## Search found 30 matches

Sun Jun 10, 2018 8:15 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 4
Views: 298

### Strong Acids

What were the strong acids we needed to memorize?
Sun Jun 10, 2018 7:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Calculating energy change (Delta E)
Replies: 4
Views: 664

### Re: Calculating energy change (Delta E)

You would plug in the n into that equation to find the Einitial an Efinal values. Then you just find delta E by subtracting Einitial from Efinal. The negative sign doesn't always mean the energy will be negative, it just depends on the n values you're working with.
Sat Jun 09, 2018 2:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: ICl2- Shape
Replies: 2
Views: 18096

### Re: ICl2- Shape

Found this quick video the linear structure of ICl2-. Hope it helps!

Sun Jun 03, 2018 10:44 pm
Forum: Hybridization
Topic: hybridization of an atom
Replies: 2
Views: 203

### Re: hybridization of an atom

In order to figure out the hybridization of ClF3 you first have to figure out the VSEPR structure to see how many "things" are around the central atom. For ClF3 it is T-shape and has the formula AX3E2. From there you can figure out the hybridization of ClF3 by counting off the orbitals unt...
Sat Jun 02, 2018 4:40 pm
Forum: Electronegativity
Topic: Test 3. Question 7.
Replies: 6
Views: 438

### Test 3. Question 7.

Why does CaCl2 have greater ionic character than MgCl2? What determines which one has greater ionic character?
Sat Jun 02, 2018 4:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand and coordination sphere
Replies: 2
Views: 168

### Ligand and coordination sphere

I'm still kind of confused on what ligands actually are. What defines a ligand and what is their role in a compound? Also, what are we supposed to understand in terms of the coordination sphere?
Thu May 24, 2018 1:16 pm
Forum: Octet Exceptions
Topic: Confusion on exceptions to the octet rule
Replies: 2
Views: 295

### Confusion on exceptions to the octet rule

For the octet expansion exceptions I know it starts with period 3 but does it start with aluminum or does it start with phosphorus? I have conflicting notes from different UA sessions for some reason. Also, if it starts with phosphorus, do aluminum have a different exception? Thank you!
Thu May 24, 2018 1:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Prioritizing Formal Charge
Replies: 2
Views: 224

### Re: Prioritizing Formal Charge

I think it would be more important to make it so the central atom's charge is equal to zero which is generally achieved through manipulating the charges of the other atoms to equal zero anyway.
Tue May 22, 2018 9:35 pm
Forum: Dipole Moments
Topic: Topics on Test 3
Replies: 2
Views: 144

### Re: Topics on Test 3

The test covers up to chapter 3 and that material was chapter 6 so I'm pretty sure he's not going to put it on the test.
Sun May 20, 2018 7:32 pm
Forum: Lewis Structures
Topic: Different ways to write the lewis structure?
Replies: 6
Views: 384

### Re: Different ways to write the lewis structure?

I think they're both okay but the first one is more commonly seen throughout the book.
Sun May 20, 2018 2:04 pm
Forum: Bond Lengths & Energies
Topic: Pentane vs. 2-dimethylpropane
Replies: 3
Views: 1193

### Pentane vs. 2-dimethylpropane

Can someone explain why pentane has a higher boiling point over 2-dimethylpropane? I need a little clarification about how the shape of the molecule plays into this.
Thu May 17, 2018 6:29 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Homework 3.25
Replies: 2
Views: 247

### Re: Homework 3.25

How do you know if Magnesium is a cation or an anion if we're just told it's magnesium?
Sun May 13, 2018 3:26 pm
Forum: Lewis Structures
Replies: 3
Views: 219

You know a species is a radical if it has an unpaired electron so essentially going through the steps and figuring out which structures have an uneven number of electrons will allow you to see if it is a radical structure or not.
Tue May 08, 2018 10:04 pm
Forum: Trends in The Periodic Table
Topic: Ionization
Replies: 1
Views: 198

### Re: Ionization

Ionization is the energy needed to remove an electron from the atom so the farther away your electron is from the nucleus, the easier it is to remove. So it decreases as you go down the periodic table because the electrons are further away and it increases as you go across the periodic table because...
Sun May 06, 2018 10:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configuration
Replies: 2
Views: 140

### Exceptions for Electron Configuration

Can someone explain why Copper and Chromium are exceptions and how we would write the configurations properly?
Sun May 06, 2018 10:56 am
Forum: Molarity, Solutions, Dilutions
Topic: Test 1. Q7.
Replies: 1
Views: 219

### Test 1. Q7.

Determine the empirical formula for an inorganic compound that, when burned in the presence of oxygen, formed 13.17 g of CO2 and 5.39 g of H2O. What is the mass percentage of carbon and hydrogen in the sample?
Mon Apr 30, 2018 10:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron configuration
Replies: 8
Views: 323

### Re: Electron configuration

This clears up a lot! Thank you! Another quick question though for clarification. I know that paired electrons have opposite spins but why do they have opposite spins? Is it due to their charge or is it because no two electrons can have the same four quantum numbers or because of something else? I'm...
Sun Apr 29, 2018 3:41 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 7
Views: 462

### Re: Shrodinger Equation

I'm not sure if we have to directly apply the equation to solve for anything but getting a good understanding of the equation is probably a good idea.
Sun Apr 29, 2018 3:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron configuration
Replies: 8
Views: 323

### Electron configuration

Why do we add parallel spins to different orbitals if there are more than 2 orbitals in a subshell?
Sun Apr 29, 2018 3:04 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number
Replies: 3
Views: 238

### Quantum Number

Can someone explain the difference between the principle quantum number, the angular quantum number, and the magnetic quantum number? How do we use them when we write the electron configuration of elements?
Sun Apr 22, 2018 10:56 pm
Forum: DeBroglie Equation
Topic: QM Description of Atoms
Replies: 2
Views: 114

### QM Description of Atoms

Why do wave models explain why electrons have quantized energy states in atoms?
Sun Apr 22, 2018 10:45 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Memorizing spectrum
Replies: 5
Views: 302

### Memorizing spectrum

I've encountered questions that require a basic understanding of the order of the electromagnetic spectrum and how they relate to frequency and wavelength. I'm curious if you guys just straight up memorized it or if you have a thought process with figuring out the order.
Sun Apr 22, 2018 10:35 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 12
Views: 484

### Re: Photoelectric Effect

The energy of the photon has to be greater or equal to the threshold energy. In the experiment, they shined UV light on metal to get an idea if its enough energy to remove an electron from the sheet. Which led us to the equation Energy (Kinetic)+ Energy (energy to remove electron)= Energy of the pho...
Sun Apr 15, 2018 1:02 am
Forum: Photoelectric Effect
Topic: Original Photoelectric Experiment
Replies: 3
Views: 191

### Re: Original Photoelectric Experiment

From what I remember in lecture, it was an experiment where they tried to get an idea if there was enough energy from UV light to remove an electron from the sheet metal. I'm confused about the idea of free energy though.
Sun Apr 15, 2018 12:56 am
Forum: Properties of Light
Topic: Units for wavelengths [ENDORSED]
Replies: 6
Views: 344

### Re: Units for wavelengths[ENDORSED]

I'm going to assume that the problems will give us a variation of both meters and nanometers and then for the final answer for wavelength we have to convert it to nanometers if necessary.
Sun Apr 15, 2018 12:51 am
Forum: Properties of Light
Topic: Threshold Energy [ENDORSED]
Replies: 3
Views: 161

### Threshold Energy[ENDORSED]

How do we figure out what the threshold energy is? Or will it be given when needed?
Wed Apr 11, 2018 4:06 pm
Forum: Student Social/Study Group
Topic: Study Group
Replies: 10
Views: 968

### Re: Study Group

Hello!

I'm interested in joining this study group. Do you guys have a groupme or a group message? Thank you!
Fri Apr 06, 2018 10:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review Worksheet [ENDORSED]
Replies: 3
Views: 205

### Review Worksheet[ENDORSED]

Can someone explain the steps to solving this problem?

Wine is approximately 12% ethanol (CH3CH2OH) by volume. Ethanol has a molar mass of 46.06 g/mol and a density of .789 g/mL. How many moles of ethanol are present in a 750 mL bottle of wine?
Fri Apr 06, 2018 9:38 pm
Forum: Balancing Chemical Reactions
Topic: H.3
Replies: 3
Views: 251

### Re: H.3

I think this might be an exception but I'm not 100% sure. I looked it up and found that Silane is interchangeable between SiH4 and H4Si but I couldn't find an exact explanation why it can be written both ways. Interesting question, though. I didn't know it was possible. Here's the link I found. Hope...
Fri Apr 06, 2018 9:26 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical formula [ENDORSED]
Replies: 3
Views: 169

### Re: Empirical formula[ENDORSED]

I've only been taught to make educated guesses about what to multiply to get a whole number. For example, with 2.7 I focus on the .7 and try to think of multiples of 7 that end in 0 so that I'd manage to get a whole number. For 2.7, I've found the smallest number I could use to multiply is 10. For 2...