Chemistry
Chemistry
Problem
Which of the following substances will leave a black residue on strong heating? a. b. c. d.Intuitive explanation
When organic compounds burn in limited oxygen, they often decompose incompletely, leaving behind carbon — which is black. The key is recognizing which substances are carbon-rich and will char rather than fully combust or simply melt. Look for compounds with high carbon content and complex structures that break down under heat; simple inorganic salts or fully oxidized compounds won't produce this black residue.
Intuitive explanation
When organic compounds burn in limited oxygen, they often decompose incompletely, leaving behind carbon — which is black. The key is recognizing which substances are carbon-rich and will char rather than fully combust or simply melt. Look for compounds with high carbon content and complex structures that break down under heat; simple inorganic salts or fully oxidized compounds won't produce this black residue.