Search found 98 matches

by Alan Cornejo 1a
Tue Mar 17, 2020 5:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

What do you call a tooth in a glass of water? A one molar solution!
by Alan Cornejo 1a
Tue Mar 17, 2020 5:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Carbon and hydrogen went on a date. I heard they really bonded
by Alan Cornejo 1a
Tue Mar 17, 2020 5:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Why does a hamburger have less energy than steak? Because it's in the ground state!
by Alan Cornejo 1a
Tue Mar 17, 2020 5:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Old chemists never die. They just stop reacting
by Alan Cornejo 1a
Tue Mar 17, 2020 5:18 pm
Forum: Student Social/Study Group
Topic: Coronavirus Joke
Replies: 14
Views: 743

Re: Coronavirus Joke

hahahahaha thanks for that !
by Alan Cornejo 1a
Tue Mar 17, 2020 5:15 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Microstates
Replies: 4
Views: 100

Re: Microstates

Nathan Rothschild_2D wrote:They are not the same thing, just related
W=X^n
Where W= Degeneracy, X=the number if possible microstates, n=number of available particles


This is correct, they are two distinct things but they can be related with an equation
by Alan Cornejo 1a
Tue Mar 17, 2020 5:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What to do if R>P for two equations
Replies: 4
Views: 115

Re: What to do if R>P for two equations

Jiyoon_Hwang_2I wrote:You should calculate Q and K and if Q < K then the reaction is product favored and will shift to the right


This is correct you would look at the two reactions individually, and determine Q's value relative to K
by Alan Cornejo 1a
Tue Mar 17, 2020 5:08 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Units for delta G
Replies: 14
Views: 231

Re: Units for delta G

Your units in the end, end up canceling eachother out with the exception of kj which is what you are calculating for deltaG.
by Alan Cornejo 1a
Tue Mar 17, 2020 5:06 pm
Forum: *Alkanes
Topic: Alkaline environment
Replies: 3
Views: 259

Re: Alkaline environment

KaleenaJezycki_1I wrote:Why is this??


I also wonder this, I've been researching and googling but there only the conclusions that nothing can survive in a highly alkaline environment, but nowhere it really explains how.
by Alan Cornejo 1a
Tue Mar 17, 2020 4:59 pm
Forum: Administrative Questions and Class Announcements
Topic: final grades
Replies: 12
Views: 252

Re: final grades

In addition to being able to see our grades, does anyone also know if we will be able to review our answers? I would like to see the questions I got wrong. How will we be able to see these? Is he releasing the final exams online? We'll be able to see specifically what we missed because we took the ...
by Alan Cornejo 1a
Tue Mar 17, 2020 4:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grades
Replies: 6
Views: 181

Re: Final Grades

The grades will probably be done and posted by the end of this week
by Alan Cornejo 1a
Tue Mar 17, 2020 4:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grades
Replies: 6
Views: 181

Re: Final Grades

^^ I agree. The fact that he said he would upload chemistry community grades on thursday I'm assuming means he's going to upload all the other grades too. Especially since the final was multiple choice it shouldn't take long for him to grade and upload Also agree, the final was graded on the spot s...
by Alan Cornejo 1a
Tue Mar 17, 2020 4:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Athena
Replies: 34
Views: 1974

Re: Athena

Thank you professor for being quite possibly the most caring and genuine teacher I have ever met. Your determination for students to understand the material and do their best portrays just how much you care for your students !
by Alan Cornejo 1a
Tue Mar 17, 2020 4:52 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 44
Views: 2071

Re: Class Grading

This is correct, although the only real curve is that you need 250 points to pass the class with a c-
by Alan Cornejo 1a
Tue Mar 17, 2020 4:51 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

The proton is not speaking to the other proton, he’s mad atom
by Alan Cornejo 1a
Tue Mar 17, 2020 4:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Two molecules are walking down the street and they run into each other. One says to the other, "Are you all right?"
"No, I lost an electron!"
"Are you sure?" "I'm positive!"
by Alan Cornejo 1a
Sun Mar 15, 2020 8:06 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 968

Re: Kelvin or Celsius?

