Search found 36 matches

by AniP_3B
Sat Nov 16, 2019 12:47 pm
Forum: Dipole Moments
Topic: London forces
Replies: 9
Views: 33

Re: London forces

They are considered universal because every molecule, polar or non-polar, has London Dispersion Forces. However, it is important to know that London Dispersion Forces are the most prominent intermolecular force in non-polar molecules.
by AniP_3B
Sat Nov 16, 2019 12:42 pm
Forum: Dipole Moments
Topic: CH
Replies: 3
Views: 18

Re: CH

Anytime a C atom bonds with an H atom (C2H2, CH6, C10H5, etc.), know that it is always non-polar and that there are no dipole moments.
by AniP_3B
Sat Nov 16, 2019 12:38 pm
Forum: Dipole Moments
Topic: Hydrogen bonds
Replies: 17
Views: 41

Re: Hydrogen bonds

Hydrogen bonds can only be formed when H bonds with F, O, or N.
by AniP_3B
Sat Nov 16, 2019 12:37 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 12
Views: 54

Re: Polarity

Another tip is that if the atoms around the central atom are not the same (ex. CH3F), then the molecule is very likely to be polar.
by AniP_3B
Sat Nov 16, 2019 12:31 pm
Forum: Dipole Moments
Topic: Hydrogen Bond
Replies: 7
Views: 34

Re: Hydrogen Bond

A hydrogen bond is a type of dipole-dipole interaction found amongst polar molecules. It is very strong, meaning that molecules that have hydrogen bonds have a high boiling point. Hydrogen bonds can only occur when an H atom bonds with either a F, O, or N atom.
by AniP_3B
Sat Nov 16, 2019 12:29 pm
Forum: Dipole Moments
Topic: Dipole-Dipole vs. Dipole-Induced Dipole
Replies: 3
Views: 14

Dipole-Dipole vs. Dipole-Induced Dipole

What is the difference between a dipole-dipole force versus a dipole-induced dipole force?
by AniP_3B
Sun Nov 10, 2019 12:47 pm
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 11
Views: 68

Re: octet exceptions

C, N, O, F, and Ne are the main elements that must follow the octet rule. There are elements like hydrogen that only need two and those like boron that need 6. Also any element past phosphorus can hold more than 8 electrons.
by AniP_3B
Fri Nov 08, 2019 11:26 am
Forum: Lewis Structures
Topic: Exceptions to Octet Rule
Replies: 7
Views: 21

Re: Exceptions to Octet Rule

Yes, elements Phosphorus and onward can hold more than 8 electrons in their shell and thus can exceed the octet rule.
by AniP_3B
Fri Nov 08, 2019 11:24 am
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 73

Re: central atom

Yes, when drawing a lewis structure, the optimal structure will have a central atom with formal charge 0. It would be ideal for all of the atoms to have a formal charge of 0, but since this is not always possible your main concern should be to make the central atom have a formal charge of 0.
by AniP_3B
Fri Nov 08, 2019 11:21 am
Forum: Octet Exceptions
Topic: Why can't Aluminum have an expanded octet?
Replies: 3
Views: 33

Re: Why can't Aluminum have an expanded octet?

Al can not have an expanded octet because only elements Phosphorus and onward can have more than 8 electrons. However, Al is one the exceptions to the octet rule in the case that it can have less than 8 electrons.
by AniP_3B
Fri Nov 08, 2019 11:18 am
Forum: Electronegativity
Topic: Determining Electronegativity
Replies: 4
Views: 39

Re: Determining Electronegativity

The less electronegative a compound is, the more ionic it will be. When looking at the periodic table, you can confirm that Cl is more electronegative than Br, meaning that SiCl is more electronegative. With this information, you can determine that SiBr is more ionic than SiCl.
by AniP_3B
Sat Nov 02, 2019 10:25 am
Forum: Quantum Numbers and The H-Atom
Topic: determining the number of orbitals
Replies: 7
Views: 50

Re: determining the number of orbitals

You would use m(l) to determine the number of orbitals. For example, if you were given n=2 and l=1, the m(l) would be -1,0,1 which tells you that there are 3 orbitals.
by AniP_3B
Sat Nov 02, 2019 10:15 am
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 5
Views: 35

