Search found 60 matches

by Nandhini_2K
Sat Mar 16, 2019 4:33 pm
Forum: General Rate Laws
Topic: H.W. Problem 15.17
Replies: 5
Views: 156

Re: H.W. Problem 15.17

Also why don't we calculate the order for reactant C?
by Nandhini_2K
Sat Mar 16, 2019 4:29 pm
Forum: General Rate Laws
Topic: H.W. Problem 15.17
Replies: 5
Views: 156

H.W. Problem 15.17

Part A asks to calculate the order for each reactant.

The solution Manuel uses experiment 2 and 3 to solve for the order with respect to B. Why can't we use experiment 1 and 2?
by Nandhini_2K
Sun Mar 10, 2019 6:25 am
Forum: Student Social/Study Group
Topic: Final
Replies: 24
Views: 586

Re: Final

Information regarding review sessions have been posted on the website now.
by Nandhini_2K
Fri Mar 08, 2019 8:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Review
Replies: 3
Views: 101

Re: Midterm Review

Yes, everything is posted on his website now.
by Nandhini_2K
Fri Mar 08, 2019 8:37 pm
Forum: Second Order Reactions
Topic: Final
Replies: 30
Views: 424

Re: Final

Did Dr.Lavelle mention how many questions the final might cover?
by Nandhini_2K
Sun Mar 03, 2019 5:49 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt(s)
Replies: 10
Views: 137

Re: Pt(s)

When there's no solid already in the rxn. Both the anode and cathode needs a solid.
by Nandhini_2K
Sat Mar 02, 2019 11:48 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test #2
Replies: 10
Views: 176

Re: Test #2

During your week 9 discussion
by Nandhini_2K
Thu Feb 28, 2019 3:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Organization of cell diagrams
Replies: 9
Views: 98

Re: Organization of cell diagrams

Yes you need add Pt(s) when there's no solid.
by Nandhini_2K
Sun Feb 24, 2019 3:23 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Concepts
Replies: 2
Views: 47

Re: Concepts

If delta G is negative: favors products and spontaneous in forward rxn.
If delta G is positive: favors reactants and non-spontaneous in forward rxn.
by Nandhini_2K
Sun Feb 24, 2019 3:16 am
Forum: Balancing Redox Reactions
Topic: Test 2 Material
Replies: 13
Views: 190

Re: Test 2 Material

Yes balancing redox reactions will be on it.
by Nandhini_2K
Sun Feb 24, 2019 3:15 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity
Replies: 6
Views: 118

Re: Spontaneity

When delta G is negative the product is favored and spontaneous in forward rxn. When delta G is positive reactants are favored and non spontaneous in forward rxn and spontaneous in reverse rxn.
by Nandhini_2K
Mon Feb 18, 2019 12:50 am
Forum: Student Social/Study Group
Topic: Midterms
Replies: 5
Views: 90

Re: Midterms

I believe so, but Dr. Lavelle will probably mention more details the day we get our midterms back.
by Nandhini_2K
Sun Feb 17, 2019 4:29 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Signs
Replies: 4
Views: 76

Re: Gibbs Free Energy Signs

Negative = Spontaneous
Positive = Non-Spontaneous
by Nandhini_2K
Sun Feb 17, 2019 4:27 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Midterm Grades
Replies: 35
Views: 572

Re: Midterm Grades

The TA's also have the answer key for the midterm questions if you want to take a look at it before you get your midterm back.
by Nandhini_2K
Mon Feb 11, 2019 1:55 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for enthalpy
Replies: 6
Views: 107

Re: Units for enthalpy

Either J or KJ. The final answer in J can be turned to KJ by simply dividing it by 1000.
by Nandhini_2K
Mon Feb 11, 2019 1:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 5
Views: 94

Re: Hess's Law

The test will provide the reaction similar to the homework problems.
by Nandhini_2K
Sat Feb 09, 2019 3:48 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Equations
Replies: 1
Views: 31

Re: Equations

Don't compare these two problems because 9.13 has an error. Check the errors in solution manual on the class website. :)
by Nandhini_2K
Thu Jan 31, 2019 1:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy
Replies: 4
Views: 87

Re: Standard Enthalpy

O2 is 0 at standard state. All diatomic elements such as N2, O2, H2, will be zero and any single element from the periodic table.
by Nandhini_2K
Thu Jan 31, 2019 12:59 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 2
Views: 68

Re: Bond Enthalpies

When we're solving for Enthalpy using standard enthalpy of formation method pure substances are zero.
by Nandhini_2K
Wed Jan 30, 2019 5:43 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Best Method
Replies: 7
Views: 137

Re: Best Method

I think it really depends on what is given in the problem already.
by Nandhini_2K
Sun Jan 27, 2019 12:35 am
Forum: Phase Changes & Related Calculations
Topic: Due date for Discussion Questions
Replies: 8
Views: 128

