Search found 29 matches

by BriannaParrington-1B
Sun Jun 10, 2018 1:47 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 455

Re: basics of hybridization

1. Draw the lewis structure of an atom. 2. Count the number of lone pairs. 3. Count the number of bond (a double bond and a triple bond count as 1 bond in this case). 4. Add up #2 and #3 and that gives you a number. 5. The number found in #4 corresponds to hybridization. For example, 2=SP, 3=SP^2, ...
by BriannaParrington-1B
Sun Jun 10, 2018 1:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes to Remember for the Final
Replies: 1
Views: 62

Molecular Shapes to Remember for the Final

Hello, I was wondering if there are specific molecular shapes we are to remember that are more important than others? Or is it important to remember all of them?
by BriannaParrington-1B
Sun Jun 10, 2018 1:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Help on HW#4.9 [ENDORSED]
Replies: 3
Views: 88

Help on HW#4.9 [ENDORSED]

For 4.9 I counted that the total of valence electrons of ICL3 was 28 electrons. When I drew the Lewis structure in order to figure out the molecular shape, I could only fit 26 electrons around all of the atoms when completing all of their octets. Therefore, I am assuming that Iodine has an expanded ...
by BriannaParrington-1B
Sun Jun 03, 2018 10:55 pm
Forum: Naming
Topic: Naming on Final
Replies: 8
Views: 271

Naming on Final

Is it true that we do not need to name on the final or did I misunderstand what Dr. Lavelle meant?
by BriannaParrington-1B
Sun Jun 03, 2018 10:51 pm
Forum: Hybridization
Topic: Sigma Bonds
Replies: 5
Views: 115

Sigma Bonds

What are the importance of sigma bonds?
by BriannaParrington-1B
Sun May 27, 2018 10:45 pm
Forum: Bond Lengths & Energies
Topic: Shorter bond length always leads to stronger bond?
Replies: 5
Views: 239

Re: Shorter bond length always leads to stronger bond?

What if two atoms have the same type of bond? (ie. a double bond). Does this mean that they have the same length and strength?
by BriannaParrington-1B
Sun May 27, 2018 10:43 pm
Forum: Bond Lengths & Energies
Topic: Test 3 bond length question
Replies: 8
Views: 274

Re: Test 3 bond length question

Additionally, part of the question was a comparison of two double bonds, each with two lone pairs. In this scenario, how would you discover which of the two bond lengths was longer? * Also, is it correct in thinking the lone pairs stretch out the bond length? I struggled thinking through this quest...
by BriannaParrington-1B
Sun May 27, 2018 10:40 pm
Forum: Resonance Structures
Topic: Radicals importance
Replies: 3
Views: 145

Radicals importance

Is there anything in particular that we must know about radicals other than how to identify them?
by BriannaParrington-1B
Sun May 27, 2018 10:33 pm
Forum: Resonance Structures
Topic: Contributing to Resonance Structures
Replies: 4
Views: 186

Re: Contributing to Resonance Structures

Whatever structure has the lowest energy state(such as the most favorable formal charge) contributes the most to resonance structure; so if all that separates equally low energy states is the position of a double bond, then showing all the alternate double bond positions would be the correct thing ...
by BriannaParrington-1B
Sun May 27, 2018 10:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR confusion
Replies: 8
Views: 185

VSEPR confusion

Can someone explain to me the concept of VSEPR?
by BriannaParrington-1B
Tue May 22, 2018 5:03 pm
Forum: Lewis Structures
Topic: confusion about # of bonds in a Lewis structure
Replies: 2
Views: 83

Re: confusion about # of bonds in a Lewis structure

I'm pretty sure the answer relates to formal charge. The correct lewis structure is the one that minimizes formal charge while at the same time maintaining the octet rule for elements that cannot break it. Using your example of oxygen, if we calculate the formal charge for an oxygen with 3 lone pai...
by BriannaParrington-1B
Tue May 22, 2018 4:55 pm
Forum: Lewis Structures
Topic: lowest energy & most stable Lewis structures
Replies: 4
Views: 254

lowest energy & most stable Lewis structures

what determines the lowest energy of a Lewis structure? What does it mean when it asks to draw the most stable lewis structure? Does the amount of bonds or lone pairs present in a lewis structure determine the energy or stability?
by BriannaParrington-1B
Tue May 22, 2018 4:52 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge vs Oxidation Numbers
Replies: 2
Views: 149

Formal Charge vs Oxidation Numbers

what is the difference between formal charge and oxidation numbers? Do they relate to each other in any way?
by BriannaParrington-1B
Tue May 22, 2018 4:49 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 13
Views: 432

Re: Radicals

Just to add to this discussion, from my knowledge, if you were to count the number of valence electrons in a compound such as NO, nitrogen has 5 valence electrons and oxygen has 6 valence electrons. In total, the entire compound's total valence electron is 11. Therefore, there must be an electron th...
by BriannaParrington-1B
Tue May 22, 2018 4:40 pm
Forum: Ionic & Covalent Bonds
Topic: ionic character
Replies: 10
Views: 185

