If a scientist comes across an unknown element, could she use
density to identify the element?
A. Yes, because each element has
a specific density
B. No, because density changes
easily.
C. Maybe, if she can determine the
element's melting point.
Density

idk i’m struggling too

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.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante