AP Chemistry MC -- please help a poor soul!

Test Preparation AP Test Preparation
1

<ol>
<li>Which of the following is NOT true about the Bohr model of the hydrogen atom?</li>
</ol>

<p>(A) Electrons decay into the nucleus.
(B) The model cannot account for the ionization of an electron.
(C) An electron in a stable Bohr orbit does not emit radiation continuously.
(D) An electron may remain in an orbit indefinitely.
(E) The hydrogen atom absorbs radiant energy in multiples of hv.</p>

<ol>
<li>The primary specificity of enzymes is...</li>
</ol>

<p>(A) their polarity, which matches that of their specific substance
(B) their localized electron cloud
(C) their bonded transition metal, which is specific to the target substrate
(D) their locations within the cell
(E) their shape, which relates to the lock-and-key model</p>

<ol>
<li>When sodium hydroxide is added to a solution of saturated calcium hydroxide, which of the following precipitates would you expect to form?</li>
</ol>

<p>(A) Calcium
(B) Sodium
(C) Water
(D) Sodium hydroxide
(E) Calcium hydroxide</p>

<ol>
<li>Which of the following xenon compounds is/are polar?</li>
</ol>

<p>I. XeF4
II. XeO4
III. XeOF4</p>

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

<p>Thank you so much everyone</p>

<p>-Tommy</p>

2

<p>I think #2 is E because of the stuff I learned in Bio.</p>

3

<ol>
<li><p>I would say its A</p></li>
<li><p>I would agree with skateme, but the lock and key idea is technically wrong (the new hypothesis is induced fit). I don’t really know.</p></li>
<li><p>I would guess A. C,D,E are definitely wrong, and I’m pretty sure Sodium would dissolve.</p></li>
<li><p>C</p></li>
</ol>

4

<ol>
<li>Which of the following xenon compounds is/are polar?</li>
</ol>

<p>III. XeOF4</p>

<p>A polar molecule is a covalent bond with unequal sharing of the electrons caused by a difference in electronegativity. While the other atoms have differences in electronegativity, they are symmetrical and thus the polarity cancels out. This is the only non-symmetrical one.</p>

5

<p>thanks to all those who have responded!</p>

<p>anyone have any more opinions?</p>

6

<h1>2 doesnt look like AP chem to me, more like biology</h1>