Use kelvin and make sure your units match up.
by Alan Cornejo 1a
Sun Mar 15, 2020 8:03 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Equations
Replies: 8
Views: 108

Re: Equations

I would say there are three main ones, ∆G° = ∆H° - T∆S°and ∆G° = - RT ln K and G=-nFE . All of these are given on the constants sheet, and so being able to derive these equations and manipulate them to find them to your suitable variable you need to calculate is what you will most be needing to do
by Alan Cornejo 1a
Sun Mar 15, 2020 8:01 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: spontaneity
Replies: 4
Views: 88

Re: spontaneity

When your deltaG value is negative you will have a spontaneous reaction, when it is positive it will not be. When a reaction is exothermic it is spontaneous, and when is is endothermic it is not. Exothermic reactions have negative deltaG values and endothermic have positive deltaG values. Hope this ...
by Alan Cornejo 1a
Sun Mar 15, 2020 7:58 am
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: Examples Expected to Know
Replies: 10
Views: 379

Re: Examples Expected to Know

A typical rule of thumb is to just be aware of the biological examples he gave in lectures, any other examples that he doesnt mention we wont need to memorize or know specifically.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:53 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm 6B
Replies: 3
Views: 95

Re: Midterm 6B

For this question since the answer choice a has reactants and products all as solids in the same phase, there will be almost not entropy change.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:51 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Differences
Replies: 5
Views: 157

Re: Differences

An open system is a system that freely exchanges energy and matter with its surroundings. A closed system is a system that exchanges only energy with its surroundings, not matter.An isolated system does not exchange energy or matter with its surroundings.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:49 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system Drawing
Replies: 2
Views: 88

Re: isolated system Drawing

An isolated system has energy that remains constant, and is exposed to a constant pressure
by Alan Cornejo 1a
Sun Mar 15, 2020 7:46 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess Law
Replies: 2
Views: 70

Re: Hess Law

ayushibanerjee06 wrote:Yes you add all of them up at the end. If you reverse a reaction, it is negative. You multiply/divide H by whatever you manipulate the reaction. Remember that you can do this because enthalpy is a state function!


This is correct thank you for the clarification.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:45 am
Forum: Phase Changes & Related Calculations
Topic: Negative Work
Replies: 18
Views: 301

Re: Negative Work

When work is done b the system against the surrounding the value is negative. When work is being done ON the system by the surrounding such as an increasing external pressure, then work is positive.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:43 am
Forum: Phase Changes & Related Calculations
Topic: expansion
Replies: 5
Views: 107

Re: expansion

Expansion can be determined if work is done by the system at a constant pressure, so we find that the system expanded against the external pressure.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:41 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Extensive and Intensive Properties
Replies: 12
Views: 221

Re: Extensive and Intensive Properties

Manav Govil 1B wrote:I used https://www.thoughtco.com/intensive-vs- ... ies-604133 when I was studying for my exam.


Thank you for the link, it was very hepful
by Alan Cornejo 1a
Sun Mar 15, 2020 7:40 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: calorimetry
Replies: 6
Views: 106

Re: calorimetry

Regular calorimeters is done using a constant pressure, while the difference in bomb calorimeters is that they are done at constant volume.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:38 am
Forum: Ideal Gases
Topic: When to use equation
Replies: 9
Views: 176

Re: When to use equation

For the ideal gas law it shoudlnt be used for that intended purpose, but for the issue you propose it would be suggested to using the m1v1= m2v2 equation
by Alan Cornejo 1a
Sun Mar 15, 2020 7:34 am
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 512

Re: Kc vs Kp

Kp is used in the event that you products and reactants all exists in a gas phase. Therefore we use the partial pressures of the gases and make sure the units we use as a result also take that into inclusion. For Kc we use that when we are trying to determine concentration rather than the pressure.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:32 am
Forum: Ideal Gases
Topic: Partial Pressure
Replies: 13
Views: 142

Re: Partial Pressure

When decreasing the volume of a reaction, you also increase the pressure. Using le chatliers principle we find the reaction will shift towards the side that has fewer moles of gas, which in this reaction is the products as there are only 2 mols of gas compared to three on the reactants side.
by Alan Cornejo 1a
Sun Mar 15, 2020 7:28 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Delta S
Replies: 8
Views: 127

