5. If all the particles in a material are made up of several smaller particles, and every larger particle
is identical, is the material a pure substance or
not? Explain your reasoning.

No. Because a pure substance, no matter if an element, compound, it can only contain one kind of particle .

Explanation:

the right answer is c i just did the question.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.