Search found 54 matches

by Amir Bayat
Mon Nov 18, 2019 10:18 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 49
Views: 1419

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

For question 2(b) we are asked to determine the hybridization for the carbon atom in HCOOH. How would one solve this?
by Amir Bayat
Mon Nov 18, 2019 10:09 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 49
Views: 1419

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

Could someone please explain how to solve the first problem in Worksheet 6? The problem asks... For the following nitrogen oxide compounds: a. Draw the most stable lewis structure. b. Determine the shape. c. Determine whether the compound is polar or nonpolar. Nitric Oxide (NO) Nitrogen Dioxide ( NO...
by Amir Bayat
Mon Nov 18, 2019 9:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 5
Views: 25

Re: Trigonal Bipyramidal

Yep, electron arrangement is only determined using the # of regions of electron density, while the molecule's shape is determined using the actual number of lone pairs and bond pairs. This means that molecules with different shapes (and different formulas, ex: AX4E for SF4) can have the same electr...
by Amir Bayat
Mon Nov 18, 2019 9:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE formula
Replies: 9
Views: 26

Re: AXE formula

Being the central atom, A, does not have subscripts. We look at the shapes of molecules using the central atom and the atoms that it is bonded to. No shape will have an A with a subscript.
by Amir Bayat
Mon Nov 18, 2019 9:31 pm
Forum: Hybridization
Topic: Stability of bonds
Replies: 3
Views: 18

Stability of bonds

Why is a sigma bond more stable than a pi bond?
by Amir Bayat
Mon Nov 18, 2019 9:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hybridization, Shape, and Electron Density
Replies: 2
Views: 9

Re: Hybridization, Shape, and Electron Density

Or more specifically, the regions of electron density can help determine the number of hybrid orbitals.
by Amir Bayat
Mon Nov 18, 2019 9:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hybridization, Shape, and Electron Density
Replies: 2
Views: 9

Re: Hybridization, Shape, and Electron Density

Correct, the atoms in the molecule determine the shape of it. The regions of electron density help us identify its hybridization.
by Amir Bayat
Mon Nov 18, 2019 9:21 pm
Forum: Hybridization
Topic: Energy in Hybridization
Replies: 3
Views: 16

Energy in Hybridization

In the lecture today, Doctor Lavelle mentioned energy increasing in hybridization. Does the energy of the molecule increase when we hybridize it or is there a required energy input into the molecule required for hybridization to occur?
by Amir Bayat
Mon Nov 18, 2019 9:19 pm
Forum: Hybridization
Topic: Hybridization
Replies: 4
Views: 15

Hybridization

When do we hybridize a molecule? Are all molecules from now on going to contain hybridized bonds?
by Amir Bayat
Wed Nov 13, 2019 10:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: arrangment and strength of IMFS
Replies: 4
Views: 35

Re: arrangment and strength of IMFS

Additionally, molecules with greater surface area allow for stronger intermolecular forces.
by Amir Bayat
Wed Nov 13, 2019 10:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: arrangment and strength of IMFS
Replies: 4
Views: 35

Re: arrangment and strength of IMFS

The arrangement influences how close one atom can get to another atom. The amount of bonds the central atom has also affects how likely it is to interact with other atoms or molecules.
by Amir Bayat
Wed Nov 13, 2019 10:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 2.E.7
Replies: 3
Views: 35

Question 2.E.7

How can you calculate the bond angle values for part (c) of the question? The question is stated below. (a) What is the shape of a thionyl chloride molecule, SOCl2? Sulfur is the central atom. (b) How many different OSCl bond angles are there in this molecule? (c) What values are expected for the OS...
by Amir Bayat
Fri Nov 08, 2019 9:04 am
Forum: Lewis Structures
Topic: Midterm grades
Replies: 26
Views: 145

Re: Midterm grades

Doctor Lavelle said that it would take at least a week to grade the midterms due to the vast amount of students in the class and partial credit grading system.
by Amir Bayat
Fri Nov 08, 2019 9:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar v. Nonpolar
Replies: 11
Views: 268

Re: Polar v. Nonpolar

A trick for finding nonpolar bonds are diatomic molecules. Since the electronegativity difference is zero between two of the same atom, the bonds are nonpolar and the electrons are equally shared between the two atoms.
by Amir Bayat
Fri Nov 08, 2019 9:01 am
Forum: Dipole Moments
Topic: Drawing Unpaired Electrons
Replies: 7
Views: 37

