CHEMISTRY COMMUNITY

vaishali 1D

What would you call a clown in jail?

Silicon

vaishali 1D

What element derives from a Norse [censored]?

Thorium.

vaishali 1D

Organic chemistry is difficult. It causes alkynes of problems.

vaishali 1D

By looking at the first and fourth experiment, you can see that the only concentration change is C but the initial rate in both those experiments are the same, therefore concentration doesn't change the rate of the reaction and that's the definition of a zero order reaction.

vaishali 1D

just m/s

vaishali 1D

That's correct! zeroth-order reactions have rates that won't vary when the reactant concentrations change. If the concentrations of reactants change and the rate remains the same, the reaction is zero order.

vaishali 1D

What kind of dogs do chemists have?

Laboratory Retrievers

vaishali 1D

What do you call a clown who's in jail?

A silicon.

vaishali 1D

Just Gibbs and electrochemical thru (but not including) the Nernst equation taught today in class (Feb. 25)

vaishali 1D

Silver walks up to gold in a bar and says, "Au, get outta here!"

vaishali 1D

What show do cesium and iodine love to watch together?

CsI

vaishali 1D

What is the chemical formula for a banana?

BaNa2

vaishali 1D

What element is a girl's future best friend?

Carbon.

vaishali 1D

It'll depend on what information the question gives you. Based on that, you can solve by plugging in the given numbers.

vaishali 1D

when delta G is negative, free energy is being released, which is what makes it spontaneous

vaishali 1D

The best thing about learning equilibrium is that nothing changes.

vaishali 1D

The name's Bond. Ionic Bond. Taken, not shared.

vaishali 1D

If the Silver Surfer and Iron Man team up, they'd be alloys.

vaishali 1D

If you need to solve a PV=nRT equation, temperature will almost always be given. Also, R is a constant on our sheet, you just need to figure out which R works in the situation (whether or not the problem is asking in bar or atm).

vaishali 1D

Kp is for pressure, whereas Kc is for concentration. When writing out the formula for Kp, you must say the partial pressure of the compound (for example, P subscript O2). For Kc, you don't use the large P, you simply put it in brackets to indicate concentration.

vaishali 1D

They're different units of measure for pressure. It's essential that you identify the correct units in order to plug in the correct value for the R constant in PV=nRT.

vaishali 1D

I usually convert from moles to concentration or even pressure, otherwise your calculations may get messed up. I believe you can use moles, but it's a little more challenging that way.

vaishali 1D

Q: What is CH2O?

A: Seawater

vaishali 1D

It'll depend on if the reaction is endo- or exo- thermic.

If endothermic, the reaction will move to the right when heat is added.

If exothermic, the reaction will move to the left when heat is added.

vaishali 1D

If the reaction is endothermic, then the products are favored when temperature increases.

If the reaction is exothermic, then the reactants are favored when temperature increases.

The opposite is true for each of the above statements when temperature decreases.

vaishali 1D

I asked the guy next to me if he had any sodium hypobromite. He said NaBrO.

vaishali 1D

Q: What animal is made up of calcium, nickel and neon?

A: A CaNiNe

vaishali 1D

The formula is the same, but K is the ratio at equilibrium, whereas Q is the reaction quotient. The numbers you plug in decide whether you're using K or Q.

vaishali 1D

Q: Why was the mole of oxygen molecules excited when he left the singles bar?

A: He got Avogadro’s number!

vaishali 1D

Q: How can you tell the chemist in the restroom?

A: He washes his hands BEFORE he goes.

vaishali 1D

Q: Why do chemists like nitrates so much?

A: They are cheaper than day rates.

vaishali 1D

Organic chemistry is difficult.

Those who study it have alkynes of trouble.

vaishali 1D

A ligand is an ion or a molecule that donates electrons (Lewis base) that binds to the central atom and help in making coordination compounds

vaishali 1D

A photon checks into a hotel and is asked if he needs any help with his luggage.

He says, "No, I'm traveling light."

vaishali 1D

Why did the bear dissolve in water?

Because it was polar.

vaishali 1D

What's a pirate's favorite element? (your victim may assume "arrrrgon".)

Gold.

vaishali 1D

I would tell another chemistry joke, but all the good ones Argon.

vaishali 1D

Two atoms are walking down the street.
One of them shouts, "Hey! I think I lost an electron!"
The other inquires, "Are you sure?"
"Yes, I'm positive!"

vaishali 1D

Because there is resonance, you can average the two. The average of 140 and 120 is 130, therefore the bond length should be 130 rpm

vaishali 1D

The electron acceptor is usually the more electronegative and tends to be delta negative.

vaishali 1D

Why did the acid go to the gym?

To become a buffer solution!

vaishali 1D

Why did the noble gas cry?

Because all his friends argon.

vaishali 1D

Did you hear about the man who got cooled to absolute zero?

He's 0K now.

vaishali 1D

Did you hear about the industrialist who had a huge chloroform spill at his factory? His business went insolvent.

vaishali 1D

Why does a hamburger have lower energy than steak? Because it's in the ground state.

vaishali 1D

I don't trust atoms...

I heard they make up everything

vaishali 1D

Q: If a mole of moles were digging a mole of holes, what would you see?

A: A mole of molasses.

vaishali 1D

Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?

A: A ferrous wheel

vaishali 1D

A chemistry professor couldn't resist interjecting a little philosophy into a class lecture. He interrupted his discussion on balancing chemical equations, saying, "Remember, if you're not part of the solution, you're part of the precipitate!"

vaishali 1D

What do you call a tooth in a glass of water?

One molar solution

vaishali 1D

Did you hear the one about cobalt, radon, and yttrium?

It was CoRnY.

vaishali 1D

I tried writing jokes about the periodic table

...but I realized I wasn’t quite in my element.

vaishali 1D

What is "HIJKLMNO"?

H2O.

vaishali 1D

Why do chemists enjoy working with ammonia?

Because it's pretty basic stuff.

vaishali 1D

Professor Lavelle mentioned in his office hours that we will have the same formula sheet on each of the tests, so no need to memorize them!

vaishali 1D

Have you heard the one about a chemist who was reading a book about helium?

He just couldn't put it down.

vaishali 1D

FrankieClarke4B wrote:While looking at this equation: Fe2O3(s)+ 3 CO2(g) ------> 2 Fe(s) + 3 CO2(g)
it implies that 2 mol Fe ~ 1 mol Fe2O3

How does this imply that 2 mol of iron equals 1 mol of the compound?

It's a ratio. It is saying that there are two moles of iron for every one mole of the compound Fe2O3.

vaishali 1D

I am still a bit confused on significant figures and when to use a certain number of sig figs. Will the answer to a problem always have the same number of sig figs as in the question? For addition and subtraction, you want to use the least number of decimal points from the values given to you in th...

vaishali 1D

I know that Professor Lavelle mentioned that we'll learn as we go, but is there any tips for memorizing common ions and their charges? I've always had trouble with that, even in high school chemistry. Thanks!

vaishali 1D

Gillian Ward 4H wrote:How should you round the atomic weights of the elements on the periodic table when using it for calculations and how many decimal places should you go out to?

I usually use the entire atomic weight given so that my final answer is more accurate than if I were to round from the start.

vaishali 1D

Hi everyone! I hadn't taken a chemistry course since my sophomore year in high school, and after the first lecture, I was a bit lost in Chem14A's content. However, I have found that using Dr. Lavelle's website (his audio/visual modules) is quite helpful in reviewing the material that I should've ma...

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