Re: Octet Exception

Any element past Phosphorus (including P) are an exception to the octet rule and can hold more than 8 electrons.
by AniP_3B
Sat Nov 02, 2019 10:11 am
Forum: Lewis Structures
Topic: central atom
Replies: 16
Views: 84

Re: central atom

The least electronegative atom is the central atom when drawing Lewis structures.
by AniP_3B
Sat Nov 02, 2019 10:08 am
Forum: Formal Charge and Oxidation Numbers
Topic: Minimizing Formal Charges
Replies: 5
Views: 39

Re: Minimizing Formal Charges

In the scenario you just described, it would be best to have 3 formal charges of 0 and one +1. When trying to draw the most stable lewis structure, you want the formal charge of the atoms to be as close to 0 as possible.
by AniP_3B
Tue Oct 29, 2019 12:30 pm
Forum: Lewis Structures
Topic: Homework problem 2C.3
Replies: 5
Views: 37

Re: Homework problem 2C.3

For now, I don't think we're expected to know the formulas.
by AniP_3B
Tue Oct 29, 2019 12:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW Question 2A5
Replies: 3
Views: 29

Re: HW Question 2A5

Cu is one of two exceptions when it comes to electron configurations (the other is Cr), so its electron configuration is [Ar]3d^10 4s^1. So when you subtract an electron due to the positive charge in part a, you would end up with the electron configuration [Ar]3d^10 since you subtracted the electron...
by AniP_3B
Tue Oct 29, 2019 12:04 pm
Forum: Resonance Structures
Topic: stability
Replies: 2
Views: 25

Re: stability

Usually with different resonance structures, there are different formal charges. A formal charge of 0 means that the molecule is most stable so you want to draw the resonance structure that will give you a formal charge of 0, making it the most stable.
by AniP_3B
Sat Oct 26, 2019 11:49 am
Forum: Quantum Numbers and The H-Atom
Topic: Magnetic Quantum Number
Replies: 5
Views: 30

Re: Magnetic Quantum Number

You would have to write out all 5 values instead of just saying 5.
by AniP_3B
Sat Oct 26, 2019 11:47 am
Forum: Quantum Numbers and The H-Atom
Topic: 1D.19
Replies: 3
Views: 22

Re: 1D.19

To determine the number of orbitals you would look at ml from l.
by AniP_3B
Sat Oct 26, 2019 11:11 am
Forum: Lewis Structures
Topic: HW question 2B.3
Replies: 2
Views: 25

Re: HW question 2B.3

There needs to be a double bond between Si and the two oxygens because the double bonds allow for the octet rule to be satisfied for Si. If you were to use single bonds, Si would only have 4 electrons when 8 are needed.
by AniP_3B
Fri Oct 18, 2019 11:26 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: hw problem 1D.21
Replies: 2
Views: 23

Re: hw problem 1D.21

The subshell notation is basically the n-value and and the subshell that corresponds to l. If l=0, s is the subshell, l=1 then p, l=2 then d, and l=3 f So for (a) the subshell notation would be 5d and for (b) it would be 1s For orbitals you would just look and see how many possible ml values the cer...
by AniP_3B
Fri Oct 18, 2019 11:13 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework 1D. 23
Replies: 2
Views: 21

Re: Homework 1D. 23

(a) a is 3 orbitals because the possible outcomes for ml are -1, 0, 1 (b) b is only 1 orbital because the value of ml is already given to you. Since only 1 value of ml is given (ml=-2), there is only 1 orbital (c) for n=2, the possible l values are 0 and 1. The possible ml values for l=0 are ml=0 an...
by AniP_3B
Fri Oct 18, 2019 11:05 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin State
Replies: 6
Views: 37

Spin State

Can someone please explain the concept of a spin state? I am having trouble understanding what a spin state is and what it means in regards to the orbital. Thank you.
by AniP_3B
Fri Oct 18, 2019 11:02 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum number n, l, m
Replies: 13
Views: 72

