Search found 130 matches

by Jessica Esparza 2H
Sat Mar 14, 2020 8:38 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Objective
Replies: 2
Views: 54

Objective

Explain how the collision model and activated complex model account for the temperature dependence of reactions.

Can anyone expand on this please?
by Jessica Esparza 2H
Thu Mar 12, 2020 7:27 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7D1
Replies: 4
Views: 66

Re: 7D1

What equation are they using in this problem? Honestly I thought that the solution guide answer was confusing. To solve, use the equation ln(kr2/kr1) = Ea/R(1/T1 - 1/T2), found on page 623 of the textbook. You use .87 for kr2, .76 for kr1, 8.31•10^-3 for R, 1000 for T1, and 1030 for T2, and solve f...
by Jessica Esparza 2H
Tue Mar 10, 2020 11:45 pm
Forum: Administrative Questions and Class Announcements
Topic: What is the plan for the final?
Replies: 16
Views: 229

Re: What is the plan for the final?

He just sent out an email!
by Jessica Esparza 2H
Tue Mar 10, 2020 3:08 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts and Rate Law
Replies: 4
Views: 37

Catalysts and Rate Law

I know intermediates can't be in our rate law but can catalysts be included?
by Jessica Esparza 2H
Tue Mar 10, 2020 10:37 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 1
Views: 24

Catalysts

Do catalysts have to be added to the slow step in order to change the rate? Will they not affect the rate if they are added to the fast step?
by Jessica Esparza 2H
Mon Mar 09, 2020 10:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: In lecture example
Replies: 1
Views: 20

In lecture example

Could someone please explain the example of a solid catalyst Dr.Lavelle gave in class today please. What was he referring to when talking about adsorption?
by Jessica Esparza 2H
Mon Mar 09, 2020 8:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7E7
Replies: 1
Views: 16

7E7

" A catalyst is not consumed in the course of a reaction"
Why is this true? I thought it was consumed but then is produced again?
by Jessica Esparza 2H
Sat Mar 07, 2020 11:47 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7D1
Replies: 4
Views: 66

7D1

Could anyone please explain the steps taken in this problem? For example, why did they multiply the temperatures? Did they use the original equation but then canceled out ln[A]?
by Jessica Esparza 2H
Sat Mar 07, 2020 11:40 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Homework 15. 63
Replies: 2
Views: 571

Re: Homework 15. 63

This was an awesome response! I was very confused and this post really broke down the steps.
by Jessica Esparza 2H
Tue Mar 03, 2020 3:36 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.7
Replies: 5
Views: 86

Re: 6M.7

I just used the ones that all use the same amount of electrons and it seemed to work out.
by Jessica Esparza 2H
Tue Mar 03, 2020 3:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Hw problem 6M.7
Replies: 1
Views: 15

Re: Hw problem 6M.7

Yes, there is a table in the appendix. You just look at the values and order them by they're E values.
by Jessica Esparza 2H
Tue Mar 03, 2020 3:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.5 part A
Replies: 1
Views: 31

Re: 6M.5 part A

Because Mg is a metal, it's just currently in liquid form at 25C.
by Jessica Esparza 2H
Tue Mar 03, 2020 3:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Oxidizing Power
Replies: 3
Views: 35

Oxidizing Power

If something has high oxidizing power, does that mean their standard reduction potential is high?
by Jessica Esparza 2H
Tue Feb 25, 2020 12:26 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Lecture notes
Replies: 4
Views: 47

Lecture notes

I think I might've written something down wrong during lecture. Can anyone explain how concentration affects cell potential?
by Jessica Esparza 2H
Tue Feb 25, 2020 10:59 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2
Replies: 6
Views: 65

Re: Test 2

It was until the lecture from yesterday. And will include the lecture from the Friday after the midterm.
by Jessica Esparza 2H
Tue Feb 25, 2020 10:57 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.1
Replies: 4
Views: 83

Re: 6M.1

Has anyone confirmed if this is a typo? I was confused when looking at the answer key.
by Jessica Esparza 2H
Tue Feb 25, 2020 10:56 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 7
Views: 77

Re: Cell Diagrams

I'm also confused on why the cell diagram was written this way!
by Jessica Esparza 2H
Tue Feb 25, 2020 10:53 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6N.9
Replies: 2
Views: 21

6N.9

How are you supposed to know that tin is the anode? I attached the question below for reference.
by Jessica Esparza 2H
Tue Feb 25, 2020 10:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6N.1
Replies: 1
Views: 28

