Search found 65 matches

by Fatemah Yacoub 1F
Thu Jan 16, 2020 8:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6D.3
Replies: 1
Views: 5

Re: 6D.3

I got those answers as well!
by Fatemah Yacoub 1F
Thu Jan 16, 2020 8:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Solids and Liquids in Le Chatelier
Replies: 5
Views: 17

Re: Solids and Liquids in Le Chatelier

No since solids and liquids are not even used to calculate K they are disregarded in Le Chateliers. Solids and liquids do not affect the equilibrium.
by Fatemah Yacoub 1F
Thu Jan 16, 2020 8:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: strong/weak acids and bases
Replies: 2
Views: 6

Re: strong/weak acids and bases

You must memorize the strong/weak acids and bases in order to figure it out in a problem.
by Fatemah Yacoub 1F
Thu Jan 16, 2020 8:31 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE and quadratic formula
Replies: 11
Views: 29

Re: ICE and quadratic formula

For some problems you must use the quadratic formula, there is no way around it. Even when you ignore K you must do the 5% approximation check.
by Fatemah Yacoub 1F
Tue Jan 14, 2020 10:04 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 5I.13
Replies: 3
Views: 23

5I.13

Can someone explain part C of 5I.13? What would the equilibrium constant tell us in terms of stability?
by Fatemah Yacoub 1F
Fri Jan 10, 2020 7:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Graphing K and Q Values
Replies: 4
Views: 19

Re: Graphing K and Q Values

I think graphing is a very complex way of showing q vs k which is more visually favorable, but is not necessary to determine q vs k. I think due to time constraints it would not be reasonable to graph q vs k.
by Fatemah Yacoub 1F
Fri Jan 10, 2020 7:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure Substance
Replies: 5
Views: 23

Re: Pure Substance

The activity of pure substances are actually not equal to zero they are equal to one.
by Fatemah Yacoub 1F
Fri Jan 10, 2020 4:52 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Today's Lecture
Replies: 3
Views: 22

Today's Lecture

Can someone explain what he was trying to say in todays lecture when he said that simply comparing the mole ratio would give the right answer but the wrong reasoning? What is the proper reasoning to explain change in pressure?
by Fatemah Yacoub 1F
Wed Jan 08, 2020 11:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.1
Replies: 1
Views: 15

5G.1

Can someone explain part C of 5G.1. The question is talking about pressure but the answer only addresses amount of reactant and product which is confusing.
by Fatemah Yacoub 1F
Wed Jan 08, 2020 11:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.7
Replies: 2
Views: 21

5G.7

In 5G.7 why did they write K in terms of Kc if all the products and reactants are gases? Should it be in terms of Kp?
by Fatemah Yacoub 1F
Sun Dec 08, 2019 10:18 am
Forum: Calculating the pH of Salt Solutions
Topic: 6.13
Replies: 1
Views: 27

Re: 6.13

I think it is referring to the conjugate seesaw in which a strong acid has a weak conjugate base and vice versa.
by Fatemah Yacoub 1F
Tue Dec 03, 2019 11:32 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: J.23
Replies: 2
Views: 26

Re: J.23

I think that since these are common acids that you should know them.
by Fatemah Yacoub 1F
Tue Dec 03, 2019 11:28 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Definition of Acid
Replies: 4
Views: 31

Re: Definition of Acid

A Lewis acid simply includes more molecules than a Bronsted acid. They are both proper definitions for acids, but a Lewis acid is more broad and includes more molecules.
by Fatemah Yacoub 1F
Tue Dec 03, 2019 11:26 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Electronegativity and Acid Strength
Replies: 3
Views: 30

Re: Electronegativity and Acid Strength

This is because an electronegative atom has a more stable resulting anion. In H-O-F and H-O-Cl the more EN F pulls the charge away from the O delocalizing the electrons and making the resulting anion more stable and HF a stronger acid.
by Fatemah Yacoub 1F
Tue Dec 03, 2019 11:19 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6C17 - strength of bases
Replies: 4
Views: 50

Re: 6C17 - strength of bases

I remember during lecture he said anything with Nitrogen is usually a weak base. So that is a good rule of thumb.
by Fatemah Yacoub 1F
Tue Dec 03, 2019 11:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: acidic trends
Replies: 3
Views: 28

