Daily Science January 13

Predict the products of the following reactions and balance them: C3H8 + O2 Sodium and nitrogen react Calcium Fluoride decomposes when heated Fe (II) + Na3PO4 Sodium chloride reacts with magnesium bromide

PG. 69

Reactions in Aqueous Solutions

Net ionic equations

In double replacement reactions, not all ions participate in the reaction

Double replacement reactions result in the formation of a precipitate

Ions that don’t participate are called spectator ions

Can write equations to show which ions participate

Called net ionic equations

Rules for writing net ionic equations

1. Write out the equation and separate all the ions with their charges

1. Be sure to include the state of matter for each ion2. Everything that is aqueous is separated3. Solids, liquids, and gases stay in their respective

compounds4. If water is produced, it is not split up

2. Cross out ions that are seen in both the reactants and products.

3. Rewrite the equation to include only the ions that participate in the reaction

Practice problems

Aqueous solutions of potassium iodide and silver nitrate are mixed forming the precipitate silver iodide

Aqueous solutions of aluminum chloride and sodium hydroxide are mixed forming the precipitate aluminum hydroxide.