Can you name the variable, constant, or abbreviation represented in each of these 26 physics and chemistry equations? by sproutcm

Equation	What the Letter Represents	Letter
v = v_o + a t		a
▽• B = 0		B
E = mc²		c
d = m/V		d
▽• E = ρ/ε_o		E
ε = ε_standard - (RT/nF)ln Q		F
F = G m₁m₂/r²		G
∆H = ∆H₁ + ∆H₂ + ……		H
V = IR		I
1 J = 1 N m		J
k = A e^{( –E_a/RT)}		k
A = ε l c		l
F = ma		m

Equation	What the Letter Represents	Letter
[P + a(n/V)²](V-nb) = nRT		n
¹⁴N + ⁴He ➔ ¹⁷O + ¹H		O
p = mv		p
q = m C_PΔT		q
PV = nRT		R
ΔG = ΔH - T ΔS		S
ln (K₂/K₁) = ∆H_rxn/R (1/T₁-1/T₂)		T
dU = TdS - PdV		U
P = IV		V
W = F d cos Θ		W
P_{solvent in solution} = x_solvent P_solvent		x
Y = G + jB		Y
E = -R_HZ² (1/n_i²-1/n_i²)		Z

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There are 42 comments for this game.
(Warning: comments may contain spoilers)

Science Letters A to Z Quiz

by sproutcm

Created Apr 11, 2011 in Science
Game Plays 9,551

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	giveupyet:	Apr 12th, 2011 at 04:25 GMT		7 points
	I don't know what the rules are about publishing your own quiz, but this quiz is all kinds of awesome!

	giveupyet:	Apr 12th, 2011 at 04:28 GMT		6 points
	Or maybe I'm a huge nerd. Or both.

	sproutcm:	Apr 12th, 2011 at 04:32 GMT		4 points
	Thanks @giveupyet. I had been working on this for weeks, and finally figured out how to clue, J,O,and Y (thus the URL for the puzzle). I'm a science professor so I thought it would be cool.

	MorningBell411:	Apr 12th, 2011 at 23:36 GMT		4 points
	I really liked the quiz, but can you please accept "molar fraction" and "linear momentum"/"quantity of motion"?

Comment below threshold: show it

	rockgolf:	Apr 13th, 2011 at 01:22 GMT		13 points
	@yanks1020: I think you greatly overestimate the power of Editors. We get to choose the Editor's picks on the User Created pages, but we have no control at all over what gets to the front page. Those choices are determined by the developers and creators of Sporcle themselves. And just to be clear, editors don't get lots of front page quizzes because we're editors, rather we're asked to become editors based on our contributions of quizzes that made the front page. Cart before horse.

	Kicking222:	Apr 13th, 2011 at 17:20 GMT		7 points
	I mean, yanks1020 IS correct- every single quiz on the front page is by an Editor. For example, this person, who has never been an Editor, yet has had three front-page quizzes in the last four days? http://www.sporcle.com/user/triviahappy/games Figment of your imagination.

	Cryptus:	Apr 15th, 2011 at 08:51 GMT		3 points
	Oh dear, it doesn't bode well for taking A-Level physics exams in a couple of months when you can't remember that p in p=mv is momentum, not pressure...

	WyvernSabres:	Apr 15th, 2011 at 11:03 GMT		2 points
	I knew most of the Physics and little of the Chemistry: managed to guess my way to the 60th %ile with that! It's a good quiz, and it would be ridiculous if sproutcm were somehow morally obliged NOT to give an Editor Pick to any of his own science quizzes, especially when they're getting globe-ratings like this one.

	Xerxes314:	Apr 15th, 2011 at 18:47 GMT		2 points
	Cool idea. I second "molar fraction" as an option for "x". "n" might also accept "number". "Z" might also accept "charge" or "nuclear charge". "d" is never density; rho is volume density, sigma is area density, lambda is linear density. A cool "d" might be "dipole moment".

	richarizard:	Apr 15th, 2011 at 19:24 GMT		3 points
	I was definitely surprised by how high the averages are in this game! I loved it, and I confess I have no clue what "admittance" is.

	sproutcm:	Apr 15th, 2011 at 20:24 GMT		2 points
	@richarizard Admittance is the inverse of impedence (Z) but really it is the only thing represented by the letter Y I could find in chemistry/physics.