Re: Drawing Unpaired Electrons

Always draw lone pair electrons. Question 2a) did not draw them because all the electrons were properly bonded.
by Amir Bayat
Tue Nov 05, 2019 6:25 pm
Forum: Bond Lengths & Energies
Topic: de Broglie threshold
Replies: 4
Views: 43

de Broglie threshold

At what threshold or maximum value can wavelike properties not be detected anymore?
by Amir Bayat
Tue Nov 05, 2019 6:23 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 20
Views: 1037

Re: De Broglie Wavelength

At what de Broglie wavelength can the wavelike properties be detected?
by Amir Bayat
Sun Nov 03, 2019 9:01 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 49
Views: 1419

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

If a certain frequency of radiation is not ejecting electrons from the surface of a metal, is it possible to eject electrons by increasing the intensity of the incident radiation? How would we solve a question such as the question stated above? Does the intensity refer to the wavelength of the radia...
by Amir Bayat
Sun Nov 03, 2019 11:57 am
Forum: Electronegativity
Topic: Electronegativity Correlations
Replies: 3
Views: 11

Re: Electronegativity Correlations

Correct, the electronegativity increases to the right and up on the Periodic Table - so do ionization energy and electron affinity.
by Amir Bayat
Sun Nov 03, 2019 11:55 am
Forum: Ionic & Covalent Bonds
Topic: Drawing Ionic Compunds
Replies: 7
Views: 28

Re: Drawing Ionic Compunds

Ionic compounds are drawn through their Lewis Structures with a bracket around the entire structure and the charge on the top right corner.
by Amir Bayat
Sun Nov 03, 2019 11:53 am
Forum: Administrative Questions and Class Announcements
Topic: Homework before midterm
Replies: 3
Views: 29

Re: Homework before midterm

Karyn How 1J wrote:For this week’s homework, I would just do it on chemical bonds outline just to be safe since that’s what we are currently learning.


I agree, it would be safer to do some problems from the Chemical Bonds section to turn in.
by Amir Bayat
Sun Nov 03, 2019 11:52 am
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 3
Views: 23

Re: Sigma and Pi Bonds

The Sigma and Pi bonds will not be on the exam. They are chemistry topics that we will learn later on.
by Amir Bayat
Sun Nov 03, 2019 9:49 am
Forum: Bond Lengths & Energies
Topic: Ions for the Midterm
Replies: 3
Views: 25

Ions for the Midterm

Do we need to know ions like those in question 2C for the midterm on Wednesday? The question 2C states: Draw the Lewis structure, including typical contributions to the resonance structure (where appropriate, allow for the possibility of octet expansion, including double bonds in different positions...
by Amir Bayat
Sun Nov 03, 2019 9:47 am
Forum: Bond Lengths & Energies
Topic: Question 2.C.3.c
Replies: 2
Views: 25

Re: Question 2.C.3.c

Thank you
by Amir Bayat
Fri Nov 01, 2019 11:05 pm
Forum: Bond Lengths & Energies
Topic: Question 2.C.3.c
Replies: 2
Views: 25

Question 2.C.3.c

The question 2C states: Draw the Lewis structure, including typical contributions to the resonance structure (where appropriate, allow for the possibility of octet expansion, including double bonds in different positions), for (a) periodate ion; (b) hydrogen phosphate ion; (c) chloric acid; (d) arse...
by Amir Bayat
Fri Nov 01, 2019 10:52 pm
Forum: Bond Lengths & Energies
Topic: Question 2.C.3.b
Replies: 2
Views: 29

Question 2.C.3.b

The question 2C states: Draw the Lewis structure, including typical contributions to the resonance structure (where appropriate, allow for the possibility of octet expansion, including double bonds in different positions), for (a) periodate ion; (b) hydrogen phosphate ion; (c) chloric acid; (d) arse...
by Amir Bayat
Mon Oct 28, 2019 3:20 pm
Forum: Trends in The Periodic Table
Topic: Question 2B.9
Replies: 3
Views: 17

Question 2B.9

For part (b), how do you arrange the potassium atoms around the phosphorous atom for the Lewis Structure Diagram? Do they revolve around the phosphorous atom, or can we arrange them separate from the potassium atom?
by Amir Bayat
Fri Oct 25, 2019 11:43 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds
Replies: 3
Views: 32

Re: Pi bonds

Doctor Lavelle claimed in class that they were electrons that move around, while the atoms do not change position in the Lewis Dot Structure. He also mentioned that we will be going over them later on and they do not pertain right now They are also defined as covalent bonds where two lobes of an orb...
by Amir Bayat
Fri Oct 25, 2019 3:38 pm
Forum: Trends in The Periodic Table
Topic: Stable Structures
Replies: 5
Views: 18

