Question

Which of the following is the best evidence

that digestion involves chemical change?
A Time is required to accomplish results.
B The products’ mass equals the reactants’
mass.
C Different compounds are involved.
D New substances are produced.

Answer 1

Digestion involves chemical change because new substances are produced.

Step-by-step explanation:

The best evidence that digestion involves chemical change is D. New substances are produced. In chemical reactions, the components of the reactants are all present in the products, and there is nothing present in the products that is not present in the reactants. This is because chemical reactions are governed by the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.

Answer 2

I think it is B. Because A has nothing to do with chemical changes because any change takes an amount of time, C because in a mixture different compounds are involved, It could be D though but A new substance is produced in other changes too thus it must be B.