<li>I got this one in the Kaplan book and Sparknotes too.</li>
</ol>
<p>Assertion-reason type</p>
<p>An increase in pressure in a closed container with an ideal gas leads to a decrease in volume?</p>
<p>The answer provided is true, and the explanation provided is that it follows from Boyle’s law. However, I doubt it, since the word ‘closed’ container seems to imply that the volume is fixed, in which case Boyle’s law would not hold.</p>
<p>2.</p>
<p>I’m also having some trouble with ionic/covalent questions</p>
<p>Ok, so most metal carbonates/halides, etc. are ionic, but Fajan’s rule for transition from ionic to covalent states (i dont know if this is part of the SAT syllabus) says differently. For example, AgI is predominantly covalent (by Fajan’s rule), and similarly most ionic compounds have some covalent character, sometimes dominating the ionic character, but Fajan’s rule doesn’t show exactly where to draw a line between covalent and ionic.</p>
<p>Or should I simply forget all this and mark ionic when I see a compund with a metal ion?</p>