020 9:49 pm
- Forum: Lewis Structures
- Topic: Dot stucture
- Replies: 11
- Views: 570
Re: Dot stucture
You would first count the valence electrons and then create the dot structure around it based on bonds that you need to create and lone pairs
- Mon Nov 23, 2020 9:46 pm
- Forum: Lewis Structures
- Topic: Week 8 Sapling Homework #13
- Replies: 7
- Views: 777
Re: Week 8 Sapling Homework #13
I would just focus on each one individually, as the structures of each tend to be self-explanatory. If the overall structure affects it, I would focus on that after looking at each individual carbon
- Mon Nov 23, 2020 9:35 pm
- Forum: Lewis Structures
- Topic: Lewis acids and Bases
- Replies: 20
- Views: 883
Re: Lewis acids and Bases
lewis acids are compounds/elements that accept electrons, and bases will donate electrons. acids and bases donate/accept in lone pairs, so it's a matter of seeing which ones can donate a lone pair or give one up.
- Mon Nov 23, 2020 9:30 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 17
- Views: 1185
Re: Octet Rule
like lavelle said in lecture, I feel like it's important to note that the "normal" elements we use generally follow the trend, but any element that has access to the d orbital past period 3 can generally overcome the octet rule
- Mon Nov 23, 2020 9:18 pm
- Forum: Properties of Electrons
- Topic: intensity vs energy
- Replies: 29
- Views: 3393
Re: intensity vs energy
it should be false because intensity is based on how many photons there are, while energy is focused on the individual photon!
- Sun Nov 15, 2020 8:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework due date
- Replies: 49
- Views: 2371
Re: Homework due date
the homework is due tonight! it's always the same time as chem community too~ :)
- Sun Nov 15, 2020 8:26 pm
- Forum: Dipole Moments
- Topic: hydrogen bonding and ice
- Replies: 4
- Views: 176
Re: hydrogen bonding and ice
with ice it forms a lattice structure that actually makes the structure have less density, because water is more dense in liquid form as it flows freely and forms/reforms bonds while in ice all the molecules are structured
- Sun Nov 15, 2020 8:23 pm
- Forum: Dipole Moments
- Topic: Sapling #13
- Replies: 9
- Views: 607
Re: Sapling #13
you locate the amount of N,O,and F atoms that a hydrogen bond can form, and then you check how many lone pairs each one of these have for a hydrogen bond to form with!
- Sun Nov 15, 2020 8:20 pm
- Forum: Dipole Moments
- Topic: H-Bond acceptor
- Replies: 9
- Views: 456
Re: H-Bond acceptor
it doesn't need to be attached to a hydrogen, but you need ot make sure there's a partial charge on the molecule that it's attached to, which is why in the sapling homework it generally can't attach to a carbon that has 4 bonds (because it becomes nonpolar)
- Sun Nov 15, 2020 8:13 pm
- Forum: Dipole Moments
- Topic: Sapling W 5/6 #17
- Replies: 10
- Views: 555
Re: Sapling W 5/6 #17
I think it's really helpful to draw out the structure because LD forces can only be used with nonpolar molecules, so drawing out the structures generally gives you an idea of how they should work, besides a few exceptions
- Mon Nov 09, 2020 2:01 am
- Forum: Student Social/Study Group
- Topic: Midterm 2 Study Group
- Replies: 25
- Views: 1141
Re: Midterm 2 Study Group
thank you for organizing this! hope we all do well :')
- Mon Nov 09, 2020 1:59 am
- Forum: Ionic & Covalent Bonds
- Topic: Size of Bonds
- Replies: 28
- Views: 916
Re: Size of Bonds
double bonds hold electrons together more closely, which is shown as it takes more to break a double bond over a single bond. Because they're more tightly bound, they tend to be smaller
- Mon Nov 09, 2020 1:58 am
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 16
- Views: 1067
Re: Electronegativity
flourine only needs one electron, which means that it has a high electronegativity as it doesn't need a lot of electrons to fill it's outer shell
- Mon Nov 09, 2020 1:57 am
- Forum: Ionic & Covalent Bonds
- Topic: Sulfate
- Replies: 8
- Views: 250
Re: Sulfate
