Question

finally, rinse off the paper clips with water. place them on a paper towel to dry. why the experiment works every material on earth is made up of chemicals. vinegar contains a chemical called acetic acid. the steel used to make paper clips contains iron and other chemicals. the copper in pennies is a ____, too (options: pencil, sweater, chemical). the changes you see in this experim when chemicals combine or break apar

Explanation:

The text states that every material on Earth is made up of chemicals. Vinegar has acetic acid (a chemical), steel (for paper clips) has iron and other chemicals. The sentence structure "The copper in pennies is a ____, too" implies consistency with the previous statements about materials being chemicals. So the correct answer is chemical as it fits the context of materials being composed of chemicals.

Answer:

chemical