Search found 177 matches

by Charlotte Adams 1A
Sat Mar 13, 2021 6:12 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing Vs Reducing agent
Replies: 22
Views: 89

Re: Oxidizing Vs Reducing agent

YuditGaribay3J wrote:So when we are looking at oxidizing agents it is just the opposites of what we think it is. So normally I think of oxidizing as losing but it is actually gaining? and vise versa?

If you put it that way then yes.
by Charlotte Adams 1A
Sat Mar 13, 2021 6:10 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: "Thermodynamically Stable" vs "Kinetically Stable"
Replies: 10
Views: 88

Re: "Thermodynamically Stable" vs "Kinetically Stable"

If you have a reaction that has a negative gibbs free energy, but the reactant does not turn into the product, then the reactant is kinetically stable
by Charlotte Adams 1A
Sat Mar 13, 2021 6:08 pm
Forum: Calculating Work of Expansion
Topic: when is change in internal energy 0
Replies: 10
Views: 80

Re: when is change in internal energy 0

Change in internal energy is zero for an isolated system.
by Charlotte Adams 1A
Sat Mar 13, 2021 6:07 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: How to Easily Identify Amines
Replies: 1
Views: 71

Re: How to Easily Identify Amines

Amines contain a nitrogen atom with a lone pair.
by Charlotte Adams 1A
Sat Mar 13, 2021 6:06 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Sapling HW Week 9/10 #17
Replies: 9
Views: 55

Re: Sapling HW Week 9/10 #17

Kamille Kibria 2A wrote:im not sure if this diagram helps but this is what I did. you just add up the reverse delta H and activation of the forward reaction. we have different numbers but it's still the same concept

This is so helpful!! Thanks
by Charlotte Adams 1A
Sat Mar 13, 2021 6:03 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: How to find delta H of fusion
Replies: 3
Views: 38

Re: How to find delta H of fusion

I believe you are usually given the delta H of fusion or vaporization, at least thats how it was on the previous tests. Is this a book problem? Maybe you have to look at an appendix?
by Charlotte Adams 1A
Sat Mar 13, 2021 6:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Final jitters
Replies: 8
Views: 71

Re: Final jitters

You got this!!!Just keep reminding yourself that you have studied, that you are prepared, and it is just one test.
by Charlotte Adams 1A
Sun Mar 07, 2021 8:22 pm
Forum: Student Social/Study Group
Topic: Anxiety
Replies: 75
Views: 501

Re: Anxiety

There are some good meditation apps that have segments on test anxiety and school anxiety that I find helpful. Try the Calm app, its great!!
by Charlotte Adams 1A
Sun Mar 07, 2021 5:50 pm
Forum: Student Social/Study Group
Topic: How do you deal with burnout?
Replies: 124
Views: 455

Re: How do you deal with burnout?

I schedule my day in advance and make sure to at least give myself an hour of down time.
by Charlotte Adams 1A
Sun Mar 07, 2021 5:49 pm
Forum: General Rate Laws
Topic: Solving for time with 0/1/2 order rxns
Replies: 3
Views: 26

Re: Solving for time with 0/1/2 order rxns

I Know Lavelle derived them in class but I found the book to be really helpful for these equations.
by Charlotte Adams 1A
Sat Mar 06, 2021 10:36 am
Forum: Administrative Questions and Class Announcements
Topic: [CHEM 14B KARAOKE]
Replies: 68
Views: 2270

Re: [CHEM 14B KARAOKE]

Is it still from 2-4?
by Charlotte Adams 1A
Sat Mar 06, 2021 10:35 am
Forum: Administrative Questions and Class Announcements
Topic: [CHEM 14B KARAOKE]
Replies: 68
Views: 2270

Re: [CHEM 14B KARAOKE]

IM SO EXCITED
by Charlotte Adams 1A
Sat Mar 06, 2021 10:26 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Mechanism
Replies: 2
Views: 24

Re: Reaction Mechanism

Hello! The reaction mechanism as, Dr. Lavelle mentioned, is simply the number of steps that take place as reactants go to products. In regards to your second question, the overall rate law is determined by the slowest step, also known as the rate-determining step, because the other steps following t...
by Charlotte Adams 1A
Sat Feb 27, 2021 6:14 pm
Forum: Balancing Redox Reactions
Topic: Sapling #12
Replies: 3
Views: 36

Re: Sapling #12

No, you don't multiply by the stochio coefficients. Could you let me know your procedure for this question? I got E⁰ to be 3.878 using Red potential of Au3+ minus Red potential of Mg2+ = 1.498-(-2.38)=3.878 Keep in mind though that this question is asking you for delta G and not E⁰ Thanks for your ...
by Charlotte Adams 1A
Sat Feb 27, 2021 1:16 pm
Forum: Balancing Redox Reactions
Topic: Sapling #12
Replies: 3
Views: 36

Sapling #12

Could someone help me find the E∘cell of this eqn? I have tried it a couple times but have not been able to get it. Do I need to multiply by the stoich coefficients?

Thanks in adnavce
by Charlotte Adams 1A
Sat Feb 27, 2021 11:34 am
Forum: Balancing Redox Reactions
Topic: Sapling #5 Wk 7/8
Replies: 1
Views: 26

Sapling #5 Wk 7/8

When balancing a half reaction that is in a basic solution, should you balance the oxygen before the hydrogen? For example, how should I go about balancing the half reaction in the picture below?

Thanks in advance
by Charlotte Adams 1A
Fri Feb 26, 2021 11:55 am
Forum: Balancing Redox Reactions
Topic: Oxidizing Vs Reducing agent
Replies: 22
Views: 89

Oxidizing Vs Reducing agent

Can someone explain what a reducing agent does and what an oxidizing agent does? Also how do you know what is the reducing agent and what is the oxidizing agent when given a chem eqn?

Thanks
by Charlotte Adams 1A
Fri Feb 26, 2021 11:21 am
Forum: Balancing Redox Reactions
Topic: Sapling #5 Wk 7/8
Replies: 3
Views: 46

Sapling #5 Wk 7/8

Can someone tell me what I am missing for the balanced equation. I wrote the half reaction and added H2O and OH when I thought it was necessary but I think they cancel out, am I wrong?
by Charlotte Adams 1A
Wed Feb 24, 2021 5:16 pm
Forum: Balancing Redox Reactions
Topic: Sapling #1 Wk 7/8
Replies: 5
Views: 20

Re: Sapling #1 Wk 7/8

This problem is asking us to determine how the oxidation numbers have/haven't changed across the reaction. Starting with KClO2, we know that the oxidation number of O is 2- (from the periodic table) and that the oxidation number of K is +1 (from the periodic table). From that we can deduce an equat...
by Charlotte Adams 1A
Wed Feb 24, 2021 5:16 pm
Forum: Balancing Redox Reactions
Topic: Sapling #1 Wk 7/8
Replies: 5
Views: 20

Re: Sapling #1 Wk 7/8

There are a few rules that you can follow. First, any neutral element that is not a part of a compound (such as O2 in this problem) will always have an oxidation state of 0. Second, oxygen and hydrogen usually have oxidation states of -2 and +1, respectively, when attached to any compound. So for t...
by Charlotte Adams 1A
Wed Feb 24, 2021 10:40 am
Forum: Balancing Redox Reactions
Topic: Sapling #1 Wk 7/8
Replies: 5
Views: 20

Sapling #1 Wk 7/8

Hello, I know this is supposed to be a pretty easy question but could some one help me figure out the oxidation states for this problem and maybe explain how they figured it out? Thanks in advance.
by Charlotte Adams 1A
Wed Feb 24, 2021 10:38 am
Forum: Balancing Redox Reactions
Topic: Sapling #3 for Wk 7 and 8
Replies: 3
Views: 25

Re: Sapling #3 for Wk 7 and 8

steps #1-identify species being reduced/oxidized #2-write skeletal eqn. #3-balance all elements except O and H #4- basic solution=balance O by adding H20, then balance H by adding H2O and then add OH to other side #5-balance electrical charges by adding electrons where it is appropriate #6-multiply ...
by Charlotte Adams 1A
Sat Feb 20, 2021 2:23 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Textbook 4F.17
Replies: 4
Views: 29

Re: Textbook 4F.17

I thought the same thing but I think the book wants us to calculate the standard entropy as the water temp rises, calculate the entropy for the vaporization of water, then calculate the entropy for it to cool back down to 85 degrees. Basically, the book is just unclear in their directions
by Charlotte Adams 1A
Sat Feb 20, 2021 2:19 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When to put Pt(s) in a cell [ENDORSED]
Replies: 4
Views: 65

Re: When to put Pt(s) in a cell [ENDORSED]

Arya Adibi 1K wrote:As stated by Chem_Mod, Whenever a conducting electrode is needed, use Pt.

You would need a conducting electrode whenever either the reactants or products are aqueous and don't have a solid conductor.

Just to clarify, can a conducting electrode be an anode or a cathode?
by Charlotte Adams 1A
Sat Feb 20, 2021 2:16 pm
Forum: Calculating Work of Expansion
Topic: Work sign
Replies: 46
Views: 171

Re: Work sign

Think of the bicycle example from lecture. If we push air into bike, we are doing the work and the bike is gaining work.
by Charlotte Adams 1A
Sat Feb 20, 2021 2:15 pm
Forum: Balancing Redox Reactions
Topic: First Lecture Galvanic Cell
Replies: 7
Views: 57

Re: First Lecture Galvanic Cell

I think the solution is just aqueous
by Charlotte Adams 1A
Sat Feb 20, 2021 2:14 pm
Forum: Student Social/Study Group
Topic: Post Midterm 2 De-stressing
Replies: 92
Views: 546

Re: Post Midterm 2 De-stressing

I stayed up cleaning to destress.
by Charlotte Adams 1A
Sat Feb 20, 2021 2:13 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Thermodynamically Favorable
Replies: 27
Views: 78

Re: Thermodynamically Favorable

Thermodynamically Favorable just means that the gibbs free energy is negative
by Charlotte Adams 1A
Sat Feb 20, 2021 2:12 pm
Forum: Van't Hoff Equation
Topic: Application of Van't Hoff Equation
Replies: 11
Views: 78

Re: Application of Van't Hoff Equation

Its used to find the equilibrium constant at some temperature if we know the equilibrium constant for the same reaction but at a different temperature.
by Charlotte Adams 1A
Sat Feb 20, 2021 2:11 pm
Forum: Balancing Redox Reactions
Topic: Salt Bridges
Replies: 21
Views: 71

Re: Salt Bridges

Without the salt bridge the solution with the anode will become positive and then the electrons will not want to flow toward the cathode.
by Charlotte Adams 1A
Sat Feb 13, 2021 8:09 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Bomb Calorimeter
Replies: 17
Views: 59

Re: Bomb Calorimeter

LeanneBagood_2F wrote:wait what exactly are bomb calorimeters? has this mentioned in lecture before? if so, when/where and how solid should we be on this topic?

I believe it was mentioned in lecture 12 but it may have been lecture 11. I know its in one of the two.
by Charlotte Adams 1A
Fri Feb 12, 2021 1:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Sapling #14
Replies: 6
Views: 17

Re: Sapling #14

Try converting kelvins to degrees Celsius by subtracting 273.15
by Charlotte Adams 1A
Fri Feb 12, 2021 1:45 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Sapling Number 5
Replies: 8
Views: 42

Re: Sapling Number 5

use the formula ΔS=nCvln(T2/T1)
by Charlotte Adams 1A
Fri Feb 12, 2021 1:43 pm
Forum: Calculating Work of Expansion
Topic: Negative vs Positive Work
Replies: 13
Views: 71

Re: Negative vs Positive Work

Think of Lavelle's example of the bicycle pump. When the system is being compressed we are putting work into system so the system gains work.
by Charlotte Adams 1A
Fri Feb 12, 2021 1:41 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: lecture 16
Replies: 4
Views: 18

Re: lecture 16

Heather Costa 2C wrote:wait actually it just used to help find the temperature when it is unknown?


