Search found 28 matches
- Fri Mar 17, 2017 3:55 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Conformation Determining
- Replies: 2
- Views: 1478
Re: Conformation Determining
The only way to tell is by seeing the Newman Projection.
- Sun Mar 12, 2017 3:29 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Naming Organic Molecules
- Replies: 20
- Views: 4227
Re: Naming Organic Molecules
Any tips on remembering the structures for the functional groups?
- Mon Mar 06, 2017 3:50 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Arrows
- Replies: 4
- Views: 883
Re: Arrows
Also remember that a half-headed arrow means the transfer of only 1 electron, while a double-headed arrow means the transfer of 2 electrons.
- Mon Mar 06, 2017 3:48 pm
- Forum: *Cycloalkanes
- Topic: Cyclo-
- Replies: 7
- Views: 2307
Re: Cyclo-
When numbering carbons on a Cyclo- molecule, which carbon is numbered first?
- Sun Feb 26, 2017 6:15 pm
- Forum: *Electrophiles
- Topic: AlCl3 as an electrophile
- Replies: 3
- Views: 1012
Re: AlCl3 as an electrophile
AlCl3 is an electrophile because it wishes to gain a pair of electrons to complete the octet on the Al molecule. This can be seen by drawing the Lewis structure.
- Sat Feb 18, 2017 12:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 25664
Re: Quiz 2 Winter 2017
Will answers to the practice Quiz 2 in the back of the course reader be posted to Chemistry Community as the answers to practice Quiz 1 were?
- Sat Feb 11, 2017 11:23 am
- Forum: Phase Changes & Related Calculations
- Topic: Open, Closed, and Isolated Systems
- Replies: 8
- Views: 3230
Re: Open, Closed, and Isolated Systems
Isolated systems do not allow any transfer of heat or matter. A bomb calorimeter is considered an isolated system because it prevents any heat from the reaction inside from escaping to the surroundings, and is closed so that no matter from the surroundings can enter or leave the system.
- Sat Feb 04, 2017 3:10 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Bond Enthalpies
- Replies: 7
- Views: 1097
Re: Bond Enthalpies
Why do more complex molecules have higher bold enthalpies than simpler molecules?
- Sun Jan 29, 2017 3:56 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Homework
- Replies: 2
- Views: 846
Re: Homework
Example of open system: beaker of water open to the air
Example of closed system: refrigerator coil
Example of isolated system: coffee in a thermos
Example of closed system: refrigerator coil
Example of isolated system: coffee in a thermos
- Fri Jan 20, 2017 6:52 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: temperature [ENDORSED]
- Replies: 2
- Views: 733
Re: temperature [ENDORSED]
Usually questions will give a specific temperature (i.e. 25 degrees C), but will not give another temperature. This makes it impossible to calculate a change in temperature. All that you need to do is convert the temperature to the correct units (i.e. C to K) and plug into the equation.
- Fri Jan 13, 2017 2:39 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Choosing a Method
- Replies: 2
- Views: 375
Re: Choosing a Method
Most likely, one method will fit the data given better than the other methods. If not, pick the method your most comfortable using.
- Fri Dec 02, 2016 12:08 pm
- Forum: Amphoteric Compounds
- Topic: How am i able to tell if something is amphiprotic ?
- Replies: 2
- Views: 39204
Re: How am i able to tell if something is amphiprotic ?
Thanks this is really helpful!
- Thu Nov 24, 2016 12:46 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic and Endothermic
- Replies: 4
- Views: 1622
Re: Exothermic and Endothermic
If heat is added to an exothermic reaction, more products will be formed because heat is a "reactant" of the reverse reaction. When more product is added to a reaction, more product will be formed.
In the case of an exothermic reaction, this will cause the reaction to shift left.
In the case of an exothermic reaction, this will cause the reaction to shift left.
- Thu Nov 24, 2016 12:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3
- Replies: 2
- Views: 922
Re: Quiz 3
You could email your TA and ask them when you could go pick up your workbook. Otherwise, try to find your TA after lecture and ask them if they have your workbook then.
- Thu Nov 17, 2016 10:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp
- Replies: 6
- Views: 3521
Re: Kp
When calculating Kp, only gases are used.
Solids and liquids are excluded from this calculation.
Solids and liquids are excluded from this calculation.
- Fri Nov 11, 2016 5:19 pm
- Forum: Naming
- Topic: Ligand Quizlet
- Replies: 2
- Views: 810
Re: Ligand Quizlet
Thanks this is a lot of help!
Re: Naming
For keeping track, I find memorization is the best way to go. Maybe come up with a mnemonic device
- Tue Nov 01, 2016 1:30 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Midterm
- Replies: 6
- Views: 1266
Re: Midterm
Will we responsible for knowing how to write out the valence electron configuration for molecules for the midterm?
- Wed Oct 26, 2016 2:15 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Characters
- Replies: 5
- Views: 2540
Re: Ionic Characters
How is ionic character determined?
- Fri Oct 21, 2016 11:33 am
- Forum: Empirical & Molecular Formulas
- Topic: Writing Formulas
- Replies: 6
- Views: 1466
Re: Writing Formulas
For future quizzes I believe we will be expected to know how to name the compounds. If you need a review, there is a section in the course reader under "Review of High School Chem" that goes over some basic naming rules.
- Fri Oct 21, 2016 11:30 am
- Forum: Empirical & Molecular Formulas
- Topic: Workbook Self Test Problem 4
- Replies: 2
- Views: 634
Re: Workbook Self Test Problem 4
That makes a lot of sense thanks!
- Thu Oct 13, 2016 4:26 pm
- Forum: Empirical & Molecular Formulas
- Topic: Workbook Self Test Problem 4
- Replies: 2
- Views: 634
Workbook Self Test Problem 4
When I was working through this problem, I used 2(19.00 g/mol) for the conversion of grams of fluorine gas to moles of fluorine gas, since fluorine gas is a diatomic molecule, but ended up with the wrong answer. When I tried using 19.00 g/mol for the conversion, I came up with the right answer. Why ...
- Thu Oct 13, 2016 4:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quizes
- Replies: 21
- Views: 3048
Re: Quizes
The quizzes will be similar to the self tests. I would show some work leading to how you got to your answer in order to gain partial credit. If you just write the answer down, your TA can't give you any partial credit.
- Thu Oct 06, 2016 5:15 pm
- Forum: Properties of Light
- Topic: Homework Problem 1.55
- Replies: 4
- Views: 988
Re: Homework Problem 1.55
Why is it necessary to plug in Planck's constant for part (a) of this problem?
Where would Planck's constant be plugged in to?
Where would Planck's constant be plugged in to?
- Thu Oct 06, 2016 3:55 pm
- Forum: Properties of Light
- Topic: Atomic Spectra- Question 1.15 [ENDORSED]
- Replies: 3
- Views: 918
Atomic Spectra- Question 1.15 [ENDORSED]
When solving this problem, I ran into a problem when trying to determine which n value should be used for E(final) and which should be solved for E(initial). When I plugged in n=1 for E(final) and solved for n, I came up with a decimal energy level, which is not possible. When I plugged in n=1 for E...
- Wed Sep 28, 2016 11:12 pm
- Forum: General Science Questions
- Topic: units
- Replies: 2
- Views: 933
Re: units
In general it is fine to leave your answers in terms of liters if the problem is given in milliliters. When dealing with lab calculations though, it is most convenient to convert to milliliters if the answer results in a very small quantity of liters.
- Sun Sep 25, 2016 6:00 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Jokes
- Replies: 31
- Views: 9026
Re: Chemistry Jokes
Found a couple good jokes on Google: 1) Chemistry jokes are Sodium funny I slapped my Neon that one. 2) Do you have 11 protons because your Sodium fine. 3) I think I've lost an electron, in fact I'm positive. 4) Know any good jokes about sodium hyporbromite? NaBrO 5) Chemistry is just physics. It's ...
- Sun Sep 25, 2016 5:40 pm
- Forum: Significant Figures
- Topic: Which number to use?
- Replies: 6
- Views: 1264
Re: Which number to use?
When dealing with known constants such as the speed of light, I tend to use the number with the most number of significant figures. This allows for fewer errors due to rounding off. I would therefore use 2.998 x 10^8 when possible, unless the problem specified that the speed of light was 3.00 x 10^8...