Search found 39 matches

by Lesly Lopez 3K
Mon Nov 30, 2020 6:03 pm
Forum: Naming
Topic: Ferrate v Iron
Replies: 7
Views: 28

Re: Ferrate v Iron

Hi,

Yeah Dr. L said that we should not worry much about it since we did not go much into depth but just in case you really want to know I believe ferrate will always be used. From my understanding some metals, iron being one of them, use Latin names, as someone mentioned above.
by Lesly Lopez 3K
Mon Nov 30, 2020 10:49 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Number of Bonds for a TM
Replies: 4
Views: 20

Re: Number of Bonds for a TM

Hello, This is an interesting question. To be completely honest, I am not sure. However, I think you should be okay if you are able to figure out how the ligands bond to the TM for each complex. the concept itself is not hard but the answer to your questions is interesting. Hope someone can answer it.
by Lesly Lopez 3K
Mon Nov 30, 2020 10:46 am
Forum: Naming
Topic: Using ido or o
Replies: 20
Views: 55

Re: Using ido or o

Hi!

They are both correct but in this class I think that we would be using -o much more than the other option.
by Lesly Lopez 3K
Mon Nov 30, 2020 10:33 am
Forum: Resonance Structures
Topic: finding resonance structures
Replies: 4
Views: 13

Re: finding resonance structures

Hi! This is a hard concept for me too because I feel like I can never do it right lol. I draw the one that is the best and then from there I simply try to make either double or triple bonds. Still, you have to keep in mind that some of them will not be the most stable or even plausible. Make sure yo...
by Lesly Lopez 3K
Mon Nov 30, 2020 9:29 am
Forum: Bond Lengths & Energies
Topic: London Dispersion Forces
Replies: 5
Views: 18

Re: London Dispersion Forces

Hi!
Having more bonds does make the London Dispersion Forces stronger of the molecule stronger. Even though LDF's are the weakest, when stacked upon each other they have great strength. Hope tis helps.
by Lesly Lopez 3K
Fri Nov 20, 2020 1:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR notation
Replies: 9
Views: 20

Re: VSEPR notation

It can since it tells you how it is formed. The theory says that repulsion among the pairs of electrons on a central atom (whether bonding or non-bonding electron pairs) will control the geometry of the molecule. Hope that helps!
by Lesly Lopez 3K
Fri Nov 20, 2020 1:54 pm
Forum: Ionic & Covalent Bonds
Topic: Which is strongest bond
Replies: 9
Views: 84

Re: Which is strongest bond

The way I understood this was that since F is the largest element(look at the periodic table and follow the atomic radius trend), it would have a greater atomic radius. It will require a greater bond length from the end of the atom to the other atoms. However, since the length is greater the bond wo...
by Lesly Lopez 3K
Fri Nov 20, 2020 1:51 pm
Forum: Ionic & Covalent Bonds
Topic: Polar Bonds
Replies: 16
Views: 46

Re: Polar Bonds

Hi, The way I do it is to look at the differences in electronegativity between the atoms on the periodic table. When the atoms with a large difference in electronegativity compared to each other then this will create a dipole moment. This is what will cause the molecules to be polar. The large diffe...
by Lesly Lopez 3K
Sun Nov 15, 2020 4:52 pm
Forum: Resonance Structures
Topic: Sapling Week 6 Number 9
Replies: 5
Views: 42

Re: Sapling Week 6 Number 9

later in this problem it asks us for the oxidation number of chlorine, how do we find this? Hi, the sum of the oxidation numbers of the atoms in ion must equal the charge on the ion, -1. When oxygen is bonded to a nonmetal other than F, it has an oxidation number of -2. This is since there are four...
by Lesly Lopez 3K
Sun Nov 15, 2020 4:47 pm
Forum: Resonance Structures
Topic: Sapling #4
Replies: 6
Views: 34