6N.1

Does anyone know if this is just a typo and the work done here is wrong since they used 2 instead of 1?
by Jessica Esparza 2H
Sun Feb 23, 2020 8:34 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Questions 6O.1 &6).3
Replies: 1
Views: 34

Questions 6O.1 &6).3

Hey everyone!! I don't have my book with me and was wondering if anyone could post the questions to 6O.1 and 6O.3, please!
by Jessica Esparza 2H
Sat Feb 22, 2020 12:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagrams
Replies: 2
Views: 45

Cell diagrams

Could anyone help me with D? I have no idea of the thought process on how to do it.
by Jessica Esparza 2H
Fri Feb 21, 2020 3:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: galvanic cell
Replies: 2
Views: 11

Re: galvanic cell

I think that's when it's considered to be dead.
by Jessica Esparza 2H
Fri Feb 21, 2020 3:52 pm
Forum: Balancing Redox Reactions
Topic: balancing half reactions in a basic solution
Replies: 7
Views: 65

Re: balancing half reactions in a basic solution

Do you add the same amount of OH-?
by Jessica Esparza 2H
Fri Feb 21, 2020 3:50 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 9
Views: 80

Oxidation Numbers

Does anyone have any tips for finding oxidation numbers?
by Jessica Esparza 2H
Fri Feb 21, 2020 3:50 pm
Forum: Balancing Redox Reactions
Topic: combining redox reactions
Replies: 2
Views: 18

Re: combining redox reactions

Your electrons should cancel out. Nothing else has to cancel but it can occur.
by Jessica Esparza 2H
Fri Feb 21, 2020 3:49 pm
Forum: Balancing Redox Reactions
Topic: Adding Water in Redox Reactions
Replies: 3
Views: 30

Re: Adding Water in Redox Reactions

You add water in both acidic and basic solutions to balance oxygen.
by Jessica Esparza 2H
Fri Feb 21, 2020 3:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 3
Views: 17

Salt Bridge

Could anyone please explain what a salt bridge does?
by Jessica Esparza 2H
Thu Feb 13, 2020 7:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Review session powerpoints
Replies: 4
Views: 66

Re: Review session powerpoints

I know one of them was posted under this section.
by Jessica Esparza 2H
Thu Feb 13, 2020 7:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Thermodynamic midterm review ppt 2/5 Chenxiang Wang
Replies: 4
Views: 186

Re: Thermodynamic midterm review ppt 2/5 Chenxiang Wang

I'm not seeing this until now but it will be very helpful for the final!
by Jessica Esparza 2H
Thu Feb 13, 2020 7:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm grading
Replies: 8
Views: 119

Re: Midterm grading

It is uniform graders. Does anyone know if it'll take about a week like last time?
by Jessica Esparza 2H
Thu Feb 13, 2020 7:28 pm
Forum: Administrative Questions and Class Announcements
Topic: grading curve
Replies: 10
Views: 107

Re: grading curve

I think if he does it'll only be a few points.
by Jessica Esparza 2H
Thu Feb 13, 2020 7:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 1
Views: 33

Test 2

I know its early, but does anyone know what the second test will be on?
by Jessica Esparza 2H
Sat Feb 08, 2020 2:11 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Molar Entropy
Replies: 3
Views: 38

Molar Entropy

What takes precedence when comparing entropies between gases, the degeneracy or molecular weight?
by Jessica Esparza 2H
Thu Feb 06, 2020 9:21 pm
Forum: Phase Changes & Related Calculations
Topic: Thermochemistry outline
Replies: 1
Views: 26

Thermochemistry outline

Understand the environmental impact of burning fossil fuels, and the use of alternative
fuels as energy sources.

Does this relate to how fossil fuels release a lot of heat into the atmosphere?
by Jessica Esparza 2H
Thu Feb 06, 2020 9:43 am
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: HW Question 4H.9
Replies: 1
Views: 22

HW Question 4H.9

For HW 9.35, it says that Container A is filled with 1.0 mol of the atoms of an ideal monatomic gas. Container B has 1.0 mol of atoms bound together as diatomic molecules that are not vibrationally active. Container C has 1.0 mol of atoms bound together as diatomic molecules that are vibrationally a...
by Jessica Esparza 2H
Tue Feb 04, 2020 11:20 am
Forum: Calculating Work of Expansion
Topic: Irreversible vs Reversible
Replies: 1
Views: 32

Irreversible vs Reversible

With respect to external pressure, can anyone explain the difference between an irreversible and reversible expansion?
by Jessica Esparza 2H
Tue Feb 04, 2020 10:37 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 4F.11
Replies: 1
Views: 52

