Search found 19 matches

by Solene Poulhazan
Sat Jun 09, 2018 4:10 pm
Forum: Lewis Acids & Bases
Topic: Final Layout
Replies: 2
Views: 191

Re: Final Layout

If you search with the key word "French Toast" you can access the practice final exam. This could be useful in determining how the real final will be. Chem Mod: This is incorrect. French Toast gives practice problems but is not indicative of how the final will be structured. Your final wil...
by Solene Poulhazan
Sat Jun 09, 2018 2:36 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number
Replies: 5
Views: 367

Oxidation Number

I'm a little unclear about oxidation numbers. How do I calculate them and how does knowing this help describe coordination compounds?
by Solene Poulhazan
Wed May 30, 2018 4:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Px, Py, and Pz
Replies: 2
Views: 142

Re: Px, Py, and Pz

I'm a little confused about hybridization as well. How does this relate to these orbitals?
by Solene Poulhazan
Tue May 29, 2018 3:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1166750

Re: Post All Chemistry Jokes Here

Why do chemists like nitrates so much?
They're cheaper than day rates.
by Solene Poulhazan
Tue May 29, 2018 3:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: single electron and shape
Replies: 3
Views: 109

Re: single electron and shape

I'm not sure If I understand the question, but I found a chart on molecular shapes that may be useful for you!
Hope this helps!
8c76d0df9e1d578b46a2d8fb02bf7f24.png
Molecular Shape
by Solene Poulhazan
Tue May 29, 2018 3:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: General Molecular Shape
Replies: 3
Views: 146

Re: General Molecular Shape

You can look at the number of electron groups and the number of bonding groups (and lone pairs). This will help you identify the molecular shape.
by Solene Poulhazan
Mon May 28, 2018 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HW 4.9
Replies: 10
Views: 753

Re: HW 4.9

This is t-shaped because there are 5 electron groups, 3 bonding groups and 2 lone pairs. A trigonal planar arrangement only has 3 electron groups.
by Solene Poulhazan
Mon May 28, 2018 7:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles and lone pairs
Replies: 4
Views: 296

Re: Bond angles and lone pairs

The less there are of bonding groups, the more lone pairs are present.
by Solene Poulhazan
Mon May 28, 2018 7:32 pm
Forum: Hybridization
Topic: hybridization example
Replies: 3
Views: 160

Re: hybridization example

Is this something we need to know for the exam?
by Solene Poulhazan
Wed May 23, 2018 4:14 pm
Forum: Ionic & Covalent Bonds
Topic: negative charges and lewis structures
Replies: 3
Views: 172

Re: negative charges and lewis structures

This represents the overall charge of the molecule.
by Solene Poulhazan
Wed May 23, 2018 4:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: shape of water
Replies: 8
Views: 273

Re: shape of water

Water has 8 electrons around the central oxygen atom. This means there are four electron pairs arranged in a tetrahedral shape. There are two bonding pairs and two lone pairs.
by Solene Poulhazan
Wed May 23, 2018 4:08 pm
Forum: Bond Lengths & Energies
Topic: bond length and charge
Replies: 3
Views: 464

Re: bond length and charge

In terms of electronegativity: the greater the electronegativity difference, the greater the bond polarity and therefor the greater the bond strength will be.
by Solene Poulhazan
Wed May 23, 2018 12:25 pm
Forum: Lewis Structures
Topic: Homework 3.39 part b
Replies: 2
Views: 163

Re: Homework 3.39 part b

Once you find the number of valence electrons for each element in the compound, you can figure out how many bonds need to be formed for each element.
by Solene Poulhazan
Wed May 02, 2018 10:13 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework 2.43
Replies: 2
Views: 146

Re: Homework 2.43

Are there more exceptions to electron configurations other than chromium and copper?
by Solene Poulhazan
Wed May 02, 2018 10:06 pm
Forum: Trends in The Periodic Table
Topic: electron affinity vs ionization energy
Replies: 2
Views: 150

Re: electron affinity vs ionization energy

I believe that we can just follow the same trends for both of these concepts. For electron affinity and ionization energy, it increases across a period and decreases down a group.
by Solene Poulhazan
Sun Apr 22, 2018 10:06 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: ∆P and ∆X
Replies: 5
Views: 282

Re: ∆P and ∆X

For which formula do we need to use ∆P and ∆X in?
by Solene Poulhazan
Sun Apr 22, 2018 1:57 pm
Forum: Photoelectric Effect
Topic: Homework Problem #33
Replies: 4
Views: 189

Re: Homework Problem #33

I think the equation you are looking for is simply E=hv
by Solene Poulhazan
Sun Apr 22, 2018 1:54 pm
Forum: Properties of Light
Topic: 1.25 [ENDORSED]
Replies: 1
Views: 429

Re: 1.25 [ENDORSED]

a)
wavelength = 589nm convert it to m, 5.89 x10^-7 m

Then, you can use the formula E= hc/wavelength

E = (6.626 x 10^-34)(2.99 x 10^8) / (5.89 x 10^-7)
= 3.37 x 10^-19 J
by Solene Poulhazan
Sun Apr 22, 2018 1:52 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Different element in Rydberg
Replies: 4
Views: 200

Re: Different element in Rydberg

I don't think the model that we have learned this far, meaning the rydberg equation, allows us to do so.

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