Which statement describes an atomic nucleus?
an atomic nucleus is negatively charged.
an atomic nucleus has no electrical charge.
an atomic nucleus consists of mostly empty space.
an atomic nucleus contains most of the atom’s mass.

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So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen