Which one of the following types of change occurs when both the appearance and composition of a substance change?

مندرجہ ذیل میں سے کون سی تبدیلی کی تبدیلی اور اس وقت ہوتی ہے جب مادہ کی تبدیلی کی ظاہری شکل اور تشکیل دونوں؟

Physical change

Chemical change

Temporary change

None of these

A chemical change alters both the appearance and the composition of a substance.

Examples include rusting of iron or burning of wood, where new substances are formed.