<span>If energy is released, the reaction is exothermic. If energy is absorbed, the reaction is endothermic. Since heat is being absorbed in this reaction (to break down H2O into H2 and O), the reaction is endothermic.</span>
Answer: an air compressor and desk chair.
Explanation:
It is about equal to the mass of the neutron. So, most people just say that they have the same mass.
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The answer is B. The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.
