Search found 32 matches

by Chloe Orsini 1K
Sat Dec 08, 2018 12:53 pm
Forum: Ionic & Covalent Bonds
Topic: SiO2
Replies: 1
Views: 85

SiO2

Why is SiO2 polar?
by Chloe Orsini 1K
Sat Dec 08, 2018 9:56 am
Forum: Empirical & Molecular Formulas
Topic: Midterm Solution
Replies: 1
Views: 153

Midterm Solution

I am looking at question number two on the midterm and I am confused by the solution. For the ratios it says they are 1.4:1.2:1
To get 1.4 you divide the moles of co2 by the moles of o2
But to get 1.2 you have to divide the grams of H2O by the moles of O2

Why would you do this?
by Chloe Orsini 1K
Thu Nov 29, 2018 4:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Carbon monoxide
Replies: 1
Views: 43

Carbon monoxide

Why is carbon monoxide more stable with a triple bond?
by Chloe Orsini 1K
Wed Nov 28, 2018 7:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.21
Replies: 2
Views: 39

4.21

In 4.21 part D why do we not use a triple bond between the N atoms?
by Chloe Orsini 1K
Wed Nov 28, 2018 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.95
Replies: 1
Views: 47

4.95

Will someone explain to me part b of this question when it uses sigma(H1s, C2sp2) as the example. Thanks!
by Chloe Orsini 1K
Wed Nov 28, 2018 7:37 pm
Forum: Hybridization
Topic: Sp3d or dsp3
Replies: 4
Views: 108

Sp3d or dsp3

Is it sp3d or dsp3 in the book it’s sp3d but on here and other places I’ve seen it as dsp3, which one is it?
by Chloe Orsini 1K
Tue Nov 27, 2018 4:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 3.39
Replies: 2
Views: 67

3.39

The answer key has the "ion" separate from the compound. For example, for ammonium chloride, NH4 is in brackets and outside of the brackets is the Cl- ion, can someone please explain this to me, thank you!
by Chloe Orsini 1K
Tue Nov 27, 2018 4:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 3.119
Replies: 2
Views: 40

Question 3.119

This is also in example box 3.5, but the lewis structure for ozone has one single and one double bond. Is the reason why there is one bond length, because of resonance? Because you can draw two lewis structures with different orientations does the bond length come out as one length in between that o...
by Chloe Orsini 1K
Tue Nov 27, 2018 4:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi bonds
Replies: 2
Views: 32

Sigma and Pi bonds

Will someone just explain the difference between sigma and pi bonds and the significance/importance of them please?
by Chloe Orsini 1K
Tue Nov 27, 2018 4:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi bonds
Replies: 4
Views: 98

Sigma and Pi bonds

Will someone just explain the difference between sigma and pi bonds and the significance/importance of them please?
by Chloe Orsini 1K
Thu Nov 15, 2018 1:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole Moment
Replies: 1
Views: 41

Dipole Moment

Will someone please explain what this is and how to determine the size of it, thanks!
by Chloe Orsini 1K
Thu Nov 15, 2018 1:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Coordination Number
Replies: 1
Views: 50

Re: Coordination Number

Coordination numbers are normally between two and nine. The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. Probably due to some very specific scenario(s) you could have one. But for simplicity and the sake of this class I would say no.
by Chloe Orsini 1K
Wed Nov 14, 2018 3:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 4.11
Replies: 2
Views: 40

Question 4.11

For the lewis structure for SCl4 why do we add two electrons to the Sulfur atom instead of just adding two double bonds?
by Chloe Orsini 1K
Thu Nov 08, 2018 4:55 pm
Forum: Dipole Moments
Topic: Interaction Potential Energy
Replies: 4
Views: 89

Re: Interaction Potential Energy

I think at most you may be asked a conceptual question in the future, but I wouldn't stress about the math.
by Chloe Orsini 1K
Thu Nov 08, 2018 4:53 pm
Forum: Bond Lengths & Energies
Topic: Tests
Replies: 5
Views: 133

Tests

Just to check we only have one more test and the final, there is no second midterm for this class, correct?
by Chloe Orsini 1K
Thu Nov 08, 2018 4:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Which chapters can we do for homework?
Replies: 3
Views: 145

Re: Which chapters can we do for homework?

It depends on your TA, but I don't think it matters too much as long as you're doing problems from the recent chapters, and not repeating homework problems. I don't see there being a problem with you doing problems from chapter 3.
by Chloe Orsini 1K
Thu Nov 01, 2018 10:38 pm
Forum: Ionic & Covalent Bonds
Topic: Group Me
Replies: 2
Views: 69

Group Me

https://groupme.com/join_group/45669884/x5yZf5

Here is a link for a class group me! Ive done this in other classes and thought it was helpful! Y'all can add yourselves and form study groups, ask questions, etc.
by Chloe Orsini 1K
Thu Nov 01, 2018 10:33 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm study
Replies: 7
Views: 232

Re: Midterm study

I was thinking of doing a massive group me! We can use it to get together and study or ask questions and stuff like that! I could make one and add y'all and then you guys could add your friends who are interested too, does this work?
by Chloe Orsini 1K
Wed Oct 31, 2018 2:29 pm
Forum: Ionic & Covalent Bonds
Topic: octet rule
Replies: 11
Views: 201

octet rule

Will someone just re-explain the octet rule and its importance, I feel like i'm missing something.
by Chloe Orsini 1K
Tue Oct 30, 2018 11:47 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm study
Replies: 7
Views: 232

Midterm study

I was wondering if anyone was wanting to get a study group together! If you're interested you could respond with your name and we could get a group me started.
by Chloe Orsini 1K
Thu Oct 25, 2018 1:47 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneracy
Replies: 7
Views: 303

Re: Degeneracy

I looked this up to try to help and online all it said was to square the value of n, so if n=3 than the degeneracy is 9, is this correct?
by Chloe Orsini 1K
Thu Oct 25, 2018 1:37 pm
Forum: Properties of Light
Topic: Chapter 1 number 33
Replies: 2
Views: 118

Chapter 1 number 33

Why in question number 33 do we add 1/2 MV^2 to the amount of energy found in part B?
by Chloe Orsini 1K
Tue Oct 23, 2018 2:15 pm
Forum: Properties of Light
Topic: Test 2
Replies: 7
Views: 248

Test 2

Is the second test just on the quantum calculation stuff or will we also need to know the stuff regarding orbitals?
by Chloe Orsini 1K
Thu Oct 18, 2018 5:51 pm
Forum: DeBroglie Equation
Topic: Energy=pc
Replies: 4
Views: 108

Re: Energy=pc

You can't treat these equations equally, in other words you cant just add an exponent or multiply by one half. If you tried to equate 1/2mv^2 it would look like 1/2pc^2. I see what you're saying because p=mv. However, in the first equation you're squaring velocity, but not squaring mass. You can't s...
by Chloe Orsini 1K
Wed Oct 17, 2018 3:45 pm
Forum: Properties of Light
Topic: 1.17
Replies: 1
Views: 41

1.17

For this question why do we multiply by four? I know to find the frequency we multiply R by (1/n1^2)-(1/n2^2). But in the answer it is also multiplied by four. I think it has to do with z^2 in the question, but i'm still confused.
by Chloe Orsini 1K
Wed Oct 17, 2018 3:22 pm
Forum: *Shrodinger Equation
Topic: Test 2
Replies: 5
Views: 275

Re: Test 2

I'm pretty sure test two covers outline two. It's the stuff from the first chapter so I would just be sure to do the problems in chapter one that he has assigned!
by Chloe Orsini 1K
Thu Oct 11, 2018 1:53 pm
Forum: Properties of Electrons
Topic: Exercise 1B 19
Replies: 2
Views: 96

Re: Exercise 1B 19

A lot of people seem to also be struggling between using the debroglie equation and kinetic energy. The equation you attempted to use does not allow us to solve for wavelength. The de broglie equation λ = h/mv, uses plancks constant, mass, and velocity to solve for wavelength.
by Chloe Orsini 1K
Thu Oct 11, 2018 1:42 pm
Forum: *Shrodinger Equation
Topic: Wavefunction
Replies: 3
Views: 114

Re: Wavefunction

The wave function predicts statistically where an electron will be at a certain time. The wave function is a probability so it is still largely a "theory" which makes it difficult to understand. However, an orbital is a mathematical function that describes the wave-like behavior of the ele...
by Chloe Orsini 1K
Thu Oct 11, 2018 1:34 pm
Forum: DeBroglie Equation
Topic: Homework Question 1.33 (6th Ed)
Replies: 2
Views: 66

Re: Homework Question 1.33 (6th Ed)

The Debrogile equation solves for wavelength using Planck's constant, the mass of a particle, and velocity. The velocity is given in the problem, and 9.10938356 × 10-31 kilograms is the mass of an electron (which can just be googled honestly). So you you just divide plancks constant by the velocity ...
by Chloe Orsini 1K
Wed Oct 03, 2018 3:24 pm
Forum: Limiting Reactant Calculations
Topic: Syllabus/Homework
Replies: 1
Views: 86

Syllabus/Homework

The first section of the syllabus includes E,F,G,H,L, and M. Are sections L and M also considered review or are these new topics?
by Chloe Orsini 1K
Tue Oct 02, 2018 1:40 pm
Forum: Molarity, Solutions, Dilutions
Topic: E3 (sixth edition
Replies: 1
Views: 80

E3 (sixth edition

For this problem it asks you to balance to sides of a scale for two types of atoms of different molar masses. On each side in the image are 9 circles, im assuming representing the atoms. For this problem do we assume there are 9 gallium atoms and then use the molar masses to find the number of astat...
by Chloe Orsini 1K
Mon Oct 01, 2018 9:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E 23 Part C sixth edition
Replies: 2
Views: 65

E 23 Part C sixth edition

In this problem it states: F- ions in 25.2 kg of UF6 I started by converting 25.2 kgs into grams and then calculating the molar mass as 352.017 g*mol^-1. I then divided 25200 by 352.017 and got 71.587 The answer multiplies this answer by 6 moles of F-1 to get 430 moles Is this because it is F6 in th...

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