<p>yeah, its E</p>
<p>thnx for the explanation</p>
<p>is it (A) 1/25.00</p>
<p>yea its A:</p>
<p>Equation II is formed by reversing Equation I and doubling all the coefficients. So you inverse K of Equation I since it is reversed, and then you square it, as the coefficients are doubled (5 becomes 1/5, and then 1/25)</p>
<p>yep, its A</p>
<p>i often forget you have to square the K value before taking its reciprocal.</p>
<p>I feel like we're not posting enough questions--- come on guys, SAT is tomorroww!</p>
<p>Analysis by mass of a certain compound
shows that it contains 14 percent hydrogen
and 86 percent carbon. Which of the
following is the most informative statement
that can properly be made about the
compound on the basis of these data?
(A) It is a hydrocarbon.
(B) Its empirical formula is CH2.
(C) Its molecular formula is C2H4.
(D) Its molar mass is 28 g/mol.
(E) It contains a triple bond.</p>
<p>kornpopz, T,T,N??
Al3+ needs 3 more electrons to become Al metal; reduction means gain of electrons...
not sure about the CE part, tho</p>
<p>I'm guessing B for this one</p>
<p>In order to make a buffer solution, a weak monoprotic acid could be added to:</p>
<p>A) another acid
B) another base
C) it's conjugate base
D) it's conjugate acid
E) a strong base</p>
<p>is the answer A? Since the percentages add up to 100, the compound can only contain hydrogen and carbon</p>
<p>kornpopz, B
86/12 gives 7 and 14/1 gives 14
so for 7 atoms of carbon, 14 atoms of H
thus, CH2</p>
<p>its T/T/N. you're right neutralnuke. </p>
<p>as for my last question, i dunno if many teachers show it like this but ours had a rhyme for solving emp. formula (which literally runs through my mind b4 i attempt to do these)</p>
<p>Percent to Mass
Mass to Mole
Divide by least
Multiply 'til whole</p>
<p>MKDaMan: C?
can't think of a reason right off the bat</p>
<p>cmu hopeful, A is what I put the first time I took it too!.....I think its unfair for CB to put two correct answers and expect us to distinguish which is the "MORE" correct one based on the limited time we do get.</p>
<p>The primary intermolecular attraction that makes it possible to liquefy hydrogen gas is called:
a) london dispersion forces
b) dipole-dipole attraction
c) covalent bonding
d) ionic bonding
e) hydrogen bonding</p>
<p>C is correct: Buffer solutions are made with a weak acid and a salt containing its anion. So to make a buffer solution with a weak monoprotic acid, the addition of its corresponding salt is required. The salt must contain the anion, or conjugate base, of the acid. Therefore, choice C is correct.</p>
<p>For this question, I'd say e, but I'm not sure</p>
<p>is it A neutralnuke?</p>
<p>I think hydrogen bonding is with only O,F, or N. I think it might be dispersion</p>
<p>its A, any reasons?</p>
<p>is formal charge going to be on the test?</p>
<p>When in doubt, put down LDF!</p>
<p>Hydrogen bonding as cmu hopeful says is only w/ O, F, N (and possibly w/ C?)
H-H bonds are neither covalent, nor ionic
and dipole attraction requires polarity, but there is no polarity b/w two same elements</p>
<p>Since hydrogen is bonding to itself, it's a weak and short lived bond. It has something to do with the position of electron clouds at a particular moment.</p>