Re: ionic character

If the trend of electronegativity is highest to the upper right of the periodic table, does that mean that electronegativity is the least in the bottom left corner of the periodic table? Is there a specific trend we are supposed to know besides the highest electronegativity being in the upper right ...
by BriannaParrington-1B
Tue May 22, 2018 4:36 pm
Forum: Lewis Structures
Topic: confusion about # of bonds in a Lewis structure
Replies: 2
Views: 83

confusion about # of bonds in a Lewis structure

Why is it that some elements form more bonds than others in an octet? What difference does it make if an oxygen atom completes its octet using a double bond and two lone pairs versus an oxygen atom completing its octet using a single bond and three lone pairs?
by BriannaParrington-1B
Sat May 12, 2018 12:40 pm
Forum: Trends in The Periodic Table
Topic: electron affinity vs electronegativity?
Replies: 2
Views: 364

electron affinity vs electronegativity?

Hello, can someone please explain to me the difference between electron affinity and electronegativity? What makes them different and what are their trends?
by BriannaParrington-1B
Sat May 12, 2018 12:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: homework 2.43 part e [ENDORSED]
Replies: 8
Views: 262

Re: homework 2.43 part e [ENDORSED]

Doesn't 4f^14 come first because when doing electron configurations, you list it in increasing principal quantum number(n)?
by BriannaParrington-1B
Sat May 05, 2018 8:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes and Nodal Planes
Replies: 1
Views: 68

Nodes and Nodal Planes

What is the correlation between nodes and nodal planes and how can there be multiple nodal planes?
by BriannaParrington-1B
Sat May 05, 2018 8:13 pm
Forum: Quantum Numbers and The H-Atom
Topic: Energy levels and Orbitals
Replies: 3
Views: 159

Re: Energy levels and Orbitals

Hi, I believe what the series describe are Principle quantum numbers(n), or shells as it's usually called. Shells determine the energy levels. Angular momentum quantum number(l) describes the orbital/shape of the subshells (I=0,1,2,3 corresponding to s,p,d,f), and each shell can contain several sub...
by BriannaParrington-1B
Sun Apr 29, 2018 11:39 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: The concept of Orbitals
Replies: 12
Views: 252

The concept of Orbitals

I am confused about the concept of orbitals. Are orbitals energy levels of electrons and what makes them significant and different from each other? What is the significance of nodal planes in different orbitals??
by BriannaParrington-1B
Sun Apr 15, 2018 8:30 pm
Forum: Photoelectric Effect
Topic: Kinetic Energy [ENDORSED]
Replies: 2
Views: 81

Kinetic Energy [ENDORSED]

Is the concept of kinetic energy is the excess energy after a light hits a metal surface and the energy required to eject electron(s) using the light (photons) is more than needed?
by BriannaParrington-1B
Sun Apr 15, 2018 8:27 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Confusion about Atomic Spectroscopy [ENDORSED]
Replies: 3
Views: 131

Confusion about Atomic Spectroscopy [ENDORSED]

I am confused about the concept of atomic spectroscopy. Can someone clear up this misconception for me? Thanks.
by BriannaParrington-1B
Sun Apr 15, 2018 1:04 pm
Forum: Properties of Light
Topic: Properties of Light [ENDORSED]
Replies: 5
Views: 144

Properties of Light [ENDORSED]

Is the concept of light is that light acts with individual photons rather than acting like a wave?
by BriannaParrington-1B
Sun Apr 15, 2018 12:58 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition [ENDORSED]
Replies: 2
Views: 101

Bohr Frequency Condition [ENDORSED]

Can someone explain to me Bohr's Frequency Condition?
by BriannaParrington-1B
Fri Apr 06, 2018 1:26 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 90
Views: 7729

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

If a a question such as F.5 asks for the mass percentage composition, but does not specify any numbers that would give a basis for how many sig figs I need in my answer, do I just use the usual methods for rounding off even though there are not a certain number of sig figs specified to use? Also, wh...
by BriannaParrington-1B
Fri Apr 06, 2018 1:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Dimensional Analysis Help [ENDORSED]
Replies: 6
Views: 240

Dimensional Analysis Help [ENDORSED]

What is the easiest way to perform dimensional analysis on chem problem? How do you know when to do dimensional analysis and when it is not needed?
by BriannaParrington-1B
Fri Apr 06, 2018 12:51 pm
Forum: SI Units, Unit Conversions
Topic: Confusion about Significant Figures (F.5)
Replies: 2
Views: 118

Confusion about Significant Figures (F.5)

For a general problem such as finding the mass composition of a compound, is there a certain amount of significant figures that each answer has to have? Or do I just use the rules for rounding off and disregard the number of significant figures? I am also concerned about the mass composition needing...

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