Question

Which of the following reactions shows a chemical change producing a solid?

A. NaCl(s) - NaCl(aq)
B. H₂(g) + O₂(g) → H₂0
C. 2AgNO₃(aq) + CaBr₂(aq) + 2AgBr(s) + Ca(NO₃)₂(aq)
D. 2CH₂OH(1) + 30₂(g) → 2C0₂(g) + 4H₂0(l)

Answer 1

Option C, '2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq),' demonstrates a chemical change producing a solid precipitate, AgBr, which indicates a chemical reaction has occurred.

Step-by-step explanation:

The student's question specifically asks which reaction illustrates a chemical change resulting in the production of a solid. Among the given options, the correct option that shows a chemical change producing a solid is:

• C. 2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)

This reaction involves two aqueous solutions, silver nitrate (AgNO₃) and calcium bromide (CaBr₂), which react together to form solid silver bromide (AgBr) as a precipitate and aqueous calcium nitrate (Ca(NO₃)₂). This is a double displacement reaction where two compounds exchange ions to form two new compounds, including at least one solid precipitate, indicating a chemical change. The formation of the solid, AgBr, which precipitates out of the solution, is a clear indication of a chemical change.