Search found 20 matches

Mon Mar 07, 2016 9:21 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Staggered vs eclipsed
Replies: 3
Views: 638

Re: Staggered vs eclipsed

How do you find out the degrees between the angles? Do you just figure this out from the structure of the molecule or is there some other trick to it?
Sun Mar 06, 2016 2:33 pm
Forum: *Alkanes
Topic: Priority of Subsituents
Replies: 3
Views: 371

Re: Priority of Subsituents

I'm confused, I thought it was all alphabetical?
Sat Feb 27, 2016 5:07 pm
Forum: *Alkanes
Topic: Naming organic molecules -- Order of attachments
Replies: 2
Views: 388

Re: Naming organic molecules -- Order of attachments

I'm pretty sure that it is purely alphabetical, and like you said you disregard certain prefixes, but I don't think the size of the structure matters, it should just be alphabetical.
Fri Feb 19, 2016 7:52 am
Forum: General Rate Laws
Topic: "a"
Replies: 2
Views: 408

Re: "a"

the "a" refers to the number in front of the molecule. for example the "2" in front of 2H2O would be the "a" while the H2O would be the "A."
Sun Feb 14, 2016 8:29 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Molecularity
Replies: 1
Views: 414

Re: Molecularity

The molecularity of a reaction is defined as the number of molecules or ions that participate in the rate determining step. Molecularity is useful to know because it helps you to deduce which reaction, if there are multiple steps or stages, has the slowest rate. This is important because the slowest...
Fri Feb 05, 2016 10:34 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs irreversible work
Replies: 2
Views: 578

Re: Reversible vs irreversible work

When work is done by the system, then reversible work is greater than the irreversible work because there will be more work in an ideal, or reversible, case. When work is done on the system, then irreversible work is greater than the reversible because there is less work in an ideal, or reversible, ...
Sun Jan 31, 2016 9:19 pm
Forum: Balancing Redox Reactions
Topic: oxidation vs reduction
Replies: 2
Views: 394

oxidation vs reduction

Can someone explain the difference of oxidation versus reduction and how it is both important and relevant in electrochemistry? As in how it affects the outcome of energy and its affect on the reaction?
Sun Jan 24, 2016 8:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Internal Energy relation to Entropy
Replies: 2
Views: 335

Re: Internal Energy relation to Entropy

Delta u is equal to zero at constant temperature, so an isothermal reaction. Do not assume that delta u is always equal to zero because that is only in certain cases as the one i just mentioned, because in other states like isometric, adiabatic, isobaric or reversible and irreversible reactions, the...
Sun Jan 17, 2016 8:53 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Entropy and Relationship to Enthalpy/Degeneracy
Replies: 1
Views: 362

Re: Entropy and Relationship to Enthalpy/Degeneracy

Enthalpy is the sum of internal energy of a system and the product of the pressure and volume of the system, any change in enthalpy is the sum of the change in the internal energy and the work that has been done. Entropy on the other hand is a measure of the disorder and randomness of a system, so a...
Sun Jan 10, 2016 4:51 pm
Forum: Phase Changes & Related Calculations
Topic: state properties
Replies: 1
Views: 402

state properties

Im kind of confused as to what makes a state property a state property, and how to qualify one as such. Is it just when a value is determined by its current state? But what are the implications behind that, such as if it is possible for the state to change and what occurs to it thereafter?
Fri Dec 04, 2015 9:29 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endo vs Exo [ENDORSED]
Replies: 5
Views: 987

Re: Endo vs Exo[ENDORSED]

I would also like to add that during an exothermic reaction the equilibrium of the reaction will shift left and during endothermic reactions the equilibrium will shift towards the right. This is in the case when you use Le Chatliers principle! Hope this helps as well!
Sat Nov 28, 2015 10:29 pm
Forum: General Science Questions
Topic: General Question about MO Diagrams
Replies: 2
Views: 1085

Re: General Question about MO Diagrams

It's always better to do the diagrams because a lot of the points and partial credit points come from the diagrams so if you didn't do it for the midterm it's good to keep it in mind for the final. The diagrams also help show your process so if you did make a mistake the grader can see where you wen...
Fri Nov 20, 2015 3:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Increasing pressure
Replies: 2
Views: 497

Re: Increasing pressure

If there is an equal amount of moles on each side and pressure is increased, there will be no effect on the equilibrium.
Thu Nov 12, 2015 10:41 pm
Forum: Naming
Topic: Metals and Ligands in Coordination Compounds
Replies: 2
Views: 402

Re: Metals and Ligands in Coordination Compounds

A rule of thumb for naming is following these steps:
1. write the ligands in alphabetical order
2. then the metal
3. and then the oxidation state
Thu Nov 05, 2015 9:58 pm
Forum: Naming
Topic: Memorization or Logic?
Replies: 2
Views: 424

Re: Memorization or Logic?

For the most part, Transition metals are very close to their names so you can just use logic, however there are some metals like silver and gold where the Latin names are quite different from the English versions that we know, so it would be better to familiarize yourself with the most commonly used...
Fri Oct 30, 2015 9:11 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Quiz 2 preparation
Replies: 1
Views: 805

Quiz 2 preparation

10. Using molecular orbital theory, briefly explain why the removal of one electron in O2 strengthens bonding, while the removal of one electron in N2 weakens bonding. I am confused on this question since both of them are losing an electron, so I don't see why it would make one stronger but the othe...
Thu Oct 22, 2015 3:31 pm
Forum: Lewis Structures
Topic: Halogens
Replies: 1
Views: 405

Re: Halogens

Bridging bonds are covalent bonds through which 3 atoms share 2 electrons. For example in a B-H-B bridge bond an electron from one of the B atoms and one from the H atom would be shared between all 3 atoms. Each of the 3 atoms would consider itself the owner of the 2 electrons in terms of filling it...
Tue Oct 13, 2015 12:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: Quiz 1 preparation 3, #4
Replies: 1
Views: 503

Quiz 1 preparation 3, #4

The problem is: Calculate the volume of 0.642 M KOH (aq) that should be used to make 1.00 L of .101 M KOH (aq).

Im just confused on how to start this problem, because it goes from a molarity to molarity, and I am not sure how to set it up, or what exactly to solve for.
Thu Oct 08, 2015 11:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper
Replies: 5
Views: 1974

Re: Chromium and Copper

I would also like to add that the same rules for these exceptions apply to the other elements in the same periods as Chromium and Copper, although it is not necessary to know it for the first quiz as far as I have been told.
Thu Oct 01, 2015 2:26 pm
Forum: Significant Figures
Topic: Exact numbers in the final answers
Replies: 4
Views: 839

Re: Exact numbers in the final answers

But do we round after every single calculation, for example if its a multistep problem, or do we only round our final answer? Doing one while the other is required is how I usually end up having a slightly off final answer.