Answer: This is true.
Explanation:
It is true because if becomes frozen, then it is physically harder to melt...
Explanation:
magnesium and sodium because they are minerals and part of iron
A system that releases heat to the surroundings, an exothermic reaction, has a negative ΔH by convention, because the enthalpy of the products is lower than the enthalpy of the reactants of the system. The enthalpies of these reactions are less than zero, and are therefore exothermic reactions
