CCO CCO Cremation Chemistry & Biology 1 — Questions and Answers
Question 1: At approximately what temperature does the human body undergo complete combustion during cremation?
- 600–800°F (316–427°C)
- 1400–1800°F (760–982°C) (Correct answer)
- 2200–2500°F (1204–1371°C)
- 3000°F+ (1649°C+)
Correct 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.
Question 2: What are the primary chemical compounds that make up cremated remains (bone ash)?
- Carbon and nitrogen compounds
- Calcium phosphate and calcium carbonate (hydroxyapatite) (Correct answer)
- Iron oxides and sulfates
- Sodium chloride and potassium chloride
Correct 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.
Question 3: Why do cremated remains appear white or gray rather than black?
- Because ash from organic material is white
- Because black carbon residue has been fully oxidized, leaving only white bone minerals (Correct answer)
- Due to the addition of chemicals during cremation
- Because a cooling process bleaches the remains
Correct 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.
Question 4: What chemical process primarily occurs in the primary combustion chamber during cremation?
- Hydrolysis
- Pyrolysis and combustion (oxidation) (Correct answer)
- Saponification
- Fermentation
Correct 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.
Question 5: Pacemakers contain lithium batteries that can explode during cremation because lithium reacts violently with:
- Nitrogen
- Water vapor and oxygen at high temperatures (Correct answer)
- Carbon dioxide
- Calcium phosphate
Correct 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.
Question 6: Approximately what percentage of a body's weight remains as cremated remains after complete cremation?
- 1–2%
- 3–4%
- 5–7% (Correct answer)
- 10–15%
Correct 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.
CCO CCO Cremation Chemistry & Biology 1
At approximately what temperature does the human body undergo complete combustion during cremation?