Ascientist makes the claim that chemicals like calcium chloride contain energy. which of the following
statements is the best piece of evidence to support this claim?
a. when calcium chloride reacts with water, the water becomes cloudy.
b. when calcium chloride reacts with water, the temperature does not change.
c. when calcium chloride reacts with water, the calcium chloride dissolves.
d. when calcium chloride reacts with water, the temperature changes.

d. When calcium chloride reacts with water, the temperature changes.

Explanation:

A scientist makes the claim that chemicals like calcium chloride contain energy. The evidence that supports this claim is that when calcium chloride reacts with water, the temperature changes.

The change in the temperature itself is an evidence of the presence of energy. Energy is said to change the temperature and in the calcium chloride solution, the change in temperature indicates that energy is produced.  

answer; the best answer is (demand);