Search found 62 matches

by Desiree1G
Sun Mar 17, 2019 7:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade Release Date?
Replies: 7
Views: 98

Re: Final Grade Release Date?

Also when can we pick up the exams next quarter?
by Desiree1G
Sat Mar 16, 2019 10:35 am
Forum: Student Social/Study Group
Topic: Lyndon's Review Session
Replies: 8
Views: 231

Re: Lyndon's Review Session

Has the worksheet been posted?
by Desiree1G
Sat Mar 16, 2019 10:10 am
Forum: Student Social/Study Group
Topic: class pictures
Replies: 15
Views: 671

Re: class pictures

one more
by Desiree1G
Sat Mar 16, 2019 10:10 am
Forum: Student Social/Study Group
Topic: class pictures
Replies: 15
Views: 671

Re: class pictures

Here are some more pictures:)
by Desiree1G
Fri Mar 15, 2019 9:04 am
Forum: General Rate Laws
Topic: Elementary steps
Replies: 1
Views: 14

Re: Elementary steps

Adding on to their question ^ does it, in that case, mean the coefficient in the rate law is not 1/x but just 1?
by Desiree1G
Fri Mar 15, 2019 9:02 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate constants at equilibrium
Replies: 5
Views: 30

Re: Rate constants at equilibrium

No it depends on your Big K = to small k 1 over small k -1.
by Desiree1G
Fri Mar 15, 2019 9:01 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Specific Heat Capacity and Heat Capacity
Replies: 2
Views: 26

Re: Specific Heat Capacity and Heat Capacity

Remember Specific Heat Capacity is m*delta T*C and it is, in fact, an intensive property because no matter how much of something there is, its ability to absorb heat at the particular temperature is the same.
by Desiree1G
Wed Feb 27, 2019 9:59 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Problem 14.15c 6th edition
Replies: 1
Views: 38

Re: Problem 14.15c 6th edition

I'm really confused by this one too because of the KOH and Ni in the cell diagram :/
by Desiree1G
Wed Feb 27, 2019 9:45 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams in 14.15 and 14.17 6th Ed
Replies: 4
Views: 57

Re: Cell Diagrams in 14.15 and 14.17 6th Ed

Solutions of the same phase are separated by a comma and arranged in the oxidized, reduced order
by Desiree1G
Wed Feb 27, 2019 9:23 am
Forum: Balancing Redox Reactions
Topic: 14.15a
Replies: 3
Views: 165

Re: 14.15a

I am confused on this too but essentially I think it is because the oxidation number for Bromine do not change.
by Desiree1G
Sun Feb 24, 2019 2:56 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 9
Views: 95

Re: Test 2

In addition to what some classmates said, we should also know enthalpy and entropy because they are part of a Gibbs equation.
by Desiree1G
Sun Feb 24, 2019 2:27 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity
Replies: 8
Views: 84

Re: Spontaneity

If Gibbs is at 0 it is at equilibrium, if it is negative then it is exergonic meaning it is also spontaneous. If it is positive it is endergonic which means it is non-spontaneous. The lower the delta G is the more stable it is.
by Desiree1G
Sun Feb 24, 2019 2:25 pm
Forum: Balancing Redox Reactions
Topic: difference between oxidation and reduction
Replies: 8
Views: 62

Re: difference between oxidation and reduction

OIL RIGS helps me remember that when Oxidation happens it Loses Electrons. When Reduction happens it Gains electrons. It is oxidation because it lost two electrons therefore increasing it's positive charge.
by Desiree1G
Sun Feb 24, 2019 2:23 pm
Forum: Balancing Redox Reactions
Topic: Test 2 Material
Replies: 13
Views: 120

Re: Test 2 Material

Gibbs free energy for sure and some electrochemistry is possible. I'm not sure how much:/
by Desiree1G
Sun Feb 24, 2019 2:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs energy
Replies: 2
Views: 31

Re: Gibbs energy

Delta G^0 is for standard conditions such as standard temperature (25 degrees celcius/298K). Delta G is for nonstandard conditions and depends on those, this means temperature, for instance, is not standard.
by Desiree1G
Fri Feb 22, 2019 9:30 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Equations of delta G
Replies: 4
Views: 52

Re: Equations of delta G

It is usually based on your givens and if you have enthalpy then most likely the first one will be used. It helps to check off what you have and see what you can plug in.
by Desiree1G
Fri Feb 22, 2019 9:27 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G=0 at equilibrium
Replies: 4
Views: 56

Re: Delta G=0 at equilibrium

When Gibbs free energy is equal to 0 that means that the reaction is at equilibrium meaning that no more work can be done.
by Desiree1G
Fri Feb 22, 2019 9:25 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isochoric
Replies: 3
Views: 50

Re: Isochoric

That is also another way of saying it is isometric which means volume is constant
by Desiree1G
Fri Feb 22, 2019 9:24 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free energy
Replies: 5
Views: 58

Re: Gibbs Free energy

Standard temperature is 25 degrees celcius, however for Gibbs free energy we always use Kelvin so it is 273+25 which is 298 K
by Desiree1G
Thu Feb 21, 2019 12:11 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs concept
Replies: 7
Views: 80

Re: Gibbs concept

Gibbs is the amount of useable free energy. So this is the total change in the energy minus the temperature times the total change in disorder of the system.
by Desiree1G
Thu Feb 21, 2019 12:09 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G a state function?
Replies: 23
Views: 189

Re: Delta G a state function?

