A student has two solid blocks that have different masses. The student knows that each block is composed of a pure substance, but she wants to know if the blocks are composed of the same pure substance. Which of these would best show that the blocks are composed of different substances? A. Both blocks can be scratched by a piece of glass. B. Both blocks sink when placed in water. C. One block conducts electricity and the other does not. D. One block has a greater volume than the other block.

L is a letter of the American English alphabet.

Explanation:

12 Years of English and College English Courses.

i'm pretty sure its b i might be wrong though!

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.