4F.11

" During the test of an internal combustion engine, 3.00L of nitrogen gas at 18.5 degrees C was compressed suddenly (and irreversibly) to .500L by driving in a piston. In the process the temperature of the gas increased to 28.1 degrees C. Assume ideal behavior and 1.00 mole of nitrogen gas. Wha...
by Jessica Esparza 2H
Sun Feb 02, 2020 2:31 pm
Forum: Calculating Work of Expansion
Topic: Homework Textbook
Replies: 1
Views: 18

Homework Textbook

Hey, everyone! I don't have my textbook with me but wanted to do some homework, could anyone upload section 4F and 4 G homework sections, please!
by Jessica Esparza 2H
Thu Jan 30, 2020 9:49 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Mondays Lecture Question
Replies: 3
Views: 34

Re: Mondays Lecture Question

LNgo 1G wrote:Because the reaction in that example is between a string acid and a strong base, it is a neutralization acid and forms water. The density of pure water is about 1.0 g/mL.

Why are we using density?
by Jessica Esparza 2H
Thu Jan 30, 2020 9:23 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Mondays Lecture Question
Replies: 3
Views: 34

Mondays Lecture Question

On Monday, "in a constant P calorimeter at 25c. Mix 50.0ml each of 1.0M HCL and 1.0 M NaOH after mixing, T=31.9C. In his answer he assumed density of solution to be 1.0g/ml, why did he do this? Why didn't we just use how many moles we had for our equation? Also why did he multiply this number t...
by Jessica Esparza 2H
Thu Jan 30, 2020 9:20 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Constant Pressure
Replies: 7
Views: 64

Constant Pressure

Can anyone please explain what it means to have constant pressure or constant volume?
by Jessica Esparza 2H
Tue Jan 28, 2020 11:20 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Textbook Section
Replies: 2
Views: 36

Re: Textbook Section

This is what I'm trying to figure out too. It seems we've covered 4E and parts of 4D and 4C but not 4A or 4B.
by Jessica Esparza 2H
Tue Jan 28, 2020 11:18 am
Forum: Phase Changes & Related Calculations
Topic: Change in Temperature
Replies: 10
Views: 49

Re: Change in Temperature

The equilibrium constant will only rise if your reaction is endothermic and you add heat. If you add heat and it's exothermic the equilibrium constant will decrease (this is because your reverse reaction is endothermic and so adding heat will cause a reaction to proceed in reverse direction.
by Jessica Esparza 2H
Tue Jan 28, 2020 11:16 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4E.5
Replies: 2
Views: 32

4E.5

C for 4E.5 stated that there enthalpy is zero, but I dont understand how if new bonds are forming?
by Jessica Esparza 2H
Tue Jan 28, 2020 10:11 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4A and B
Replies: 2
Views: 32

Re: 4A and B

I would maybe wait till he covers it. I also noticed 4A and 4B had a lot of terms we havent covered.
by Jessica Esparza 2H
Tue Jan 28, 2020 9:59 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4C.3
Replies: 3
Views: 74

4C.3

I am working on problem 4C.3, which asks to calculate the final temperature and the change in enthalpy when 765 J of energy is transferred as heat to 0.820 mol Kr (g) at 298 L and 1.00 atm. (at constant pressure and constant volume) When solving, they used 5/2 R to get the heat capacity, I'm wonderi...
by Jessica Esparza 2H
Mon Jan 27, 2020 12:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Fridays Lecture (week 3)
Replies: 1
Views: 81

Fridays Lecture (week 3)

Hello everyone! I wasnt able to make it to Fridays lecture and was hoping someone could please share their notes. Thank you!!
by Jessica Esparza 2H
Thu Jan 23, 2020 4:05 pm
Forum: Phase Changes & Related Calculations
Topic: Order to Read Book
Replies: 3
Views: 29

Order to Read Book

Dr. Lavelle said something about not going in the exact order of the book. Which sections of Focus 4 should we be reading first/doing the homework?
by Jessica Esparza 2H
Thu Jan 23, 2020 4:01 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs liquid
Replies: 7
Views: 73

Steam vs liquid

I got a little confused on Professors explanation of why steam causes a worse burn than boiling water, can anyone explain?
by Jessica Esparza 2H
Mon Jan 20, 2020 7:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Module
Replies: 4
Views: 49

Re: Module

okay! thanks i think i fixed it, can anyone confirm the answer is 2.10x10^-3
by Jessica Esparza 2H
Mon Jan 20, 2020 6:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Module
Replies: 4
Views: 49

Module

19. Calculate the reaction quotient, QC, from the following equilibrium data collected in a 3.00 L sealed reaction vessel for the reaction: AsH3 (g) ⇌ As (s) + H2 (g) AsH3 = 5.55 x 10-4 mol, As = 3.31 x 10-3 mol, H2 = 1.23 x 10-3 mol. I keep on getting 2.2 , can anyone tell me what I am doing wrong?...
by Jessica Esparza 2H
Mon Jan 20, 2020 2:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw temperature
Replies: 8
Views: 51

Re: Kw temperature

Does anyone know how this number would change in response to temperature?
by Jessica Esparza 2H
Mon Jan 20, 2020 2:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percent ionization
Replies: 2
Views: 20

Percent ionization

When we get a percentage of ionization, does that number represent how much we have left?
by Jessica Esparza 2H
Mon Jan 20, 2020 1:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5 percent rule
Replies: 2
Views: 18

5 percent rule

Could anyone explain what the five percent rule is, please? Are you looking at x or your ionization percentage?
by Jessica Esparza 2H
Mon Jan 20, 2020 1:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Workshop Monday
Replies: 2
Views: 72

Workshop Monday

Hello everyone! Professor said that there would be a session today in covel, does anyone know if it will be Lyndon holding his regular session? I believe he said last week he wasn't holding it today so I was wondering if anyone knew.
by Jessica Esparza 2H
Mon Jan 20, 2020 1:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Salt solutions
Replies: 1
Views: 33

Salt solutions

Professor mentioned something about certain elements that don't affect ph and I was wondering if anyone could tell me what it was? I wasn't able to write it down.
by Jessica Esparza 2H
Sun Jan 19, 2020 6:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Titration
Replies: 3
Views: 30

Titration

Professor mentioned something about titration but that isn't on this test correct?
by Jessica Esparza 2H
Sun Jan 19, 2020 6:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Buffer
Replies: 6
Views: 44

Buffer

Can anyone explain what a buffer is please?
by Jessica Esparza 2H
Thu Jan 16, 2020 10:36 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Questions 6C5,6c9
Replies: 1
Views: 30

Questions 6C5,6c9

Could anyone post the table 6C.1 and 6C.2, I don't have my book with me but wanted to get some problems done. Thank you!
by Jessica Esparza 2H
Tue Jan 14, 2020 10:08 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A.19
Replies: 6
Views: 73

Re: 6A.19

I was looking at this too! Either they forgot to add mM to the problem or it is an error in the solutions manual. I got the answer to the ^-15.
by Jessica Esparza 2H
Tue Jan 14, 2020 9:57 am
Forum: Resonance Structures
Topic: Resonance
Replies: 1
Views: 165

Resonance

Hello, I was wondering why the N2H2 structure did not have resonance but the others did. Is there any rule for when something has resonance? Thank you.
by Jessica Esparza 2H
Fri Jan 10, 2020 2:25 pm
Forum: Ideal Gases
Topic: ICE table
Replies: 7
Views: 393

Re: ICE table

You set up your ice table to then be able to get your equilibrium constants. After that, you use the equation we have learned which is reactants/products.
by Jessica Esparza 2H
Fri Jan 10, 2020 2:17 pm
Forum: Ideal Gases
Topic: Chatelier’s Principle
Replies: 8
Views: 71

Re: Chatelier’s Principle

Do you happen to know on which page this falls on in the ideal gases section?
by Jessica Esparza 2H
Fri Jan 10, 2020 2:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Graphing K and Q Values
Replies: 4
Views: 44

Re: Graphing K and Q Values

I don't believe so, he has never mentioned this and I don't believe it's on the learning objectives on outline1.
by Jessica Esparza 2H
Fri Jan 10, 2020 2:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp vs Kc
Replies: 6
Views: 35

Re: Kp vs Kc

It becomes simpler when you see the phases that your reaction is in, which is usually given to you. For example, if it's in the gas phase you'd use partial pressures. Also if they are giving you units that relate to partial pressure then you'd use Kp.
by Jessica Esparza 2H
Fri Jan 10, 2020 2:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pressure and Volume
Replies: 8
Views: 49

Re: Pressure and Volume

It does not affect K. I believe it can affect the concentration of products and reactants but not the ratio between them.
by Jessica Esparza 2H
Thu Jan 09, 2020 4:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework Question 5H.1
Replies: 2
Views: 29

