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When limewater (a solution of calcium hydroxide) has a certain gas bubbled through it, a precipitate forms.<br />
Write the balanced equation that shows why limewater turns cloudy.<br />
5. Suppose that you are given a cube of magnesium metal of edge length 1.0 cm. Calculate the number of Mg<br />
atoms in the cube. Atoms are spherical in shape, therefore the Mg atoms in the cube cannot fill all the available<br />
space. If only 74% of the space inside the cube is taken up by Mg atoms, calculate the radius in picnometers of<br />
a Mg atom. The density of Mg is 1.74 g/cm 3 , <strong>and</strong> the volume of a sphere is<br />
with a "known" value.<br />
4 ⋅ r<br />
3<br />
3<br />
⋅π . Compare your value<br />
5. Draw a fully-labeled "energy level diagram" that shows the energy changes that take place when gasoline,<br />
C8H18, is burned in air. Include the balanced equation on your diagram. Label all parts properly.<br />
12
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