Search found 31 matches

by KylieY_3B
Sat Dec 08, 2018 9:50 pm
Forum: Naming
Topic: Do we need to know the ligand (en)?
Replies: 2
Views: 76

Re: Do we need to know the ligand (en)?

I think knowing the name (ethylenediamine) is necessary, but not the formula.
by KylieY_3B
Sat Dec 08, 2018 9:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 3
Views: 120

Re: Bond angles

I believe writing 90 degrees would be sufficient.
by KylieY_3B
Sat Dec 08, 2018 8:29 pm
Forum: Naming
Topic: Shorthands
Replies: 2
Views: 54

Shorthands

When writing out the full name for coordinate compounds which include a ligand such as ethylenediamine (en), can we still use the shorthand or do we have to remember the actual names?
by KylieY_3B
Wed Dec 05, 2018 12:12 am
Forum: Bronsted Acids & Bases
Topic: Memorizing Acid and Bases
Replies: 2
Views: 57

Re: Memorizing Acid and Bases

The most common ones are good to know, I think doing the homework will make it clear which ones come up the most.
by KylieY_3B
Wed Dec 05, 2018 12:11 am
Forum: Naming
Topic: 6th Edition 29c
Replies: 3
Views: 47

Re: 6th Edition 29c

Okay thank you!
by KylieY_3B
Mon Dec 03, 2018 7:30 pm
Forum: Naming
Topic: 6th Edition 29c
Replies: 3
Views: 47

6th Edition 29c

Hi, could someone explain why [Co(CN)5(OH2)]^2- has aqua in front of the rest of its name in the answer key?
by KylieY_3B
Tue Nov 27, 2018 10:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 3.39
Replies: 2
Views: 67

Re: 3.39

I believe when typically drawing lewis structures for ionic compounds, you include the ions in brackets to distinguish them from covalent compounds.
by KylieY_3B
Tue Nov 27, 2018 10:57 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 4.17
Replies: 3
Views: 79

Re: 4.17

The formal charge is closer to 0 for the central oxygen atom when it has a lone pair and one double bond and one single bond.
by KylieY_3B
Tue Nov 27, 2018 10:54 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 4.46
Replies: 4
Views: 111

Re: 4.46

I believe it's for the entire molecule.
by KylieY_3B
Mon Nov 19, 2018 11:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Help w/ 4.19 (6th edition)
Replies: 2
Views: 52

Help w/ 4.19 (6th edition)

For part b, I've been having difficulty with part b, which is the molecule (CH3)2Be. I understand the basic molecular shape and geometry, but I'm not sure I understand the Lewis structure. From what I've looked up, Be has single bonds with Carbon but no lone pairs. How is this possible if Be doesn't...
by KylieY_3B
Sun Nov 18, 2018 10:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Multiple different bond angles
Replies: 6
Views: 78

Re: Multiple different bond angles

whitneyh_4_4G wrote:If you click on this link you can download a software that shows molecules in 3D and you can move them around so you have a better idea of the shapes and angles! If that doesn't help you with remembering molecule bond angles for different shapes then I would just memorize them.


Wow! Thank you!
by KylieY_3B
Sun Nov 18, 2018 9:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Multiple different bond angles
Replies: 6
Views: 78

Re: Multiple different bond angles

TeCl4 has different bond angles because of its molecular geometry. It has seesaw geometry, since it has 4 single bonds and one lone pair. All seesaw geometries will have 90, 120, and 180 degree angles in their 3-D shape. If you look at a picture of "seesaw geometry" you can see each of th...
by KylieY_3B
Sun Nov 18, 2018 8:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Multiple different bond angles
Replies: 6
Views: 78

Multiple different bond angles

Why do some structures have bond angles of different degrees? For example, in my discussion section we used the example of TeCl4 as having angles of both 120 degrees and 90 degrees. Also, how do we determine when this is the case?
by KylieY_3B
Sun Nov 11, 2018 8:16 pm
Forum: Electronegativity
Topic: Help with 2.35 (6th edition)
Replies: 1
Views: 131

Help with 2.35 (6th edition)

Could someone explain how to approach 2.35?

Here is the text: 2.35 (a) Write an expression for the total coulombic potential energy for a lithium atom. (b) What does each individual term represent?
by KylieY_3B
Fri Nov 09, 2018 2:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming the molecular shape
Replies: 4
Views: 80

Re: Naming the molecular shape

I think lone pairs matter when drawing the Lewis structure (since shape is based off of Lewis structure) but nomenclature is based off of number of bonds and angle. So you still have to be aware of the lone pairs, it's just not a necessity for the naming specifically.
by KylieY_3B
Sun Nov 04, 2018 7:56 pm
Forum: Lewis Structures
Topic: Double bonds vs. lone pairs
Replies: 5
Views: 47

Double bonds vs. lone pairs

When drawing a Lewis dot structure, how do we know when to draw a molecule with double bonds or when to draw in lone pairs?

