## 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: 249

### 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: 93

### 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: 77
Views: 73903

### 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: 78

### 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: 4020

### 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: 71

### 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: 111

### 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: 80

### 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: 152

### 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: 143

### 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: 8252
Views: 1444768

### 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! (:
Sun Oct 20, 2019 7:14 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: States of Matter
Replies: 9
Views: 314

### 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: 174

### 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: 327

### 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 (:
Sun Oct 20, 2019 7:05 pm
Forum: Balancing Chemical Reactions
Topic: When are atoms lost or created?
Replies: 14
Views: 536

### 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: 496

### 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: 411

### 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: 417

### 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)
Sun Oct 20, 2019 6:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 58
Views: 6396

### 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: 4023

### 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: 133
Views: 17608

### 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: 3742

### 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: 3742

### 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: 178

### 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...

Go to advanced search