CHEMISTRY COMMUNITY

Veronica Rasmusen 2B

What is the name of the molecule CH2O?
Seawater

Veronica Rasmusen 2B

What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A ferrous wheel

Veronica Rasmusen 2B

For differential rate law, you would graph rate vs. concentration, and since rate only depends on k and not concentration, it would be a horizontal line that drops straight down when the reactants are consumed. For integrated rate law, you graph concentration vs. time for zero order reactions, the y...

Veronica Rasmusen 2B

Why do white bears dissolve in water?
Because they're polar.

Veronica Rasmusen 2B

A small furry animal walks into a bar and orders a drink.
The bartender says, "Sorry, our maximum occupancy is 6.02 x 10^23. We can't a serve a mole."

Veronica Rasmusen 2B

How many moles are in guacamole?
Avocado's number

Veronica Rasmusen 2B

You would use differential rate law if you need to find the rate given certain concentrations.
Integrated rate law is used for finding concentrations given a certain time, or finding a final concentration from an initial concentration.

Veronica Rasmusen 2B

There aren't really any cases log will be more convenient than ln, so just stick with natural log as it will always be more simple.

Veronica Rasmusen 2B

For the most part, you should not use the balanced reaction and stoichiometric coefficients to find the order of a reaction. The order of the reaction will most likely be given in a question, or you will be given experimental data or a graph which you can use as well.

Veronica Rasmusen 2B

If you are graphing rate vs. time the slope will be zero, however if you are graphing [A] vs. time there will be a slope = -k

Veronica Rasmusen 2B

We always want positive rates. Since [R] is decreasing it will be negative, and a negative sign will need to be added to counteract that.

Veronica Rasmusen 2B

Q and K are usually associated with equilibrium therefore the concepts regarding K>1 (products are favored) or Q>K (reactants are favored) or Q<K (products favored) are also constant

Veronica Rasmusen 2B

If there is no solid metal to act as a conductor, you use platinum

Veronica Rasmusen 2B

It would make most sense the multiply by the least common multiple so you won't have to do additional simplification at the end, however theoretically you could multiply by any multiple as long as the electrons cancel out

Veronica Rasmusen 2B

Since Gibbs free energy is a state function it can be added

Veronica Rasmusen 2B

Whether the reaction occurs in acidic or basic conditions will most likely be given

Veronica Rasmusen 2B

An oxidation reaction would have the electrons added on the right side of the arrow (electrons are lost) and a reduction reaction would have electrons on the left side (electrons are gained)

Veronica Rasmusen 2B

Look at the equation delta G = delta H - T(delta S) If a reaction is endothermic then delta H will be positive. It depends whether delta S is negative or positive, and whether T is a high or low value to determine whether delta G will be negative (which would mean the reaction is favorable). If Delt...

Veronica Rasmusen 2B

delta G^o is delta G at standard conditions and delta G without the ^o is just the change in Gibb's free energy under any conditions

Veronica Rasmusen 2B

What equation should you use for when solving for the change in entropy with changing temperature? I thought the correct equation is deltaS = nC(ln(T2/T1)), however in the solutions manual the equation deltaS = nR(ln(T2/T1)) is used for question 9.13 Are these two equations interchangeable or should...

Veronica Rasmusen 2B

Anytime deltaG is negative the reaction will be spontaneous and therefore favorable. If deltaS is positive the reaction is also usually favorable, unless deltaH is greater than deltaS times T (which can occur at low temperatures).

Veronica Rasmusen 2B

He just wanted to make sure that we knew that the equation we most commonly use is not the actual Van't Hoff equation but a version of it more applicable to questions that we would be asked.

Veronica Rasmusen 2B

When deltaG is negative it means the reaction is spontaneous, so it occurs easily and without work

Veronica Rasmusen 2B

A closed system can exchange energy but not matter, and an isolated system can exchange neither.

Veronica Rasmusen 2B

It depends what units your constants are in. If the heat capacity given uses moles, then you would have to convert grams to moles so the units cancel. If given specific heat capacity using grams you would not need to convert grams to moles.

