Search found 51 matches

by Angel Gutierrez 2E
Fri Dec 11, 2020 7:30 pm
Forum: Identifying Acidic & Basic Salts
Topic: Conjugate Acids and Bases
Replies: 1
Views: 8

Conjugate Acids and Bases

How do you determine whether a compound is acidic or basic with the conjugate bases or acids of its acid or base?
by Angel Gutierrez 2E
Wed Dec 09, 2020 10:24 pm
Forum: Electronegativity
Topic: Determining Electronegavity with three atoms
Replies: 1
Views: 17

Determining Electronegavity with three atoms

What is the connection between electronegativity and oxyacids? How do you determine the electronegativity between three atoms?
by Angel Gutierrez 2E
Wed Dec 09, 2020 9:59 pm
Forum: Conjugate Acids & Bases
Topic: Deriving from Strong Base/Acid?
Replies: 2
Views: 26

Deriving from Strong Base/Acid?

How do you know which compound is a cation or anion. I'm pretty confused at the feedback. Does someone mind explaining this?
by Angel Gutierrez 2E
Mon Dec 07, 2020 3:32 pm
Forum: Calculating the pH of Salt Solutions
Topic: Does the temperature given matter?
Replies: 5
Views: 39

Does the temperature given matter?

For sapling q 5, I am unable to calculate the H+ ion while using 10-pH, which should be 10^-2.44.

Should I take the temperature into consideration when calculating the H+ ion?
by Angel Gutierrez 2E
Fri Dec 04, 2020 1:19 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bonds and Covalent Bonds
Replies: 7
Views: 92

Coordinate Covalent Bonds and Covalent Bonds

How do you identify a coordinate covalent bond? What is the difference between a coordinate covalent bond and a regular covalent bond?
by Angel Gutierrez 2E
Fri Dec 04, 2020 12:55 pm
Forum: Bronsted Acids & Bases
Topic: Identifying Acids and Bases
Replies: 2
Views: 37

Identifying Acids and Bases

What makes a molecule or compound a base or acid? And how can you identify between the two?
by Angel Gutierrez 2E
Fri Dec 04, 2020 12:52 pm
Forum: Lewis Acids & Bases
Topic: Difference between a Lewis Base/Acid and Bases and Acids
Replies: 2
Views: 30

Difference between a Lewis Base/Acid and Bases and Acids

I understand that the lewis base is an electron-pair donor and the base is a proton acceptor, and it would be vice versa for the lewis acids and acid. But, is there any other difference or distinction between the two?
by Angel Gutierrez 2E
Wed Dec 02, 2020 1:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining Coordination Numbers
Replies: 5
Views: 48

Determining Coordination Numbers

Is a coordination number the amount of ligands? Or do you also take into account the transition metal and total the amount of ligands and the transition metal as the coordination number?
by Angel Gutierrez 2E
Tue Dec 01, 2020 11:10 am
Forum: Naming
Topic: Oxidation State for Sapling q. 6
Replies: 2
Views: 31

Oxidation State for Sapling q. 6

Give the oxidation state of the metal species in the complex [Co(NH3)5Cl]Cl2 .

I understand that the central atom (transition metal) cannot be a negative oxidation number. however, it would make sense to determine its oxidation like so...

[Co + NH3 + Cl= Cl]
x +5(0) +1(-1)= 2(-1)
x-1=-2
x=-1
by Angel Gutierrez 2E
Sat Nov 28, 2020 11:49 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling Wk8 Q. 18, Determining Molecular Shape
Replies: 10
Views: 90

Sapling Wk8 Q. 18, Determining Molecular Shape

does the order of the molecular formula affect the way you draw the structures? FOor example, in H2CCCH2, are two hydrogens supposed to be on each ends?
by Angel Gutierrez 2E
Fri Nov 27, 2020 2:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling 17
Replies: 8
Views: 87

Re: Sapling 17

Does the way you position the atoms matter? I think I have structured all the molecules correctly, but it keeps marking it incorrect.
by Angel Gutierrez 2E
Tue Nov 24, 2020 12:04 am
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula and Empirical Formula Mass
Replies: 6
Views: 73

Molecular Formula and Empirical Formula Mass

Hello,

Would it be possible to get a shrink factor to decrease the subscripts of the empirical formula? In other words, does it make sense to have a smaller molecular formula mass than a empirical formula mass and get a number less than 1 that would half the empirical formula?
by Angel Gutierrez 2E
Mon Nov 23, 2020 11:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Molecular Polarity using VSEPR
Replies: 8
Views: 72

