Colors for Chemistry SAT II?

Test Preparation SAT Subject Test Preparation
1

<p>Does anyone know (or know where I can find) the colors we need to know for certain ions, precipitates, flame tests, etc?</p>

2

<p>Same question; I need to know the ion and precipitate colors we need to know. </p>

<p>For the flame tests (from barron’s):
Na: yellow
Li: crimson
Ca: orange red
Sr: bright red
Ba: green
K: violet </p>

<p>Now, allow me to ask a question of my own: Is the heat of vaporization ALWAYS greater than the heat of fusion? If so, WHY?</p>

3

<p>Same question; I need to know the ion and precipitate colors we need to know. </p>

<p>For the flame tests (from barron’s):
Na: yellow
Li: crimson
Ca: orange red
Sr: bright red
Ba: green
K: violet </p>

<p>Now, allow me to ask a question of my own: Is the heat of vaporization ALWAYS greater than the heat of fusion? If so, WHY?</p>

<p>Edit: Crud… double posted -> oops!</p>

4

<p>i don’t think it’s “greater,” isn’t the potential energy just higher?</p>

5

<p>^It is greater. not sure why though</p>

6

<p>Wouldn’t the heat of vaporization always be an endothermic process, while heat of fusion would be an exothermic process, the gas is releasing heat to go back to liquid? Therefore, endo (+) is always greater than exo (-).</p>

<p>Not sure though, so don’t quote me on it ;)</p>

7

<p>Don’t forget litmus tests!</p>

<p>Red in acidic/blue in basic</p>

<p>And the Heat of Vaporization > Heat of Fusion since it takes more energy to break the attractions between the liquid water molecules than the solid water molecules. That’s why in a heating curve, the flat line for the liquid to gas is longer than solid to liquid</p>