Homework Question 5H.1

I have attached the question below and the answer. However I was wondering if someone could go through how they came to find b and c. Why did they square root for b?
by Jessica Esparza 2H
Thu Dec 05, 2019 7:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sulfato
Replies: 1
Views: 34

Sulfato

Is sulfato a chelating ligand? or is it monodentate?
by Jessica Esparza 2H
Tue Dec 03, 2019 9:24 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Textbook question 6B.9
Replies: 2
Views: 66

Re: Textbook question 6B.9

I saw this too, is there somewhere we can double check for the answers? Also, [OH]x[pOH]=10^-14. If you use the numbers in the answer key it doesnt work, but if you use the numbers we got, it does? So I'm thinking it probably was an error.
by Jessica Esparza 2H
Tue Dec 03, 2019 6:38 pm
Forum: Calculating the pH of Salt Solutions
Topic: 6D.11 [ENDORSED]
Replies: 2
Views: 174

6D.11 [ENDORSED]

The question states, Decide whether an aqueous solution of each of the following salts has a pH equal to or greater than, or less than 7. I was a little confused on how they got the reactions for AlCl3 and Cu(NO3)2.
I put the answer down below if that helps when trying to explain, thank you :)
by Jessica Esparza 2H
Tue Dec 03, 2019 6:07 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.9
Replies: 5
Views: 53

Re: 6B.9

Ryan Chang 3A wrote:You are using the correct formula to find the concentration of OH, which is [M]=10^-POH. Plugging in the numbers you get: 10^-14.176 = 6.668 x 10^-15 M, which is the correct answer.
The textbook says it would be 1.5x10^-14
by Jessica Esparza 2H
Tue Dec 03, 2019 4:13 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.9 Row 2&1
Replies: 2
Views: 34

Re: 6B.9 Row 2&1

Ah I see that makes sense!
by Jessica Esparza 2H
Tue Dec 03, 2019 10:52 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.9 Row 2&1
Replies: 2
Views: 34

6B.9 Row 2&1

6B.9 asks you to find the missing values given only certain ones. On row 1 they give you a H30+ concentration of 1.5, you can find the ph to be .176. However, when I would try to get the [H30+] concentration through the pH to double check my answers I would not get 1.5 through the equation we're sup...
by Jessica Esparza 2H
Tue Dec 03, 2019 10:34 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.9
Replies: 5
Views: 53

6B.9

The question asks to find the [OH], [Ph], and [OH] concentration with the given information that is 1.50M of [H30+]. You can get ph 0.176 and OH from that as 14.17. However, how would you get the OH concentration? I thought you would use the equation that is [M]= 10^-pOH. However, you get an incorre...
by Jessica Esparza 2H
Mon Dec 02, 2019 8:52 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Finding concentration of H30+
Replies: 1
Views: 32

Finding concentration of H30+

On homework question 6A.23, it says to calculate the initial molarity of Ba(OH)2 and the molarities of Ba2+, OH-, and H3O+. You can find the first two, which I got 0.05M for OH-. However I don't understand how'd you find the H3O+ concentration. Is there a certain formula you always use? The solution...
by Jessica Esparza 2H
Tue Nov 26, 2019 9:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 1
Views: 45

Test 2

Does anyone know if test scores appear as 0/50 while grades are being inputted?
by Jessica Esparza 2H
Sun Nov 24, 2019 3:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Focus 9C.1 and 9C.2
Replies: 2
Views: 48

Focus 9C.1 and 9C.2

Could anyone tell me the name of these topics?/ What is the section heading for these focuses. Thank you so much! :)
by Jessica Esparza 2H
Wed Nov 20, 2019 1:40 pm
Forum: Lewis Structures
Topic: Strength of bonds
Replies: 3
Views: 158

Strength of bonds

Which pair of atoms are most tightly bound, HO- or HS-, can anyone help me figuring out the answer?
by Jessica Esparza 2H
Wed Nov 20, 2019 1:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 47

Re: Polarity

Thank you Brittany!
by Jessica Esparza 2H
Tue Nov 19, 2019 10:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 47

Re: Polarity

Yes, but would the overall molecule be polar?
by Jessica Esparza 2H
Tue Nov 19, 2019 10:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 47

Polarity

Do double bonds ever play a role in polarity? For example, in GaF3, there is a double bond on one of the fluorines. Would this molecule be considered polar or nonpolar?
by Jessica Esparza 2H
Tue Nov 19, 2019 9:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 3
Views: 43