Yes and I remember because Lyndon said once he was "Feeling a little Pressured and Dense. He wished he could just watch TV and get HUGS.
(PV TV HUGS).
by Desiree1G
Thu Feb 21, 2019 12:07 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Systems
Replies: 6
Views: 101

Re: Systems

Open you can think of it as if something can fall out of it, hence it can exchange heat and matter. Like a plant, it is exposed. Closed well nothing can fall out, but heat can still be exchanged. Isolated nothing is exchanged because it is isolated away from everything.
by Desiree1G
Thu Feb 21, 2019 12:05 am
Forum: Balancing Redox Reactions
Topic: H+ vs H3O+
Replies: 10
Views: 76

Re: H+ vs H3O+

Some people say to use H+, and I'm not sure if it's the same as with acids and bases because during that time using either one was fine.
by Desiree1G
Thu Feb 21, 2019 12:04 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: When does delta U equal zero?
Replies: 17
Views: 207

Re: When does delta U equal zero?

When the reactions says it is isothermal that means that the temperature is constant (iso=same). If this is the case then there is no change in the internal energy therefore U is 0.
by Desiree1G
Thu Feb 21, 2019 12:02 am
Forum: Ideal Gases
Topic: units
Replies: 15
Views: 114

Re: units

Yes remember K does not have a unit because it is a ration and I believe those units cancel out.
by Desiree1G
Thu Feb 21, 2019 12:01 am
Forum: Balancing Redox Reactions
Topic: Week 7 Homework
Replies: 15
Views: 106

Re: Week 7 Homework

Most likely Gibbs and maybe some electrochemistry, but mostly Gibbs.
by Desiree1G
Wed Feb 20, 2019 11:59 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: entropy
Replies: 4
Views: 45

Re: entropy

Enthalpy is the delta H and Entropy is the delta S. Basically Enthalpy is the total energy in the system and entropy is the measure of disorder. Also, note that the second law of thermodynamics shows that disorder is increasing.
by Desiree1G
Tue Feb 12, 2019 12:01 am
Forum: Student Social/Study Group
Topic: Too cute
Replies: 5
Views: 471

Re: Too cute

I'm new to uploading videos apparently, so hopefully, this video of the acapella performance uploaded below in the attachments...
by Desiree1G
Mon Feb 11, 2019 6:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
Replies: 49
Views: 2322

Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!

Thank you, I had such a hard time finding it haha!
by Desiree1G
Thu Feb 07, 2019 3:01 pm
Forum: Ideal Gases
Topic: Lyndon's review session
Replies: 7
Views: 198

Re: Lyndon's review session

It's from 7-10 on Monday Franz 1178. I cannot find the worksheet either :(
by Desiree1G
Tue Jan 22, 2019 10:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ice chart
Replies: 7
Views: 96

Re: ice chart

Typically the problems provide initial molarity or ask for you to calculate the molarity or initial values. I is for initial molarity, C is for change, and E is for equilibrium concentration
by Desiree1G
Tue Jan 22, 2019 10:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong acids and bases
Replies: 6
Views: 76

Re: Strong acids and bases

I believe it is best to memorize some for strong acids and bases. I do not remember which ones, but I think the ones common in homework are good to know.
by Desiree1G
Sat Dec 08, 2018 6:31 pm
Forum: Naming
Topic: Common Ligands
Replies: 2
Views: 34

Re: Common Ligands

I would know them, better safe than sorry. Maybe more the ones that we saw in the homework probs too.
by Desiree1G
Sat Dec 08, 2018 6:26 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: HOCl vs HOI
Replies: 9
Views: 140

Re: HOCl vs HOI

Electronegativity is the tendency of an atom to attract a bonding pair of electrons and Cl is more electronegative than I. The weaker the bond the more likely it will lose an H+. Also HOCL is more stable.
by Desiree1G
Sat Dec 08, 2018 6:21 pm
Forum: Biological Examples
Topic: Chemotherapy Drugs
Replies: 1
Views: 31