sulfate/sulfur can have expanded d- orbitals; I'm not entirely sure why it happens, but because it has something to do with the d-orbitals elements in the second period can't have expanded octets, which is why sulfur is an example
- Mon Nov 09, 2020 1:54 am
- Forum: Ionic & Covalent Bonds
- Topic: Difference Between Ionic & Covalent Bonds
- Replies: 11
- Views: 486
Re: Difference Between Ionic & Covalent Bonds
covalent bonds generally share electrons in a pair, while ionic bonds generally result in ionization where one atom donates electrons to another
- Sun Nov 01, 2020 9:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Sampling 28
- Replies: 10
- Views: 301
Re: Sampling 28
the max l value is always one less than the n value, and you can tell what it's in by the orbital that's stated. s=0, p=1, d=2, f=3 and so on
- Sun Nov 01, 2020 9:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: intermolecular vs intramolecular
- Replies: 17
- Views: 1972
Re: intermolecular vs intramolecular
Do we need to know how to identify intramolecular forces? I'm pretty sure there are only 3 intramolecular forces (ionic, covalent, and metallic bonding) and it's not too hard to remember so I would just make sure to know the difference between the two. Intramolecular forces are bonds because it all...
- Sun Nov 01, 2020 9:15 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 10
- Views: 655
Re: Electronegativity
electronegativity is how much an electron is drawn to an atom, and we can see the trends on a periodic table (as we probably won't have to know specific electronegativity numbers for this class)
- Sun Nov 01, 2020 9:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: hydrogen
- Replies: 19
- Views: 989
Re: hydrogen
N, O, and F have the strongest attraction to a hydrogen because they are all really close to their octet, and it was mentioned that in most of the time we would see hydrogen primarily bind to these elements
- Sun Nov 01, 2020 9:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Is ionic or covalent stronger?
- Replies: 31
- Views: 16789
Re: Is ionic or covalent stronger?
I'm pretty sure ionic bonds are stronger for this class, but as comments above have said, it seems that covalent bonds are stronger for chemistry
- Sun Oct 25, 2020 7:42 pm
- Forum: SI Units, Unit Conversions
- Topic: units to know for midterm
- Replies: 11
- Views: 818
Re: units to know for midterm
does anyone know if we just use the equation sheet from his website, or will he email another sheet out? I remember someone telling me that their TA said Lavelle would email one for us to print for this test specifically
- Sun Oct 25, 2020 7:41 pm
- Forum: SI Units, Unit Conversions
- Topic: Can someone explain Avogrado's #?
- Replies: 8
- Views: 969
Re: Can someone explain Avogrado's #?
Avogadro's number is just a set number of anything, and we then assign to units to it based on what we're looking at. Essentially it's like the number 10 or 5, and we assign units to this number to represent what it is (i.e. molecules of water, eggs, test questions, etc.)
- Sun Oct 25, 2020 7:36 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity and Electronegativity
- Replies: 9
- Views: 467
Re: Electron Affinity and Electronegativity
Hi this is probably another dumb question but why does electron affinity increase as we go up and to the right? I understand how electronegativity goes up but not affinity
- Sun Oct 25, 2020 7:32 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 6
- Views: 342
Re: Orbitals
it's always n-1, and I'm sure where in lecture he stated that, but it should only be for the 0 and 1 orbitals, and not the second!
- Sun Oct 25, 2020 7:28 pm
- Forum: *Shrodinger Equation
- Topic: Sapling Number 6
- Replies: 3
- Views: 182
Re: Sapling Number 6
everything seems right, so you should probably check the parenthesis of your calculator like the last person said! I've found that adding extra parenthesis is always better (better safe than sorry) and just as a trick you only really need the first parenthesis and you don't need to work on closing i...