	WyvernSabres:	Apr 15th, 2011 at 20:42 GMT		3 points
	... apart from Yttrium, obviously (well, you have used one element as an answer, after all) ;-D

	sproutcm:	Apr 15th, 2011 at 21:10 GMT		5 points
	@WyvernSabres Yeah, as a variable Admittance was the only choice. However, o/O never gets used as a variable because it looks too much like a Zero, so I was forced to use an element symbol there, but I didn't want two of those on the quiz. Oh well.

	TimeAndTide:	Apr 16th, 2011 at 02:36 GMT		4 points
	Good idea for a quiz. A few comments: (1) The only unit abbreviation you use is J for Joule. You could change that to current density and use the Ampere-Maxwell equation: ∇∙B =μ_0 J + μ_0 ε_0 ∂E/∂t. (2) If you do that, you'd probably want to change I, perhaps to moment of inertia: N = I α. (3) If you're looking for an alternative to admittance for Y, you could do Young's modulus (although that's usually denoted by E) or even spherical harmonic: Ψ_{nlm} = R_{nl}(r) Y_{lm}(θ,ϕ) . (4) If you're using a dot to denote a vector dot product (as in your equations for B and E), then your equation for W is not right. It can either be W = F∙d (if F and d are vectors) or W = F d cos θ (if F and d are the magnitudes of force and displacement vectors and θ is the angle between them). (5) As you may have guessed by now, I'm a science professor too (physics professor, to be precise). I knew there was a reason I liked you, sproutcm! Up 'til now, I thought it was just your excellent quizzes. :-) [Note: I don't know how to do subscripts in comments, so I denote them by an underscore.]

	jdhartnagle:	Apr 16th, 2011 at 15:34 GMT		3 points
	you could have put J as the polar moment of inetria in theta=TL/GJ if you felt like getting into engineering

	cryptopian:	Apr 17th, 2011 at 17:59 GMT		2 points
	For O, you could possibly use big O notation (sinx = x + x^3/3! + O(x^5) ). It's not a variable though so possibly not.

	cryptopian:	Apr 17th, 2011 at 18:56 GMT		2 points
	And yes, I've just realised that my comment has slightly the wrong expansion in it. Fail.

	Oren:	Apr 17th, 2011 at 23:45 GMT		-2 points
	H could be anything.

	atakdog:	Apr 24th, 2011 at 23:13 GMT		1 point
	Perhaps accept Boltzmann constant for ideal gas constant? They're equivalent, and I seem to remember learning it that way though as I look at it now I can't imagine why.

	saf50:	Apr 27th, 2011 at 14:39 GMT		3 points
	@atakdog, there is a factor of Avogadro's number between them... hence the differentiation.

	FishyGoByeBye:	Apr 29th, 2011 at 17:25 GMT		2 points
	Impulse is sometimes denoted as J

	dlutz77539:	May 1st, 2011 at 15:17 GMT		4 points
	I've always used the greek letter "rho" for density. There may be another "d" out there?...

	plujan:	May 1st, 2011 at 21:42 GMT		3 points
	To be picky, the x in mole fraction is a Greek chi, not the letter x. You could have X be reactance, but then you'd have to change Y -- the only other thing I can think of Y being used for is hypercharge, and that's pretty magically obscure.

	kororaa:	May 8th, 2011 at 21:59 GMT		3 points
	amazing quiz :D

	epicirish:	May 18th, 2011 at 16:59 GMT		3 points
	Awesome idea and great variety of equations!

	zifyoip:	Jun 2nd, 2011 at 00:24 GMT		3 points
	There seems to be a typo in the formula for Z: the factor in parentheses, (1/n_i^2-1/n_i^2), looks like zero to me, which would make it a pretty uninteresting formula. Presumably one of those subscripts is supposed to be something other than i?

	zigfreid:	Jun 11th, 2011 at 22:21 GMT		1 point
	Excellent quiz, as always! But I would like to object to "moles" being the answer for "n" since moles is a unit rather than a physical quantity. I initially tried "number" and was about to skip over it when that didn't work. And, in the spirit of you and TimeAndTIde, astrophysics PhD student here. =)

	Sopz:	Jun 19th, 2011 at 17:02 GMT		2 points
	should definitely accept potential difference for voltage as that is the more correct term

	sproutcm:	Jun 20th, 2011 at 17:20 GMT		2 points
	@Sopz It already does accept 'electrical potential difference' because voltage isn't just any old potential difference.

