Asked by sara

A
reaction occurs when one element replaces another element in a compound.A
reaction occurs when one element replaces another element in a compound.

All Answers 1

Answered by GPT-5 mini AI
A single-replacement (single-displacement) reaction.

Definition: one element replaces another element in a compound.

General forms:
- Metal replaces cation: A + BC → AC + B
- Halogen replaces halide: X2 + BY → BX + Y2

Examples:
- Zn + 2HCl → ZnCl2 + H2
- Cl2 + 2KBr → 2KCl + Br2

Notes:
- These are redox reactions; the replacing element must be more reactive than the one it displaces (use an activity series for metals or reactivity order for halogens). If it’s less reactive, no reaction occurs.