## Search found 30 matches

Sun Jun 10, 2018 7:02 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures on the Final Exam
Replies: 5
Views: 333

### Re: Drawing Lewis Structures on the Final Exam

Bond angles do not have to be accurate for lewis structure and if I remember correctly we will not be asked to draw the shapes for VSEPR. We just need to know the names of the shapes and the bond angles
Sun Jun 10, 2018 6:42 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids/Bases
Replies: 8
Views: 635

### Re: Conjugate Acids/Bases

Can anyone explain in more detail what a conjugate base and acid are and how to determine whether a molecule is a conjugate base or acid?
Sun Jun 10, 2018 6:38 pm
Forum: Amphoteric Compounds
Topic: As2O3
Replies: 4
Views: 396

### Re: As2O3

I am also confused as to how we know to include chloride in the acids equation and sodium in the base equation.
Sun Jun 10, 2018 6:33 pm
Forum: Hybridization
Topic: pi bond and sigma bond
Replies: 3
Views: 229

### Re: pi bond and sigma bond

What do we need to know about pi and sigma bonds for the final?
Sun Jun 03, 2018 9:42 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 1136

### Re: basics of hybridization

How do we know when to apply hybridization?
Sun Jun 03, 2018 5:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: homework problem 4.17 [ENDORSED]
Replies: 4
Views: 596

### Re: homework problem 4.17[ENDORSED]

Based on the lewis structure there are 2 regions of electron density, therefore, the molecule has a linear shape with 180 degree angles.
Sun Jun 03, 2018 5:04 pm
Forum: Hybridization
Topic: List of the different shapes
Replies: 6
Views: 400

### Re: List of the different shapes

Also in discussion my TA mentioned that when they ask for the geometry of the molecule, they want you to include the lone pairs, but if they ask for the molecular structure, they want you to not include the lone pairs and just describe what would be observed. So just beware that questions could ask...
Sun May 27, 2018 11:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis and trans
Replies: 7
Views: 382

### Re: cis and trans

In lecture, the polar molecule we were using as an example was cis-dichloroethene. The cis just means that the two chlorine atoms were on the same side giving the molecule its polarity. On the other hand, there was also trans-dichloroethene where the chlorine atoms were on opposite sides and so the ...
Sun May 27, 2018 11:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angle
Replies: 9
Views: 412

### Re: Bond angle

This is called lone pair repulsion and a lone pair of electron at the central atom always tries to repel bonded pair of electrons. This causes bonds to be displaced resulting in a decrease of bond angle.
Sun May 20, 2018 10:45 pm
Forum: Dipole Moments
Topic: Meaning of a dipole
Replies: 7
Views: 341

### Re: Meaning of a dipole

A dipole is a separation of opposite electrical charges. The larger the difference in electronegativity, the greater the dipole moment.
Sun May 20, 2018 10:37 pm
Forum: Ionic & Covalent Bonds
Topic: Polarization
Replies: 7
Views: 537

### Re: Polarization

I also had a similar question and Alicia your response really cleared things up on covalent character. Thank you
Sun May 20, 2018 10:27 pm
Forum: Ionic & Covalent Bonds
Topic: ionic character
Replies: 10
Views: 477

### Re: ionic character

I am also confused as to what the term covalent character means or is referring to. Can someone please explain?
Sun May 13, 2018 9:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: cations vs anions
Replies: 4
Views: 297

### Re: cations vs anions

I agree with what the others said, but I think it is easier to think of size in terms of the definitions of cation and anion. Anions gain electrons so they will grow in size, while cations lose electrons so their size will decrease.
Sun May 13, 2018 9:12 pm
Forum: Lewis Structures
Topic: Meaning of chemical bond
Replies: 5
Views: 226

### Re: Meaning of chemical bond

From what I understand the line represents a shared electron, however, my question is how do we know whether a bond is ionic or covalent?
Sun May 13, 2018 9:07 pm
Forum: Ionic & Covalent Bonds
Topic: cation vs anion
Replies: 14
Views: 1215

### Re: cation vs anion

I remember the difference between a cation and anion by seeing that anion starts with an "a" just like the work add. So for anions you add electrons.
Sat May 05, 2018 11:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: homework 2.43 part e [ENDORSED]
Replies: 8
Views: 465