	Grecocini:	Jun 20th, 2011 at 21:58 GMT		2 points
	Nice quiz

	myb555:	Aug 27th, 2011 at 13:10 GMT		-1 points
	I have to admit, it still bugs me when an editor makes a quiz in the category for which they are editor (This would probably get editors pick anyway because it is so good), but it makes me wonder how bad my own quizzes are that the editor has to make one in his own category to actually get in an editors pick....(still a nice quiz)

	sproutcm:	Aug 28th, 2011 at 15:34 GMT		0 points
	@myb555 Editor picks are used for a variety of reasons. This includes: highlighting a fun quiz that will never be of the quality for the front page, but good for people in the specific category; getting a quiz that you don't know if it is any good some exposure by people and experts to find the typos/errors/missing alternates; finding an old or a new gem and getting it exposure to see if it is front-page worthy; etc. The user section is all about trial balloons and experiments, and the Editor Picks allow us to get more plays on a quiz so we can see if it is any good or not. We are asked to try to make regular picks, and yes, we are allowed to pick our own quizzes, but we all try not to. Each editor has our email here on Sporcle, and if you think you've found a great quiz or have a great quiz that should be an Editor Pick, send us the link so we can look at it. It is impossible for us to see every single quiz that comes up. Some categories get 100's of quizzes a day contributed.

	myb555:	Aug 28th, 2011 at 18:52 GMT		0 points
	OK, i get it. So I guess my quizzes aren't even worthy enough to know if theyre good (haha jk).

	myb555:	Aug 29th, 2011 at 01:55 GMT		1 point
	Thanks for the editor pick. i just found out! (i take back that other comment)

	Laytruce:	Aug 31st, 2011 at 18:13 GMT		1 point
	Dang, I'm used to U being the symbol for voltage. A few others escaped me because I'm not a native English speaker (tried 'gravitation' and 'heat capacity' instead of heat, e.g.)

	tsneller:	Nov 26th, 2011 at 21:32 GMT		1 point
	You need to be more inclusive in what you let in as a right answer: 1) The one for n was always taught as the number of molecules 2) q needs to accept some form of the work energy, because that is what heat is, accept thermal energy at the very least (preferably accept energy on its own) 3) Could you accept energy for work, they are more or less the same thing Sorry to seem like such a nit-picker, but I really enjoyed this quiz, and want to make it better for later users (5 globes btw)

	sproutcm:	Nov 27th, 2011 at 15:19 GMT		2 points
	@tsneller 1) In chemistry n = number of moles and capital N = number of molecules so they are two different variables and this equation only works with the number of moles. 2) Well, work and heat are the two forms of energy, but each of them has their own variable in the sciences, and that equation is for finding the heat associated with warming up an object. So it isn't energy unless you can prove that that process also involves no work, and that would then be another equation. 3) Once again, work is a from of energy, but it is not total energy, and that equation is specifically for finding the work as a force is applied to a lever-arm. And to end I'll quote the chemistry version of the Law of Conservation of Energy: ΔE = q + w. So, for a given process, work and heat sum to the total energy change, but neither is the energy for the process, just a form of energy. Sorry to nitpick back, but this is what I do.

	zigfreid:	Dec 14th, 2011 at 22:04 GMT		1 point
	@spoutcm I still think you are being inconsistent with n. A mole is a /unit/, not a physical quantity. n could be measured in dozens for all that equation cares. I think that "number" is the only appropriate answer for that question. Otherwise, it is a very good quiz.

	nthe:	Jan 2nd, 2012 at 19:10 GMT		1 point
	'Heat' is noted by a capital 'Q'. Also, can you accept 'number of protons' for 'atomic number'?