Re: Sapling #4

Hi, so one possible resonance structure is by changing one of the C-O to a double bond and make the double bond C-O single bond. This means that the -1 formal charge will be on the other O atom than in the picture on the question. That would be one resonance structure. The other resonance would have...
by Lesly Lopez 3K
Sun Nov 15, 2020 4:38 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Sapling week 5 & 6 #5
Replies: 20
Views: 66

Re: Sapling week 5 & 6 #5

Hi, The formal charges on the atoms should add up to zero because the HCNO molecule is neutral. The most stable structure has the fewest number of, and smallest magnitude of, formal charges, and with the negative formal charges on the more electronegative elements. Both resonance structures B and C ...
by Lesly Lopez 3K
Sun Nov 15, 2020 4:32 pm
Forum: Dipole Moments
Topic: London (dispersion) forces
Replies: 4
Views: 24

Re: London (dispersion) forces

Hi! These London dispersion forces are often found in the halogens (e.g., F2 and I2), the noble gases (e.g., Ne and Ar), and in other non-polar molecules, such as carbon dioxide and methane. As long as there is no polarization between the atoms in the compound then you should be fine. London forces ...
by Lesly Lopez 3K
Sun Nov 15, 2020 4:28 pm
Forum: Lewis Structures
Topic: Lewis acids and Bases
Replies: 20
Views: 75

Re: Lewis acids and Bases

Hi, You draw the Lewis structure and look for a pair of electrons that can form a bond to another atom. A Lewis base is a molecule or ion that can donate a pair of electrons to form a bond. An atom, ion, or molecule with a lone-pair of electrons can be a Lewis base. I like to draw out my compounds t...
by Lesly Lopez 3K
Sun Nov 08, 2020 8:45 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 142
Views: 486

Re: Favorite TV shows

Omg this is an amazing thread! So far I loved New Girl, Supernatural, The Office, and Friends. I am currently watching Criminal Minds and so that is what I am up to right now. Have a great week you guys.
by Lesly Lopez 3K
Sun Nov 08, 2020 8:43 pm
Forum: Resonance Structures
Topic: Lewis Structure
Replies: 5
Views: 19

Re: Lewis Structure

Hi! There are multiple ways to represent a formula using lewis structures. As long as the atom with the highest electronegativity is the one with the formal charge that is not zero it is okay to have an atom with a formal charge. The whole point is to make sure that most of the atoms do have a forma...
by Lesly Lopez 3K
Fri Nov 06, 2020 6:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Highly Distorted Electrons
Replies: 3
Views: 31

Re: Highly Distorted Electrons

Hi! I understood that, electron distortion is what you call when electrons of the anion are then attracted to the cation. This causes the shape of the electron density to have a slight change. For ionic bonds, the most straightforward concept we tend to think of is a bond where the more electronegat...
by Lesly Lopez 3K
Fri Nov 06, 2020 6:50 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent bond character
Replies: 3
Views: 32

Re: Covalent bond character

Hi! From what I understood, electron distortion is what you call when electrons of the anion are then attracted to the cation. This causes the shape of the electron density to have a slight change. For ionic bonds, the most straightforward concept we tend to think of is a bond where the more electro...
by Lesly Lopez 3K
Mon Nov 02, 2020 9:33 am
Forum: Einstein Equation
Topic: Sapling Q. 6
Replies: 7
Views: 86

Re: Sapling Q. 6

I cannot figure out how to determine the number of spectral for question #6? Is there a different formula to use other than En=-hR/n^2 or DeltaE=Ef-Ei? Hi, for that it is simply 5. Reason being you got form 6-1, 6-2, 6-3, 6-4, and 6-5. Or the other way around. In that case there are just 5 spectral...
by Lesly Lopez 3K
Mon Nov 02, 2020 9:21 am
Forum: DeBroglie Equation
Topic: sapling hw problem
Replies: 5
Views: 98

Re: sapling hw problem

Hi! always try to look back at the reference sheet. I was having trouble too until Someone told me it was on the reference sheet. All the masses are there in units of kg.
by Lesly Lopez 3K
Thu Oct 29, 2020 4:28 pm
Forum: DeBroglie Equation
Topic: sapling hw problem
Replies: 5
Views: 98

Re: sapling hw problem

nayha a 1L wrote:Can someone explain to me how we find the value for m? What would we plug in there?