Stable Structures

In class today, Doctor Lavelle talked about how there are different methods in drawing the Lewis Dot Structures for different molecules like sulfate. How do we know, again, which structure is more stable? Is it when the central atom has a formal charge of 0?
by Amir Bayat
Fri Oct 25, 2019 3:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E25
Replies: 1
Views: 14

1E25

For this question and all questions alike, is the notation for the valence-shell configuration the notation that Doctor Lavelle showed in class with the up arrows and down arrows as well, or is it just the orbitals, group numbers, and more like for example 3p^6?
by Amir Bayat
Fri Oct 25, 2019 3:29 pm
Forum: Properties of Electrons
Topic: 1E1
Replies: 2
Views: 25

1E1

Could someone please explain part (a) of this question? Does n increasing pertain to the energy of the atom or the energy of the electron as well?
by Amir Bayat
Fri Oct 25, 2019 3:27 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1.D 25
Replies: 1
Views: 15

Re: 1.D 25

(c) cannot exist in an atom as the g-orbital is not possible with n = 4 as l can only reach up to a maximum of 3. 3 does not pertain to the g-orbital.

(d) is possible as n=6, and thus l = 5. At l = 5, there exists the f - orbital.
by Amir Bayat
Fri Oct 18, 2019 1:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D. Quantum Numbers and Orbitals
Replies: 2
Views: 24

Re: 1D. Quantum Numbers and Orbitals

Since there are two electrons in an orbital, we multiply the orbital by 2 get the total number of electrons in a subshell. a) A p-orbital claims that there are three orbitals, so 2 * 3 = 6 electrons. b) d has 5 orbitals, so 2 *5 = 10 electrons. c) s has 1 orbital, so 2 * 1 = 2 electrons. d) f has 7 ...
by Amir Bayat
Fri Oct 18, 2019 1:03 pm
Forum: Properties of Light
Topic: Black Body Radiation
Replies: 2
Views: 19

Re: Black Body Radiation

Black body radiation claims that as the temperature increases, the wavelength of light decreases.
by Amir Bayat
Fri Oct 18, 2019 1:02 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cr and Cu Exceptions
Replies: 2
Views: 17

Re: Cr and Cu Exceptions

The Cr and Cu are exceptions as they are not stable with the Cr: [Ar] 3d^4 4s^2 and Cu: [Ar] 3d^9 4s^2 orbital equations.

They only need part of the d-suborbital filled to remain stable.
by Amir Bayat
Fri Oct 18, 2019 1:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 4
Views: 20

Re: Rydberg Equation

The Rydberg equation can also be seen in the change in energy formula, where energy initial is subtracted from the energy initial.

The Rydberg equation's purpose is to find the change in energy (noted by Doctor Lavelle to be for an H-atom).
by Amir Bayat
Fri Oct 18, 2019 12:56 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: p- and d- orbitals and zero e- density
Replies: 5
Views: 25

Re: p- and d- orbitals and zero e- density

This statement is accurate, the images online can help clarify this confusion. The symmetry of the orbitals can be seen on the graphs, and it is observed that the s orbital is purely symmetrical while the other orbitals are not. To explain the symmetry aspect (I am confused about the density part as...
by Amir Bayat
Fri Oct 18, 2019 12:49 pm
Forum: Einstein Equation
Topic: HW 1.B.7 (b and c)
Replies: 3
Views: 21

Re: HW 1.B.7 (b and c)

For part (b) we convert the mg of Na to moles of Na and then multiply by Avogadro's number to get the number of atoms of Na. We then multiply by the energy in part (a) to get how much energy is emitted by 5 mg of Na. For part (c) we multiply the energy from part (a) by Avogadro's number to get the l...
by Amir Bayat
Sun Oct 13, 2019 12:44 am
Forum: Properties of Light
Topic: Question 1.A.11
Replies: 1
Views: 19

Question 1.A.11

The question says: In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them together logical? How do you go a...
by Amir Bayat
Sun Oct 13, 2019 12:08 am
Forum: Properties of Light
Topic: Frequency vs. Wavelength
Replies: 15
Views: 72

Re: Frequency vs. Wavelength

The relationship between the two is inversely related. An increase in frequency, means a decrease in wavelength - and vice versa. Frequency measures the amount of waves per cycle and the wavelength measures the distance between each part of the cycle.
by Amir Bayat
Sun Oct 13, 2019 12:05 am
Forum: Properties of Light
Topic: e=hv
Replies: 7
Views: 39

Re: e=hv

This equation was explained in class to be the energy per photon and since light consists of photons, E=hv is applied to light.
by Amir Bayat
Sun Oct 13, 2019 12:03 am
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 785

