---
tags:
  - science/chemistry
  - reactions
created: 2026-05-16
breadcrumb: "Chemistry > Reactions > Chemical reactions"
---

# Chemical reactions

> **Mechanism:** Rearrangement of atoms; mass conserved

## Items

- **Balancing** — Atoms in = atoms out for every element. Coefficients balance the equation.
- **Synthesis** — A + B → AB.
- **Decomposition** — AB → A + B.
- **Single replacement** — A + BC → AC + B.
- **Double replacement** — AB + CD → AD + CB.
- **Combustion** — Fuel + O₂ → CO₂ + H₂O + energy.
- **Acid / base** — Brønsted: proton transfer. pH = −log[H⁺].
- **Redox** — Electron transfer; oxidation = loss, reduction = gain (OIL RIG).

## Related

- [[atoms-bonding]]