Re: acidic trends

Another way of thinking about it is the strength of an acid can be related to electronegativity because in the case of H-O-F and H-O-Cl since F is more electronegative it pulls on the oxygen weakening the O-H bond making HF a stronger acid.
by Fatemah Yacoub 1F
Fri Nov 29, 2019 11:00 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Weak Acids and Bases
Replies: 5
Views: 239

Re: Weak Acids and Bases

Since strong bases fully dissociate a helpful tip is that if Kb is given it is implying a weak base.
by Fatemah Yacoub 1F
Fri Nov 29, 2019 10:55 am
Forum: Bronsted Acids & Bases
Topic: Naming Acids and Bases
Replies: 3
Views: 36

Re: Naming Acids and Bases

I don't think we need to know any complicated ones, but you should know the rules and the most common acids/bases.
by Fatemah Yacoub 1F
Fri Nov 29, 2019 10:53 am
Forum: Bronsted Acids & Bases
Topic: Difference between bronsted and lewis acid/base?
Replies: 6
Views: 31

Re: Difference between bronsted and lewis acid/base?

Not a single one is correct to define an acid or base, but you should know the difference between them.
by Fatemah Yacoub 1F
Fri Nov 29, 2019 10:48 am
Forum: Lewis Acids & Bases
Topic: Weak and Strong Acids and Bases
Replies: 3
Views: 15

Re: Weak and Strong Acids and Bases

For strong acids I had to memorize them as HCl, HBr, HI, HCLO3, HCLO4, HNO3, and H2SO4, but I don't know if Lavelle wants us to know any others.
by Fatemah Yacoub 1F
Fri Nov 29, 2019 10:46 am
Forum: Lewis Acids & Bases
Topic: Weak and Strong Acids and Bases
Replies: 3
Views: 15

Re: Weak and Strong Acids and Bases

The strong bases are any group I or II oxides and hydroxides and an indication of a weak base is basically anything with N in it.
by Fatemah Yacoub 1F
Fri Nov 22, 2019 8:55 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 2
Views: 19

Re: Ligands

It might refer to where the ligand makes a coordination bond with the central atom.
by Fatemah Yacoub 1F
Fri Nov 22, 2019 8:52 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Number of Coordination Bonds
Replies: 2
Views: 23

Re: Number of Coordination Bonds

I think you would have to find the oxidation number on the transition metal first and then from there you can determine how many coordination bonds that can form.
by Fatemah Yacoub 1F
Wed Nov 20, 2019 1:00 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 4
Views: 47

Cisplatin

Can someone explain how cisplatin stops cell division?
by Fatemah Yacoub 1F
Tue Nov 19, 2019 9:53 am
Forum: Hybridization
Topic: Energy in Hybridization
Replies: 3
Views: 27

Re: Energy in Hybridization

In class when he was mentioning that energy was increasing he was referring to the original orbitals of 2s and 2p. He drew the arrow of increasing energy next to these orbitals and then put the hybridized orbital in the middle of the 2s and 2p because a hybridized orbital has energy somewhere betwee...
by Fatemah Yacoub 1F
Mon Nov 18, 2019 3:35 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 15
Views: 79

Re: Sigma and Pi Bonds

As long as you state there is one sigma and 2 pi bonds it doesn't matter how you assign them.
by Fatemah Yacoub 1F
Mon Nov 18, 2019 3:32 pm
Forum: Hybridization
Topic: Pi and sigma bonds
Replies: 4
Views: 43

Re: Pi and sigma bonds

A sigma bond almost always forms first so automatically a multiple bond will have one sigma bond. Since pi bonds overlap side by side that is why they form on multiple bonds. Therefore any multiple bond will have one sigma bond and then either 1 or 2 pi bonds.
by Fatemah Yacoub 1F
Fri Nov 15, 2019 9:19 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Other shapes
Replies: 3
Views: 22

Re: Other shapes

Yes, I believe we are responsible for knowing all of the shapes for the test.
by Fatemah Yacoub 1F
Fri Nov 15, 2019 9:16 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Bond Angle
Replies: 3
Views: 21

