Search found 19 matches
- Sun Mar 19, 2017 9:58 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3695852
Re: Post All Chemistry Jokes Here
why do chemists like nitrates so much? Because they are much cheaper than day rates.
- Sun Mar 12, 2017 7:04 pm
- Forum: *Alkenes
- Topic: Does order matter in Line structure? [ENDORSED]
- Replies: 4
- Views: 955
Re: Does order matter in Line structure? [ENDORSED]
i also do not think the order matters as long as it is obvious where your drawing starts and ends
- Sun Mar 05, 2017 8:51 pm
- Forum: *Alkanes
- Topic: IUPAC Naming
- Replies: 1
- Views: 588
IUPAC Naming
For the IUPAC naming, do we need to memorize all of the prefixes that depend on the number of carbons in the molecule as shown in Table 1.1 on page 5 in the Ochem book? Thanks!
- Sun Feb 26, 2017 12:26 pm
- Forum: *Electrophiles
- Topic: Bruincast Friday 2/24
- Replies: 5
- Views: 1445
Re: Bruincast Friday 2/24
I think our best bet is to wait for the other lecture to come out or contact the bruincast at bruincasthelp@ucla.edu
- Sun Feb 19, 2017 11:34 pm
- Forum: Second Order Reactions
- Topic: Is there such a thing as a Third Order Reaction?
- Replies: 5
- Views: 2525
Re: Is there such a thing as a Third Order Reaction?
I believe we will just have to know zero, first, and second order reactions but the quiz will cover only kinetics up to page 73 in the course reader if that helps!
- Fri Jan 27, 2017 9:31 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Quiz Solutions?
- Replies: 1
- Views: 404
Re: Quiz Solutions?
I do not believe there are answers for the quiz in the back of the course reader, but many of the prep quiz questions are discussed on chemistry community if that helps!
- Sun Jan 22, 2017 10:17 pm
- Forum: Phase Changes & Related Calculations
- Topic: Open, Closed, and Isolated Systems
- Replies: 8
- Views: 3208
Open, Closed, and Isolated Systems
Hi, can someone please go more in depth on the differences between each kind of system and give some examples?
- Sun Jan 15, 2017 7:27 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacities [ENDORSED]
- Replies: 3
- Views: 766
Re: Heat Capacities [ENDORSED]
Specific heat capacity is the heat required to raise the temperature of 1g by 1 degree celsius and molar heat capacity is the heat required to raise the temperature of 1 mole by 1 degree celsius. The difference is that one is measured in J/mol and the other is J/g or kJ depending on what information...
- Sat Dec 03, 2016 12:36 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3695852
Re: Post All Chemistry Jokes Here
A man and a woman are sitting at a bar. The man is wearing a shirt that says "Polar" and the woman is wearing a shirt that says "Non-Polar". The man gets up and suddenly says: "Sorry, I just don't think the chemistry is right".
- Fri Nov 25, 2016 12:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: equilibrium constant
- Replies: 3
- Views: 782
Re: equilibrium constant
I think we need to know the general way in which temperature affects equilibrium by first determining if the reaction is endothermic (heat added with reactants) or exothermic (heat added with products). If the reaction requires heat (endothermic), then heating will favor the forward direction/format...
- Fri Nov 18, 2016 12:17 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination number [ENDORSED]
- Replies: 3
- Views: 931
Re: coordination number [ENDORSED]
Coordination number is the number of bonds the central atom has inside of the complex, or brackets. Be sure to take into account ligands that can have more than on bond such a (en) or oxalato when counting up the total number of bonds.
- Thu Nov 10, 2016 8:06 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Drawing MO Diagrams
- Replies: 3
- Views: 4089
Re: Drawing MO Diagrams
The more electronegative atom is slightly lower when drawing MO diagrams for a heteronuclear diatomic molecule. Additionally, if one of the atoms has a nuclear charge of 8 and higher (Z>8) then the sigma bonds are lower than the pi bonds.
- Thu Nov 03, 2016 6:00 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration for Fe 3+
- Replies: 5
- Views: 46557
Re: Electron Configuration for Fe 3+
When I work this out, I first write out the structure for the ground state configuration which would be [Ar] 3d^6 4s^2 and then I just take electrons out in the order that is written so Fe3+ would be [Ar]3d^5 since the 4s block has slightly lower energy and they are filled first. Hope this helps!
- Thu Oct 27, 2016 8:32 pm
- Forum: Electronegativity
- Topic: Electronegativity in Quiz 2 [ENDORSED]
- Replies: 3
- Views: 832
Re: Electronegativity in Quiz 2 [ENDORSED]
You just need to remember that as the difference in electronegativity increases, the ionic character increases. This usually occurs in the top right of the periodic table with F, Cl, and O being the most electronegative.
- Sun Oct 23, 2016 9:21 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 5
- Views: 1226
Re: Central Atom
It is usually the atom will the least ionization energy.
- Thu Oct 20, 2016 10:32 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Excited vs. Ground State [ENDORSED]
- Replies: 1
- Views: 582
Excited vs. Ground State [ENDORSED]
Hi, I just need a little bit more clarification on the difference between the electron configurations of an excited atom and a ground state atom similar to the problem 2.39 on the homework in the textbook. How can you discern between the two?
- Thu Oct 13, 2016 6:57 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical equations too slow... any advice? [ENDORSED]
- Replies: 18
- Views: 4041
Re: Balancing Chemical equations too slow... any advice? [ENDORSED]
I agree that balancing out the biggest number on the reactant side first is a good first step as some of the other elements tend to fall into place after that and match up. Additionally, I like to list all the elements on the side of my work in order to keep track of the ones I have or have not bala...
- Fri Oct 07, 2016 11:23 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quizes
- Replies: 21
- Views: 3040
Re: Quizes
Hi, for the quizzes I believe we can only use a scientific, non-graphing calculator and they will be 40 minutes and completed in discussion if that answers your question. But, I do not know whether the quiz will be multiple choice or short answer.
- Wed Sep 28, 2016 10:38 pm
- Forum: Properties of Light
- Topic: Speed of radiation
- Replies: 2
- Views: 655
Re: Speed of radiation
Yes I believe so because light is also known as electromagnetic radiation and the speed of light, c, is a constant.