A reddish powder is heated gently in a loosely covered container.After the heating a silvery metal remains in the container,and a glowing wooden splint placed into the container bursts into flame.The original substance is a(an)________,and the solid and gas produced are ________.
A)element;compounds
B)compound;elements
C)mixture;compounds
D)compound;compounds
E)mixture;elements

Question

Quizplus · Accepted Answer

The fact that a compound is being heated and then breaks down into a silvery metal (element) and a gas that reacts with a wooden splint (likely oxygen), suggests that the original substance was a compound. Therefore, options A and E (which suggest that the original substance was either an element or a mixture) can be ruled out. Additionally, since only one silvery metal (element) is formed, and the gas produced is likely oxygen (also an element), option D (which suggests that both the solid and gas produced are compounds) can also be ruled out. This leaves option B (compound; elements) as the correct choice.

A Reddish Powder Is Heated Gently in a Loosely Covered