Re: Determining Bond Angle

It is based on a case by case basis and what shape the lone pairs are affecting. You just have to visualize the effect of the lone pair based on the VSEPR shape you have.
by Fatemah Yacoub 1F
Fri Nov 15, 2019 9:14 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Nonpolar molecules
Replies: 4
Views: 24

Re: Polar vs Nonpolar molecules

It's helpful remember that the polarity should be based off of the VSEPR model and not the Lewis Structure. Since the VSEPR model is the actual shape and often looks a lot different than the lewis structure, the polarity would be based off of the VSEPR model.
by Fatemah Yacoub 1F
Fri Nov 15, 2019 9:11 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Symmetry and Polarity
Replies: 13
Views: 73

Re: Symmetry and Polarity

Sometimes symmetry alludes to polarity but since most of the time the lewis structure isn't the actual representation you have to base it off of the VSEPR model. A symmetric Lewis structure does not automatically mean the molecule is non polar because the VSEPR model is the actual shape of the molec...
by Fatemah Yacoub 1F
Fri Nov 15, 2019 9:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent or angular?
Replies: 2
Views: 29

Re: Bent or angular?

I think it should be fine either way because bent and angular refer to the same shape.
by Fatemah Yacoub 1F
Sun Nov 10, 2019 6:29 pm
Forum: Dipole Moments
Topic: Interactions
Replies: 4
Views: 30

Re: Interactions

For the purposes of this class they are the same, but in induced dipole moments the molecule that induces the dipole moments has a permanent dipole moment while the same does not occur in London Dispersion Forces.
by Fatemah Yacoub 1F
Sun Nov 10, 2019 6:25 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Polarizability
Replies: 3
Views: 28

Re: Polarizability

With greater polarizability, the electron cloud is able to be distorted more. Therefore it is easier to form IMFs because since the electron cloud can easily be distorted it is more attracted to partial positive charges.
by Fatemah Yacoub 1F
Sun Nov 10, 2019 10:20 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: London vs. dipole-induced-dipole interaction
Replies: 3
Views: 17

Re: London vs. dipole-induced-dipole interaction

In addition, in dipole-induced-dipole interaction the molecule that induces the dipole moment has a permanent dipole moment while it does not in London Dispersion.
by Fatemah Yacoub 1F
Sun Nov 10, 2019 10:17 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Electrostatic Meaning
Replies: 2
Views: 22

Re: Electrostatic Meaning

It mainly pertains to electrostatic interaction which is the interaction between objects having electrical charges. These forces are what give rise to IMFs.
by Fatemah Yacoub 1F
Mon Nov 04, 2019 9:58 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polar Covalent VS Ionic
Replies: 11
Views: 59

Polar Covalent VS Ionic

How do you determine if a bond is polar covalent or ionic without looking at ionization energies?
by Fatemah Yacoub 1F
Wed Oct 30, 2019 1:54 pm
Forum: Electronegativity
Topic: Exceptions to ionization energy trend?
Replies: 2
Views: 16

Re: Exceptions to ionization energy trend?

There are several transition metals that break the trend in ionization energy, but it depends on a case by case basis. I do not think we are going to be responsible for knowing those.
by Fatemah Yacoub 1F
Wed Oct 30, 2019 1:52 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 11
Views: 53

Re: Electronegativity

An easy way to remember the trends is electronegativity, ionization energy, and electron affinity all have the same periodic trend.
by Fatemah Yacoub 1F
Wed Oct 30, 2019 1:50 pm
Forum: Octet Exceptions
Topic: Octet Rule Exceptions
Replies: 4
Views: 31

Re: Octet Rule Exceptions

If the atom is in a n=3 shell or higher and has an empty d orbital (elements in the p block) it will be able to expand its octet.
by Fatemah Yacoub 1F
Tue Oct 29, 2019 10:09 am
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 182

Re: Midterm

The midterm covers all the material up to the end of Outline 3: Chemical Bonds.
by Fatemah Yacoub 1F
Mon Oct 28, 2019 10:09 am
Forum: Formal Charge and Oxidation Numbers
Topic: In Class Example, Sulfate
Replies: 3
Views: 42

In Class Example, Sulfate

When computing the formal charges for SO4^2- in class he said that by adding more bonds and making all the oxygens have a 0 formal charge it would make sulfur have a 2- charge and we would rather have the sulfur have a 0 charge than the oxygens? Why would the compound be more stable with oxygen havi...
by Fatemah Yacoub 1F
Fri Oct 25, 2019 9:37 pm
Forum: Octet Exceptions
Topic: Resonance structures
Replies: 5
Views: 30

Re: Resonance structures

I think you have to draw out all of the possible resonance structures for a compound to portray all the possible positions for the multiple bonds.
by Fatemah Yacoub 1F
Fri Oct 25, 2019 9:35 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Expanded Valence Shells
Replies: 5
Views: 34

Expanded Valence Shells

I was confused as to why P,S, and Cl have an expanded octet if they have no electrons in the d orbital?
by Fatemah Yacoub 1F
Fri Oct 25, 2019 9:31 pm
Forum: Resonance Structures
Topic: Lewis Structure vs. Resonance Structure
Replies: 4
Views: 31

Re: Lewis Structure vs. Resonance Structure

A resonance structure is specifically related towards elements with double and triple bonds. A resonance structure is basically all of the variations of having a double and triple bond. A Lewis Structure is the basic structure of a compound and while it may contain a double or triple bond it does no...
by Fatemah Yacoub 1F
Wed Oct 23, 2019 1:50 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework Help
Replies: 5
Views: 37

Re: Homework Help

One way to look at it would be that the ground state of an electron would be the normal electron configuration. If the electron configuration is off in any way such as electrons being paired while the orbitals are not yet completely filled, then the electron is considered to be in an excited state.
by Fatemah Yacoub 1F
Tue Oct 22, 2019 2:40 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy for the 2nd Electron
Replies: 3
Views: 18

Re: Ionization Energy for the 2nd Electron

Yes, the second ionization is always higher regardless of whether the electron would gain a full octet or not. The second ionization is always higher because it takes more energy to remove an electron positively charged ion( since one electron has already been removed) rather than a neutral atom.
by Fatemah Yacoub 1F
Mon Oct 21, 2019 1:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Spin
Replies: 8
Views: 55

Re: Electron Spin

When simply drawing out the configurations once all the oribtals have atleast one electron( at this point they are all parallel to one another) then when more electrons are added, the electrons in the same orbital begin to get paired. All of the orbitals must be filled by at least one electron befor...
by Fatemah Yacoub 1F
Thu Oct 17, 2019 11:31 am
Forum: Properties of Electrons
Topic: The wave property of electrons [ENDORSED]
Replies: 2
Views: 35

Re: The wave property of electrons [ENDORSED]

In addition if electrons only acted like waves then increasing the intensity of light would yield more electron ejection, but that was not the case.
by Fatemah Yacoub 1F
Thu Oct 17, 2019 11:29 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin State
Replies: 17
Views: 77

Re: Spin State

Calculating spin state is not necessary as it will always be either +1/2 or -1/2. The positives and negatives simply represent whether the electron is spinning clockwise or counterclockwise
by Fatemah Yacoub 1F
Wed Oct 16, 2019 2:42 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal plane for s-orbitals?
Replies: 3
Views: 24

Re: Nodal plane for s-orbitals?

S orbitals have no nodal planes simply due to their shape. S orbitals are symmetrical and basically look like a sphere. For this reason they have no nodal planes.
by Fatemah Yacoub 1F
Tue Oct 15, 2019 10:18 pm
Forum: Properties of Electrons
Topic: Intensity vs. Energy
Replies: 10
Views: 70

Re: Intensity vs. Energy

In terms of a photoelectric experiment, the intensity is determined by the number of photons present. That's why increasing the intensity in a photoelectric experiment did not yield more electrons being ejected. Energy however is determined by frequency and the frequency has a minimum value dependin...
by Fatemah Yacoub 1F
Mon Oct 14, 2019 4:47 pm
Forum: *Shrodinger Equation
Topic: Class Lecture 10/14
Replies: 1
Views: 37

Class Lecture 10/14

Today in class the professor kept saying that the mathematical functions matched the experimental results from the spectroscopic data, but which mathematical functions was he specifically referring to and how do they match the experimental results?
by Fatemah Yacoub 1F
Thu Oct 10, 2019 4:09 pm
Forum: Properties of Electrons
Topic: Energy of Electron
Replies: 10
Views: 95