Determining Molecular Polarity using VSEPR

Why would a linear shape describe a nonpolar molecule such as CO2?
by Angel Gutierrez 2E
Fri Nov 20, 2020 2:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair Decrease Bond Angle
Replies: 1
Views: 23

Lone Pair Decrease Bond Angle

What is the reasoning behind the fact that lone pairs decreasing the bond angle? Do lone pairs have a stronger repulsion force?
by Angel Gutierrez 2E
Fri Nov 20, 2020 2:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H20 Bent Structure
Replies: 14
Views: 109

H20 Bent Structure

Why is the H20 molecule bent? Why are the lone pairs in Oxygen next to each other when there should be a repulsion in lone pairs?
by Angel Gutierrez 2E
Fri Nov 20, 2020 2:04 pm
Forum: Dipole Moments
Topic: Dipole Moments Cancelling out
Replies: 10
Views: 107

Dipole Moments Cancelling out

In Dr. Lavelle's Friday (Nov. 20) lecture, he explains that a polar molecule does not have dipole moments that cancel out. In cis-dichloretene, the dipole moments point away from each other. In a non polar molecule, the dipole moments, still point away from each other but they are still considered t...
by Angel Gutierrez 2E
Fri Nov 20, 2020 2:01 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Bonds in Double Bonds
Replies: 2
Views: 58

Sigma Bonds in Double Bonds

How are you able to visualize the presence of sigma bonds in a molecular structure. I understand the bonding of s-orbitals, and how they merge between a bond. They appear to get closer when they bond, is that the same thing when visualizing two atoms, do they get closer due to the sigma bonds?
by Angel Gutierrez 2E
Fri Nov 20, 2020 1:59 pm
Forum: Sigma & Pi Bonds
Topic: Hybridization
Replies: 7
Views: 92

Hybridization

In Dr. Lavelle's lecture, he combines the atomic orbitals from the same shell (n=2) to make hybrid orbitals. Is hybridization the process of making atomic orbitals hybrid?
by Angel Gutierrez 2E
Sun Nov 15, 2020 9:23 pm
Forum: Resonance Structures
Topic: Determining oxidation numbers?
Replies: 9
Views: 45

Re: Determining oxidation numbers?

oxidation means that the atom, molecule, or ion loses an electron.
by Angel Gutierrez 2E
Sun Nov 15, 2020 9:21 pm
Forum: Dipole Moments
Topic: Strength of Dipole-Dipole vs Induced Dipole-Dipole
Replies: 4
Views: 17

Re: Strength of Dipole-Dipole vs Induced Dipole-Dipole

What is the difference between an induced dipole-dipole and a dipole-dipole reaction?
by Angel Gutierrez 2E
Sun Nov 15, 2020 8:59 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Plausible Formal Charges
Replies: 6
Views: 34

Plausible Formal Charges

Would the most stable resonance structure be considered the structure with a formal charge of 0?
by Angel Gutierrez 2E
Sat Nov 14, 2020 9:52 pm
Forum: Resonance Structures
Topic: Determining oxidation numbers?
Replies: 9
Views: 45

Determining oxidation numbers?

Sapling q. 9 asks to determine the oxidation number of chlorine in the perchlorate ion? How would I go about determining the oxidation number?
by Angel Gutierrez 2E
Sat Nov 14, 2020 9:15 pm
Forum: Electronegativity
Topic: Relationship between Dispersion and Electronegativity
Replies: 6
Views: 30

Relationship between Dispersion and Electronegativity

How are you able to identify dispersion forces? The difference in electronegativity, when it is small, it is a covalent bond. Is there a relationship between electronegativity and dispersion forces?
by Angel Gutierrez 2E
Sat Nov 07, 2020 8:28 pm
Forum: Lewis Structures
Topic: Phosphite ion and nitrate ion
Replies: 1
Views: 21

Phosphite ion and nitrate ion

Why are there only two oxygens in the nitrite ion and three oxygen atoms in the phosphite ions?
by Angel Gutierrez 2E
Sat Nov 07, 2020 4:27 pm
Forum: Lewis Structures
Topic: Lewis Base (NH3)
Replies: 3
Views: 19

Lewis Base (NH3)

Why would NH3 be considered a lewis base?

Also, are all anions considered lewis bases because they typically have more electrons to share than cations and stable atoms?
by Angel Gutierrez 2E
Sat Nov 07, 2020 4:25 pm
Forum: Octet Exceptions
Topic: Why do Octet Excpetions Happen?
Replies: 4
Views: 59

Why do Octet Excpetions Happen?

