Search found 28 matches

by Kaitlin_Ryan_ 3K
Fri Mar 17, 2017 3:55 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Conformation Determining
Replies: 2
Views: 641

Re: Conformation Determining

The only way to tell is by seeing the Newman Projection.
by Kaitlin_Ryan_ 3K
Sun Mar 12, 2017 3:29 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Naming Organic Molecules
Replies: 19
Views: 1998

Re: Naming Organic Molecules

Any tips on remembering the structures for the functional groups?
by Kaitlin_Ryan_ 3K
Mon Mar 06, 2017 3:50 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Arrows
Replies: 4
Views: 398

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.
by Kaitlin_Ryan_ 3K
Mon Mar 06, 2017 3:48 pm
Forum: *Cycloalkanes
Topic: Cyclo-
Replies: 7
Views: 884

Re: Cyclo-

When numbering carbons on a Cyclo- molecule, which carbon is numbered first?
by Kaitlin_Ryan_ 3K
Sun Feb 26, 2017 6:15 pm
Forum: *Electrophiles
Topic: AlCl3 as an electrophile
Replies: 3
Views: 377

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.
by Kaitlin_Ryan_ 3K
Sat Feb 18, 2017 12:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15320

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?
by Kaitlin_Ryan_ 3K
Sat Feb 11, 2017 11:23 am
Forum: Phase Changes & Related Calculations
Topic: Open, Closed, and Isolated Systems
Replies: 8
Views: 704

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.
by Kaitlin_Ryan_ 3K
Sat Feb 04, 2017 3:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Bond Enthalpies
Replies: 7
Views: 547

Re: Bond Enthalpies

Why do more complex molecules have higher bold enthalpies than simpler molecules?
by Kaitlin_Ryan_ 3K
Sun Jan 29, 2017 3:56 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Homework
Replies: 2
Views: 392

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
by Kaitlin_Ryan_ 3K
Fri Jan 20, 2017 6:52 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: temperature [ENDORSED]
Replies: 2
Views: 395

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.
by Kaitlin_Ryan_ 3K
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: 182

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.
by Kaitlin_Ryan_ 3K
Fri Dec 02, 2016 12:08 pm
Forum: Amphoteric Compounds
Topic: How am i able to tell if something is amphiprotic ?
Replies: 2
Views: 17382

Re: How am i able to tell if something is amphiprotic ?

Thanks this is really helpful!
by Kaitlin_Ryan_ 3K
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: 761

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.
by Kaitlin_Ryan_ 3K
Thu Nov 24, 2016 12:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3
Replies: 2
Views: 611

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.
by Kaitlin_Ryan_ 3K
Thu Nov 17, 2016 10:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp
Replies: 6
Views: 904

Re: Kp

When calculating Kp, only gases are used.

Solids and liquids are excluded from this calculation.
by Kaitlin_Ryan_ 3K
Fri Nov 11, 2016 5:19 pm
Forum: Naming
Topic: Ligand Quizlet
Replies: 2
Views: 332

Re: Ligand Quizlet

Thanks this is a lot of help!
by Kaitlin_Ryan_ 3K
Fri Nov 11, 2016 5:09 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 367

Re: Naming

For keeping track, I find memorization is the best way to go. Maybe come up with a mnemonic device
by Kaitlin_Ryan_ 3K
Tue Nov 01, 2016 1:30 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Midterm
Replies: 6
Views: 596

Re: Midterm

Will we responsible for knowing how to write out the valence electron configuration for molecules for the midterm?
by Kaitlin_Ryan_ 3K
Wed Oct 26, 2016 2:15 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Characters
Replies: 5
Views: 678

Re: Ionic Characters

How is ionic character determined?
by Kaitlin_Ryan_ 3K
Fri Oct 21, 2016 11:33 am
Forum: Empirical & Molecular Formulas
Topic: Writing Formulas
Replies: 6
Views: 761

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.
by Kaitlin_Ryan_ 3K
Fri Oct 21, 2016 11:30 am
Forum: Empirical & Molecular Formulas
Topic: Workbook Self Test Problem 4
Replies: 2
Views: 326

Re: Workbook Self Test Problem 4

That makes a lot of sense thanks!
by Kaitlin_Ryan_ 3K
Thu Oct 13, 2016 4:26 pm
Forum: Empirical & Molecular Formulas
Topic: Workbook Self Test Problem 4
Replies: 2
Views: 326

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 ...
by Kaitlin_Ryan_ 3K
Thu Oct 13, 2016 4:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Quizes
Replies: 21
Views: 1378

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.
by Kaitlin_Ryan_ 3K
Thu Oct 06, 2016 5:15 pm
Forum: Properties of Light
Topic: Homework Problem 1.55
Replies: 4
Views: 609

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?
by Kaitlin_Ryan_ 3K
Thu Oct 06, 2016 3:55 pm
Forum: Properties of Light
Topic: Atomic Spectra- Question 1.15 [ENDORSED]
Replies: 3
Views: 520

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...
by Kaitlin_Ryan_ 3K
Wed Sep 28, 2016 11:12 pm
Forum: General Science Questions
Topic: units
Replies: 2
Views: 621

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.
by Kaitlin_Ryan_ 3K
Sun Sep 25, 2016 6:00 pm
Forum: Student Social/Study Group
Topic: Chemistry Jokes
Replies: 31
Views: 4383

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 ...
by Kaitlin_Ryan_ 3K
Sun Sep 25, 2016 5:40 pm
Forum: Significant Figures
Topic: Which number to use?
Replies: 6
Views: 702

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...

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