Re: Chemotherapy Drugs

Cisplatin is one that comes to mind because it stops cell division
by Desiree1G
Sat Dec 08, 2018 6:17 pm
Forum: Lewis Acids & Bases
Topic: Trends of Acids and Bases
Replies: 2
Views: 53

Re: Trends of Acids and Bases

Typically we compare A-H bonds with other bonds like that and the oxoacids (AO-H) bonds with others like it.
by Desiree1G
Sat Dec 08, 2018 6:15 pm
Forum: Hybridization
Topic: Power
Replies: 1
Views: 40

Re: Power

Hi, if you are referring to the 2 after C then that is the level it is on and it is not a power. If it is the 2 after the P then that is a power. Yes you should write this when writing the sigma bonds.
by Desiree1G
Sat Dec 08, 2018 6:12 pm
Forum: Bronsted Acids & Bases
Topic: H vs OH
Replies: 3
Views: 62

Re: H vs OH

The longer the A-H bond the easier it is to remove the H+. With AO-H bond the more electronegative the central atom the more acidic the molecule will become.
by Desiree1G
Sat Dec 08, 2018 6:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: radical
Replies: 5
Views: 99

Re: radical

Radicals have at least one unpaired electron and they have an odd number of valence electrons. Note they're also very reactive
by Desiree1G
Sun Dec 02, 2018 5:55 pm
Forum: Coordinate Covalent Bonds
Topic: Identifying Polydentates
Replies: 4
Views: 63

Re: Identifying Polydentates

I'm not sure if this is 100% for certain but I think there is a few we just sort of have to remember are polydentate, for instance, en, ethylenediamine or dien, diethylenetriamine. But I doubt he will give us some that we have not reviewed
by Desiree1G
Sun Dec 02, 2018 5:48 pm
Forum: Naming
Topic: 6th Edition Ch 17.5 #31 b and d
Replies: 1
Views: 38

Re: 6th Edition Ch 17.5 #31 b and d

Okay so the 3/III, as I learned, is the oxidation number, so basically for b) if you calculate the oxidation number NH3 and OH2 are neutral meaning they are 0 and add that to cobalt which was "unknown" it will equal 3 because your oxidation number is 3. Essentially, I would write it like t...
by Desiree1G
Sun Dec 02, 2018 5:35 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Transition Metals
Replies: 5
Views: 134

Re: Transition Metals

Transition metals are capable of adopting ions with different charges because in mind they are in the d-block so they one or more unpaired electrons in one of their ions.
by Desiree1G
Sun Dec 02, 2018 4:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation number
Replies: 3
Views: 61

Re: Oxidation number

I'll do an example so hopefully, it makes more sense. Take for instance, [Fe(CN)6]^(4-) --hexacyanoferrate (II) ion (note 6 is a subscript). Note that transition metals charge vary. I usually start by putting an X to represent "unknown" for my metal which is Fe. So, I have: X+(-1)6= -4. Th...
by Desiree1G
Sun Dec 02, 2018 4:06 pm
Forum: Naming
Topic: Order of Ligands
Replies: 2
Views: 53

Re: Order of Ligands

I recall it was supposed to be in alphabetical order, so in that case your first one would be correct.
by Desiree1G
Sun Dec 02, 2018 4:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates: are the rings a part of the coordination sphere?
Replies: 2
Views: 47

Re: Chelates: are the rings a part of the coordination sphere?

I do believe so because the coordination sphere consists of the central ion or atom along with all the ligands.
by Desiree1G
Sun Dec 02, 2018 3:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to determine coordination number
Replies: 3
Views: 51

Re: How to determine coordination number

Coordination number I know as simply the number of bonds used to attach to all ligands.
by Desiree1G
Sun Nov 25, 2018 6:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Arrangement vs. Molecular Shape
Replies: 2
Views: 55

Re: Electron Arrangement vs. Molecular Shape

Hi, so I had had the same question, but I learned that electron arrangement basically means all the electron densities around the atom. In other words, all the stuff around it so that could be the other element(s) and any lone pair of electrons, (this is the steric number.) Once you have this, you l...
by Desiree1G
Sun Nov 25, 2018 6:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs pi bonds
Replies: 7
Views: 72

Re: Sigma vs pi bonds

A sigma bond is the strongest type of covalent chemical bond. A pi bond contains p-p orbitals and it is a covalent bond formed by the side to side overlap of orbitals, which can be easily broken. Also, a single bond consists of a sigma bond, and let's say you have a double bond, this consists of a s...
by Desiree1G
Sun Nov 25, 2018 6:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3 material
Replies: 6
Views: 90

Re: Test 3 material

I have a feeling it will cover things we have been over since after the midterm and probably a bit from before, such as VSEPR models, knowing molecular shape and structure names, and polarity. There may be some stuff from this week that could potentially be there.
by Desiree1G
Sun Nov 18, 2018 8:58 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing structures
Replies: 8
Views: 127

