Search found 24 matches
- Sun Nov 03, 2019 11:59 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spin Magnetic Quantum #
- Replies: 6
- Views: 525
Re: Spin Magnetic Quantum #
Yeah the number can only be -1/2 or +1 and at the review session they mentioned that its important to include the positive/ negative sign to signify direction of spin.
- Sun Nov 03, 2019 11:55 pm
- Forum: Properties of Light
- Topic: Waves
- Replies: 4
- Views: 286
Re: Waves
Its considered when it is Larger than 10^-15 m!
- Sun Nov 03, 2019 11:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 240265
Re: Tutoring? [ENDORSED]
Scott_Anderson_3J wrote:This is a bit late, but you might want to check out Alpha Chi Sigma, the chemistry fraternity here. They offer free tutoring by appointment. Here's a link to their site: http://www.chem.ucla.edu/axe/tutoring.html
Did not know that this was a resource! Thanks so much for this tip!
- Sun Nov 03, 2019 11:48 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Calculator rounding
- Replies: 3
- Views: 252
Re: Calculator rounding
What might help is when you are keying each number into the calculator, use all of the decimal places, additionally sometimes when you hit enter and use ans key in all of the decimal places because sometimes it rounds it up.
- Sun Nov 03, 2019 11:46 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8666
Re: Rydberg equation [ENDORSED]
To what extent do we need to memorize this?
- Mon Oct 28, 2019 12:53 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 3
- Views: 239
Re: Electron Configurations
We'll probably only need to know how to write out the electronic configuration, some of my friends in biochemistry use computer models/apps to draw out the orbitals and their orientation, I don't think we'll need to do that since it hasn't really been emphasized in class.
- Mon Oct 28, 2019 12:51 am
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 6
- Views: 382
Re: Delocalization
Delocalized electrons are electrons in a molecule, ion or solid metal that are not associated with a single atom or a covalent bond. Looking online it seems that delocalization can have slightly different meanings in different fields." In organic chemistry, this refers to resonance in conjugate...
- Mon Oct 28, 2019 12:48 am
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 5
- Views: 325
Re: Ionization Energy
Ionization energy is defined as the amount of energy it takes to remove an electron. According to the periodic table, there is a trend where it increases from left to right because the atomic radius gets smaller in that direction, so electrons experience more attraction to the positive nucleus and a...
- Mon Oct 28, 2019 12:45 am
- Forum: Trends in The Periodic Table
- Topic: Central Atom
- Replies: 13
- Views: 476
Re: Central Atom
The element with the lowest ionization energy is normally used as the central atom
- Mon Oct 28, 2019 12:43 am
- Forum: Trends in The Periodic Table
- Topic: Electronegativity vs. Electron affinity
- Replies: 8
- Views: 560
Re: Electronegativity vs. Electron affinity
Electronegativity is the ability of an atom to attract electrons towards itself whereas electron affinity is the amount of energy released when an atom gains an electron.
- Sun Oct 20, 2019 7:18 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2993960
Re: Post All Chemistry Jokes Here
Question: How do you become the most cited scientist of all time?
Answer: Change your name to "et al".
'Ba dum tsssssst'
Hope everyone is having a good weekend and lets get through this course together! (:
Answer: Change your name to "et al".
'Ba dum tsssssst'
Hope everyone is having a good weekend and lets get through this course together! (:
- Sun Oct 20, 2019 7:14 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: States of Matter
- Replies: 9
- Views: 664
Re: States of Matter
The states should not really matter for dilution reactions especially for the level of chemistry that we are doing for this class. So I don't think we need to factor in the states, unless it were something like enthalpy change and switching from sublimation (from solid to gas) and we need to calcula...
- Sun Oct 20, 2019 7:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bonds
- Replies: 4
- Views: 406
Re: Bonds
It depends on the type of elements that are bonding together in the reaction. Metal and non-metal then an electron is passed on from the metal to the non-metal so that they would each have a stable octet shell, in covalent bonding it is between 2 non-metals and the electrons are shared between the t...
