Search found 30 matches

by Sonia Aronson 1B
Thu Jun 14, 2018 12:27 am
Forum: Trends in The Periodic Table
Topic: Ionization energy vs. Ionic Character
Replies: 1
Views: 183

Ionization energy vs. Ionic Character

What is the difference between ionzation energy and ionic character? (Ionic character was on the last test and I just don't know how it's different from ionization energy)
by Sonia Aronson 1B
Wed Jun 13, 2018 8:37 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity: C vs. N
Replies: 1
Views: 122

Re: Electron affinity: C vs. N

There's an exception for N and C affinity because of Carbon's half filled subshell being more stable than Nitrogen's full subshell. So C has higher affinity than N. I think Dr. Lavelle said we shouldn't worry about that and to focus on the main trend, which is that electron affinity increases across...
by Sonia Aronson 1B
Wed Jun 13, 2018 8:24 pm
Forum: Naming
Topic: Coordination Compounds
Replies: 3
Views: 217

Re: Coordination Compounds

Can someone post an example problem of a coordination compound and go through it? I get the concept but not how to write the answer if that makes any sense
by Sonia Aronson 1B
Tue Jun 05, 2018 10:45 pm
Forum: Hybridization
Topic: strength of sigma and pi bonds
Replies: 10
Views: 392

Re: strength of sigma and pi bonds

I think a double bond is stronger than a single bond because the two p orbitals overlap and pull the atoms closer together.
by Sonia Aronson 1B
Tue Jun 05, 2018 10:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes On the Final
Replies: 3
Views: 128

Re: Molecular Shapes On the Final

I have this question too! Also, will we need to be able to name different molecules?
by Sonia Aronson 1B
Sun May 27, 2018 11:28 pm
Forum: Lewis Structures
Topic: Lone pair arrangement
Replies: 4
Views: 181

Re: Lone pair arrangement

I wouldn't worry too much about specific placement, I think figuring out which atom the lone pair is supposed to go on in the first place is the part they'll be grading.
by Sonia Aronson 1B
Sun May 27, 2018 11:25 pm
Forum: Bond Lengths & Energies
Topic: Bond Strength
Replies: 5
Views: 288

Re: Bond Strength

Two bonds are stronger than one because the molecules are doubly bound to each other by sharing more than one electron.
by Sonia Aronson 1B
Sun May 27, 2018 11:22 pm
Forum: Ionic & Covalent Bonds
Topic: Most covalent or ionic character
Replies: 3
Views: 367

Re: Most covalent or ionic character

A molecule that is ionic is going to be least covalent; the two are opposites of each other because requires two molecules to share electrons and the other steals electrons. A smaller difference in electronegativity makes a bond more covalent and a large difference in electronegativity makes a bond ...
by Sonia Aronson 1B
Mon May 21, 2018 11:15 pm
Forum: Resonance Structures
Topic: Double bonds
Replies: 3
Views: 192

Re: Double bonds

I think double bonds usually end up going on the central atom, but it's not a rule because it can change.
I was also wondering how we know when to use a double bond?
by Sonia Aronson 1B
Mon May 21, 2018 11:14 pm
Forum: Ionic & Covalent Bonds
Topic: Formal charge?
Replies: 12
Views: 466

Re: Formal charge?

The equation for finding formal charge is:
Formal Charge= [# of valence electrons on atom]- [lone pair electrons + # of bonds]
by Sonia Aronson 1B
Mon May 21, 2018 11:10 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 13
Views: 638

Re: Radicals

A radical is a molecule or atom with an unpaired electron that makes the molecule or atom highly reactive. We use radicals often in cases of resonance because they can stabilize atoms who share the electron.
by Sonia Aronson 1B
Mon May 21, 2018 10:26 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen bonds vs. dipole-dipole bonds
Replies: 2
Views: 99

Re: Hydrogen bonds vs. dipole-dipole bonds

Hydrogen bonding is a type of dipole-dipole bonding. It is the strongest type of non-ionic and non-covalent bond. Dipole-dipole bonds are between any polar molecules and their strength increases as they gain more electrons. Ion-dipole bonds are stronger than both hydrogen bonds and dipole-dipole bon...
by Sonia Aronson 1B
Mon May 14, 2018 11:39 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 5
Views: 204

Re: Electronegativity

It kinda just depends on the type of molecules
by Sonia Aronson 1B
Wed May 09, 2018 9:17 am
Forum: Balancing Chemical Reactions
Topic: balancing chemical reactions
Replies: 7
Views: 349

Re: balancing chemical reactions

Some textbooks say an easy way is to start balancing with the element that is present in the least number of equations and to balance products/reactants that are just one element last
by Sonia Aronson 1B
Wed May 09, 2018 9:13 am
Forum: Ionic & Covalent Bonds
Topic: Periodic Trends
Replies: 3
Views: 142

Periodic Trends

How are the trends different in the periodic table between ionic radii and covalent radii?
by Sonia Aronson 1B
Wed May 09, 2018 12:57 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity Exceptions
Replies: 3
Views: 221

Re: Electron Affinity Exceptions

The practice midterm has several questions about atomic radius and electron affinity so I would definitely review them!
by Sonia Aronson 1B
Wed May 09, 2018 12:54 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: E=R(1/n-1/n)?
Replies: 7
Views: 336

Re: E=R(1/n-1/n)?