Yes, it helps us find the temperature that is needed for reaction to be either spontaneous or nonspontaneous
by Charlotte Adams 1A
Fri Feb 05, 2021 3:55 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: irreversible reactions calculated as reversible
Replies: 2
Views: 12

Re: irreversible reactions calculated as reversible

I am a little confused because for one of the sapling questions we had to calculate using the irreversible path equation and the reversible path equation.
by Charlotte Adams 1A
Fri Feb 05, 2021 3:53 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Sapling 15
Replies: 3
Views: 57

Re: Sapling 15

Use stoichiometry to find the moles of N2 and then plug into PV=nRT, also I think you will have to convert your final answers to joules.
by Charlotte Adams 1A
Fri Feb 05, 2021 3:40 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: "Reversible" Reaction
Replies: 5
Views: 65

Re: "Reversible" Reaction

It is called reversible because the process can be reversed by a a small change.
by Charlotte Adams 1A
Fri Feb 05, 2021 3:07 pm
Forum: Student Social/Study Group
Topic: Sapling HW and exams
Replies: 19
Views: 109

Re: Sapling HW and exams

I think sapling questions are useful and a good way to test your knowledge, especially because the solutions are right there and do a good job of describing how to solve the problem.
by Charlotte Adams 1A
Fri Feb 05, 2021 3:05 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 127
Views: 1043

Re: How to relax

I plan my entire day and put aside some time to relay at night. I have recently discovered that I enjoy painting and it calms me down.
by Charlotte Adams 1A
Fri Feb 05, 2021 3:04 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: How to find delt T when there's a transformation from an ice to liquid.
Replies: 3
Views: 25

Re: How to find delt T when there's a transformation from an ice to liquid.

I thought of it more in terms that the total heat had to be heat required to melt ice + q (ice) + q (water), then I plugged in and solved the equation.
by Charlotte Adams 1A
Fri Feb 05, 2021 9:04 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Sapling Weeks 3 and 4 Number 20
Replies: 5
Views: 28

Re: Sapling Weeks 3 and 4 Number 20

If you drew the lewis dot structure for N2 or if you remember VSEPR you wold be able to find the shape.
by Charlotte Adams 1A
Sat Jan 30, 2021 2:16 pm
Forum: Administrative Questions and Class Announcements
Topic: 14BL and CL
Replies: 13
Views: 167

Re: 14BL and CL

I'm currently taking 14BL virtually with Dr. Casey, and while I do regret missing out on the experience of an in-person lab, I would say that the class itself has been enjoyable. I learn best in a hands-on environment, so my lab skills will likely be shaky after only learning through videos and sim...
by Charlotte Adams 1A
Sat Jan 30, 2021 2:14 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding a gas
Replies: 25
Views: 112

Re: Adding a gas

Inert gases have no effect on pressure, compressing the system changes the pressure and thus K.
by Charlotte Adams 1A
Sat Jan 30, 2021 2:11 pm
Forum: Student Social/Study Group
Topic: Worried About MT 1 Grades
Replies: 39
Views: 293

Re: Worried About MT 1 Grades

I understand how you feel and it is not a good feeling. Luckily, we have another midterm and a final so we have the ability to raise our grades. Also, chem community and hw are really easy points that add up which helps.
by Charlotte Adams 1A
Sat Jan 30, 2021 2:06 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: How Does Temperature Affect the Equilibrium Constant?
Replies: 25
Views: 139

Re: How Does Temperature Affect the Equilibrium Constant?