### Re: homework 2.43 part e[ENDORSED]

I see. So the f block lies in between the 6s-7s and 5d/6d rows?
Sat May 05, 2018 10:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: homework 2.43 part e [ENDORSED]
Replies: 8
Views: 465

### homework 2.43 part e[ENDORSED]

The question asks what is the ground-state electron configuration expected for each of the following elements: (e) tungsten?
The answer is: [Xe] 4f^14 5d^4 6s^2
I understand where the 5d^4 and 6s^2 came from, however, I'm still confused on how to get 4f^14. Can someone please explain?
Sat May 05, 2018 10:23 pm
Forum: Photoelectric Effect
Topic: In class problem 5/4
Replies: 3
Views: 260

### Re: In class problem 5/4

It wouldn't work to use lambda=hc/E at first because we don't know the energy of the photon. In order to use that equation we need to solve for energy using the equation: Energy of photon=(threshold/work function)+1/2 m*v^2
Sun Apr 29, 2018 7:56 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer Series
Replies: 2
Views: 170

### Re: Balmer Series

The Balmer series uses visible light.
Sun Apr 29, 2018 6:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Why does 4s fill up before 3d?
Replies: 4
Views: 294

### Re: Why does 4s fill up before 3d?

The only reason I can think of is since the 3d state is higher in energy than the 4s state, the 4s state would fill up faster because it would take less energy.
Sun Apr 29, 2018 6:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: understanding orbitals [ENDORSED]
Replies: 8
Views: 369

### Re: understanding orbitals[ENDORSED]

Electrons aren't fixed to a certain position, but are orbitals? Is an orbital just a reference to a specific region?
Sun Apr 22, 2018 9:37 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf [ENDORSED]
Replies: 4
Views: 2046

### Re: E=hv vs E=hf[ENDORSED]

It is the same formula. Just as wavelength is sometimes noted as lambda, frequency is noted as v.
Sun Apr 22, 2018 9:23 pm
Forum: Properties of Light
Topic: frequency and wavelength [ENDORSED]
Replies: 5
Views: 339

### Re: frequency and wavelength[ENDORSED]

Basically, long wavelengths have low frequencies while short wavelengths have high frequencies.
Sun Apr 22, 2018 9:21 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 4
Views: 168

### Re: Photoelectric Effect

The photoelectric effect measures the energy needed to remove electrons from different metals. In the photoelectric experiment, light sources with long wavelengths cannot eject e-, however, light sources with short wavelengths (high frequencies) can eject e-.
Sun Apr 15, 2018 8:26 pm
Forum: Einstein Equation
Topic: Planck's constant [ENDORSED]
Replies: 3
Views: 311

### Re: Planck's constant[ENDORSED]

Sun Apr 15, 2018 8:17 pm
Forum: Properties of Light
Topic: HW 1.5 [ENDORSED]
Replies: 2
Views: 153

### Re: HW 1.5[ENDORSED]

A photon is characterized by either a wavelength(lambda) or equivalently an energy(E). The energy of each photon is inversely related to the wavelength of the associated EM wave.
Sun Apr 15, 2018 7:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework 3
Replies: 3
Views: 143

### Re: Homework 3

For homework, choose from the problems listed for The Quantum World chapter 1
Sun Apr 15, 2018 7:42 pm
Forum: Photoelectric Effect
Topic: Threshold Energy [ENDORSED]
Replies: 12
Views: 651

### Re: Threshold Energy[ENDORSED]

Threshold energy is the amount of energy needed to eject an electron from a metal.
Sun Apr 15, 2018 7:31 pm
Forum: Limiting Reactant Calculations
Topic: Reagent vs. Reactant [ENDORSED]
Replies: 6
Views: 717

### Re: Reagent vs. Reactant[ENDORSED]

I agree with the others. I think reagent and reactant can be used interchangeably. A reactant participates and is consumed in a chemical reaction. A reagent is sometimes used in the place of a reactant but may not be consumed in a reaction.
Sun Apr 15, 2018 7:17 pm
Forum: SI Units, Unit Conversions
Topic: Extensive vs. Intensive Properties?
Replies: 3
Views: 765

### Re: Extensive vs. Intensive Properties?

An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. An intensive property does not depend on the system size or the amount of material in the system. Color, temperature, density and solubility are examples of int...