CHEMISTRY COMMUNITY

Kaitlin_Ryan_ 3K

The only way to tell is by seeing the Newman Projection.

Kaitlin_Ryan_ 3K

Any tips on remembering the structures for the functional groups?

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

When numbering carbons on a Cyclo- molecule, which carbon is numbered first?

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

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?

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

Why do more complex molecules have higher bold enthalpies than simpler molecules?

Kaitlin_Ryan_ 3K

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

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

Most likely, one method will fit the data given better than the other methods. If not, pick the method your most comfortable using.

Kaitlin_Ryan_ 3K

Thanks this is really helpful!

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

When calculating Kp, only gases are used.

Solids and liquids are excluded from this calculation.

Kaitlin_Ryan_ 3K

Thanks this is a lot of help!

Kaitlin_Ryan_ 3K

For keeping track, I find memorization is the best way to go. Maybe come up with a mnemonic device

Kaitlin_Ryan_ 3K

Will we responsible for knowing how to write out the valence electron configuration for molecules for the midterm?

Kaitlin_Ryan_ 3K

How is ionic character determined?

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

That makes a lot of sense thanks!

Kaitlin_Ryan_ 3K

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 ...

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

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?

Kaitlin_Ryan_ 3K

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...

Kaitlin_Ryan_ 3K

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.

Kaitlin_Ryan_ 3K

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 ...

Kaitlin_Ryan_ 3K

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...

CHEMISTRY COMMUNITY

Search found 28 matches

Re: Conformation Determining

Re: Naming Organic Molecules

Re: Arrows

Re: Cyclo-

Re: AlCl3 as an electrophile

Re: Quiz 2 Winter 2017

Re: Open, Closed, and Isolated Systems

Re: Bond Enthalpies

Re: Homework

Re: temperature [ENDORSED]

Re: Choosing a Method

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

Re: Exothermic and Endothermic

Re: Quiz 3

Re: Kp

Re: Ligand Quizlet

Re: Naming

Re: Midterm

Re: Ionic Characters

Re: Writing Formulas

Re: Workbook Self Test Problem 4

Workbook Self Test Problem 4

Re: Quizes

Re: Homework Problem 1.55

Atomic Spectra- Question 1.15 [ENDORSED]

Re: units

Re: Chemistry Jokes

Re: Which number to use?