If the reaction is endothermic, increasing temp will increase K because more products have formed
If the reaction is exothermic, increasing the temp will decrease K because more reactants are formed.
by Charlotte Adams 1A
Sat Jan 30, 2021 2:05 pm
Forum: Student Social/Study Group
Topic: Midterm Scores
Replies: 25
Views: 148

Re: Midterm Scores

My guess would be at least a week to two weeks.
by Charlotte Adams 1A
Sat Jan 30, 2021 2:03 pm
Forum: Phase Changes & Related Calculations
Topic: when to assume x is insignificant
Replies: 83
Views: 260

Re: when to assume x is insignificant

Also, I believe for weak acids/bases x is insignificant because you know that because they are weak, they will have a K value that is considered small.
by Charlotte Adams 1A
Sat Jan 30, 2021 2:01 pm
Forum: Administrative Questions and Class Announcements
Topic: 14BL and CL
Replies: 13
Views: 167

Re: 14BL and CL

I'm currently taking 14BL virtually with Dr. Casey, and while I do regret missing out on the experience of an in-person lab, I would say that the class itself has been enjoyable. I learn best in a hands-on environment, so my lab skills will likely be shaky after only learning through videos and sim...
by Charlotte Adams 1A
Thu Jan 28, 2021 5:52 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4.13
Replies: 3
Views: 32

Re: 4.13

The C and H2 were omitted because they are already in their standard state. Also I am pretty sure we will be given standard enthalpies of formation of each reactant and product on midterm.
by Charlotte Adams 1A
Thu Jan 28, 2021 5:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Would an aq agent be included in K?
Replies: 27
Views: 135

Re: Would an aq agent be included in K?

Yes, it is included in the equation unless it is unless it is a pure solid or liquid.
by Charlotte Adams 1A
Sun Jan 24, 2021 6:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Factors that affect the Equilibrium Constant
Replies: 8
Views: 49

Re: Factors that affect the Equilibrium Constant

I believe that you are correct that the equilibrium concentration of the reactants would be larger to maintain the equilibrium constant.
by Charlotte Adams 1A
Sun Jan 24, 2021 6:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 45
Views: 183

Re: Temperature

We might get the delta H and be asked what would be favored if there was a temperature increase/decrease.
by Charlotte Adams 1A
Sat Jan 23, 2021 1:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: D.19
Replies: 3
Views: 34

Re: D.19

Are you sure that the initial concentration is what causing you to get this problem wrong? What did you do to get your answer?
by Charlotte Adams 1A
Sat Jan 23, 2021 1:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 2 Hw 5
Replies: 6
Views: 83

Re: Sapling Week 2 Hw 5

I think the rule of the percentage being over 5% applies to percent ionization and percent protonation.
by Charlotte Adams 1A
Fri Jan 22, 2021 5:19 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bromine standard state
Replies: 4
Views: 22

Re: Bromine standard state

I think, like the others said, that he was referring to iodine as i2.
by Charlotte Adams 1A
Fri Jan 22, 2021 5:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 18
Views: 182

Re: Midterm

Is the exam proctored by our TA?
by Charlotte Adams 1A
Fri Jan 22, 2021 5:13 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka correlation to strength of an acid
Replies: 30
Views: 119

Re: Ka correlation to strength of an acid

Stronger acid= higher Ka, lower pKa
weaker acid=lower Ka, higher pKa
by Charlotte Adams 1A
Fri Jan 22, 2021 5:08 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard State of Elements
Replies: 4
Views: 37

Re: Standard State of Elements

I assume we will only be given problems with elements that we know the standard state for. So like diatomic molecules and carbon.
by Charlotte Adams 1A
Fri Jan 22, 2021 5:06 pm
Forum: Phase Changes & Related Calculations
Topic: bonds and energy
Replies: 13
Views: 113

Re: bonds and energy

Im not exactly sure but I know that breaking the bonds of a liquid to get a vapor requires energy so for the opposite to occur energy is released.
by Charlotte Adams 1A
Sun Jan 17, 2021 3:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Acids, Bases, and Autoprotrolysis
Replies: 7
Views: 59

Re: Acids, Bases, and Autoprotrolysis

I believe that is correct because I know that for an acid/bas reaction Ka*Kb=Kw which is the constant for the autoprotrolysis of water
by Charlotte Adams 1A
Sun Jan 17, 2021 3:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #5
Replies: 6
Views: 52