Hi there, I am not sure where this number came about but someone in another question on this website said that the mass od an electron was: 9.109 x 10-31 kg. Hope that helps!
by Lesly Lopez 3K
Sat Oct 24, 2020 9:47 am
Forum: Einstein Equation
Topic: Sapling Q. 6
Replies: 7
Views: 86

Re: Sapling Q. 6

I calculated the wl in meters, and you got those right. But you just got the conversion wrong. When converting m to nm, you don't divide by 10^9 (what you did), you multiply the number in meters by 10^9. Intuitively, you should have a bigger number in nm than in m. Hope this resolves it Thank you f...
by Lesly Lopez 3K
Sat Oct 24, 2020 9:46 am
Forum: Einstein Equation
Topic: Sapling Q. 6
Replies: 7
Views: 86

Re: Sapling Q. 6

I think when you tried to convert the wavelength from meter to nm, you didn’t use the correct conversion. 1 nm = 10^{-9} m. So 9.4\cdot 10^{-8} m converted to nm would be 94. Same thing for the second one. 7.46 \cdot 10^{-6} m converted to nm would be 7460 nm. The wavelength range would then be fro...
by Lesly Lopez 3K
Fri Oct 23, 2020 7:37 pm
Forum: Einstein Equation
Topic: Sapling Q. 6
Replies: 7
Views: 86

Sapling Q. 6

Hi guys! I have been having o much trouble with this question. Please help The electron in a hydrogen atom is excited to the n=6 shell and emits electromagnetic radiation when returning to lower energy levels. Determine the number of spectral lines that could appear when this electron returns to the...
by Lesly Lopez 3K
Fri Oct 23, 2020 5:37 pm
Forum: Einstein Equation
Topic: Scratch paper during the exam
Replies: 19
Views: 139

Re: Scratch paper during the exam

It does depend on the TA. There are some that are only willing to give you the back of the periodic table and the formula sheet. However, there are others, like my TA, that said to show him the piece of paper before to make sure there is no previous writing and he will allow us to use that paper. Ei...
by Lesly Lopez 3K
Fri Oct 23, 2020 5:33 pm
Forum: General Science Questions
Topic: Rounding versus truncating
Replies: 3
Views: 37

Re: Rounding versus truncating

Sig figs are important. Remember that the questions for the midterm will be multiple choice and there can be a slight difference between the answer choices. My TA said to round and use the right sig figs because if you don't it might cost you if you choose the wrong answer. But yeah it should be 2.7...
by Lesly Lopez 3K
Wed Oct 21, 2020 5:32 pm
Forum: Photoelectric Effect
Topic: Sappling week 2 problem #6
Replies: 5
Views: 57

Re: Sappling week 2 problem #6

Hi. So, I can only help you with the number of spectral lines because I am also confused about the other to parts. So for the number of spectral lines, it is 5. Reason being, the atom can go from 1-6, 2-6, 3-6, 4-6, and 5-6 (or the there way around). Point is there are 5 ways that the atom can skip ...
by Lesly Lopez 3K
Wed Oct 21, 2020 5:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Constant
Replies: 3
Views: 41

Re: Rydberg Constant

I think that you can use either. Still, when you chose which one you are going to use pay attention to the units. Use the constant that will practically make your life easier in canceling out the units and will allow you to reach your answer faster. Hope that helps!
by Lesly Lopez 3K
Wed Oct 14, 2020 6:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: Sapling Q. 5
Replies: 2
Views: 55

Re: Sapling Q. 5

Hi, I kept getting this question wrong but it turns out that it was just the sig figs that were incorrect! With the question, not us :( The question only gives one value, n=6, so I put both of my final answers with one sig fig, but it counted my second nm answer as incorrect until I input it with 2...
by Lesly Lopez 3K
Wed Oct 14, 2020 5:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Sapling Q. 5
Replies: 2
Views: 55