Re: Delta S

The total enthropy is described using the equation total entropy is equal to the entropy of the system and surrounding added to eachother. For tempurature change including entropy we use the equation, deltaG = deltaH - T*deltaS, if our value of deltaG is negative then our reaction is spontaneous, if...
by Alan Cornejo 1a
Sun Mar 15, 2020 7:23 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat released/ gained
Replies: 4
Views: 96

Re: Heat released/ gained

In order for a bond to break there must have a source of energy to break that bond, and so with the formation of bonds because is typically an exothermic reaction, heat is released
by Alan Cornejo 1a
Sun Mar 15, 2020 7:19 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: q=H
Replies: 4
Views: 116

Re: q=H

Delta H is equal to q when no work is done onto a system, such as a constant pressure
by Alan Cornejo 1a
Sun Mar 15, 2020 7:15 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy and Heat
Replies: 4
Views: 101

Re: Enthalpy and Heat

Enthalpy (ΔH) is the measure of heat released or absorbed at a constant pressure. q is just heat under any conditions. ΔH would be equal to q only when the heat is released or absorbed at a constant pressure. This is the correct answer, another way to think about it is that you can use the two term...
by Alan Cornejo 1a
Sun Mar 15, 2020 7:11 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: calculating delta H for an expansion
Replies: 3
Views: 106

Re: calculating delta H for an expansion

You can find the enthalpy by using the standard enthalpies of formation in the back of the textbook. Use equation deltaH = sum of deltaH products - sum of deltaH reactants to find the delta H value. Also a reminder that when using the sum of the deltaH products and reactant it is important to recog...
by Alan Cornejo 1a
Sun Mar 15, 2020 7:08 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Midterm Q6B
Replies: 5
Views: 123

Re: Midterm Q6B

The answer is A because we first realize that chnage in gibbs free energy is equal to the change in enthalpy subracted by the product of temperature and the change in entropy or, ∆G= ∆H-T∆S. We also know that ∆G= ∆H when ∆S is approximately 0. Because answer choice has reactants and products all in ...
by Alan Cornejo 1a
Sun Mar 15, 2020 7:04 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Midterm 3B
Replies: 1
Views: 73

Re: Midterm 3B

answer choice B is the most concentrated solution thus consisting of the least amount of water of the answer choices. Because water has a high specific heat capacity, meaning it takes more energy to heat, if we want to have the highest temperature change, it would be ideal if we can limit as much wa...
by Alan Cornejo 1a
Sun Mar 15, 2020 6:58 am
Forum: Ideal Gases
Topic: T variable in pv=nrt
Replies: 10
Views: 103

Re: T variable in pv=nrt

Using kelvin is most advisable as it is an easy conversion, and it allows for the matchup of all the right units for your equation.
by Alan Cornejo 1a
Sun Mar 15, 2020 6:56 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reaction Direction
Replies: 14
Views: 253

Re: Reaction Direction

One way to determine if the reaction will proceed right or left is by comparing to equilibrium value to the reaction quotient value. If your reaction quotient (Q) is less than K than your reactants will continue to react and your reaction will proceed to the right towards the products and vice versa...
by Alan Cornejo 1a
Sun Mar 15, 2020 6:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

I’m reading a chemistry book about helium.
I can’t put it down.
by Alan Cornejo 1a
Sun Mar 15, 2020 6:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

I know a guy who cooled himself to -273.15C.

He was 0k.
by Alan Cornejo 1a
Sun Mar 15, 2020 6:46 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Do you know a good chemistry joke?
No sorry, all of them argon
by Alan Cornejo 1a
Sun Mar 15, 2020 6:45 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Two atoms are walking down the street. Says one atom to the other, “Hey! I think I lost an electron!”
The other says, “Are you sure?”
“Yes, I’m positive!”
by Alan Cornejo 1a
Sun Mar 15, 2020 6:45 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

A neutron walks into a restaurant and orders a couple of drinks. As she is about to leave, she asks the waiter how much she owes. The waiter replies, “For you, No Charge!”
by Alan Cornejo 1a
Sun Mar 15, 2020 6:44 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Man: I wish I was the Enzyme DNA Helicase.
Woman: Why?
Man: So I could unzip your genes.
by Alan Cornejo 1a
Mon Feb 10, 2020 11:23 pm
Forum: Phase Changes & Related Calculations
Topic: Molar Internal Energy
Replies: 2
Views: 47

Re: Molar Internal Energy

Thank you
by Alan Cornejo 1a
Mon Feb 10, 2020 8:00 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible or Irreversible
Replies: 5
Views: 51

Re: Reversible or Irreversible

Yes we would assume it is reversible as most chemical reactions are reversible, usually from the context you can infer from the question such as it stating that the pressure is constant or not constant,
by Alan Cornejo 1a
Mon Feb 10, 2020 7:49 pm
Forum: Phase Changes & Related Calculations
Topic: Molar Internal Energy
Replies: 2
Views: 47

Molar Internal Energy

Does anybody know if the midterm will be covering molar internal energy with the likeliness of translational and rotational energy ?
by Alan Cornejo 1a
Sun Dec 08, 2019 11:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Representing larger molecules
Replies: 4
Views: 151

Re: Representing larger molecules

The atom thats least electronegative should be the central atom, if you have two I would assume it would be best to create the shape by simply drawing the structure according to the appearance in the chemical formula.
by Alan Cornejo 1a
Sun Dec 08, 2019 11:44 pm
Forum: Hybridization
Topic: Charges
Replies: 5
Views: 418

Re: Charges

If the molecule or atom has a negative or positive charge it is best to portray so, if it is neutral there is really no need.
by Alan Cornejo 1a
Sun Dec 08, 2019 11:42 pm
Forum: Naming
Topic: ion at end of name
Replies: 4
Views: 121

Re: ion at end of name

405268063 wrote:Yup, if there are no cations or anions attached to it, you also add "ion" at the end of the name.


THis is correct, if not cations or anions seem to from with it, the ion name will be added
by Alan Cornejo 1a
Sun Dec 08, 2019 11:39 pm
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 2
Views: 152

Re: Lewis Structures

the least electronegative atom is typically the central molecule. hydrogens will always be on the outside since they can only form one bond. make sure to know specific trends (such as how carbon always wants to make 4 bonds to keep the FC at 0) This is correct, usually the atom thats least electron...
by Alan Cornejo 1a
Sun Dec 08, 2019 11:37 pm
Forum: Lewis Structures
Topic: Cl as a central atom
Replies: 5
Views: 254

Re: Cl as a central atom

Chlorine is one of the few atoms of which can also break the octet rule allowing it to expand its shells and hold more than 8 electrons
by Alan Cornejo 1a
Sun Dec 08, 2019 11:35 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Vs Pi
Replies: 10
Views: 217

Re: Sigma Vs Pi

Pi bonds occur with double bonded or triple bonded atoms, while sigma bonds occur with single bonds. Sigma bonds are going to be weaker and longer bonds than a pi bond.
by Alan Cornejo 1a
Sun Dec 08, 2019 11:09 pm
Forum: Properties of Light
Topic: speed of light and protons
Replies: 3
Views: 155

Re: speed of light and protons

For the simple fact that protons of mass, they cannot reach the speed of light, objects with mass cannot travel at the speed of light
by Alan Cornejo 1a
Sun Dec 08, 2019 11:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

Helium walks into a bar,
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.
by Alan Cornejo 1a
Sun Dec 08, 2019 11:02 pm
Forum: General Science Questions
Topic: Curve
Replies: 9
Views: 341

Re: Curve

In order to pass the class you need at least 250/500 points to pass with a C-. The rest of the grades as far as A's and B's I believe will be graded on a curve dependent on the overall/average score of students.
by Alan Cornejo 1a
Sun Dec 08, 2019 10:58 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 133
Views: 33562

Re: Final Jitters

Being able to be in a relaxed state of mind is the best thing you can do for your self, this can be done through reviewing days ahead in advance to avoid cramming and using the last day to do an easy guide over and to relax and have fun, as having fun and laughing is proven to enhance neural pathway...
by Alan Cornejo 1a
Sat Dec 07, 2019 10:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 3722

Re: Rydberg equation [ENDORSED]