Bond angles

I had a question regarding CH2CHCN, what would be their bond angles? 120 would be present, would 180 be present as well between C-C-N?
by Jessica Esparza 2H
Tue Nov 19, 2019 5:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma & Pi bonds
Replies: 5
Views: 57

Sigma & Pi bonds

Sigma bonds can rotate while Pi bonds cant. What gives each this characteristic?
by Jessica Esparza 2H
Tue Nov 19, 2019 3:16 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Types of forces
Replies: 4
Views: 46

Re: Types of forces

Therefore, unless it says there are ions or other different molecules, we don't include those?
by Jessica Esparza 2H
Tue Nov 19, 2019 1:02 pm
Forum: Lewis Structures
Topic: H2SeO4
Replies: 2
Views: 62

Re: H2SeO4

Oh, I see! Thank you!
by Jessica Esparza 2H
Tue Nov 19, 2019 12:56 pm
Forum: Lewis Structures
Topic: H2SeO4
Replies: 2
Views: 62

H2SeO4

For H2SeO4, how would you know that the oxygen is bonded to hydrogen? Why would the hydrogen's not be bonded to Se?
by Jessica Esparza 2H
Tue Nov 19, 2019 12:53 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Types of forces
Replies: 4
Views: 46

Types of forces

For homework question, 3F.1, it says to name the types of forces that can occur for certain molecules. In the answer key, SO2, only has dipole-dipole and London forces. Why is dipole-induced dipole and ion-dipole not included in the list?
by Jessica Esparza 2H
Tue Nov 19, 2019 9:48 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Square pyramidal
Replies: 3
Views: 39

Re: Square pyramidal

Thank you!! It looks really helpful.
by Jessica Esparza 2H
Mon Nov 18, 2019 8:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square pyramidal
Replies: 3
Views: 39

Square pyramidal

We never covered square pyramidal in lecture and I was wondering if anyone knew if we would be tested on this shape?
by Jessica Esparza 2H
Mon Nov 18, 2019 6:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 2
Views: 30

Bond angles

I was wondering what the bond angles would be for ICL2-, I know it's linear and would have a bond angle that's 180 but would there be any others? Thank you!
by Jessica Esparza 2H
Sat Nov 16, 2019 1:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Acids and Bases
Replies: 4
Views: 40

Re: Acids and Bases

I don't believe so, I believe acids and bases are covered in one of the last outlines of the quarter.
by Jessica Esparza 2H
Sat Nov 16, 2019 11:50 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Induced dipole-induced dipole force [ENDORSED]
Replies: 1
Views: 33

Re: Induced dipole-induced dipole force [ENDORSED]

An induced-dipole occurs when a dipole is created by the movement of electrons. As we know, electrons are always moving around. For a brief second, they'll be a partial negative/positive on an atom because of this random movement. This will occur in both molecules, leading to an attraction. It is ve...
by Jessica Esparza 2H
Sat Nov 16, 2019 11:47 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 3
Views: 32

Re: Lone pairs

Lone pairs occupy more space because lone pair can move more in a region than a bonding pair can. Electrons repel each other because of that negative-negative charge.
by Jessica Esparza 2H
Sat Nov 16, 2019 11:45 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Test 2
Replies: 5
Views: 46

Re: Test 2

Everything covered recently, and one slide from Monday's lecture. I believe it's going to be hybridization.
by Jessica Esparza 2H
Sun Nov 10, 2019 6:24 pm
Forum: Student Social/Study Group
Topic: midterm grades
Replies: 8
Views: 137

Re: midterm grades

It'll be after the lecture and not discussion. Most likely on Wednesday and TA's will be standing outside with the physical copies.
by Jessica Esparza 2H
Sun Nov 10, 2019 6:16 pm
Forum: Bond Lengths & Energies
Topic: test 2
Replies: 16
Views: 151

Re: test 2

Has he mentioned what parts of the outline it'll be?
by Jessica Esparza 2H
Sun Nov 10, 2019 5:20 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Hydrogen bonding
Replies: 7
Views: 37

Re: Hydrogen bonding

They are another form of bonding that isn't covalent or ionic. It deals with partial negatives and positives.
by Jessica Esparza 2H
Sun Nov 10, 2019 5:18 pm
Forum: Lewis Structures
Topic: Does the shape that I draw the Lewis structure matter?
Replies: 14
Views: 125

Re: Does the shape that I draw the Lewis structure matter?

The simplest answer would be yes it matters. We'll be learning more about the correct way to draw them in the lectures.

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