NOTES #4: Predicting Products (double replacement & combustion)

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NOTES #4: Predicting Products (double replacement & combustion) WCHS Chemistry NEED PERIODIC TABLE & ION SHEET

DOUBLE REPLACEMENT KCl NaNO3 KNO3 NaCl Step 1: Predict & name products Swtich ions! Cations (+) go with anions (-) Step 2: Write NEUTRAL formulas for reactants & products *Be careful!!! Formulas must be neutral (don’t just pull over the same # ions)! Step 3: BALANCE (if needed) Potassium nitrate Sodium chloride Potassium chloride + sodium nitrate → + + → + KCl NaNO3 KNO3 NaCl

DOUBLE REPLACEMENT Na2SO4 NH4I NaI (NH4)2SO4 Step 1: Predict & name products Step 2: Write NEUTRAL formulas for reactants & products Step 3: BALANCE (if needed) Sodium sulfate + ammonium iodide → + + → + Sodium iodide Ammonium sulfate Na2SO4 NH4I NaI (NH4)2SO4

COMBUSTION Step 1: Write the hydrocarbon and add oxygen Yields carbon dioxide (CO2) and water (H2O) Step 2: BALANCE Ex: The chemical formula for Ethane gas is C2H6. What is the full balanced equation for its combustion? + → + 7 oxygen HINT: Balance C and H first! :) 2 C2H6 3.5 7 O2 4 2 CO2 6 3 H2O THEN... DOUBLE EVERYTHING!!!!