Here are the word and balanced chemical equations for each reaction described:
a) Decomposition of Ammonium Nitrite
Word Equation: Solid ammonium nitrite decomposes to produce nitrogen gas and water vapor.
Chemical Equation: \[ \text{NH}_4\text{NO}_2 (s) \rightarrow \text{N}_2 (g) + 2\text{H}_2\text{O} (g) \]
b) Decomposition of Nitric Acid
Word Equation: Liquid nitric acid decomposes to produce nitrogen dioxide gas, liquid water, and oxygen gas.
Chemical Equation: \[ 4\text{HNO}_3 (l) \rightarrow 4\text{NO}_2 (g) + 2\text{H}_2\text{O} (l) + \text{O}_2 (g) \]
c) Reaction of Potassium Phosphate with Calcium Nitrate
Word Equation: Aqueous potassium phosphate reacts with calcium nitrate to produce a precipitate of calcium phosphate and aqueous potassium nitrate.
Chemical Equation: \[ 2\text{K}_3\text{PO}_4 (aq) + 3\text{Ca(NO}_3\text{)}_2 (aq) \rightarrow 6\text{KNO}_3 (aq) + \text{Ca}_3\text{(PO}_4\text{)}_2 (s) \]
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