SAT Chemistry Questions

Archive SAT Subject Test Preparation
1

<p>Hi guys!
I have a few chemistry questions I want to ask.</p>

<ol>
<li><p>In a laboratory experiment to determine the formula of a hydrate, it is necessary to heat and measure the mass of the crucible and it contents more than once BECAUSE in a laboratory experiment to determine the formula of a hydrate, to ensure accurate results it must be verified that all the water has been driven off the sample.</p></li>
<li><p>There are no net changes in a system when it is at equilibrium BECAUSE when a system is at equilibrium, the concentrations of all species are equal.</p></li>
<li><p>Filter paper is customarily used to separate which of the following?
I. Two immiscible liquids
II. Two solids of different densities
III. A precipitate from a solution</p></li>
</ol>

<p>(A). I only
(B). II only
(C). III only
(D). I and III only
(E). II and III only</p>

<p>Thanks everyone!!!</p>

2

<ol>
<li><p>T T CE
You heat the crucible until the mass doesn’t change. Until then, more water is driven off each time and you can’t know whether it’s all gone.</p></li>
<li><p>T F
At equilibrium, concentrations are constant because the rates of the forward and reverse reactions are equal. This doesn’t mean that concentrations are equal…think about the dissolution of an insoluble salt or the dissociation of a weak acid.</p></li>
<li><p>C
[Filtration</a> - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Filtration]Filtration”>Filtration - Wikipedia)</p></li>
</ol>

3

<p>3 seems conveniently similar to something on the May 2011 Test. :P</p>

4

<p>it is? this question is from 2008 June</p>

5

<p>Question 3 appeared exactly as posted on the May 2011 test.</p>

6

<p>that’s no surprise. questions from the past get reused. but i swear this question is from 2008 June.</p>