Search found 30 matches
- Sun Jun 10, 2018 11:52 am
- Forum: Hybridization
- Topic: Hibridization
- Replies: 3
- Views: 611
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.
- Sun Jun 10, 2018 11:12 am
- Forum: Hybridization
- Topic: sigma vs pi bonds
- Replies: 4
- Views: 824
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.
I hope this answers your question Andre.
- Sun Jun 10, 2018 10:57 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape of AX5E
- Replies: 5
- Views: 2309
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
- Sat Jun 02, 2018 1:26 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral and Square planar
- Replies: 8
- Views: 1412
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.
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.
- Sat Jun 02, 2018 1:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs. Angular
- Replies: 11
- Views: 1150
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.
- Sun May 20, 2018 9:40 am
- Forum: Resonance Structures
- Topic: How does a resonance structure work?
- Replies: 10
- Views: 1081
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.
- Sun May 20, 2018 9:36 am
- Forum: Bond Lengths & Energies
- Topic: calculating bond length
- Replies: 3
- Views: 515
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...
- Sun May 20, 2018 9:30 am
- Forum: Lewis Structures
- Topic: Exception to Lewis Structure?
- Replies: 4
- Views: 540
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?
- Sun May 20, 2018 9:19 am
- Forum: Quantum Numbers and The H-Atom
- Topic: ms quantum number
- Replies: 1
- Views: 435
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.
- Thu May 17, 2018 8:48 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formula Provided
- Replies: 6
- Views: 971
Re: Formula Provided
Just a follow-up question. What is the importance of the formal charge when it comes to drawing a Lewis structure?
- Thu May 17, 2018 7:23 pm
- Forum: Lewis Structures
- Topic: Creating a Lewis Stucture
- Replies: 8
- Views: 935
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...
- Wed May 09, 2018 9:19 pm
- Forum: Empirical & Molecular Formulas
- Topic: Question 3 on midterm [ENDORSED]
- Replies: 8
- Views: 1153
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...
- Wed May 09, 2018 5:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Significant Figures [ENDORSED]
- Replies: 4
- Views: 614
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.
- Wed May 09, 2018 5:11 pm
- Forum: Trends in The Periodic Table
- Topic: question
- Replies: 6
- Views: 768
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.
- Sun May 06, 2018 12:39 pm
- Forum: Photoelectric Effect
- Topic: Test 2 final question [ENDORSED]
- Replies: 15
- Views: 1818
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.
- Sun May 06, 2018 12:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Exceptions
- Replies: 2
- Views: 409
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.
- Tue May 01, 2018 12:58 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: PROBLEM 2.1
- Replies: 4
- Views: 451
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...
- Sun Apr 29, 2018 5:18 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: quantum numbers [ENDORSED]
- Replies: 3
- Views: 581
Re: quantum numbers [ENDORSED]
Quantum numbers basically describe the location of an electron at a point in time.
- 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: 1033
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.
- Sun Apr 29, 2018 4:55 pm
- Forum: DeBroglie Equation
- Topic: Test #2: Q5 [ENDORSED]
- Replies: 9
- Views: 1273
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.
- Sat Apr 21, 2018 1:16 pm
- Forum: Properties of Light
- Topic: test 2
- Replies: 18
- Views: 1584
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.
- 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: 423
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?
- Tue Apr 17, 2018 3:32 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: HW 1.15
- Replies: 6
- Views: 684
Re: HW 1.15
Where did you find that the final energy goes to 1? Can you explain the reasoning behind this?
- 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: 3201
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.
- Sun Apr 15, 2018 9:22 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Molecular X
- Replies: 9
- Views: 957
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...
- Sun Apr 15, 2018 8:30 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Molecular X
- Replies: 9
- Views: 957
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?
- Sun Apr 15, 2018 7:59 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Molecular X
- Replies: 9
- Views: 957
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?
- Sun Apr 15, 2018 7:13 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Bohr Frequency Condition [ENDORSED]
- Replies: 2
- Views: 405
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.
- Sun Apr 15, 2018 6:20 pm
- Forum: Properties of Light
- Topic: HW 1.3 [ENDORSED]
- Replies: 12
- Views: 1625
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.