Search found 30 matches

by Marina Souliman 1K
Sun Jun 10, 2018 8:15 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 4
Views: 218

Strong Acids

What were the strong acids we needed to memorize?
by Marina Souliman 1K
Sun Jun 10, 2018 7:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Calculating energy change (Delta E)
Replies: 4
Views: 245

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.
by Marina Souliman 1K
Sat Jun 09, 2018 2:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: ICl2- Shape
Replies: 2
Views: 6909

Re: ICl2- Shape

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

https://www.youtube.com/watch?v=yn3SfHBfRzY
by Marina Souliman 1K
Sun Jun 03, 2018 10:44 pm
Forum: Hybridization
Topic: hybridization of an atom
Replies: 2
Views: 124

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...
by Marina Souliman 1K
Sat Jun 02, 2018 4:40 pm
Forum: Electronegativity
Topic: Test 3. Question 7.
Replies: 6
Views: 283

Test 3. Question 7.

Why does CaCl2 have greater ionic character than MgCl2? What determines which one has greater ionic character?
by Marina Souliman 1K
Sat Jun 02, 2018 4:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand and coordination sphere
Replies: 2
Views: 110

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?
by Marina Souliman 1K
Thu May 24, 2018 1:16 pm
Forum: Octet Exceptions
Topic: Confusion on exceptions to the octet rule
Replies: 2
Views: 199

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!
by Marina Souliman 1K
Thu May 24, 2018 1:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Prioritizing Formal Charge
Replies: 2
Views: 178

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.
by Marina Souliman 1K
Tue May 22, 2018 9:35 pm
Forum: Dipole Moments
Topic: Topics on Test 3
Replies: 2
Views: 102

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.
by Marina Souliman 1K
Sun May 20, 2018 7:32 pm
Forum: Lewis Structures
Topic: Different ways to write the lewis structure?
Replies: 6
Views: 236

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.
by Marina Souliman 1K
Sun May 20, 2018 2:04 pm
Forum: Bond Lengths & Energies
Topic: Pentane vs. 2-dimethylpropane
Replies: 3
Views: 286

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.
by Marina Souliman 1K
Thu May 17, 2018 6:29 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Homework 3.25
Replies: 2
Views: 152

Re: Homework 3.25

How do you know if Magnesium is a cation or an anion if we're just told it's magnesium?
by Marina Souliman 1K
Sun May 13, 2018 3:26 pm
Forum: Lewis Structures
Topic: Radicals [ENDORSED]
Replies: 3
Views: 126

Re: Radicals [ENDORSED]

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.
by Marina Souliman 1K
Tue May 08, 2018 10:04 pm
Forum: Trends in The Periodic Table
Topic: Ionization
Replies: 1
Views: 152

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...
by Marina Souliman 1K
Sun May 06, 2018 10:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configuration
Replies: 2
Views: 94

Exceptions for Electron Configuration

Can someone explain why Copper and Chromium are exceptions and how we would write the configurations properly?
by Marina Souliman 1K
Sun May 06, 2018 10:56 am
Forum: Molarity, Solutions, Dilutions
Topic: Test 1. Q7.
Replies: 1
Views: 182

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?
by Marina Souliman 1K
Mon Apr 30, 2018 10:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron configuration
Replies: 8
Views: 192

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...
by Marina Souliman 1K
Sun Apr 29, 2018 3:41 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 7
Views: 318

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.
by Marina Souliman 1K
Sun Apr 29, 2018 3:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron configuration
Replies: 8
Views: 192

Electron configuration

Why do we add parallel spins to different orbitals if there are more than 2 orbitals in a subshell?
by Marina Souliman 1K
Sun Apr 29, 2018 3:04 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number
Replies: 3
Views: 143

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?
by Marina Souliman 1K
Sun Apr 22, 2018 10:56 pm
Forum: DeBroglie Equation
Topic: QM Description of Atoms
Replies: 2
Views: 82

QM Description of Atoms

Why do wave models explain why electrons have quantized energy states in atoms?
by Marina Souliman 1K
Sun Apr 22, 2018 10:45 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Memorizing spectrum
Replies: 5
Views: 170

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.
by Marina Souliman 1K
Sun Apr 22, 2018 10:35 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 12
Views: 378

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...
by Marina Souliman 1K
Sun Apr 15, 2018 1:02 am
Forum: Photoelectric Effect
Topic: Original Photoelectric Experiment
Replies: 3
Views: 109

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.
by Marina Souliman 1K
Sun Apr 15, 2018 12:56 am
Forum: Properties of Light
Topic: Units for wavelengths [ENDORSED]
Replies: 6
Views: 221

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.
by Marina Souliman 1K
Sun Apr 15, 2018 12:51 am
Forum: Properties of Light
Topic: Threshold Energy [ENDORSED]
Replies: 3
Views: 115

Threshold Energy [ENDORSED]

How do we figure out what the threshold energy is? Or will it be given when needed?
by Marina Souliman 1K
Wed Apr 11, 2018 4:06 pm
Forum: Student Social/Study Group
Topic: Study Group
Replies: 10
Views: 637

Re: Study Group

Hello!

I'm interested in joining this study group. Do you guys have a groupme or a group message? Thank you!
by Marina Souliman 1K
Fri Apr 06, 2018 10:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review Worksheet [ENDORSED]
Replies: 3
Views: 155

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?
by Marina Souliman 1K
Fri Apr 06, 2018 9:38 pm
Forum: Balancing Chemical Reactions
Topic: H.3
Replies: 3
Views: 154

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...
by Marina Souliman 1K
Fri Apr 06, 2018 9:26 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical formula [ENDORSED]
Replies: 3
Views: 122

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...

Go to advanced search