A student added 5 grams of calcium chloride, a white solid substance, to 15 grams of water at 220 C.  Several observations were made and the student inferred that a chemical reaction occurred.   Which observation best supports the student's inference that a chemical reaction occurred?   A. The calcium chloride dissolved in the solution.   B. The mass of the solution totals 20 grams.   C. The temperature of the solution is 350 C.   D. The solution became lighter in color.

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Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.