Can someone help me understand why we use the Rydberg equation? The Rydberg equation is used to calculate the energy of an electron at a certain principle quantum level of an atom. We'll usually use it in problems where we're asked to calculate the change in energy, frequency, or velocity that occu...
by Alan Cornejo 1a
Sat Dec 07, 2019 10:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarizability
Replies: 4
Views: 154

Re: polarizability

London dispersion forces are weaker than the other intermolecular forces and therefore does not exert high polarizability
by Alan Cornejo 1a
Sat Dec 07, 2019 9:55 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates
Replies: 5
Views: 176

Re: Chelates

You would look for ligands that act as polydentate. For example, if the coordination compound has ethylenediamine or en, you would know that it is chelating since en is a bidentate. This is correct, as long as you identify the ligands that have two or more atoms capable of binding to a central meta...
by Alan Cornejo 1a
Sat Dec 07, 2019 9:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand polydentate
Replies: 4
Views: 132

Re: Ligand polydentate

I'm not entirely sure, but I think it depends on the lone pairs within a molecule. Like water is a monodentate because it can only bond through oxygen which has 2 sets of lone pairs. With en (ethylenediamine) since it has multiple nitrogens with lone pairs, it is able to bond through multiple site,...
by Alan Cornejo 1a
Sat Dec 07, 2019 9:47 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelating ligands [ENDORSED]
Replies: 21
Views: 6235

Re: chelating ligands [ENDORSED]

Angela Prince 3B wrote:
Elizabeth Harty 3A wrote:How do you know if there are sigma bonds available for rotation?


all sigma bonds can rotate, but pi bonds cannot


Thank you for the clarification .
by Alan Cornejo 1a
Sat Dec 07, 2019 9:45 pm
Forum: Lewis Structures
Topic: Expanded Octets
Replies: 2
Views: 120

Expanded Octets

I know that atoms in group 3 can break the octet rule, but I have also seen similarly that even atoms like Cl can break the octet rule, Is there any other atoms outside of group 3, that can also break the octet rule, and if so is there a certain way to identify why exactly they are able to break the...
by Alan Cornejo 1a
Sat Dec 07, 2019 9:41 pm
Forum: Lewis Structures
Topic: Bent or Angular?
Replies: 16
Views: 341

Re: Bent or Angular?

Jamie Lee 1D wrote:Technically they are the same thing so I don't think it matters, you would most likely get a problem correct with either name. Lavelle used bent in his lecture though.


Both terms usually refer to the same thing, correct.
by Alan Cornejo 1a
Sat Dec 07, 2019 9:39 pm
Forum: Lewis Structures
Topic: Lewis for carbon monoxide
Replies: 3
Views: 236

Re: Lewis for carbon monoxide

Carbon Monoxide has a total of 10 valence electrons. Carbon having four and Oxygen having six they combine to have 10 total valence electrons. If the carbon and oxygen were double bonded (4 shared electrons), and each had a single pair then you would only have a total of 8 valence electrons. 1 lone ...
by Alan Cornejo 1a
Sat Dec 07, 2019 9:32 pm
Forum: Octet Exceptions
Topic: Octet exception
Replies: 13
Views: 455

Re: Octet exception

Elements in the 3p or higher orbital are exceptions to the octet rule. This is because they have an empty d-orbital that allows them to hold more than 8 valence e-, e.g. for P, it is located in the 3p orbital, but has an empty 3d orbital that allows it to hold more than 8 e- and be an exception. Th...
by Alan Cornejo 1a
Sat Dec 07, 2019 9:29 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 15
Views: 373

Re: Sigma vs. Pi

zachary_nhem_4I wrote:Sigma bonds are stronger because the two orbitals overlap, as opposed to a pi bond where the two orbitals are side by side.


This response is correct as the overlapping of two P orbitals causes the stronger force.
by Alan Cornejo 1a
Sat Dec 07, 2019 9:26 pm
Forum: Sigma & Pi Bonds
Topic: pi bonds
Replies: 5
Views: 177

Re: pi bonds

Yes any single bond has one sigma bond, a double bond has one sigma and two pi bonds, and a triple bond has 1 pi and two sigma bonds
by Alan Cornejo 1a
Wed Dec 04, 2019 6:26 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 19
Views: 438

Re: sigma and pi bonds

Yes all single bonds are sigma bonds, and double bonds contain one sigma and one pi bond, and a triple bond contains 2 pi bonds and one sigma.
by Alan Cornejo 1a
Wed Dec 04, 2019 6:24 pm
Forum: Administrative Questions and Class Announcements
Topic: How to list Chem_Mod posts
Replies: 15
Views: 39844

Re: How to list Chem_Mod posts

Thanks for the help !
by Alan Cornejo 1a
Wed Dec 04, 2019 6:23 pm
Forum: Student Social/Study Group
Topic: Finals Preparation
Replies: 7
Views: 145

Re: Finals Preparation

I think that a good night's sleep is pretty important too. I'd suggest to not stay up super late cramming because that can limit your ability to perform on the test due to lack of sleep. Yeah I've read about how sleep can inhibit cognitive abilities by over 60% over just one bad nights sleep. Thanks
by Alan Cornejo 1a
Wed Dec 04, 2019 6:21 pm
Forum: Student Social/Study Group
Topic: Week 10 Chemistry Community
Replies: 9
Views: 329

Re: Week 10 Chemistry Community

Sunday is the deadline and we must have 50 posts
by Alan Cornejo 1a
Wed Dec 04, 2019 6:19 pm
Forum: Student Social/Study Group
Topic: Practice Final
Replies: 17
Views: 586

Re: Practice Final

If you search for "marshmallow" you will find past exam problems for review
by Alan Cornejo 1a
Wed Dec 04, 2019 6:18 pm
Forum: Student Social/Study Group
Topic: Grades
Replies: 14
Views: 406

Re: Grades

On the syllabus it says a 50% is needed to pass with a C- or higher and so I assume thats a curve in and of itself
by Alan Cornejo 1a
Wed Dec 04, 2019 6:16 pm
Forum: Student Social/Study Group
Topic: Preparing for the final
Replies: 25
Views: 342

Re: Preparing for the final

I really feel like going to the review sessions helps alot as it helped me greatly and they are very useful
by Alan Cornejo 1a
Wed Dec 04, 2019 6:13 pm
Forum: Student Social/Study Group
Topic: Finals Preparation
Replies: 7
Views: 145

Re: Finals Preperation

ramiro_romero wrote:Just make sure you eat an apple, glucose molecules will store in your body and fuel your brain ability!

Thats a great idea, thanks for the advice.
by Alan Cornejo 1a
Wed Dec 04, 2019 6:10 pm
Forum: Student Social/Study Group
Topic: Finals Preparation
Replies: 7
Views: 145

Finals Preparation

Any thoughts/advice as to the best nutritious and energizing breakfasts for sunday morning before the final ?
by Alan Cornejo 1a
Sun Oct 27, 2019 8:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

A conversation between two atoms:
I think I’ve lost an electron.
Are you sure?
Yeah, I’m positive.
by Alan Cornejo 1a
Sun Oct 27, 2019 8:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

My teacher threw Sodium Chloride at me. That’s a salt.
by Alan Cornejo 1a
Sun Oct 27, 2019 8:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

“What do you do with a sick chemist?”
“If you can’t helium, and you can’t curium, then you might as well barium.”
by Alan Cornejo 1a
Sun Oct 27, 2019 8:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408774

Re: Post All Chemistry Jokes Here

helium walks into a bar and orders a beer. The bartender says, “Sorry, we don’t serve noble gases here.” He doesn’t react
by Alan Cornejo 1a
Sun Oct 20, 2019 11:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 92
Views: 1850

Re: Advice for studying

Alexis 3F wrote:I've been attending the workshops a few times a week and it's made suchhhh a positive improvement!!!!


