## Search found 21 matches

Sat Dec 09, 2017 6:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Assuming X is small
Replies: 2
Views: 332

### Assuming X is small

How small should x be for us to ignore it when doing weak acid base equilibrium ICE problems?
Thank you!
Sat Dec 09, 2017 6:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert gases
Replies: 4
Views: 396

### Inert gases

Adding inert gases to a reaction has no effect on the equilibrium of a reaction, correct?
Thank you!
Thu Nov 30, 2017 9:47 am
Forum: Naming
Topic: Order of Ligands
Replies: 8
Views: 533

### Re: Order of Ligands

I believe the ligands need to be listed in alphabetical order.
Thu Nov 30, 2017 9:45 am
Forum: Naming
Topic: Cobalt-cobaltate
Replies: 2
Views: 267

### Re: Cobalt-cobaltate

If the overall complex has a negative charge, then -ate is added to the stem of the metal's name.

For example)
[Ni(CN)4]2- would be tetracyanidonickelate(II) ion

Hope this helps!
Sun Nov 26, 2017 5:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Composition
Replies: 1
Views: 152

### Equilibrium Composition

When calculating the equilibrium composition of a mixture using ICE and x's, what happens when you get two positive K values after solving the quadratic formula, since that is a possibility?
Sun Nov 26, 2017 5:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Difference betwen constant and quotient?
Replies: 4
Views: 508

### Re: Difference betwen constant and quotient?

Yes the reaction quotient is different only because the reaction is not at equilibrium.
But Q and Qsub(c) and Qsub(p) are all calculated the same way as k.
Sat Nov 18, 2017 4:55 pm
Forum: Naming
Topic: Oxidation State vs. Formal Charge
Replies: 3
Views: 375

### Re: Oxidation State vs. Formal Charge

Formal charge is the electric charge of an atom in a molecule assigned on the assumption that the bonding is nonpolar covalent. So like, #valence electrons - ( #lone pairs + (#shared electrons/2)) We have used formal charge to determine, when drawing lewis structures, which structure is the most sta...
Sat Nov 18, 2017 4:49 pm
Forum: Hybridization
Topic: Energy of Hybrid Orbitals
Replies: 4
Views: 641

### Energy of Hybrid Orbitals

Just to clarify: the energy of hybridized orbitals is an average of the normal orbitals, correct?
Wed Nov 08, 2017 8:34 pm
Forum: Lewis Structures
Topic: 3.59
Replies: 1
Views: 192

### Re: 3.59

The radical goes on the chlorine atom because oxygen is more electronegative and therefore is prioritized to have an octet before chlorine.
Wed Nov 08, 2017 8:31 pm
Forum: Resonance Structures
Topic: Resonance Structures for the Midterm
Replies: 3
Views: 404

### Resonance Structures for the Midterm

On the midterm, would we have to draw all the resonance structures if they just as for a Lewis structure, and not specifically the resonance structures? Or do we just draw the most stable structure?
Thanks!
Sun Nov 05, 2017 4:46 pm
Forum: Lewis Structures
Topic: Taking into Account Shape and Structure
Replies: 2
Views: 272

### Taking into Account Shape and Structure

Just clarifying: When we're drawing Lewis Structures for this midterm, we won't have to take into account the shape and structure right?
Thank You!
Sun Nov 05, 2017 4:43 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Highly Polarizable
Replies: 4
Views: 455

### Highly Polarizable

In one of the lectures, Dr. Lavelle said that "high distorted electrons" are described as being highly polarizable and ions which cause large distortions are described as having high polarizing power. What exactly does this mean?
Thank you!
Tue Oct 24, 2017 9:41 pm
Forum: Trends in The Periodic Table
Topic: Problem 2.67 (c) and (d)
Replies: 2
Views: 217

### Problem 2.67 (c) and (d)

Which element of each of the following pairs has the higher electron affinity c) chlorine or bromine (answer: Chlorine) d) lithium or sodium (answer: Lithium) I understand that electron affinities are highest toward the right of the periodic table, but what about down and up a group? Is there a tren...
Tue Oct 24, 2017 9:34 pm
Forum: Photoelectric Effect
Topic: Work function v. Ionization Energy
Replies: 2
Views: 2017

### Re: Work function v. Ionization Energy

In the lecture, Dr. Lavelle explained that ionization energy is the energy needed to remove an electron from an atom in the gas phase, while the threshold energy (work function) is the energy required to remove an electron from a solid. Hope that helps!
Tue Oct 24, 2017 2:13 pm
Forum: Properties of Light
Topic: Problem 1.55
Replies: 4
Views: 406

### Problem 1.55

1.55) If an absorption occurs in the infrared spectrum at 3600 cm^-1, what is the frequency of the radiation that corresponds to that absorption? I understand that we need to use E = (v/c), and I understand how to the get the right answer once you convert the speed of light to meters. But I'm wonder...
Sun Oct 22, 2017 5:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Px, Py, Pz
Replies: 10
Views: 816

### Re: Px, Py, Pz

Just to clarify, we only have to include the x, y, and z for the p orbitals? Because the d orbital have nodal planes too.
Sun Oct 22, 2017 5:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: expected electron configuration of chromium [ENDORSED]
Replies: 3
Views: 430

### Re: expected electron configuration of chromium[ENDORSED]

Are copper and chromium the only elements that are like this?
Sun Oct 15, 2017 6:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer, Lyman, Paschen, and Bracket Series
Replies: 3
Views: 317

### Balmer, Lyman, Paschen, and Bracket Series

Hi! I was wondering if we need to know about Balmer, Lyman, Paschen, and the Bracket Series for the test this week.
Thank you!
Sun Oct 15, 2017 4:49 pm
Forum: Properties of Electrons
Topic: Atomic Spectra and Energy Levels
Replies: 3
Views: 327

### Atomic Spectra and Energy Levels

Hi! Can anyone explain to me what Dr. Lavelle meant by "As n -> infinity, energy -> 0" in the lecture on Friday?
Thank you!
Fri Oct 06, 2017 12:40 am
Forum: Balancing Chemical Reactions
Topic: M9 Part A
Replies: 2
Views: 257

### Re: M9 Part A

We haven't covered this topic in class yet. But from my understanding, net ionic equations are basically two charged elements that undergo a chemical reaction. So in this case, Cu has a charge of 2+ and OH has a charge of 1-, so when Cu(OH)subscript2 forms, there has to be 2 OH's to balance out the ...
Fri Oct 06, 2017 12:32 am
Forum: SI Units, Unit Conversions
Topic: What will be provided?
Replies: 1
Views: 248

### Re: What will be provided?

I believe Dr. Lavelle said that a periodic table and a list of equations/constants (that we probably won't need for this test) will be provided. We need to bring a scientific calculator and a writing utensil.