Suppose you want to test if a sample compound is ionic.
You have these materials: the solid compound, a glass
container, a spoon, and a conductivity apparatus. What
material is missing from your list, and why is it
necessary?

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.

5 structural isomers

the isomers are:

n-exane :   ch3ch2ch2ch2ch2ch3

2-methylpentane :   ch3ch(ch3)ch2ch2ch3

3-methylpentane :   ch3ch2ch(ch3)ch2ch3

2,3-dimethylbutane :   (ch3)2chch(ch3)2

2,2-dimethylbutane :   (ch3)3cch2ch3