A property that can be observed without changing the substance into another substance is a(n)___phyiscal property. A property that usually
requires changing the substance into another substance to be observed is a(n)___
property

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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.