## Search found 16 matches

Fri Dec 08, 2017 9:45 pm
Forum: Properties of Electrons
Topic: Velocity of Ejected electron
Replies: 4
Views: 6040

### Re: Velocity of Ejected electron

Work function is the energy needed to release an electron from a metal surface.
Thu Dec 07, 2017 5:04 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of ionic v covalent bonds
Replies: 2
Views: 188

### Re: Strength of ionic v covalent bonds

I believe the electromagnetically difference is referring to whether a compound is ionic or covalent bond. If the electronegativity difference between two atoms is greater than 2 then the compound is ionic. If the electronegativity difference between two atoms is less than 1.5 then it's a covalent b...
Fri Dec 01, 2017 12:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Equilibrium
Replies: 3
Views: 819

### Re: Calculating Equilibrium

Since the problem provides you with the value of Kc, plug that value where Br2 would have gone in the equation to solve for Br2.
Fri Dec 01, 2017 10:06 am
Forum: Lewis Structures
Topic: Lewis Structure of IO2F2 (-2) Problem 4.23 [ENDORSED]
Replies: 3
Views: 4958

### Re: Lewis Structure of IO2F2 (-2) Problem 4.23[ENDORSED]

I believe Lavelle prefers the structure in which the formal charge is equal to zero.
Thu Nov 30, 2017 10:21 pm
Forum: Lewis Acids & Bases
Topic: Lewis Structure
Replies: 3
Views: 366

### Re: Lewis Structure

If the lewis structure has a positive formal charge it's most likely going to be an acid. If the structure has a negative formal charge it is most likely going to be a base.
Fri Nov 17, 2017 6:09 pm
Forum: Hybridization
Topic: Double sigma v. pi bonds
Replies: 4
Views: 242

### Re: Double sigma v. pi bonds

When there is a sigma and a pi bond that could mean there is a double bound between one atom and another, not that they are overlapping.
Wed Nov 15, 2017 4:24 pm
Forum: Hybridization
Topic: Benzene Hybridization [ENDORSED]
Replies: 4
Views: 1047

### Re: Benzene Hybridization[ENDORSED]

A carbon to hydrogen bond make up one sigma bond and since there are a total of 6 carbon to hydrogen bonds there are 6 sigma bonds there. Now the other 6 sigma bonds come from the carbon to carbon bonds. In benzene the structure is in a form of a hexagon that alternate single and double bonds. A car...
Wed Nov 08, 2017 3:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron config of elements in 5d and 6d
Replies: 4
Views: 645

### Re: Electron config of elements in 5d and 6d

As far as Chem 14A goes we do not need to know the configurations in the F-block. I believe Lavelle said to know the s-block, p-block, and the first row of the d-block in the periodic table
Thu Nov 02, 2017 3:44 pm
Forum: Resonance Structures
Topic: Do all resonance structures need to be FC=0?
Replies: 4
Views: 809

### Re: Do all resonance structures need to be FC=0?

Resonance structures that at formal charge=0, means that it's a stable bond. Typically we want to have a bond that is the most stable, not all resonance structures will have a formal charge =0 and it doesn't mean that structure is incorrect just less stable.
Thu Nov 02, 2017 3:39 pm
Forum: Hybridization
Topic: Atomic orbitals [ENDORSED]
Replies: 3
Views: 451

### Re: Atomic orbitals[ENDORSED]

A magnetic quantum number tells us the orbital an electron is occupying. It provides us with the amount of orbitals the electron has and the sub-shells.
Thu Oct 26, 2017 3:49 pm
Forum: Trends in The Periodic Table
Topic: Transition Metals
Replies: 3
Views: 288

### Re: Transition Metals

Transition metals are elements in group D, they are all metals that form cations with different oxidation numbers
Fri Oct 20, 2017 1:04 am
Forum: Photoelectric Effect
Topic: Ionization in energy levels
Replies: 4
Views: 365

### Re: Ionization in energy levels

ionization energy is another name for the work function in the photoelectric effect
Thu Oct 19, 2017 3:09 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Units
Replies: 5
Views: 418

### Re: Wavelength Units

The problem itself will usually tell you whether it wants the final answer in nanometers or in meters. Make sure to double check it before coming up with the final answer.
Thu Oct 19, 2017 3:05 pm
Forum: Properties of Electrons
Topic: h variable
Replies: 2
Views: 473

### Re: h variable

Plank's constant is represented by the letter h. Frequency on the other hand is represented by a (v) like letter. Plank's constant (h) has a value of 6.626*10^-34 J*s. As opposed to frequency that does NOT have a constant value. For some problems you might be asked to find the value for frequency.
Thu Oct 12, 2017 3:38 pm
Forum: Properties of Light
Topic: Wavelengths and Frequency of Electromagnetic Radiation [ENDORSED]
Replies: 7
Views: 650

### Re: Wavelengths and Frequency of Electromagnetic Radiation[ENDORSED]

I don't believe he would ask about what color our answer falls in the spectrum because I think he just cares about our calculations and the answer. You can also try asking Lavelle personally since this seems like a question only he could answer.
Wed Oct 11, 2017 8:00 pm
Forum: Properties of Light
Topic: Planck Constant [ENDORSED]
Replies: 8
Views: 740

### Re: Planck Constant[ENDORSED]

From I remember Lavelle said that during tests we will be provided with constants so I wouldn't worry to much about whether we should round or use 4 sig figs.