Question

Classify each of the following chemical reactions.

Upper S plus upper O Subscript 2 right arrow upper S upper O subscript 2.
Upper C a upper C l subscript 2 plus 2 upper A g upper N upper O subscript 3 right arrow upper C a (upper n upper O subscript 3) subscript 2 plus 2 upper A g upper C l.
Upper Z n plus upper C u upper S upper O subscript 4 right arrow upper C u plus upper Z n upper S upper O subscript 4.
2 upper N a subscript 2 upper O right arrow 4 upper N a plus upper O subscript 2.

Answer 1

1) S + O2 -> SO2
- Combination (synthesis) reaction — two elements combine to form one compound.

2) CaCl2 + 2 AgNO3 -> Ca(NO3)2 + 2 AgCl
- Double displacement (metathesis) reaction — ions exchange partners; also a precipitation reaction (AgCl(s) forms).

3) Zn + CuSO4 -> Cu + ZnSO4
- Single replacement (single-displacement) reaction — Zn displaces Cu from its compound (a redox displacement).

4) 2 Na2O -> 4 Na + O2
- Decomposition reaction — a compound breaks down into simpler substances (elements).