Veronica Rasmusen 2B

It would be a good idea to know the difference between irreversible and reversible reactions, but if it shows up on the test it will only be a conceptual question.

Veronica Rasmusen 2B

Cv(vap) is 2.01 (J/C*g) for H2O, it is not something you calculate but will be given, or you can look it up.

Veronica Rasmusen 2B

In this case, J/g*C is the same as J/g*K

Veronica Rasmusen 2B

The delta H of 358.8 tells us the heat absorbed per mole of every substance in the reaction, this would mean there is 358.8 Kj/4 mol CS2, 358.8 KJ/4 mol C, and 358.8 KJ/ 1 mol S8. Therefore to find the heat absorbed by 1.25 mol of S8 we would multiply (358.8 KJ/ 1 mol S8) times (1.25 mol S8)

Veronica Rasmusen 2B

Since the reactor will gain heat from the heat released by the reaction it will need to be cooled down

Veronica Rasmusen 2B

yes, as it is in our lecture notes and in our homework

Veronica Rasmusen 2B

The C stands for combustion, so delta H with subscript C means the enthalpy change of combustion

Veronica Rasmusen 2B

Pi bonds are formed by leftover p orbitals, so for example if an atom of carbon was double bonded to another atom of carbon (with each carbon single-bonded to another atom), the sigma bond would be sp3 hybridized and the pi bond would be 2p hybridized.

Veronica Rasmusen 2B

Monodentate refers to a ligand that bonds to the central transition metal at one point. A bidentate is a ligand that can bond at two points to the transition metal. So basically you would look for how many atoms in the ligand are electron donors and could make bonds to the central TM.

Veronica Rasmusen 2B

All single bonds would be labeled as sigma bonds, double bonds would have one sigma bond and one pi bond, and triple bonds would have one sigma bond and two pi bonds.

Veronica Rasmusen 2B

For molar mass try to use as many decimal places as possible to be the most accurate. The number of sig figs in your final answer will still be the same as the initial amount of sig figs in the mass given (or whatever value given that has the least amount of sig figs)

Veronica Rasmusen 2B

A chelate is a complex containing a ligand that forms a ring of atoms that includes the central metal ion. Chelating ligands can bind cations tightly, so they can be used to remove metals from solutions.

Veronica Rasmusen 2B

It's biological significance is that it is found in vitamin B12.

Veronica Rasmusen 2B

Sophia Bozone 3 3B wrote:
Veronica Rasmusen 1E wrote:Most often, yes. With an odd number of electrons, there will be one electron ending up without a pair.

Thank you of this illuminating knowledge benevolent sir :-*

Why welcome fair kind maiden, hath 14a been treating thee kindly?

Veronica Rasmusen 2B

It depends on what the question is asking, if the questions wants the most stable structure or the one with the least formal charge then yes you will have to calculate the formal charges on each atom and find the most correct structure. For more basic molecules this will often by the first one you d...

Veronica Rasmusen 2B

Most often, yes. With an odd number of electrons, there will be one electron ending up without a pair.

Veronica Rasmusen 2B

There are many cases where you will draw the most stable lewis structure right off the bat, but it's always a good idea to check formal charge in case just so you don't end up losing points.

Veronica Rasmusen 2B

In most cases the best lewis structure will be the one with a central atom of the lowest ionization energy and formal charges of zero on each atom.

Veronica Rasmusen 2B

Two scientists walk into a bar The first one says “I’ll have some H2O.” The second one says, “I’ll have some H2O too.” Then he dies.

Veronica Rasmusen 2B

Did you hear about the guy who's temperature got down to absolute zero?
Don't worry, he's 0k.

Veronica Rasmusen 2B

I don't trust atoms... they make up everything

Veronica Rasmusen 2B

I try to tell chemistry jokes,
but there is no reaction :(

Veronica Rasmusen 2B

Can someone explain why the extent of the change in the electrical field at a given point decreases when the frequency of electromagnetic radiation decreases?

Veronica Rasmusen 2B

Question: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. I was able to find the frequency (v) using the wavelength but I'...

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