Sketch a diagram representing the particles in a concentrated solution and a dilute solution.

Why must a chemical equation be balanced? How do atoms and their compounds persist in the environment?

The reaction between limewater and the exhaled carbon dioxide in your breath is 

$\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)\to {\mathrm{CaCO}}_3\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Deduce what the formation of the precipitate suggest about the solubility of calcium carbonate.

State the chemical name and the physical state of $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2 \left(\mathrm{aq}\right)$.

State numbers to balance the following chemical reaction.

${\mathrm{\_\_MgF}}_2\left(\mathrm{aq}\right)+{\mathrm{\_\_Li}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)\to {\mathrm{\_\_MgCO}}_3\left(\mathrm{s}\right)+\mathrm{\_\_LiF}\left(\mathrm{aq}\right)$

State numbers to balance the following chemical reaction.

${\mathrm{\_\_RbNO}}_3\left(\mathrm{aq}\right)+{\mathrm{\_\_BeF}}_2\left(\mathrm{aq}\right)\to \mathrm{\_\_Be}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)+\mathrm{\_\_RbF}\left(\mathrm{aq}\right)$