May 2010 SAT II Chemistry Thread

<p>does anyone know the answers to these questions?</p>

<ol>
<li>the energy diagram of A-B in the T/F section. was the rate raster A to B than B to A?</li>
<li>the graph of Hydrogen adding to Oxygen to form water?</li>
<li>(#8) is Al the one that acts as both acid and base?</li>
</ol>

<p>1) Yes
2) The exponential one
3) Yes</p>

<p>^ What I put…</p>

<p>

</p>

<p>I didn’t think an energy diagram could indicate rate of reaction. </p>

<p>

</p>

<p>I put (A), the graph with the positive linear slope then a plateau.</p>

<p>

</p>

<p>I think that’s what I put.</p>

<p>on the reaction rate on i put true, because the amount of energy required to reach the activation complex is less. That is why when a catalyst is added the reaction rate speeds up because it lowers the activation complex.</p>

<p>^ Right, that makes sense. Well, that’s at least one wrong.</p>

<p>on the hydrogen/oxygen/water one i put the one with a negative slope because as H is used up, H2O forms</p>

<p>i thought the energy diagram had nothing to do with rates
because that would mean all exothermic reactions would be faster forward?</p>