Re: Sapling Week 1 #5

It also helps to eliminate the equations you know that you are not gonna use. For example the one equation had Cl but that was not in our final equation so we know that we don't need that equation.
by Charlotte Adams 1A
Sun Jan 17, 2021 3:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Chart with Gas Pressures
Replies: 8
Views: 67

Re: ICE Chart with Gas Pressures

Yes, you do the same ICE table and procedure as you would if given concentration and I remember Dr. lavelle saying 1 bar= 1atm
by Charlotte Adams 1A
Sun Jan 17, 2021 3:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterms
Replies: 24
Views: 108

Re: Midterms

I thought it would be during discussion like last quarter, but people in my discussion said that it was during class on January 29th.
by Charlotte Adams 1A
Sun Jan 17, 2021 1:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: quadratic equations to solve for X
Replies: 7
Views: 67

Re: quadratic equations to solve for X

Does someone mind explaining what to do witht he reverse of that question ^? Like when you end up with two negative answers. Or is that typically a red flag and the work should be checked? I think you want to check that because usually X is the concentration of some reactant or product and a concen...
by Charlotte Adams 1A
Sun Jan 17, 2021 1:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice Box Method
Replies: 14
Views: 106

Re: Ice Box Method

if the rxn shifts to right, the reactants decrease and the products increase. If the reaction shifts to left, the reactants increase and the products decrease.
by Charlotte Adams 1A
Wed Jan 13, 2021 11:13 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pressure's effect on concentration
Replies: 4
Views: 39

Re: Pressure's effect on concentration

The pressure increase we are referencing is the pressure increase that occurs when the volume is decreased. This causes the reaction to shift because my changing the volume, we are changing the concentration of the reactants and products and this causes the reaction to no longer be in equilibrium.
by Charlotte Adams 1A
Wed Jan 13, 2021 11:10 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 45
Views: 183

Re: Temperature

We would need to be given if the reaction is endothermic or exothermic. I assume we will either by told or given delta h.
by Charlotte Adams 1A
Wed Jan 13, 2021 11:09 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient
Replies: 10
Views: 497

Re: Reaction Quotient

the reaction quotient expression has the same form as expression K, but it refers to any stage of the reaction
by Charlotte Adams 1A
Wed Jan 13, 2021 11:06 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in volume
Replies: 4
Views: 35

Re: Change in volume

When volume decreases and the pressure increases, the reaction will shift in the direction that reduces the number of molecules
by Charlotte Adams 1A
Wed Jan 13, 2021 11:02 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change in K (P&T)
Replies: 9
Views: 62

Re: Change in K (P&T)

The only thing that will change the equilibrium constant, k, is temperature. However when you increase the pressure by decreasing the volume, the concentration increases and the reaction will thus proceed to the left or right in order to return to equilibrium.
by Charlotte Adams 1A
Wed Jan 13, 2021 10:58 am
Forum: Student Social/Study Group
Topic: Comfort Movies
Replies: 130
Views: 595

Re: Comfort Movies

Harry potter!!
by Charlotte Adams 1A
Sun Jan 10, 2021 11:51 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Q5
Replies: 2
Views: 40

Re: Sapling Q5

For problems like these, you first have to look at all of the molecules that make up the products and reactants, in this case that is NH3, 3I2, N2, and 6HI. Then, you can look at the one step equations given and make note of the ones that contain the molecules you got from step one. Then, from the ...
by Charlotte Adams 1A
Sun Jan 10, 2021 11:49 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle (Lecture Example)
Replies: 4
Views: 24

Re: Le Chatelier's Principle (Lecture Example)

You can also think of it in terms of Q, if you remove product then Q will be less than K and we know when that happens that the system will proceed to the right/make more product.
by Charlotte Adams 1A
Sat Jan 09, 2021 12:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #10
Replies: 7
Views: 74

