Search found 31 matches
- Tue Nov 12, 2019 9:20 am
- Forum: Lewis Structures
- Topic: Center of a Lewis Structure
- Replies: 7
- Views: 61
Re: Center of a Lewis Structure
I figure out which atom is the least electronegative which is often the one with the lowest ionization energy. Nitrogen and Oxygen are exceptions to this though
- Tue Nov 12, 2019 9:19 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power
- Replies: 6
- Views: 50
Re: Polarizing Power
Polarizability is how easily an electron cloud is distorted by an electric field. Polarizing power is a cations ability to attract valence electrons from a nearby anion in ionic compounds
- Tue Nov 12, 2019 9:16 am
- Forum: Sigma & Pi Bonds
- Topic: Sigma & Pi Bonds
- Replies: 5
- Views: 60
Re: Sigma & Pi Bonds
Sigma bonds are formed by end to end overlapping atomic orbitals. Pi bonds are when the lobe of one atomic orbital overlaps with another.
- Tue Nov 12, 2019 9:14 am
- Forum: Dipole Moments
- Topic: 3F.11
- Replies: 3
- Views: 36
Re: 3F.11
I agree with this. hydrogen bonds form only when hydrogen bonds with nitrogen oxygen or florine so D would be the only one that forms a hydrogen bond.
- Tue Nov 12, 2019 9:12 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test #2
- Replies: 22
- Views: 286
Re: Test #2
I also am wondering. My TA said that they have not written yet so do not know...
- Sun Nov 03, 2019 11:55 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 9
- Views: 88
Re: Atomic Radius
Atomic radius increases as you move from the top right corner of the periodic table to the bottom left. As you add more electrons the radius increases until a new shell is added when you move down to the next period
- Sun Nov 03, 2019 11:50 pm
- Forum: Properties of Electrons
- Topic: Rydberg Constant
- Replies: 2
- Views: 58
Re: Rydberg Constant
The Rydberg formula is a mathematical formula used to predict the wavelength of light resulting from an electron moving between energy levels of an atom.
- Sun Nov 03, 2019 11:46 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent
- Replies: 14
- Views: 121
Re: Ionic vs Covalent
The difference between ionic and covalent bonds are the type of element involved in the reaction. Ionic bonds are between a metal and a nonmetal while covalent bonds are between two non-metals.
- Sun Nov 03, 2019 11:45 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 1156
Re: Study Tips
The online modules and assessments are so helpful for this class you can really see if you understand the material. I have found youtube videos helpful as well for more knowledge on sections I do not understand.
- Sun Nov 03, 2019 11:42 pm
- Forum: Photoelectric Effect
- Topic: Best way to study for this topic?
- Replies: 8
- Views: 148
Re: Best way to study for this topic?
The pre and post assessments on the class website are very helpful for studying as well as the module videos.
- Sun Oct 27, 2019 10:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Metals Vs. Nonmetals
- Replies: 8
- Views: 80
Re: Metals Vs. Nonmetals
Nonmetals do not form cations because their ionization energy is too high, they share electrons to form covalent bonds
- Sun Oct 27, 2019 10:10 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 1888
Re: Formal charge purpose
Formal charge indicates the gain or loss of electrons while forming covalent bonds. Used to find which is the most stable
- Sun Oct 27, 2019 10:08 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic v. Covalent
- Replies: 6
- Views: 37
Re: Ionic v. Covalent
ionic bonds are between a metal and a non-metal and covalent are between two non-metals
- Sun Oct 27, 2019 10:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: periodic table
- Replies: 10
- Views: 91
Re: periodic table
electronegativity increases as you move left to right and decreases as you move down on the periodic table
- Sun Oct 27, 2019 10:01 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 3255
Re: Test 1 [ENDORSED]
My TA said there will be material from test 1 on the midterm, but test 2 is from after the midterm to the test and then the final will be comprehensive from the first test on
- Sun Oct 20, 2019 9:19 pm
- Forum: Properties of Light
- Topic: Midterm Exam
- Replies: 21
- Views: 218
Re: Midterm Exam
Drake Choi_1I wrote:Is there going to be a curve for the midterm? Or is grade based on raw score?
No curve in the class so just your raw score from all assignments added up out of 500 I believe
- Sun Oct 20, 2019 9:17 pm
- Forum: Properties of Light
- Topic: Unit for Wavelength
- Replies: 34
- Views: 209
Re: Unit for Wavelength
since wavelength is a measure of distance it is found in meters, pm, or nm
- Sun Oct 20, 2019 9:15 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 539
Re: Best Way To Study?
When studying by doing practice problems from the textbook, how do you guys check if your answers are correct? For me many times I may think I got the correct answer when I really didn't. There is a solution manual for the textbook questions so you can check if you did the work correctly that way! ...
- Sun Oct 20, 2019 9:13 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Incorrect atomic model example
- Replies: 3
- Views: 27
Re: Incorrect atomic model example
The unrealistic answer tells us that the electrons cannot be located at the nucleus of the atom, because the value we used for the uncertainty in position for the calculation was the diameter of the hydrogen nucleus. This tells us that electrons cannot be located in the nucleus, and therefore are o...
- Sun Oct 20, 2019 9:11 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Spin up and Spin down
- Replies: 2
- Views: 24
Re: Spin up and Spin down
I am also very confused on this topic and how to tell if they are parallel or paired?
- Sun Oct 13, 2019 12:39 pm
- Forum: Photoelectric Effect
- Topic: Proportional sign
- Replies: 4
- Views: 52
Re: Proportional sign
Claire Grover 3G wrote:∝ is the sign! Basically instead of writing E = hv, you could write E ∝ v, which means that E is proportional to v (by a factor of h).
I agree with this. This shows that E and v are proportionate to each other.
- Sun Oct 13, 2019 12:38 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths
- Replies: 15
- Views: 162
Re: Bond lengths
Wendy Perez 3A wrote:I believe that Dr. Lavelle mentioned this once in his lectures. A bond length between two molecules is about 10^-10m, which is equal to 1 Angstrom.
Yes, this is correct. A bond length is always equal to 1 angstrom
- Sun Oct 13, 2019 12:34 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie Equation
- Replies: 9
- Views: 112
Re: DeBroglie Equation
Since you have to have a mass to find wavelength using DeBroglie's equation, it would be impossible for it to work for light because light has no mass.
- Sun Oct 13, 2019 12:33 pm
- Forum: Properties of Light
- Topic: Large Objects
- Replies: 7
- Views: 74
Re: Large Objects
I agree with the statements above. In De Broglie's formula, since you are dividing by mass to get wavelength, the inverse relationship would make the wavelength smaller as the object gets bigger in mass.
- Sun Oct 13, 2019 12:26 pm
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 1921
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
My TA informed us on Monday that if we have the correct answer we get full credit, but if we don't have the correct answer we can get partial credit if the work we've shown is correct but a calculation was messed up
- Thu Oct 03, 2019 5:25 pm
- Forum: Significant Figures
- Topic: sig figs in calculations
- Replies: 4
- Views: 39
Re: sig figs in calculations
You should only use sig figs in your final answer to avoid error and not have incorrect numbers in your final answer.
- Thu Oct 03, 2019 5:22 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: States of Matter
- Replies: 9
- Views: 161
Re: States of Matter
The states of matter do not matter when balancing a chemical equation
- Thu Oct 03, 2019 5:20 pm
- Forum: Empirical & Molecular Formulas
- Topic: Calculating Empirical Formula with Given Amounts of Each Element
- Replies: 7
- Views: 62
Re: Calculating Empirical Formula with Given Amounts of Each Element
Personally, I like using the 100 g method because if there is such a question that says " there is 40%C, 10%O, 20%H, and an unknown amount of a 4th element, it makes it way easier to go from there inorder to calculate the empirical formula. I agree with this, the 100 g method is the easiest be...
- Thu Oct 03, 2019 5:07 pm
- Forum: General Science Questions
- Topic: Naming compounds
- Replies: 6
- Views: 87
Re: Naming compounds
My TA said the same, the common ones that we've been using in class and such will be used but for the most part, we will be given them.
- Thu Oct 03, 2019 5:05 pm
- Forum: General Science Questions
- Topic: Naming compounds
- Replies: 6
- Views: 87
Re: Naming compounds
My TA said the same, the common ones that we've been using in class and such will be used but for the most part, we will be given them.
- Thu Oct 03, 2019 5:00 pm
- Forum: Limiting Reactant Calculations
- Topic: Homework Week 1
- Replies: 18
- Views: 245
Re: Homework Week 1
Johnathan Smith 1A wrote:Can someone clarify exactly what we are supposed to do for Homework? Are we doing five problems overall or five from each section?
For the homework, you only need to turn in five problems overall, the list of questions in the different sections is just the array of questions to choose from.