Do you know of any synthetic compounds that are meant to mimic natural compounds?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

One number is said to be an "order of magnitude" larger than another number if choose one: a. it is 10 times larger. b. it is 5 times larger. c. it is 3 times larger. d. it is 100 times larger. e. it is 2 times larger.

The unit of resistivity is the: ohm ohm-cm volt coulomb