Question

A scientist claims that a certain chemical will make fabric waterproof. Which

option describes a controlled experiment that will produce evidence that will
support or refute her claim?

Answer 1

Answer: She adds different amounts of the chemical to the material and then puts them in the water

Step-by-step explanation:

Answer 2

Answer: One group of fabric is treated with the chemical, and the other group is not. Then each group is exposed to water.

Step-by-step explanation: