Search found 29 matches

by salvadoralvizo1J
Sun Jun 10, 2018 11:58 pm
Forum: Sigma & Pi Bonds
Topic: pi and sigma bonds
Replies: 2
Views: 220

pi and sigma bonds

Which is stronger/harder to break: sigma or pi bonds?
by salvadoralvizo1J
Sun Jun 10, 2018 11:56 pm
Forum: Sigma & Pi Bonds
Topic: four bonds
Replies: 3
Views: 257

four bonds

How many sigma and pi bonds are present in a molecule with 4 bonds??
by salvadoralvizo1J
Sun Jun 10, 2018 11:55 pm
Forum: Electronegativity
Topic: electronegativity chart
Replies: 11
Views: 699

Re: electronegativity chart

No, he will probably provide us with one on the exam if we even need one. It's important to know the general trend is anything and that Fl is the most electronegative atom.
by salvadoralvizo1J
Sun Jun 10, 2018 11:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: final [ENDORSED]
Replies: 1
Views: 101

final [ENDORSED]

We're not expected to know the MO theory right? i know he mentioned it briefly in class...
by salvadoralvizo1J
Sun Jun 10, 2018 11:51 pm
Forum: Conjugate Acids & Bases
Topic: Acids and Bases
Replies: 2
Views: 203

Re: Acids and Bases

Whatt exactly do you mean by split? i know that strong acids tend to disassociate in water completely.
by salvadoralvizo1J
Sun Jun 10, 2018 11:49 pm
Forum: Hybridization
Topic: Chapter 4 [ENDORSED]
Replies: 4
Views: 281

Re: Chapter 4 [ENDORSED]

This has to do with cis and trans configuration. If the dipole bonds are on the same side of the molecule [cis], then its polar. If the bonds are on opposite sides of the molecule [trans] , it's nonpolar because they cancel!
by salvadoralvizo1J
Sun Jun 10, 2018 11:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Help on HW#4.9 [ENDORSED]
Replies: 3
Views: 151

Re: Help on HW#4.9 [ENDORSED]

Yes, since iodine is beyond the 3p orbital it can and will form an expanded octet.
by salvadoralvizo1J
Sun Jun 10, 2018 11:46 pm
Forum: Hybridization
Topic: sp^3d or dsp^3
Replies: 6
Views: 278

Re: sp^3d or dsp^3

I had the same question last week. The order doesn't matter, but I believe writing the d at the end is preferred.
by salvadoralvizo1J
Sun Jun 10, 2018 11:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Final [ENDORSED]
Replies: 5
Views: 273

Re: Final [ENDORSED]

My TA said they will be as specific a possible on those types of questions. You can probably just write bent unless otherwise specified.
by salvadoralvizo1J
Sun Jun 10, 2018 11:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent/angular [ENDORSED]
Replies: 5
Views: 187

Re: Bent/angular [ENDORSED]

Yes, it is the same thing and I had the same confusion.
by salvadoralvizo1J
Sun Jun 10, 2018 11:42 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 377

Re: Sig Figs for Final

Yes, we are expected o know significant digits since the midterm.
by salvadoralvizo1J
Sun Jun 10, 2018 11:39 pm
Forum: Polyprotic Acids & Bases
Topic: Coordination number [ENDORSED]
Replies: 3
Views: 665

Re: Coordination number [ENDORSED]

It is also basically the same as a bond number.
by salvadoralvizo1J
Sun Jun 10, 2018 11:36 pm
Forum: Air Pollution & Acid Rain
Topic: ACID RAIN
Replies: 5
Views: 401

Re: ACID RAIN

One of the ways acid rain is harmful is due to its higher acidity. Its lower pH values would greatly harm the pH levels of marine life as well as terrestrial soil, causing lots of damage.
by salvadoralvizo1J
Sun Jun 10, 2018 11:33 pm
Forum: Lewis Acids & Bases
Topic: pH
Replies: 3
Views: 251

Re: pH

Yeah, its one of the learning objectives.
by salvadoralvizo1J
Sun Jun 10, 2018 11:21 pm
Forum: Lewis Acids & Bases
Topic: Strong Acid
Replies: 8
Views: 403

Re: Strong Acid

Because it completely dissasociates in water.
by salvadoralvizo1J
Sun Jun 10, 2018 11:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7726
Views: 1045378

Re: Post All Chemistry Jokes Here

A proton walks into a bar. He's visibly depressed and disheveled. "Why the long face?" the bartender asks. The proton sighs. "I found out my wife has been unfaithful," he replies. "How do know?" asks the bartender. "Well, you see, I've always been faithful to my wi...
by salvadoralvizo1J
Wed May 30, 2018 8:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.13 D
Replies: 1
Views: 87

4.13 D

On question 4.13 D, shouldn't the middle N have one lone pair because this has the lowest formal charge? Then why do the Ns have double or triple bonds?
by salvadoralvizo1J
Sun May 27, 2018 10:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR confusion
Replies: 8
Views: 353

Re: VSEPR confusion

Lewis structure simply gives us the basics of valence electrons, ie how many pairs there are, how many single double or triple bonds, how many electrons in general. VSEPR actually tells you the angle of the shapes in a 3-D perspective. All electrons wish to be as far away from each other as possible...
by salvadoralvizo1J
Sun May 27, 2018 10:50 pm
Forum: Octet Exceptions
Topic: Expanded Octet
Replies: 2
Views: 287

Re: Expanded Octet

There is an expanded orbital due to the fact that elements on this horizontal group have access to an extra ten orbitals that are other wise used up on other groups.
by salvadoralvizo1J
Sun May 27, 2018 10:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: PF3 molecular geometry
Replies: 2
Views: 427

Re: PF3 molecular geometry

P would have one lone pair due to the fact that this has a formal charge of 0. It would also affect VSEPR shape, as it lone pairs have lower pull. Think of the example in class when he pulled the little ball and only the stick was sticking out.
by salvadoralvizo1J
Sun May 13, 2018 9:10 pm
Forum: Lewis Structures
Topic: Lewis Structure [ENDORSED]
Replies: 3
Views: 132

Re: Lewis Structure [ENDORSED]

Atoms that fall on the 3P orbital would have a higher tendency to form double and triple bonds due to the fact that these atoms are the exceptions to the octet rule, and may be able to hold up to an extra 20 electrons.
by salvadoralvizo1J
Sun May 13, 2018 6:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 40
Views: 1576

Re: Formal charge purpose

If having a formal charge of 0 means that an atom is most stable, then why do atoms like chlorine tend to have a negative charge when isolated (ie Cl-)?
by salvadoralvizo1J
Sun May 13, 2018 6:43 pm
Forum: Octet Exceptions
Topic: Concept of Exceptions
Replies: 4
Views: 206

Re: Concept of Exceptions

Elements on the third row on the p-orbital have higher energy than 3-D electrons. Since third row electrons don't have any electrons on the 3D orbital, valence electrons can fill in the empty row.
by salvadoralvizo1J
Sun May 06, 2018 3:07 pm
Forum: Einstein Equation
Topic: Question 1.25b
Replies: 2
Views: 221

Question 1.25b

What is the specific equation for finding the energy of mass for this one problem why do we have to multiply the energy of the the sodium light with the moles and avogrado"s number?
by salvadoralvizo1J
Sat May 05, 2018 11:51 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 3
Views: 134

Electron Configuration Exceptions

How many configuration exceptions are we supposed to memorize on top of Chromium and Copper? Also, is it true that all exceptions to the rule are below Cr and Cu on the periodic table?
by salvadoralvizo1J
Wed May 02, 2018 9:07 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.13
Replies: 2
Views: 111

Question 2.13

Are we expected to know orientations and descriptions of the "P sub x/y/z" orbitals beyond the fact that their lobes are oriented along their respective axes?
by salvadoralvizo1J
Sun Apr 29, 2018 8:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Why does 4s fill up before 3d?
Replies: 4
Views: 185

Re: Why does 4s fill up before 3d?

Is there any particular reason as to why orbitals are named the way they are, or where these letters chosen at random?
by salvadoralvizo1J
Sun Apr 29, 2018 8:07 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbital shell in Hydrogen
Replies: 2
Views: 99

Re: Orbital shell in Hydrogen

Since there is only one electron in a typical Hydrogen atom, it would interact with the nucleus at a constant rate.
by salvadoralvizo1J
Sun Apr 29, 2018 7:58 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman Series
Replies: 4
Views: 156

Re: Lyman Series

I believe its UV light.

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