Describe the placement of the crucible lid on the crucible when heating the magnesium. why is it important that this be done correctly?

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

lol for the pointsss

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.