Question

A scientist designs some experiments to record how various substances change. She then reviewed her results. Which of the investigations listed below is an example of how the substance changed chemically?

Sodium metal reacts violently and explodes with water.


After heating aluminum in a crucible, it began melting at 1200 degrees F


Hydrochloric acid is stored inside plastic containers.


Grinding Copper sulfate allowed it to be dissolved much quicker.

Answer 1

Sodium reacting with water and exploding.

Step-by-step explanation:

the others are just melting, dissolving and storing a chemical. also I know its a chemical reaction because its the only answer that involves more than one chemical and has an actual change.

hope this helps :)