For example, CH2Cl2 has 20 valence electrons, but how do we know whether to draw Carbon and Chlorine with double bonds or to draw in lone pairs for chlorine?
by KylieY_3B
Wed Oct 31, 2018 6:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneration
Replies: 3
Views: 115

Re: Degeneration

Degenerate atomic orbitals are orbitals that have the same energy level.
by KylieY_3B
Wed Oct 31, 2018 6:41 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test #2 Question #2
Replies: 3
Views: 243

Re: Midterm Question #2

So you would use the Heisenberg indeterminancy equation, which is (uncertainty in momentum) * (uncertainty in position) is greater than h/4pi. Momentum is mass times velocity so you would need to multiply its velocity (which is given) by it's weight (also given). Since the given velocity is in mph y...
by KylieY_3B
Wed Oct 31, 2018 6:36 pm
Forum: *Shrodinger Equation
Topic: Midterm
Replies: 6
Views: 277

Re: Midterm

I think if there's a review session including it, it's fair game for the midterm. But it won't be a calculation question, it would probably be a conceptual question.
by KylieY_3B
Wed Oct 31, 2018 6:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Can someone explain Te2-?
Replies: 2
Views: 155

Re: Can someone explain Te2-?

Thank you! My TA in discussion yesterday also confirmed this, so we know for sure it's true now.
by KylieY_3B
Tue Oct 30, 2018 9:30 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Can someone explain Te2-?
Replies: 2
Views: 155

Can someone explain Te2-?

This is from homework problem 3.21 c from the 6th edition. The shorthand used for Te 2- is [Xe], which comes after tellurium in the periodic table. When does an ion use the noble gas that comes before in its electron configuration and when does it use the noble gas which comes afterwards? Sorry, I d...
by KylieY_3B
Mon Oct 22, 2018 8:49 pm
Forum: DeBroglie Equation
Topic: Can't quite get the answer right
Replies: 2
Views: 90

Re: Can't quite get the answer right

Ahh, yes, that's it. Thank you!
by KylieY_3B
Mon Oct 22, 2018 7:41 pm
Forum: DeBroglie Equation
Topic: Can't quite get the answer right
Replies: 2
Views: 90

Can't quite get the answer right

For question 1.39 in the 6th edition I've been having serious issues getting the correct answer while using De Broglie's Equation. The conversions I've been using is the given 1 ounce = 28.3 grams, 1609 meters = 1 mile and 60 sec = 1 hour. The answer supplied at the back of the textbook lists it as ...
by KylieY_3B
Mon Oct 22, 2018 6:47 pm
Forum: Photoelectric Effect
Topic: Help with 33 (6th edition) [ENDORSED]
Replies: 3
Views: 131

Re: Help with 33 (6th edition) [ENDORSED]

Thank you!

For part B (determining how much energy needed to remove electron from metal surface), would I use the equation Ek = .5 (Me)(Ve)^2?
by KylieY_3B
Sun Oct 21, 2018 12:20 pm
Forum: Photoelectric Effect
Topic: Help with 33 (6th edition) [ENDORSED]
Replies: 3
Views: 131

Help with 33 (6th edition) [ENDORSED]

Could someone explain how to solve HW problem 33? In particular part A is causing me trouble.

Chemistry Community won't let me copy and paste the text of a question but it essentially asks to find the wavelength of an emitted electron with a velocity of 3600 kilometers per second.
by KylieY_3B
Fri Oct 12, 2018 6:05 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 2
Views: 62

Re: Photoelectric Effect

I think the maximum would be 1 million electrons, because there is a 1:1 ratio of photons to electrons in terms of energy. Each photon has enough energy to eject one electron and no more.
by KylieY_3B
Fri Oct 12, 2018 5:56 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum: Colors
Replies: 3
Views: 48

Re: Electromagnetic Spectrum: Colors

I'm not completely sure how scientists would officially classify it, but I believe that each human sees light slightly differently depending on their biology. The exact wavelength range for each color is an approximate because some people (and languages!) define the threshold between color in differ...
by KylieY_3B
Thu Oct 11, 2018 9:57 pm
Forum: Properties of Light
Topic: Explaining answer for 1.3
Replies: 4
Views: 73

Explaining answer for 1.3

Hi, I'm curious about the reasoning for the answer to question 1.3 (6th edition). The question is "Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning." I understand why most of the scenarios don't happen, except c) "The ext...
by KylieY_3B
Thu Oct 04, 2018 11:47 pm
Forum: SI Units, Unit Conversions
Topic: 6th Edition E27, First Part
Replies: 5
Views: 73

Re: 6th Edition E27, First Part

You divide 1 H2O molecule by Avogadro's constant (6.02 * 10^23) to convert to moles, then multiple by molar mass to convert to grams.
by KylieY_3B
Thu Oct 04, 2018 11:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: (Typo??) HW L.35 - 7th edition
Replies: 3
Views: 146

Re: (Typo??) HW L.35 - 7th edition

I have the 6th edition and it's Fe3Br8 for me. It's probably a typo.
by KylieY_3B
Mon Oct 01, 2018 4:48 pm
Forum: Balancing Chemical Reactions
Topic: Need help w/ determining the moles of gas produced
Replies: 2
Views: 58

Need help w/ determining the moles of gas produced

Could someone explain how to find the net number of moles of gas produced for number 19 on the second review module? It involves the combustion of 4 moles of butane (C4H10) gas. I understand how to balance the equation but I'm unsure how to determine the net number of moles of gas produced. The poss...

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