- Sun Oct 18, 2020 3:31 pm
- Forum: Properties of Light
- Topic: Energy Levels
- Replies: 11
- Views: 619
Re: Energy Levels
I think that the levels are more of a concept to help us understand electrons, and as previous posts above have stated with the uncertainty principle, electrons probably travel without stopping to levels as they "jump", as an electron is only in one space for a split second. There's probab...
- Sun Oct 18, 2020 3:23 pm
- Forum: Properties of Electrons
- Topic: protons and electrons
- Replies: 33
- Views: 2685
Re: protons and electrons
electrons have negligible mass and are mostly there for the charge/energy, which is when we use them for calculations! Protons and neutrons are around the same mass and are larger than electrons
- Sun Oct 18, 2020 3:20 pm
- Forum: Properties of Electrons
- Topic: Grading System
- Replies: 7
- Views: 419
Re: Grading System
from people i've talked to the getting a 50% is a c- until like 73% and then it's a normal grading scale
- Sun Oct 18, 2020 3:11 pm
- Forum: Student Social/Study Group
- Topic: How are you studying?
- Replies: 204
- Views: 21920
Re: How are you studying?
I'm taking notes/outlining the lectures and sample problems bc they're really useful for understanding the concepts first! I've been doing sapling problems for hw after and then reviewing a few textbook questions on subjects I'm struggling in! I think that starting from the lectures and working your...
- Sun Oct 18, 2020 2:49 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Reactions Order
- Replies: 49
- Views: 6580
Re: Balancing Chemical Reactions Order
There isn't one way to do it, but I definitely find it easier to first try to balance out a molecule that has only one product with it on the right side because by attempting to balance it, a lot of the times the rest of the numbers will balance each other out through trial and error!
- Sat Oct 10, 2020 4:03 pm
- Forum: Limiting Reactant Calculations
- Topic: Actual yield
- Replies: 20
- Views: 914
Re: Actual yield
Actual yield should be able to be calculated given certain information from the problem, though the questions that we've done so far mostly have them given. I think that in the future we might get questions that ask us to calculate both given idealized information but I think all the questions this ...
- Sat Oct 10, 2020 3:57 pm
- Forum: Significant Figures
- Topic: How many significant figures are in 7.00 x 10^2?
- Replies: 25
- Views: 3623
Re: How many significant figures are in 7.00 x 10^2?
There would be 3 sig figs on this because it specified 7.00 and all trailing zeros behind a decimal are significant. If the question had written 700 it would probably be one though, so I'm fairly certain it's based on how the question is worded.
- Wed Oct 07, 2020 4:20 pm
- Forum: Empirical & Molecular Formulas
- Topic: Rounding EF to Integers
- Replies: 6
- Views: 348
Re: Rounding EF to Integers
If you're using molecular mass, you should get the empirical formula already in it's simplest state without decimals after calculating. You'll use whole numbers for the molecular formula too, so I think that even if you were to somehow get decimals it would be easier to work with whole numbers for t...
- Wed Oct 07, 2020 4:16 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: precision for molar masses
- Replies: 14
- Views: 525
Re: precision for molar masses
what I did on the homework problem was round the really close ones like oxygen (15.999) and selenium (78.96), but like ones that don't round as well I keep to one decimal point. I've gotten all the right answers with sig figs according to the textbook, so it's what I've been doing since it works.
- Wed Oct 07, 2020 4:09 pm
- Forum: Significant Figures
- Topic: Clarification on Significant Figures
- Replies: 9
- Views: 465
Re: Clarification on Significant Figures
The person who posted above is right! And I'm also kind of rusty on sig figs but I'm pretty sure 0.340 has 3 sig figs, because the sig fig rule is that trailing zeroes to the right of the decimal are significant, so it should count?