CCO CCO Cremation Chemistry & Biology

Question 1

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

Accepted Answer

1400–1800°F (760–982°C)

Answer

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)?

Accepted Answer

Calcium phosphate and calcium carbonate (hydroxyapatite)

Answer

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?

Accepted Answer

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

Answer

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?

Accepted Answer

Pyrolysis and combustion (oxidation)

Answer

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:

Accepted Answer

Water vapor and oxygen at high temperatures

Answer

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

(CCO) Certified Crematory Operator Practice Test

(CCO) Certified Crematory Operator Practice Test

CCO CCO Cremation Chemistry & Biology