A pure substance A is found to change upon heating into two new pure substances, B and C. C can be decomposed by chemical means, B cannot be decomposed by chemical means. From this we may conclude that ________.

Question

Quizplus · Accepted Answer

A substance that decomposes into two new substances upon heating must be a compound, making A and C compounds. Since B cannot be decomposed further, it is an element.

A Pure Substance a Is Found to Change Upon Heating