Predicting Products of Reactions

What is the balanced chemical equation for the synthesis reaction between potassium (K) and iodine (I)?

• K + I → KI

• 2K + I₂ → 2KI

• K₂ + I₂ → 2KI

• K + I₂ → KI₂

When water (H₂O) is electrolyzed, what are the balanced products of the decomposition reaction?

• H₂O → H + O

• H₂O → H₂ + O

• 2H₂O → 2H₂ + O₂

• H₂O → H₂O₂

Why does copper (Cu) displace silver (Ag) from silver nitrate (AgNO₃) in a single displacement reaction?

• Silver is more reactive than copper.

• Copper is more reactive than silver.

• Nitrate is more reactive with copper than with silver.

• The reaction is not a single displacement reaction.

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When lead(II) nitrate reacts with potassium iodide in an aqueous solution, what are the products and which one forms a precipitate?

• Lead(II) iodide (solid) and potassium nitrate (aqueous)

• Lead(II) nitrate (solid) and potassium iodide (aqueous)

• Lead(II) iodide (aqueous) and potassium nitrate (solid)

• Lead(II) nitrate (aqueous) and potassium iodide (solid)

What are the products when sodium nitrate reacts with ammonium chloride in an aqueous solution, and is a precipitate formed?

• Ammonium nitrate (aqueous) and sodium chloride (aqueous); no precipitate formed.

• Ammonium nitrate (solid) and sodium chloride (aqueous); a precipitate is formed.

• Ammonium chloride (aqueous) and sodium nitrate (aqueous); no precipitate formed.

• Ammonium chloride (solid) and sodium nitrate (aqueous); a precipitate is formed.

When sodium carbonate reacts with sulfuric acid, one of the initial products is carbonic acid. What does carbonic acid quickly decompose into?

• Carbon dioxide gas and water liquid

• Carbon monoxide gas and hydrogen gas

• Sodium bicarbonate and hydrogen gas

• Carbon and oxygen gas

When calcium reacts with water, how should water be conceptualized to correctly predict the products of this single displacement reaction?

• As H(OH), where the metal displaces hydrogen from the hydroxide group.

• As H2O, where the metal displaces oxygen.

• As H2O, where the metal displaces both hydrogen atoms.

• As H(OH), where the metal displaces the entire hydroxide group.