Re: quantum number n, l, m

n is the principal quantum number and it tells you what shell the electron is in l is the angular momentum quantum number and it describes shape. l=0,1,2,...n-1 Depending on what your l is you can determine whether your electron is in the s, p, d, or f orbital ml is the magnetic quantum number and i...
by AniP_3B
Fri Oct 18, 2019 10:29 am
Forum: Properties of Light
Topic: 1A.9 Energy of Photon
Replies: 12
Views: 68

Re: 1A.9 Energy of Photon

You would use Energy=(Planck's constant)*(frequency) to find the energy of the photon. If you do not have the value of frequency, you would use speed of light=(wavelength)*(frequency) to find frequency and then plug it into the equation for energy.
by AniP_3B
Fri Oct 11, 2019 7:03 pm
Forum: Einstein Equation
Topic: Units
Replies: 17
Views: 577

Re: Units

Kelvin Chung 1C wrote:Do we need to know the SI unit equivalents for each term, like the joule?


I am not sure if you need to know them, but for the quantum section it would extremely helpful to know that a J is equal to kg*m^2*s^-2
by AniP_3B
Fri Oct 11, 2019 6:45 pm
Forum: Empirical & Molecular Formulas
Topic: empirical = molecular?
Replies: 15
Views: 103

Re: empirical = molecular?

If the molecular formula can no longer be simplified, then it is viewed as both the molecular and empirical formula.
by AniP_3B
Fri Oct 11, 2019 6:42 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals M.5
Replies: 3
Views: 44

Re: Fundamentals M.5

You would use the amount of moles of the limiting reactant to find the amount of moles used of the excess reactant using the stoichiometric coefficients of the balanced chemical equation. Once you find out how many moles of the excess have been used, you can then subtract that amount from the amount...
by AniP_3B
Fri Oct 11, 2019 6:34 pm
Forum: Properties of Light
Topic: Homework Question 1A.7
Replies: 2
Views: 15

Re: Homework Question 1A.7

It is a typo as the correct answer is 150 pm.
by AniP_3B
Fri Oct 11, 2019 6:23 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 8
Views: 58

Re: E=hv

h represents Planck's constant, which is 6.626*10^-34 J*s
by AniP_3B
Sat Oct 05, 2019 12:47 pm
Forum: Significant Figures
Topic: Sig Fig Addition and Subtraction
Replies: 5
Views: 58

Re: Sig Fig Addition and Subtraction

Usually what I do when I'm adding/subtracting or multiplying/dividing, and the result is too long of a number to write down fully, is to just round the answer to 2 digits more than the amount of sig figs needed and then when I reach the final answer I will then round to the amount of sig figs needed.
by AniP_3B
Sat Oct 05, 2019 12:32 pm
Forum: Significant Figures
Topic: Sig Figs given in problem vs solution
Replies: 3
Views: 26

Re: Sig Figs given in problem vs solution

Yes, you should and if you are presented with values that have a different amount of sig figs, remember to use the same amount of sig figs as the value that has the least amount of sig figs for your final answer.
by AniP_3B
Sat Oct 05, 2019 11:35 am
Forum: Significant Figures
Topic: Sig Figs
Replies: 3
Views: 19

Re: Sig Figs

When you are trying to determine the amount of sig figs to use when carrying out tasks such as addition/subtraction or multiplication/division, the rule is to use the same amount of sig figs as the number with the least amount of sig figs presented in the problem.
by AniP_3B
Sat Oct 05, 2019 11:31 am
Forum: Significant Figures
Topic: Sig Figs in % Yield
Replies: 10
Views: 93

Re: Sig Figs in % Yield

Usually when you are given a decimal that is .5 or higher, you would round up to the next whole number.
by AniP_3B
Sat Oct 05, 2019 11:20 am
Forum: Significant Figures
Topic: Rules for Significant Figures
Replies: 4
Views: 64

Re: Rules for Significant Figures

There are a few rules that one must take into consideration when dealing with significant figures. 1. Any number that is not zero is considered significant. 2. Zeros are only considered significant if they are between two significant figures (any non-zero number). 3. Also, zeros that are placed afte...

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