Re: Due date for Discussion Questions

Due Sunday at 11:59pm
by Nandhini_2K
Sat Jan 26, 2019 6:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka
Replies: 6
Views: 114

Re: Ka

The higher the Ka value the weaker the acid. Since H2SO4 doesn't have a ka value at all it is a strong acid.
by Nandhini_2K
Fri Jan 25, 2019 12:15 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Quiz #1 This friday
Replies: 5
Views: 150

Re: Quiz #1 This friday

Practice problems from homework, the audio-visual focus topic post-assessment, and UA workshop worksheets.
by Nandhini_2K
Thu Jan 24, 2019 10:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1
Replies: 8
Views: 159

Re: Test 1

My Plf recommended memorizing this list.
by Nandhini_2K
Fri Jan 18, 2019 7:46 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring solids
Replies: 6
Views: 104

Re: ignoring solids

Solids and Liquids don't affect the reactant amount at equilibrium, so we leave them out.
by Nandhini_2K
Fri Jan 18, 2019 7:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1
Replies: 6
Views: 134

Re: Test 1

My TA said test 1 will be on Equilibrium and Acid & Base. Also, I doubt topics not discussed during the lecture will show up on the test.
by Nandhini_2K
Fri Jan 18, 2019 7:29 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Catalysts
Replies: 7
Views: 110

Re: Catalysts

Catalysts has no effect on the Equilibrium composition, but simply speeds up the process to Equilibrium.
by Nandhini_2K
Sun Jan 13, 2019 9:55 pm
Forum: Ideal Gases
Topic: R [ENDORSED]
Replies: 5
Views: 97

Re: R [ENDORSED]

R = 0.0821 atm x L / mol x K
by Nandhini_2K
Sun Jan 13, 2019 9:53 pm
Forum: Student Social/Study Group
Topic: New to Lavelle
Replies: 32
Views: 616

Re: New to Lavelle

I take sessions with AAP for this class, doing homework and practice problems works best for me.
by Nandhini_2K
Sat Jan 12, 2019 10:02 pm
Forum: Ideal Gases
Topic: bar or atm
Replies: 8
Views: 139

Re: bar or atm

I think Bar and atm are used interchangeably because the values are close.
by Nandhini_2K
Tue Jun 12, 2018 12:47 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903301

Re: Post All Chemistry Jokes Here

Caution don't trip!
by Nandhini_2K
Tue Jun 12, 2018 12:43 am
Forum: General Science Questions
Topic: Sig Figs
Replies: 9
Views: 836

Re: Sig Figs

I round my final solution to keep my answer most accurate as possible.
by Nandhini_2K
Tue Jun 12, 2018 12:41 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: final [ENDORSED]
Replies: 4
Views: 299

Re: final [ENDORSED]

Yea I don't remember this being covered so probably not
by Nandhini_2K
Sat Jun 02, 2018 4:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 228

Re: Bond Angles

We don't need to remember the special cases just the main ones.
by Nandhini_2K
Sat Jun 02, 2018 4:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming shape
Replies: 7
Views: 213

Re: Naming shape

Should look at its VSPER formula and that will take both the lone pairs and bonds into consideration to determine the shape.
by Nandhini_2K
Tue May 29, 2018 2:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Drawing
Replies: 7
Views: 222

Re: VSEPR Drawing

We don’t need to draw the geometric shapes, but we should know how it looks and it’s lewis structure.
by Nandhini_2K
Sun May 27, 2018 1:05 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903301

Re: Post All Chemistry Jokes Here

What do you call a clown who's in jail? A silicon.
by Nandhini_2K
Sun May 27, 2018 1:03 am
Forum: Resonance Structures
Topic: ranking
Replies: 11
Views: 452

Re: ranking

By formal charge starting from the lowest close to the zero.
by Nandhini_2K
Sat May 26, 2018 1:19 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Why do lone pairs occupy the most space? [ENDORSED]
Replies: 3
Views: 214

Re: Why do lone pairs occupy the most space? [ENDORSED]

The lone pair is more excited than bonding electron pairs.
by Nandhini_2K
Fri May 18, 2018 9:52 pm
Forum: Formal Charge and Oxidation Numbers
Topic: 3.53
Replies: 4
Views: 267

Re: 3.53

Yes, that is correct. The formal charge as close to zero as possible and is not canceling out each other.
by Nandhini_2K
Thu May 17, 2018 6:46 pm
Forum: Electronegativity
Topic: Relationship between Electronegativity and Ionization Energy
Replies: 4
Views: 587

Re: Relationship between Electronegativity and Ionization Energy

The trend for electronegativity and Ionization energy is the same and because of that I think if the element has lower ionization energy it would also be low electronegativity.
by Nandhini_2K
Tue May 15, 2018 3:21 pm
Forum: Resonance Structures
Topic: CN- Resonance structures [ENDORSED]
Replies: 2
Views: 252

CN- Resonance structures [ENDORSED]

Can C have 1 Lone pair and 1 bond? Does this violate the octet rule?
by Nandhini_2K
Mon May 14, 2018 1:34 am
Forum: Ionic & Covalent Bonds
Topic: VALENCE ELECTRONS [ENDORSED]
Replies: 16
Views: 443

Re: VALENCE ELECTRONS [ENDORSED]

The number of valence electrons for each group.
by Nandhini_2K
Sun May 13, 2018 2:05 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903301

Re: Post All Chemistry Jokes Here

Making chemistry puns instead of doing actual work, more like...
by Nandhini_2K
Fri May 11, 2018 9:06 pm
Forum: Ionic & Covalent Bonds
Topic: HW problem 3.21
Replies: 4
Views: 169

Re: HW problem 3.21

The ground state electron configuration for Ag+ is [kr] 4d^10 and has no unpaired electrons. The ground state electron configuration for just Ag is [kr] 4d^9 5s^2 but remember we cannot have 4d^9. An electron from 5s^2 will transfer to 4d^9 to become stable. The 4d^9 will become 4d^10. The Ag+ is [k...
by Nandhini_2K
Sun May 06, 2018 8:41 pm
Forum: Trends in The Periodic Table
Topic: Difference between Periodic trends [ENDORSED]
Replies: 4
Views: 241

Difference between Periodic trends [ENDORSED]

What is the difference between Electron Affinity and Electronegativity both seem too similar? Are there any specific ways to distinguish them?
by Nandhini_2K
Sat May 05, 2018 5:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.43
Replies: 7
Views: 174

Re: 2.43

So how do we know when the element’s a “special case”? Do we only write, for example, 4d^10 5s^1 instead of 4d^9 5^2 when the element is near 4d^5 or 4d^10? All the elements in the column Cr and Cu have this special case, but e- configuration should never be 3d^4 and 3d^9 because it should change t...
by Nandhini_2K
Sat May 05, 2018 5:04 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: energy with s,p,d,f
Replies: 3
Views: 108

Re: energy with s,p,d,f

It goes from s,p,d,f.
s holds 2 electrons
p holds 6 electrons
d holds 10 electrons
f holds 12 electrons
by Nandhini_2K
Fri Apr 27, 2018 7:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Why does the 4s orbital come before the 3d?
Replies: 7
Views: 225

Re: Why does the 4s orbital come before the 3d?

The 4s orbitals are lower than 3d.
by Nandhini_2K
Thu Apr 26, 2018 8:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903301

Re: Post All Chemistry Jokes Here

What was Avogadro’s favorite board game?
Moleoply
by Nandhini_2K
Wed Apr 25, 2018 2:15 am
Forum: Einstein Equation
Topic: Chapter 1 Question 25 [ENDORSED]
Replies: 4
Views: 351

Re: Chapter 1 Question 25 [ENDORSED]

Yes, that is correct. You would take the E from part a (3.37 x 10^-19) multiply by Avogadro's number (6.022 x 10^23)
by Nandhini_2K
Sun Apr 22, 2018 6:13 pm
Forum: Significant Figures
Topic: Use of sigfigs
Replies: 8
Views: 334

Re: Use of sigfigs

We have to use sig figs to our final answer to every problem and the right units.
by Nandhini_2K
Fri Apr 20, 2018 10:17 pm
Forum: Empirical & Molecular Formulas
Topic: Test #1 Question
Replies: 7
Views: 362

Re: Test #1 Question

Can someone please tell me what they got for the first problem on this question. I thought I got it right, but it was marked wrong. (Either the molecular or empirical is fine since I can find out the other one). Thank you! I got that question marked down too because I missed an Oxygen. I believe th...
by Nandhini_2K
Wed Apr 18, 2018 9:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Number 1
Replies: 10
Views: 431

Re: Test Number 1

The class is not graded on a curve, but there's still two more tests, one midterm, and a final to catch up if you scored low.
by Nandhini_2K
Sun Apr 15, 2018 6:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903301

Re: Post All Chemistry Jokes Here

Why are chemists great for solving problems? They have all the solutions.
by Nandhini_2K
Sun Apr 15, 2018 6:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 39
Views: 37265

Re: Tutoring? [ENDORSED]

The workshop sessions provided by Prof Lavelle are similar to AAP
by Nandhini_2K
Tue Apr 10, 2018 7:48 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903301

Re: Post All Chemistry Jokes Here

Chemistry jokes are sodium funny
by Nandhini_2K
Tue Apr 10, 2018 7:44 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 91
Views: 9067

Re: All students read this sig fig post [ENDORSED]

This forum is very helpful!
by Nandhini_2K
Mon Apr 09, 2018 8:09 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 113
Views: 64097

Re: Rusty on High School Chem [ENDORSED]

Makes me feel better seeing many of you feel the same way as me. The first day of the lecture was overwhelming, but the UA step up, workshops, and the online video modules have been really helpful. Hoping that the tests are similar to the practice assessments on the video module.

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