Re: Drawing structures

I can't say I'm positive, but I don't think we will worry about that for VSPER in Chem 14 a. However, I think it is important for when you draw your Lewis structure though :)
by Desiree1G
Fri Nov 16, 2018 4:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: tetrahedral vs trigonal planar
Replies: 9
Views: 90

Re: tetrahedral vs trigonal planar

So what helps best is to draw the Lewis structure of the compound. So you have your central atom and typically the other surrounding atoms. If there are no lone pairs and it has 4 surrounding atoms it is tetrahedral (tetra=4). However, if it is trigonal planar (tri=3) then it only has 3 surrounding ...
by Desiree1G
Fri Nov 16, 2018 4:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Planar vs Pyramidal
Replies: 5
Views: 80

Re: Planar vs Pyramidal

Yes, there is a difference. So trigonal pyramidal has a pyramid shape and if you can try to imagine it with a base in a triangular shape. (it may be helpful to look for a 3D image). Also, t's bond angles are slightly less than 109 degrees and this is because it has one lone pair of electrons that ca...
by Desiree1G
Sat Nov 10, 2018 6:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 4
Views: 52

Re: Lone Pairs

I believe the shape/angle change has to do with electron repulsion. (This is important because it determines if something is polar or nonpolar.) I also read online that lone pairs occupy more space compared to bonding pairs of electrons, hence this results in greater repulsion between lone pairs of ...
by Desiree1G
Sat Nov 10, 2018 5:57 pm
Forum: Resonance Structures
Topic: Bond Lengths
Replies: 6
Views: 156

Re: Bond Lengths

Can someone explain bond lengths, I understand the whole single bond is weaker...but what are the most important things for us to know about them?
by Desiree1G
Sat Nov 10, 2018 5:54 pm
Forum: Ionic & Covalent Bonds
Topic: Relation between strong acid and weak bond
Replies: 3
Views: 34

Re: Relation between strong acid and weak bond

I believe you already know, but keep in mind a single bond the weakest bond, and a triple bond is strongest. I think HI is a stronger acid because the bond is weak which means it can be broken easily. Also, acids want to take in more electrons and considering the single bond is a weaker bond it will...
by Desiree1G
Thu Nov 01, 2018 8:29 pm
Forum: Sigma & Pi Bonds
Topic: Easy way of remembering the difference
Replies: 6
Views: 116

Re: Easy way of remembering the difference

Between bonds, do you mean ionic and covalent? If you do, I usually look at the elements. If it has a metal in it, it is ionic because ionic bonds typically transfer one electron from a metal to a nonmetal. And if it has a positive charge it is a cation. This means it lost an electron hence making i...
by Desiree1G
Thu Nov 01, 2018 8:23 pm
Forum: Resonance Structures
Topic: Most Stable Configuration
Replies: 11
Views: 153

Re: Most Stable Configuration

The most stable configuration is one in which its formal charge would be 0. This can be determined with the formula V-(L+S/2), where v is the valence electrons, L is the lone pair of electrons and S is the shared electrons over 2.
by Desiree1G
Thu Nov 01, 2018 8:20 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 8
Views: 89

Re: Formal Charge

V is for valence electrons, L is for lone pair of electrons, and then S is for shared electrons. Don't forget also the formula V-(L+S/2)
by Desiree1G
Wed Oct 24, 2018 12:36 am
Forum: DeBroglie Equation
Topic: equation definition
Replies: 5
Views: 158

Re: equation definition

I believe the difference is that de Broglie's equation includes matter. Matter according to the de Broglie has wave-like behavior and this equation, therefore, is meant to include how to calculate the wavelength of an object of mass. The wave equation we worked with initally (c=wavelength*v) did not...
by Desiree1G
Wed Oct 17, 2018 11:32 pm
Forum: Einstein Equation
Topic: Numbers to memorize
Replies: 22
Views: 367

Re: Numbers to memorize

I think it is possible they may provide numbers we do not know for the test, however once we do practice problems I think you will memorize them. Currently the speed of light and plank's constant are ones we will gradually remember.
by Desiree1G
Wed Oct 17, 2018 11:26 pm
Forum: Photoelectric Effect
Topic: Definition for photoelectric effect
Replies: 4
Views: 56

Re: Definition for photoelectric effect

The definition that makes the most sense to me is, the ejection of electrons from the surface of a metal when exposed to UV radiation of frequency above the threshold frequency of the metal.
by Desiree1G
Wed Oct 17, 2018 11:22 pm
Forum: Properties of Light
Topic: Sig Figs in Problem 1.13 (6th Edition)
Replies: 5
Views: 74

Re: Sig Figs in Problem 1.13 (6th Edition)

I don't believe sig figs matter too much in this case, but I usually go with three in those cases. Verify with the TA

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