I understand that Helium can only have two valence electrons, since they only carry one, but why are there other exceptions to the octet rule, and why does that occur?
by Angel Gutierrez 2E
Thu Nov 05, 2020 8:27 pm
Forum: Ionic & Covalent Bonds
Topic: Polyatomics ions
Replies: 4
Views: 17

Polyatomics ions

For q. 2, it asks to draw the lewus structure of the polyatomic ions, does this mean that they are ionic? If so, why are both elements in NH4 are nonmetals?
by Angel Gutierrez 2E
Mon Oct 26, 2020 9:07 pm
Forum: Quantum Numbers and The H-Atom
Topic: 4th quantum number
Replies: 8
Views: 45

4th quantum number

I am confused on how to determine if the fourth quantum number. I dont understand the concept between this number as well, all i know is that there are two possible solutions which are 1/2 and -1/2 if i am correct. Thank you!
by Angel Gutierrez 2E
Mon Oct 26, 2020 9:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: s/p/d Blocks
Replies: 2
Views: 39

s/p/d Blocks

Can someone please explain to me the concepts between the blocks Dr. Lavelle mentioned that are on the periodic table. Is this a reason to why the electron config. of an element can skip subshells like 3d.
by Angel Gutierrez 2E
Mon Oct 26, 2020 9:02 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Subshells
Replies: 2
Views: 27

Subshells

I am confused on why you would jump from 3p subshell to a 4s subshell and ignore the 3d subshell in some elements?
by Angel Gutierrez 2E
Mon Oct 26, 2020 9:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 230
Views: 118008

Re: Advice from a Medical Student [ENDORSED]

Would you say your major holds heavy weight when applying to med school? Is there a contrast between an applicant who has a degree in psych and another with a physci degree? Thank you so much for your advice!
by Angel Gutierrez 2E
Mon Oct 26, 2020 8:55 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Sapling Homework #22
Replies: 3
Views: 58

Re: Sapling Homework #22

you would use de brogile equation in order to find the kinetic energy which is 1/2mv^2. when rearragning the debrogile equation, you can solve for v to plug v back into the kinetic energy equation!
by Angel Gutierrez 2E
Mon Oct 26, 2020 8:34 pm
Forum: Significant Figures
Topic: Rouding Range
Replies: 7
Views: 102

Rouding Range

Does anybody know the rounding range that will get you the correct answer for the midterms?
by Angel Gutierrez 2E
Sat Oct 24, 2020 11:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Saping HW Q.8
Replies: 8
Views: 77

Re: Saping HW Q.8

Madison Wong 1G wrote:How do we know that n1=2? Is it characteristic of visible light in general or did it require solving?

it is based on the balmer series, which is the visible light and it starts at n=1
by Angel Gutierrez 2E
Fri Oct 23, 2020 12:03 am
Forum: DeBroglie Equation
Topic: Sapling Hw 2 #19
Replies: 10
Views: 130

Re: Sapling Hw 2 #19

Allan Nguyen 2E wrote:I would just make sure to check for unit conversions. Don't forget that the joule unit in Planck's constant for the De Broglie equation is 1 kg.m^2.s^-2




Does this mean that you do not input the value as 6.626*10^-34 J.s into the equation?
by Angel Gutierrez 2E
Thu Oct 22, 2020 11:56 pm
Forum: DeBroglie Equation
Topic: Rearranging De Broglie Equation
Replies: 17
Views: 116

Re: Rearranging De Broglie Equation

When you have values with a neg exponent and they are the denominator in the equations, do you change the negative exponents as a positive since they become part of the denominator?
by Angel Gutierrez 2E
Thu Oct 22, 2020 11:39 pm
Forum: DeBroglie Equation
Topic: Sapling Hw 2 #19
Replies: 10
Views: 130

Re: Sapling Hw 2 #19

Also, I'm not sure if this would help but i converted the wavelength from nm into meters.
by Angel Gutierrez 2E
Thu Oct 22, 2020 11:39 pm
Forum: DeBroglie Equation
Topic: Sapling Hw 2 #19
Replies: 10
Views: 130

Re: Sapling Hw 2 #19

yes, the mass should be converted into kg since it is usually measured in those units.