Are we supposed to use E= R(1/n-1/n) or E= hR/n^2 when finding the difference in energy levels?
by Sonia Aronson 1B
Tue May 08, 2018 9:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Order of Orbitals
Replies: 3
Views: 169

Order of Orbitals

What is the order of the orbitals for an element like Cu or Ba that is has a large atomic number? (by order I mean like 2s, 2p, 3d... and any exceptions)
by Sonia Aronson 1B
Sun Apr 29, 2018 11:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Radius
Replies: 3
Views: 105

Re: Radius

When the electron is at a higher energy level, it is further from the nucleus, so it's radius has changed. Because of this, if an electron's energy changes it is likely the radius will change as well.
by Sonia Aronson 1B
Sun Apr 29, 2018 11:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: The concept of Orbitals
Replies: 12
Views: 306

Re: The concept of Orbitals

An orbital corresponds to the wavefunction of each atom, which is measured by a mathematical equation. The schrodinger equation calculates wavefunction and the corresponding energy, which is what ties orbitals to different energy levels.
by Sonia Aronson 1B
Tue Apr 24, 2018 1:49 am
Forum: Properties of Light
Topic: Diffraction Patterns
Replies: 3
Views: 241

Diffraction Patterns

One of the post-module questions is: 19. What causes a diffraction pattern? A. Slit in the barrier works as a filter to create a diffraction pattern. B. Different wavelengths which the light composes. C. Different intensities of a light wave D. Two or more waves interacting constructively and destru...
by Sonia Aronson 1B
Sun Apr 22, 2018 10:55 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative signs
Replies: 3
Views: 143

Re: Negative signs

I'm confused about this too...
I know the Rydberg equation is used to figure out the wavelength of a line in the hydrogen spectrum. The value isn't usually going to be negative because a bigger number is always subtracting a smaller number (1/2-1/4 for example).
by Sonia Aronson 1B
Sun Apr 22, 2018 10:48 pm
Forum: Photoelectric Effect
Topic: Application of different formulas [ENDORSED]
Replies: 4
Views: 144

Application of different formulas [ENDORSED]

Can someone post a list with all of the formulas and what we use each one for? For example, we use E=hv to calculate the energy of a photon.
by Sonia Aronson 1B
Fri Apr 20, 2018 1:11 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Equation & Test 2
Replies: 4
Views: 202

Re: Heisenberg Equation & Test 2

Don't think so- Test 2 only covers until 1.5, which includes calculating wavelength and frequency, identifying lines in the hydrogen spectrum, planck's constant and calculating the energy of a photon, and calculating wavelength with the de Broglie equation. It does not include the Heisenberg equatio...
by Sonia Aronson 1B
Sun Apr 15, 2018 11:31 pm
Forum: Einstein Equation
Topic: Different equations
Replies: 4
Views: 206

Re: Different equations

I'm struggling with the same thing haha. What I do is always try to determine what the question is asking for and what is given. Then you can determine which equation(s) you can use to find your answer. Right now the most important equations are: Kinetic Energy: 1/2mv^2 (or Ek)= hv-work function Pla...
by Sonia Aronson 1B
Sun Apr 15, 2018 11:21 pm
Forum: Photoelectric Effect
Topic: Threshold Energy [ENDORSED]
Replies: 12
Views: 380

Re: Threshold Energy [ENDORSED]

The threshold energy is the minimum amount of energy required to move an electron from the surface of a metal.
by Sonia Aronson 1B
Sun Apr 15, 2018 10:11 pm
Forum: Photoelectric Effect
Topic: Example 1.5 [ENDORSED]
Replies: 8
Views: 278

Example 1.5 [ENDORSED]

(a) of this example asks you to find the kinetic energy of the ejected electron. The problem gives you the speed of an electrom emitted from the surface of potassium by a photon as 668 km/s. Using the equation E=mv^2, how do you know that m is 9.109 x 10^-31kg? Do you use the molar mass of potassium...
by Sonia Aronson 1B
Sun Apr 15, 2018 8:14 pm
Forum: Photoelectric Effect
Topic: Intensity
Replies: 1
Views: 87

Intensity

I was wondering if someone could explain how to 1. find the intensity of radiation and 2. explain in what situations you would need to find the intensity
by Sonia Aronson 1B
Mon Apr 09, 2018 6:47 pm
Forum: SI Units, Unit Conversions
Topic: Avagrado's Number [ENDORSED]
Replies: 6
Views: 337

Re: Avagrado's Number [ENDORSED]

6.022x10^23 represents the number of objects per mole. It can be used to calculate the number of atoms or molecules in a given number of moles. So atoms and molecules are used interchangeably for Avogadro's Number.
by Sonia Aronson 1B
Mon Apr 09, 2018 6:41 pm
Forum: SI Units, Unit Conversions
Topic: Sig figures
Replies: 9
Views: 324

Re: Sig figures

How do you know how many decimals to use? For example, if I had 2.0 moles x 134.6 g, how many decimals should my answer have?

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