I also found this to be super helpful
by Alan Cornejo 1a
Sun Oct 20, 2019 11:10 pm
Forum: Properties of Electrons
Topic: Angstrom Conversion
Replies: 12
Views: 173

Re: Angstrom Conversion

905416023 wrote:It is 1 angstrom to 10^-10 m


correct answer
by Alan Cornejo 1a
Sun Oct 20, 2019 11:04 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 466

Re: What are the units of hertz

nicolely3B wrote:Hz is the unit for 1 cycle/second. The cycle refers to a wave's cycle and it's from the peak of one wave to the trough of the next



perfect explanation
by Alan Cornejo 1a
Sun Oct 20, 2019 10:59 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 147
Views: 104607

Re: Reading the textbook [ENDORSED]

reading the textbook is an obvious super helpful tool, to better go in depth as to what you are learning and practice.
by Alan Cornejo 1a
Sun Oct 20, 2019 10:57 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 9931

Re: Ionic vs Covalent

Typically, ionic bonds are stronger but there are exceptions such as weakened ionic bonds as water as well as special strengthened covalent bonds known as covalent network bonding.
by Alan Cornejo 1a
Sun Oct 13, 2019 10:04 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 147
Views: 104607

Re: Reading the textbook [ENDORSED]

I used these for my AP Chemistry class in high school, but I think they have some college-level chem as well: https://chem.libretexts.org/ https://www.youtube.com/channel/UCEWpbFLzoYGPfuWUMFPSaoA https://www.youtube.com/watch?v=IFKnq9QM6_A&list=PLJfwA7_CzYE_qLSXH2hJkpffcrc76NjHJ Hope this helps...
by Alan Cornejo 1a
Sun Oct 13, 2019 10:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 31
Views: 1446

Re: Wavelength Plausibility

madeleine_dis1E wrote:Yes, the 700-400nm example he gave is meant to provide a mental picture of the range however the actual scale is from 720-400. Either way you want to remember it is ok.


correct, 700 is just used for an easier conceptualization of the actual range
by Alan Cornejo 1a
Sun Oct 13, 2019 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 53
Views: 3417

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

great tool and resource to help review and further cement the fundamentals of each topic covered in class !
by Alan Cornejo 1a
Sun Oct 13, 2019 9:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

You have the option of either doing more problems from week 1 of Chem review or the quantam world
by Alan Cornejo 1a
Sun Oct 13, 2019 9:38 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 5095

Re: Test 1 [ENDORSED]

I don't know if someone has asked this already but would we get partial credit for unfinished problems headed in the right direction? I was also wondering this as, I was also curious as to how far off of an answer would grant us the maximum amount of points ie. our answer is 8.4 whereas the actual ...
by Alan Cornejo 1a
Sun Oct 06, 2019 10:13 pm
Forum: Limiting Reactant Calculations
Topic: Steps to Finding the Limiting Reactant
Replies: 3
Views: 79

Re: Steps to Finding the Limiting Reactant

You only need to use the molar mass of one reactant to find the product, so you can keep the molar masses of the products separated. First, convert the grams given of a particular reactant to moles. Then, use the molar ratio of the balanced equation to determine how much of a particular product is ...
by Alan Cornejo 1a
Sun Oct 06, 2019 10:07 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical vs. Actual Yield
Replies: 38
Views: 3399

Re: Theoretical vs. Actual Yield

Actual yields will be less than theoretical yields due to side reactions that can occur, some products could stick to the sides of the reaction container, and impurities that are bound to happen during almost all chemical reactions. Hope this was helpful/answered your question! exactly ! There are ...
by Alan Cornejo 1a
Sun Oct 06, 2019 10:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 177
Views: 13465

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

Great and awesome to hear that you still think about and take time to give advice to students of a teacher you had so long ago. We all appreciate the advice and good luck to you and all your endeavours .
by Alan Cornejo 1a
Sun Oct 06, 2019 9:58 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 133
Views: 33562

Re: Final Jitters

I think the best way to relax and get rid of the nerves is to just close your eyes and breathe, just focus on good and positive memories and experiences will enhance your mood making you happier, the happier you are the more willing you are to focus and do something, it will also help clear your min...
by Alan Cornejo 1a
Sun Oct 06, 2019 9:53 pm
Forum: SI Units, Unit Conversions
Topic: Sig Fig Mistakes
Replies: 17
Views: 311

Re: Sig Fig Mistakes

Typically the amount of significant figures used for your answer is determined by the amount gaven to you in the question. Usually it follows these rules
any non-zero digits are always significant.
Any zeros between two significant digits are still significant.

Go to advanced search