10. according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

The mass of the reactants is always equal to the mass of the products.

Explanation:

Law of conservation of mass states that mass can neither be formed nor be destroyed but it can only be transformed from one form to another. This law is followed by all the balanced chemical reactions.

This law simply means that the total mass on the reactant side is always equal to the total mass on the product side.

For example: Formation of water from hydrogen and oxygen gas.

Total mass on the reactant side =

Total mass on the product side =

As, the total mass on the reactant side is equal to the total mass on the product side. Hence, this equation follows law of conservation of mass.

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explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.