Re: Sapling Week 1 #10

Im not positive but I think that because reaction is going in opposite direction, you have to set it equal to 1/K
by Charlotte Adams 1A
Tue Jan 05, 2021 1:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant in terms of stability
Replies: 4
Views: 63

Re: Equilibrium Constant in terms of stability

I think if K is greater than 1 that means the product is more stable than the reactant because there is a higher concentration of product than reactant. Same for if the reactant is higher than the product.
by Charlotte Adams 1A
Tue Jan 05, 2021 1:55 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Reactant in Excess
Replies: 9
Views: 94

Re: Reactant in Excess

The reaction will proceed to the right and the excess reactant is turned to product.
by Charlotte Adams 1A
Tue Jan 05, 2021 1:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q vs K
Replies: 12
Views: 106

Re: Q vs K

Just to add to what everyone else has said, Q=K when the reaction is at equilibrium.
by Charlotte Adams 1A
Tue Jan 05, 2021 1:52 pm
Forum: Ideal Gases
Topic: Sapling Homework
Replies: 22
Views: 228

Re: Sapling Homework

I had the same problem and it wouldn't let me use my credit so I logged out and logged back in then it worked. Also I had a sapling problem last quarter and had to call them, the IT people at sapling are pretty helpful.
by Charlotte Adams 1A
Tue Jan 05, 2021 1:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs Kp
Replies: 14
Views: 128

Re: Kc vs Kp

I believe the values will be different but if you need to convert one to the other you can use the equation PV=nRT.
by Charlotte Adams 1A
Tue Jan 05, 2021 1:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Boxes
Replies: 13
Views: 136

Re: ICE Boxes

Products will be plus X because as they reaction takes places products are formed. Reactants are minus X because as the reaction occurs the reactants are being used to form the products
by Charlotte Adams 1A
Tue Jan 05, 2021 1:47 pm
Forum: Student Social/Study Group
Topic: Advice for someone who didn't take 14A with professor Lavelle
Replies: 61
Views: 392

Re: Advice for someone who didn't take 14A with professor Lavelle

I would read the textbook lessons he assigns and make sure to both the sapling questions and DO THE TEXTBOOK questions even though it is not mandatory. They often show up on the exams. Also make sure you understand the concepts behind the math and not just how to plug the numbers into the equation.
by Charlotte Adams 1A
Sat Dec 12, 2020 8:40 am
Forum: Naming
Topic: en, dien, edta, etc.
Replies: 2
Views: 35

Re: en, dien, edta, etc.

Some of the problems we have done included them, but my guess is if they are part of the problem that the question will say what each represents.
by Charlotte Adams 1A
Sat Dec 12, 2020 8:39 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: shape
Replies: 6
Views: 69

Re: shape

I believe we do not know and I don't think we would be asked to identify. I think we should just know that if a coordination compound has a coordination number of 6 it is an octahedron and if it is four it can be tetrahedral or square planar.
by Charlotte Adams 1A
Sat Dec 12, 2020 8:38 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Different equations
Replies: 2
Views: 62

Re: Different equations

I believe that equation is only used in a one electron atom and it would be used if we wanted to find the energy absorbed or released.
by Charlotte Adams 1A
Sat Dec 12, 2020 8:33 am
Forum: Conjugate Acids & Bases
Topic: Oxyacids
Replies: 8
Views: 73

Re: Oxyacids

I believe an oxyacid is just an acid that contains oxygen, like HNO3 or H2SO4
by Charlotte Adams 1A
Sat Dec 12, 2020 8:31 am
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acids and Bases
Replies: 2
Views: 55

Re: Polyprotic Acids and Bases

I think just know that they can donate more than 1 hydrogen proton and they include H2S04, H2CO3, and H3PO4
by Charlotte Adams 1A
Sun Dec 06, 2020 1:31 pm
Forum: Naming
Topic: Order of Ligands/naming
Replies: 28
Views: 186

Re: Order of Ligands/naming

LeanneBagood_2E wrote:What about when you're presented with the names+prefixes already and you have to find the opposite?
Like, does the order you write the ligands/formulas in the square brackets matter?

My TA said that it doesn't but I think you would just do it alphabetically.
by Charlotte Adams 1A
Sun Dec 06, 2020 1:27 pm
Forum: Naming
Topic: Sapling Week 9 #5
Replies: 3
Views: 56

Re: Sapling Week 9 #5

if you know what (en) stands for you will be able to tell if it is a polydentate ligand by the name of the compound.
by Charlotte Adams 1A
Sun Dec 06, 2020 8:39 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sapling #3 pt. 2
Replies: 5
Views: 49

Re: Sapling #3 pt. 2

If a complex has a coordination number of four, a seesaw shape would not be the most stable structure because the atoms are not as far from each other as possible, like in a tetrahedral or square planar shape.
by Charlotte Adams 1A
Tue Dec 01, 2020 2:00 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Focus Exercise 2.27
Replies: 4
Views: 47

Re: Focus Exercise 2.27

I believe diamagnetic just means that there are no unpaired electrons
by Charlotte Adams 1A
Tue Dec 01, 2020 1:57 pm
Forum: Sigma & Pi Bonds
Topic: Rotation
Replies: 13
Views: 156

Re: Rotation

If a a pi bond is present that means that a sigma bond is also present.
by Charlotte Adams 1A
Tue Dec 01, 2020 1:56 pm
Forum: Ionic & Covalent Bonds
Topic: Polar and Nonpolar
Replies: 28
Views: 229

Re: Polar and Nonpolar

Drawing the shape of the molecule and the dipole moments will help because it will show if the dipole vectors cancel out.
by Charlotte Adams 1A
Tue Dec 01, 2020 1:51 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 4
Views: 51

Re: Naming Coordination Compounds

I think as long as we can name the ligands we used in class examples, in the sapling hw, and in the textbook problems, we will be fine.
by Charlotte Adams 1A
Tue Dec 01, 2020 1:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 9
Views: 108

Re: Ligands

Ligands attach to a transition metal in a coordinate covalent bond. If there are 6 ligands connected to the transition metal it is an octahedral Copley and if there are 4 ligands attached it is either tetrahedral or square planar complex.
by Charlotte Adams 1A
Tue Dec 01, 2020 1:47 pm
Forum: Resonance Structures
Topic: Valence Electrons [ENDORSED]
Replies: 43
Views: 439

Re: Valence Electrons [ENDORSED]

You can use the group number to determine the number of valence electrons or you can figure out the electron configuration but that takes a while.
by Charlotte Adams 1A
Mon Nov 30, 2020 10:39 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 5
Views: 89

Re: Bond angles

Can someone explain why the bond angles about the carbon atoms for the molecule (CH3)2Be are 109.5 degrees. Shouldn't it be less than 109.5 because Be pushes the H atoms further away from it than a H atom would?
by Charlotte Adams 1A
Mon Nov 30, 2020 10:32 am
Forum: Electronegativity
Topic: Be vs Cl
Replies: 13
Views: 158

Re: Be vs Cl

The elements closest to Fluorine have a higher electronegativity.
by Charlotte Adams 1A
Fri Nov 27, 2020 9:55 am
Forum: Sigma & Pi Bonds
Topic: Perpendicular Pi Bonds
Replies: 2
Views: 23

Re: Perpendicular Pi Bonds

I was also confused and still am, but the solution says molecules of this type can be explained by the formula H2CC(x)CH2 and if X is an odd number the H atoms at end of molecule will lie on perpendicular planes.
by Charlotte Adams 1A
Thu Nov 26, 2020 9:58 am
Forum: Hybridization
Topic: Sapling Week 7 & 8 HW Question 11
Replies: 14
Views: 145

Re: Sapling Week 7 & 8 HW Question 11

I just know that the hybridization numbers have to add up to the atomic orbitals and that s can only go to 1, p to 3, and d to 5. So if there are 5 atomic orbitals I know it is sp3d, because 1+3+1=5.

Sorry if this is confusing.

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