A characteristic of a substance that may be observed or measured without changing the composition of the substance is a(n) ___ property. A)chemical

B)intensive

C)physical

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

5.6⋅10−^19  j

do you need the explaination?