Question

a list of chemical and physical processes, a to h, is shown.
a combustion
b diffusion
c melting
d neutralisation
e photosynthesis
f reversible reaction
g roasting
h thermal decomposition

answer the following question about processes a to h.
state which of the processes a to h:
involves the breakdown of substances into simpler compounds when heat is applied.

Explanation:

Analyze the definition of the process

The question asks for a process that "involves the breakdown of substances into simpler compounds when heat is applied."

Match with the given options

• "Thermal" refers to heat.
• "Decomposition" refers to the chemical breakdown of a substance into simpler parts.
• Therefore, "thermal decomposition" matches the definition perfectly.

Answer:

• G roasting
• C melting
• I don't know
• H thermal decomposition (Correct answer)
• D neutralisation