Search found 30 matches

by Johanna Caprietta 1E
Sun Jun 10, 2018 11:52 am
Forum: Hybridization
Topic: Hibridization
Replies: 3
Views: 188

Re: Hibridization

I would say for the final we need to know how to identify how many electron bonds a molecule has and memorizing what the hybridization would be.
by Johanna Caprietta 1E
Sun Jun 10, 2018 11:12 am
Forum: Hybridization
Topic: sigma vs pi bonds
Replies: 4
Views: 229

Re: sigma vs pi bonds

If a molecule has an sp2 hybridization, the molecule has three bonds. For a molecule with an sp3 hybridization, the molecule would have four bonds. The following consititutes as 1 bond: a lone pair, a single bond, a double bond, and a triple bond.
I hope this answers your question Andre.
by Johanna Caprietta 1E
Sun Jun 10, 2018 10:57 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape of AX5E
Replies: 5
Views: 236

Re: Shape of AX5E

The shape would be a square pyramidal, with angles of about 90 degress and 180 degress. An eample of AX5E would be BrF5
by Johanna Caprietta 1E
Sat Jun 02, 2018 1:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Tetrahedral and Square planar
Replies: 8
Views: 357

Re: Tetrahedral and Square planar

From my understanding, it is considered a tetrahedral when a molecule, e.g CH4, has 4 bonds but 0 lone pairs. A square planar, XeF4, has 4 bonds and 2 lone pairs. There is a difference in the amount of lone pairs reuslting in a difference in a bond angles.
by Johanna Caprietta 1E
Sat Jun 02, 2018 1:17 pm
Forum: Naming
Topic: Chelate
Replies: 3
Views: 214

Re: Chelate

Chelate contains a ligand bonded to a central metal atom at two or more points, usually forming a ring. I was also told that if a coordination compound contains at least one non-monodenate ligand, it would be considered a chelate. I hope this make sense.
by Johanna Caprietta 1E
Sat Jun 02, 2018 1:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs. Angular
Replies: 11
Views: 312

Re: Bent vs. Angular

Im pretty sure bent and angular are interchangeable. I have a diagram that shows a molecule is bent shape when there are two bonds and 1 lone pair and angular 2 bonds and 2 lone pairs,which is the opposite of what Kimberly has but are essentially the same thing.
by Johanna Caprietta 1E
Sun May 20, 2018 9:40 am
Forum: Resonance Structures
Topic: How does a resonance structure work?
Replies: 10
Views: 278

Re: How does a resonance structure work?

To add on, resonance can have different bonds as mentioned earlier. They can have partial bonds meaning that they could be between a single and double bond or between a double and triple bond.
by Johanna Caprietta 1E
Sun May 20, 2018 9:36 am
Forum: Bond Lengths & Energies
Topic: calculating bond length
Replies: 3
Views: 132

Re: calculating bond length

To add on Lavelle mentioned in class that the values he got for bond length were looked up online. He does not expect us to know how to calculate bond length, that is why he didn't give us an equation on how to solve for this. The main thing we need to take away from this is that single bonds have a...
by Johanna Caprietta 1E
Sun May 20, 2018 9:30 am
Forum: Lewis Structures
Topic: Exception to Lewis Structure?
Replies: 4
Views: 128

Re: Exception to Lewis Structure?

I just want to make sure that I have the right idea. So when drawing a Lewis Structure you have to choose a central atom with the lowest energy but they cannot include metals and hydrogen. Is this correct to some extent?
by Johanna Caprietta 1E
Sun May 20, 2018 9:19 am
Forum: Quantum Numbers and The H-Atom
Topic: ms quantum number
Replies: 1
Views: 156

Re: ms quantum number

From my knowledge, I don't think the value of 1/2 is important. When doing these problems I think the important thing is the sign that is associated with the 1/2, so +1/2 would mean that the electrons would be positioned spin up and a value of -1/2 would have the electrons in a spin down position.
by Johanna Caprietta 1E
Thu May 17, 2018 8:48 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formula Provided
Replies: 6
Views: 236

Re: Formula Provided

Just a follow-up question. What is the importance of the formal charge when it comes to drawing a Lewis structure?
by Johanna Caprietta 1E
Thu May 17, 2018 7:23 pm
Forum: Lewis Structures
Topic: Creating a Lewis Stucture
Replies: 8
Views: 218

Re: Creating a Lewis Stucture

I remember in class Lavelle said the Hydrogen is the exception in which it does not complete an octet. So when you're looking at molecules, hydrogen should never be in the middle if the molecule has a lot of valence electrons. You would then have to look at the next lowest energy if that makes any s...
by Johanna Caprietta 1E
Wed May 09, 2018 9:19 pm
Forum: Empirical & Molecular Formulas
Topic: Question 3 on midterm [ENDORSED]
Replies: 8
Views: 431

Re: Question 3 on midterm [ENDORSED]

I just assumed that Nicotine would be made up of the elements Carbon, Hydrogen, and Nicotine. For this problem I bascially converted the mass that was given for carbon dioxide and water and solved for moles of carbon and moles of hydrogen, then converted mass of nitrogen to moles of nitrogen, then c...
by Johanna Caprietta 1E
Wed May 09, 2018 5:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Significant Figures [ENDORSED]
Replies: 4
Views: 240

Re: Midterm Significant Figures [ENDORSED]

So if we are not given any values what do we use as our sig figs, because I know there were some problems like that on the test.
by Johanna Caprietta 1E
Wed May 09, 2018 5:11 pm
Forum: Trends in The Periodic Table
Topic: question
Replies: 6
Views: 261

Re: question

For both electron affinity and electronegativity, there is an increases as you go across the periodic table and a decrease as you go down the periodic table.
by Johanna Caprietta 1E
Sun May 06, 2018 12:39 pm
Forum: Photoelectric Effect
Topic: Test 2 final question [ENDORSED]
Replies: 15
Views: 482

Re: Test 2 final question [ENDORSED]

I am still confused with this concept of one-to-one ratio. I was under the impression that this was releated to threshold.
by Johanna Caprietta 1E
Sun May 06, 2018 12:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 2
Views: 133

Re: Electron Configuration Exceptions

I think for this class Lavelle said we will only be focusing on the first fow for d so (3d). The only exceptions we have to know are Cr and Cu.
by Johanna Caprietta 1E
Tue May 01, 2018 12:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: PROBLEM 2.1
Replies: 4
Views: 130

Re: PROBLEM 2.1

Wouldn't they all be increasing? For a. as n changes from 1 to 2 there is also an increase in energy. In b. the valuve of n is obviously increasing as n changes from 1 to 2. The value of l part c. also increases because l changes from 0 in the 1s orbital to L=1 in the 2p-orbital. And lastly for d, t...
by Johanna Caprietta 1E
Sun Apr 29, 2018 5:18 pm
Forum: Quantum Numbers and The H-Atom
Topic: quantum numbers [ENDORSED]
Replies: 3
Views: 158

Re: quantum numbers [ENDORSED]

Quantum numbers basically describe the location of an electron at a point in time.
by Johanna Caprietta 1E
Sun Apr 29, 2018 5:15 pm
Forum: Quantum Numbers and The H-Atom
Topic: What do l and m represent? [ENDORSED]
Replies: 6
Views: 196

Re: What do l and m represent? [ENDORSED]

L describes the type of orbital the electron is located on or shape. So l=0 is an s-orbital, l=1 is a p-orbital,and so on. M with a subsript l describes the orientation orbital the electron os located in. M with subsript s describes the the direction of the spin state.
by Johanna Caprietta 1E
Sun Apr 29, 2018 4:55 pm
Forum: DeBroglie Equation
Topic: Test #2: Q5 [ENDORSED]
Replies: 9
Views: 461

Re: Test #2: Q5 [ENDORSED]

I was confused with this question as well. It asks for the wavelenth of a sodum ion, does the mean we have to use Avagadro's number to convert from grams to moles or can we solve for the problem by just leaving it as grams.
by Johanna Caprietta 1E
Sat Apr 21, 2018 1:16 pm
Forum: Properties of Light
Topic: test 2
Replies: 18
Views: 539

Re: test 2

From my understanding we will be given 8 questions. Some will require calculations while some questions will test our understanding of the concepts because we are only given 40 mintues. I hope this makes sense, that was the information I was given from my TA.
by Johanna Caprietta 1E
Sat Apr 21, 2018 1:12 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Finding the Energy of A Photon
Replies: 3
Views: 119

Finding the Energy of A Photon

Some of the homework problems asked to calculate the energy of a photon and I am confused on how to do that. Is there a formula needed to solve for that?
by Johanna Caprietta 1E
Tue Apr 17, 2018 3:32 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: HW 1.15
Replies: 6
Views: 214

Re: HW 1.15

Where did you find that the final energy goes to 1? Can you explain the reasoning behind this?
by Johanna Caprietta 1E
Sun Apr 15, 2018 9:31 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Which mass of oxygen should be used? [ENDORSED]
Replies: 23
Views: 906

Re: Which mass of oxygen should be used? [ENDORSED]

There are so many variations for what molar mass to use but for exams Lavelle will provide us with a periodic table so we can just use the mass that is given on the sheet.
by Johanna Caprietta 1E
Sun Apr 15, 2018 9:22 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Molecular X
Replies: 9
Views: 311

Re: Finding Molecular X

Okay I found an example of what I was referring to. The questions states "A combustion analysis was conducted on an unknown molecule. After 28.4 grams of the unknown molecule was combusted, 43.82 grams of carbon dioxide and 16.44 grams of water were produced. The molecular mass of molecule is 3...
by Johanna Caprietta 1E
Sun Apr 15, 2018 8:30 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Molecular X
Replies: 9
Views: 311

Re: Finding Molecular X

Say for example problem F.13 where 4.14 g of phosphorus is combined with chlorine to produce 27.8g of a white compund. The problem then ask to find the empirical formula. What would be the steps to solve this problem?
by Johanna Caprietta 1E
Sun Apr 15, 2018 7:59 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Molecular X
Replies: 9
Views: 311

Finding Molecular X

The past two weeks we have gone over questions about solving for both the Empirical and Molecular formula. I understand how to solve these problems when I am given the molecular compound and molar mass. How do I go about solving the problem if I am not given the molecular compound?
by Johanna Caprietta 1E
Sun Apr 15, 2018 7:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition [ENDORSED]
Replies: 2
Views: 117

Re: Bohr Frequency Condition [ENDORSED]

To add on, Bohrs model is used to represent a hydrogen atom. The model consists of a proton as the nucleus with an electron orbiting the center. The Rydberg equation is also related to this for it's purpose of calculating the minimum energy to exist on an energy level.
by Johanna Caprietta 1E
Sun Apr 15, 2018 6:20 pm
Forum: Properties of Light
Topic: HW 1.3 [ENDORSED]
Replies: 12
Views: 434

Re: HW 1.3 [ENDORSED]

To answer your question Joanna, you can look at the formula wavelength x frequency = speed of light. Because speed of light is a constant, when the wavelength increases the frequency must decrease. In doing so, the slope must decrease in order to cover all areas of the x-axis.

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