- Sun Oct 20, 2019 7:08 pm
- Forum: Balancing Chemical Reactions
- Topic: H 1
- Replies: 6
- Views: 578
Re: H 1
A good practice might be to write out a table on the side for both the reactants and the products, I saw my TA do this in discussion. Also try and balance out the elements that appear the least FIRST, then work your way through the other elements!
Hope that helps (:
Hope that helps (:
- Sun Oct 20, 2019 7:05 pm
- Forum: Balancing Chemical Reactions
- Topic: When are atoms lost or created?
- Replies: 14
- Views: 1723
Re: When are atoms lost or created?
According to the law of conservation, atoms cannot be created or destroyed. I guess this is what happens in nature, however I think that with nuclear reactors we can convert atoms into energy. I don't think this will be covered in 14A or in our undergrad chem... cause that seems to be out of the sco...
- Sun Oct 20, 2019 7:02 pm
- Forum: Limiting Reactant Calculations
- Topic: general questions
- Replies: 11
- Views: 966
Re: general questions
We need to find the limiting reagent after balancing the equation according to their stoichiometric ratios. Finding the limiting reagent is important because this will be the deciding factor pertaining to how much the of the reagents actually react, normally amongst the reagents one of them will be ...
- Sun Oct 20, 2019 6:56 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Unit for Avogadro's Number
- Replies: 10
- Views: 2176
Re: Unit for Avogadro's Number
Avogadro's number or constant is basically the same constant number 6.0221 X 10^23. The way you should think about it is the number of atoms, within 1 mole of that particular atoms (its referring to the number of atoms) Note that different elements would have different sizes of each individual parti...
- Sun Oct 20, 2019 6:52 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: What is Molarity?
- Replies: 11
- Views: 962
Re: What is Molarity?
Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.
That is M= Moles of solute/ solution ( in liters)
That is M= Moles of solute/ solution ( in liters)
- Sun Oct 20, 2019 6:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 29293
Re: Accessing the E-textbook [ENDORSED]
Sapling is kind of like the launchpad for the LS7 Series on Macmillian, if you purchase the bundle that includes sapling that would be the online E textbook. I bought all of the bundle from Dr Lavelle's link that he had shared for about $190 and it includes the E-book, sapling, solutions, and loose ...
- Sun Oct 06, 2019 6:50 pm
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 6589
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
I think I remember hearing that if we have the correct answer for tests, even if you did a short cut or mental calculations and skipped a few steps you will still receive credit. However, I think if you do not have the correct final answer but have shown the steps and working that display the proper...
- Sun Oct 06, 2019 6:45 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 33527
Re: All students read this sig fig post [ENDORSED]
I think something that helps with the sig fig issue is under appendix 1 in the mastering chemistry textbook, part 1C "Scientific Notation", i think reading that would help illuminate a lot of misconceptions/ preconceived notions behind how to present significant figures.
- Sun Oct 06, 2019 6:41 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical vs. Actual Yield
- Replies: 38
- Views: 13860
Re: Theoretical vs. Actual Yield
What are some reasons why the actual yield for an experimental reaction is not equal to the theoretical yield? Do we need to be prepared to explain why this happened if given a lab scenario? Also this formula is important for calculating percentage yield = ( Actual Yield/ Theoratical Yield X 100%) ...
- Sun Oct 06, 2019 6:39 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical vs. Actual Yield
- Replies: 38
- Views: 13860
Re: Theoretical vs. Actual Yield
What are some reasons why the actual yield for an experimental reaction is not equal to the theoretical yield? Do we need to be prepared to explain why this happened if given a lab scenario? The theoretical yield for an experiment would normally be greater than the actual yield for an experiment, t...
- Sun Oct 06, 2019 6:34 pm
- Forum: SI Units, Unit Conversions
- Topic: Test 1
- Replies: 5
- Views: 382
Re: Test 1
What topics will the first test be covering? If i'm not wrong the topics covered for the first test will be a review of high school topics, fundamentals of chemistry, balancing equations, knowing how to find limiting reagent, calculation mole, finding number of atoms (Avogadro's constant which is 6...