Re: Energy of Electron

By the energy of an electron is quantized he is saying that the energy levels of an electron are discrete. So n must be a whole number energy level.
by Fatemah Yacoub 1F
Thu Oct 10, 2019 4:06 pm
Forum: Properties of Light
Topic: Energy of light
Replies: 4
Views: 43

Re: Energy of light

Yes it is always true and simply looking at it from a mathematical perspective if you have the equation c= frequency x wavelength and c is a constant that means frequency and wavelength must always have an inverse relationship.
by Fatemah Yacoub 1F
Wed Oct 09, 2019 1:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Positive/ Negative regarding E
Replies: 3
Views: 33

Positive/ Negative regarding E

In class today after we got a negative change in energy because it went from n=4 to n=2, but when we plugged it into E=hv we ignored the negative and simply plugged in the positive value of E. I was wondering why we ignored the fact that we got a negative E while finding the change in energy?
by Fatemah Yacoub 1F
Tue Oct 08, 2019 7:57 pm
Forum: Molarity, Solutions, Dilutions
Topic: Clarification for problem G.21?
Replies: 3
Views: 52

Re: Clarification for problem G.21?

Basically the problem is asking for the concentration of a specific ion so you just have to remember the ration of the concentration of each specific ion to the ratio of the entire compound.
by Fatemah Yacoub 1F
Mon Oct 07, 2019 6:19 pm
Forum: SI Units, Unit Conversions
Topic: Writing formulas
Replies: 4
Views: 70

Re: Writing formulas

I would know the basic rules for naming compounds as well as the most common polyatomic ions because they come up pretty frequently.
by Fatemah Yacoub 1F
Sat Oct 05, 2019 4:44 pm
Forum: Balancing Chemical Reactions
Topic: H7
Replies: 3
Views: 34

Re: H7

I would just try and learn the charges of the major elements based on groups in the periodic table.
by Fatemah Yacoub 1F
Sat Oct 05, 2019 4:41 pm
Forum: Limiting Reactant Calculations
Topic: Explaining why a reactant is limiting
Replies: 4
Views: 57

Re: Explaining why a reactant is limiting

To attempt to explain a limiting reactant the most plausible explanation is that one of the reactants is completely used up before the other affecting the amount of product formed. From there you can use numbers from any specific problem to further prove your point.
by Fatemah Yacoub 1F
Thu Oct 03, 2019 9:55 am
Forum: Molarity, Solutions, Dilutions
Topic: HW E.23
Replies: 3
Views: 18

Re: HW E.23

Basically when you are dealing with ions, the very end of your dimensional analysis is multiplying by the number of ions(the one you are trying to solve for) in your formula. So in E. 23 part a. you start with 3.00g of CuBr2 use the mole ratio using the molar mass and then since the formula is CuBr2...
by Fatemah Yacoub 1F
Thu Oct 03, 2019 9:47 am
Forum: Limiting Reactant Calculations
Topic: Solving for remaining moles of the excess (M5)
Replies: 2
Views: 30

Re: Solving for remaining moles of the excess (M5)

Another way of thinking about it is after finding the moles of either ClO2 or Br2, you can simply convert either of those to find the moles of BrF3 used in the reaction and subtract those moles from the original 5 moles.
by Fatemah Yacoub 1F
Wed Oct 02, 2019 1:59 pm
Forum: Limiting Reactant Calculations
Topic: M#11
Replies: 2
Views: 34

M#11

I was wondering if someone could explain M#11?
by Fatemah Yacoub 1F
Tue Oct 01, 2019 9:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 6
Views: 78

Formula Units

I was wondering how to figure out the formula units for a problem? Does it always include using Avagadros Number? Will there ever be an instance where the conversion will not be 1 mole/ 6.02x10^23 formula units?
by Fatemah Yacoub 1F
Mon Sep 30, 2019 2:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 130
Views: 2926

Re: Advice from a Medical Student - Part II [ENDORSED]

As someone who takes a lot of interest in the medical field, it is so refreshing to see someone who has worked their way through medicine. I really appreciate the time and resources you are dedicating to us. Thank you!!

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