A vacancy point defect will result in A decrease increase in the crystal volume
The presence of an empty space in the crystal lattice
Distortion of the crystal planes
All of the above

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.

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.