How do the products and reactants of a chemical change compare?

The mass of the products is greater than the mass of the reactants because energy is absorbed by the reaction.
The mass of the products equals the mass of the reactants because energy is not absorbed or given off by the reaction.
The mass of the products is less than the mass of the reactants because energy is given off by the reaction.
The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction.

Question

How do the products and reactants of a chemical change compare?

 The mass of the products is greater than the mass of the reactants because energy is absorbed by the reaction.
 The mass of the products equals the mass of the reactants because energy is not absorbed or given off by the reaction.
 The mass of the products is less than the mass of the reactants because energy is given off by the reaction.
 The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction.

blm1 · Answer

@Qwertty123  @Rushwr

qwertty123 · Answer

In a chemical reaction you can not create or destroy matter. There must be the same number of each atom present at the end of the reaction as there were at the beginning. Since all the atoms that were there at the start are still there at the end then the mass has to be the same. The products mass is equal to the reactants mass This is the law of conservation of mass. ~Lexi R https://answers.yahoo.com/question/index?qid=20100507134449AAtuzpf

blm1 · Answer

Well I already knew that much XD

qwertty123 · Answer

oh.. 
Mass can not be created in a simple chemical reaction, besides in reality, most of the time the total mass of the product INTENDED by the reaction is not the same as the total mass of  reactants because some other NON-desired products are created within the reaction.

blm1 · Answer

From my glossary- Chemical Change: A change to one or more substances when they become new or different substances through the breaking and forming of chemical bonds.

Chemical Reaction: Another name for a chemical change, where the atoms in one or more substances are rearranged to form new substances.

rushwr · Answer

Take this simple example 
$$NaOH + HCl \rightarrow NaCl + H2O$$Okai so the left side has the same amount of elements as in the right side !

rushwr · Answer

basically all the elements in th right side are there in the left side because if not u can't balance an equation right ? SO what do u think the answer is ?

blm1 · Answer

The last one

rushwr · Answer

yep that's right ! I hope you understand it :)

qwertty123 · Answer

CORRECT! :D

blm1 · Answer

Yes @PianoGirl3 just told me. BTW she is my sister.

rushwr · Answer

oh cool !!!!!! :)