Quick q, did you set up your de brogile equation as velocity=planks constant*mass/wavelength? I also can't get it right and im not sure what im doing wrong
by Angel Gutierrez 2E
Thu Oct 22, 2020 9:38 pm
Forum: Properties of Electrons
Topic: Sapling 2 HW #6
Replies: 10
Views: 136

Re: Sapling 2 HW #6

Wouldn't you have to subtract the final - initial? and the problem says that the electron was lowered down to lower energy levels so n=1-n=5? I don't understand what I'm doing wrong because i subtract it the other way and I use -h*R/n^2 to get the change in energy for one level to subtract by the ot...
by Angel Gutierrez 2E
Tue Oct 20, 2020 12:35 pm
Forum: Properties of Electrons
Topic: Sapling Q 4 Part 2
Replies: 3
Views: 22

Sapling Q 4 Part 2

What is the max. number of electrons that could be ejected from this metal by a burst of photons (at some other frequency) with a total energy of 4.25*10^-7 J? I understand that you have to divide the energy of one photon by the total energy to get the maximum number of electrons but how would i get...
by Angel Gutierrez 2E
Sat Oct 17, 2020 4:02 pm
Forum: Properties of Light
Topic: Speed of Light Equation
Replies: 6
Views: 48

Speed of Light Equation

Can the speed of light equation differ from 3.00 *10^8 m.s^-1 since Professor Lavelle mentioned that the equation will be given in the Module for this topic. Will we be given a reference sheet for the exam? Or can the speed of light equation change depending on the problem you're working on?
by Angel Gutierrez 2E
Sat Oct 17, 2020 12:15 pm
Forum: Properties of Electrons
Topic: Work function/Threshold Energy
Replies: 19
Views: 93

Work function/Threshold Energy

I am confused on what the threshold energy means when talking about the photoelectric effect. I understand that the work function is the minimum amount of energy required to remove an electron from the metal. But are the threshold energy and the work function related in any way?

Thank you!
by Angel Gutierrez 2E
Fri Oct 16, 2020 1:55 pm
Forum: Properties of Electrons
Topic: Using empirical equation for h-atom
Replies: 4
Views: 29

Using empirical equation for h-atom

Ex. Calculate the frequency of light emitted by a hydrogen atom when an electron makes a transition from the fourth to the second principal quantum model. I understand how professor lavelle changed the equation from e=hv to v=e/h to find the frequency. But i do not understand where the fractions suc...
by Angel Gutierrez 2E
Wed Oct 14, 2020 6:41 pm
Forum: Properties of Light
Topic: Sapling HW 1
Replies: 2
Views: 40

Sapling HW 1

Why does the frequency and kinetic energy for the answer in #1 differ if they are proportional to each other? Why is it that a pulse of light containing a 100 photons is only lambda, v, and 100e?
by Angel Gutierrez 2E
Wed Oct 14, 2020 6:27 pm
Forum: Properties of Light
Topic: Example 1 in Wk 2 Lec 2
Replies: 3
Views: 21

Example 1 in Wk 2 Lec 2

Can someone explain how Professor Lavelle combined the equations, E=h*v and c=lambda*v, to lambda=h*c/E for Lec 2 of Wk 2?
by Angel Gutierrez 2E
Wed Oct 14, 2020 6:26 pm
Forum: Properties of Light
Topic: Example 1 in Wk 2 Lec 2
Replies: 1
Views: 21

Example 1 in Wk 2 Lec 2

Can someone explain how Professor Lavelle combined the equations, E=h*v and c=lambda*v, to lambda=h*c/E for Lec 2 of Wk 2?
by Angel Gutierrez 2E
Sun Oct 11, 2020 6:17 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Empirical Formula
Replies: 10
Views: 100

Finding Empirical Formula

In the module example, Dr. Lavelle multiples the ratios times three after finding dividing the ratios from the smallest ratio. And he got 1:1.33:1. Why did he have to multiple this ratio to then get the empirical formula?
by Angel Gutierrez 2E
Tue Oct 06, 2020 10:46 pm
Forum: SI Units, Unit Conversions
Topic: E.17c
Replies: 2
Views: 18

E.17c

Hello,

for part c, I am multiplying the number of atoms times avogadro's constant. Are you supposed to get the same value for both elements?
by Angel Gutierrez 2E
Tue Oct 06, 2020 10:21 pm
Forum: SI Units, Unit Conversions
Topic: E.9
Replies: 2
Views: 40

E.9

How do you find the formula units for part b after you find the amount of O atoms in part a (which i think should be 1.2*10^24 if im not mistaken)?

Also, how would you find the amount of water molecules in MgSO4?

Thank you!
by Angel Gutierrez 2E
Tue Oct 06, 2020 10:12 pm
Forum: SI Units, Unit Conversions
Topic: Problem E3
Replies: 1
Views: 34

Problem E3

Hello,

Would I be using a mole to mole ratio for this problem? I'm confused on how to set up my conversion equation.
by Angel Gutierrez 2E
Tue Oct 06, 2020 9:35 pm
Forum: SI Units, Unit Conversions
Topic: Problem E1, use of conversion factor?
Replies: 3
Views: 34

Problem E1, use of conversion factor?

Am I supposed to convert the 1 mol of Ag into pm using its radius using a conversion factor? I'm a bit confused.

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