Re: Speed of Light

The speed of light will not change. It is consistently 3.8 *10^8.
by Amir Bayat
Sun Oct 13, 2019 12:01 am
Forum: Photoelectric Effect
Topic: threshold energy
Replies: 6
Views: 21

Re: threshold energy

Additionally, this may also be due to the number of photons. For instance, the lower the light intensity and lower the frequency of light, the less photons are present. This makes the threshold of energy be determined by a set number of photons.
by Amir Bayat
Sat Oct 12, 2019 11:58 pm
Forum: Photoelectric Effect
Topic: threshold energy
Replies: 6
Views: 21

Re: threshold energy

I believe this is due to the particles not being able to have wavelike properties that are detectable when the De Boigle wavelength is less than 10^-15 m.

However, I am not sure about this and am confused on this topic as well.
by Amir Bayat
Thu Oct 10, 2019 1:27 pm
Forum: Properties of Light
Topic: Question 1.A.3
Replies: 4
Views: 30

Question 1.A.3

The question states: Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. (a) The speed of the radiation decreases. (b) The wavelength of the radiation decreases. (c) The extent of the change in the electrical field at a given point decrea...
by Amir Bayat
Thu Oct 03, 2019 11:35 pm
Forum: SI Units, Unit Conversions
Topic: Sig Fig Mistakes
Replies: 17
Views: 127

Re: Sig Fig Mistakes

In addition to this statement, during calculations it is best not to round as accuracy may be lost in the final answer. Therefore, it is best to round to the least amount of significant figures given to you in the exercise at the end for the answer (as stated below). The number of sig figs you use s...
by Amir Bayat
Thu Oct 03, 2019 11:31 pm
Forum: SI Units, Unit Conversions
Topic: When to use what units
Replies: 5
Views: 52

Re: When to use what units

Converting to moles and liters are appropriate during calculations as conversion factors are easier that way along with formula applications. However, when giving the answer, it is best to try to keep the answer in the same number of significant figures or same format as the numbers are given to you...
by Amir Bayat
Thu Oct 03, 2019 11:21 pm
Forum: Balancing Chemical Reactions
Topic: Question on L.33
Replies: 4
Views: 34

Re: Question on L.33

The value of x would be 2 since Ba has an excess of 2 valence electrons and Br needs two valence electrons.

Making a balanced equation of ...

BaBr2 + 2Cl -> BaCl2 + 2Br.

I believe this may be the quickest way of solving the equation.
by Amir Bayat
Thu Oct 03, 2019 11:15 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question L7
Replies: 3
Views: 59

Re: Question L7

Alright, that is what I believed it to be.

Thank you.
by Amir Bayat
Thu Oct 03, 2019 12:54 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question L7
Replies: 3
Views: 59

Question L7

The question states: The camel stores the fat tristearin, C57H110O6, in its hump. As well as being a source of energy, the fat is also a source of water because, when it is used, the reaction 2 C57H110O6(s) 1 163 O2(g) S 114 CO2(g) 1 110 H2O(l) takes place. (a) What mass of water is available from 1...
by Amir Bayat
Thu Oct 03, 2019 12:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: G 25
Replies: 7
Views: 73

Re: G 25

Update: There is a much faster way to approach this and it is with using the formula below, once we have solved for the amount of molecules of X. number of molecules of X solved for --> 6.0 * 10^20 molecules X + (1/2)^n = 1 molecule. We then take the log of both sides and solve for n... getting 69 a...
by Amir Bayat
Wed Oct 02, 2019 2:38 pm
Forum: Balancing Chemical Reactions
Topic: Question H7a
Replies: 6
Views: 40

Re: Question H7a

How do you know that hydroxide has a -1 charge?

Is this due to hydrogen being in the first row? Then what charge does oxygen have?
by Amir Bayat
Wed Oct 02, 2019 2:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: G 25
Replies: 7
Views: 73

Re: G 25

I understand your guys' reasoning as to why there would be a very, very minute amount of X left in the substance. However, what is the fastest and quickest way to approach a question like this and show work? I understand the conceptual and visualization aspect of it, but doubling until 69 times woul...
by Amir Bayat
Sun Sep 29, 2019 10:55 am
Forum: Empirical & Molecular Formulas
Topic: Question E29D.
Replies: 2
Views: 32

Question E29D.

Hi there, The homework question claims that a chemist measured out 8.61 g of CuCl 2 * 4H 2 O. Part (d) asks for what fraction of the total mass of the sample is due to oxygen? I just want to double check that we only need to divide the molar mass of the sample 206.51 g by 64 g of oxygen (since there...

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