please answer Porosity is the fraction of material occupied by empty spaces. It can be expressed as a percent or a decimal. Assume that the porosity of a sample of sand and a sample of gravel is the same: 30 percent (0.30). Determine the porosity of a mixture of the sand and gravel, assuming that the sand fills the spaces between the gravel.

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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.

it is reliable if two scientists recorded it