CCO Cremation Chemistry & Biology Flashcards

At approximately what temperature does the human body undergo complete combustion during cremation?

Answer: 1400–1800°F (760–982°C)

Human remains are cremated at temperatures of approximately 1400–1800°F (760–982°C) to achieve complete combustion of organic tissue.

What are the primary chemical compounds that make up cremated remains (bone ash)?

Answer: Calcium phosphate and calcium carbonate (hydroxyapatite)

Cremated remains are composed primarily of calcium phosphate (hydroxyapatite) and calcium carbonate, which are the mineral components of bone.

Why do cremated remains appear white or gray rather than black?

Answer: Because black carbon residue has been fully oxidized, leaving only white bone minerals

After complete combustion, all carbon-based organic material is oxidized to CO₂ and water, leaving behind the white/gray calcium mineral structure of bone.

What chemical process primarily occurs in the primary combustion chamber during cremation?

Answer: Pyrolysis and combustion (oxidation)

Pyrolysis (thermal decomposition) and combustion (oxidation) break down organic tissue into gases, water vapor, and CO₂ in the primary chamber.

Pacemakers contain lithium batteries that can explode during cremation because lithium reacts violently with:

Answer: Water vapor and oxygen at high temperatures

Lithium reacts exothermically with water vapor and oxygen at high temperatures, causing explosive reactions that can damage the retort.

Approximately what percentage of a body's weight remains as cremated remains after complete cremation?

Answer: 5–7%

Cremated remains typically represent approximately 3.5% of a person's body weight, roughly 3–9 pounds, depending on bone density and body size.