Sapling Q. 5

Hi everyone! I need help with this question. I feel like it is super simply and I'm just over thinking it. Can you guys help? Thank you!! The electron in a hydrogen atom is excited to the n=6 shell and emits electromagnetic radiation when returning to lower energy levels. Determine the number of spe...
by Lesly Lopez 3K
Wed Oct 14, 2020 3:26 pm
Forum: Student Social/Study Group
Topic: Step Up Sessions
Replies: 9
Views: 81

Re: Step Up Sessions

Hi! Step up sessions are really helpful because you are within a community that is struggling just like you. There is a safe space to ask questions and ask for more help. Drop in sessions are also very helpful when there are individual question you want to ask about anything mostly. You should defin...
by Lesly Lopez 3K
Tue Oct 13, 2020 3:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Series
Replies: 2
Views: 21

Re: Spectral Series

I have a hard time explaining it so I put a URL to a graph that makes this more understandable: https://haygot.s3.amazonaws.com/questions/365508_171741_ans.gif Hope it helps!
by Lesly Lopez 3K
Tue Oct 13, 2020 3:30 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: post module #14
Replies: 5
Views: 50

Re: post module #14

I would have to agree with the our peers. The answer was D. The answer choices are trying to confuse you but that is the only real answer.
by Lesly Lopez 3K
Fri Oct 09, 2020 8:08 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Preference on Scientific Notation
Replies: 11
Views: 96

Re: Preference on Scientific Notation

Hi! I'm guessing that is up to you. Whatever you are more comfortable with writing. They mean the same thing so it should not be an issue. But still, maybe you should go to office hours and ask. Maybe he does have a preference as to how we should write it out.
by Lesly Lopez 3K
Tue Oct 06, 2020 11:48 am
Forum: Limiting Reactant Calculations
Topic: Textbook Question M19)
Replies: 5
Views: 47

Re: Textbook Question M19)

The first step is to determine the masses of carbon and hydrogen in the products like the CO2 and H2O. You do this by converting the 0.682g of CO2 to moles of CO2, then converted the moles of CO2 to moles of C, and the moles of C to grams of C. Then calculated the mass of H by going through these sa...
by Lesly Lopez 3K
Tue Oct 06, 2020 11:29 am
Forum: Significant Figures
Topic: Integers and Sig Figs
Replies: 4
Views: 81

Re: Integers and Sig Figs

So when there is a 'lazy' number like 5 or 12 in the question that we need to do the problem, we do not take it into account for sig figs? It is almost like constants. They are there to do the problem but do not affect the number of sig figs in the outcome.
by Lesly Lopez 3K
Tue Oct 06, 2020 11:26 am
Forum: Limiting Reactant Calculations
Topic: Sapling Homework #10
Replies: 7
Views: 72

Re: Sapling Homework #10

I get what you mean. This problem actually has implications of organic chemistry. The lines represent covalent single bonds between carbon and hydrogen. So if you were to draw the model and add the double covalent bonds of the O for the 2-butanone you could actually add up the molar masses for each ...
by Lesly Lopez 3K
Tue Oct 06, 2020 11:19 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Reactants vs. Reagents
Replies: 5
Views: 49

Re: Reactants vs. Reagents

They are practically synonyms. But if you want to go into further detail, reactants could be known as elements or compounds but no exactly a mixture. Reagents are most of the time mixtures containing one of the reactants and other chemicals present in the equation. Hope that kind of answers your que...
by Lesly Lopez 3K
Tue Oct 06, 2020 11:06 am
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4409

Re: Step Up Sessions

Hi, I understand that these Step-Up sessions are for counseling. Can we just join into the zoom meeting any time during the time slots or must we stay there for the entire time? Also, can we bring in questions about topics or only specific questions for specific problems? I have a feeling I'm going ...

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