Law Of Conservation Of Matter

Question 0

If two atoms of Na and 2 atoms of Cl are chemically combined to form the compound NaCl, how many atoms of Na and Cl are in the compound? (On the right side of the arrow.)
2 Na + 2 Cl –> 2 NaCl

Answer 0

There are still 2 atoms of Na and 2 atoms of Cl, but they are joined together now into 2 molecules of NaCl. The atoms do not disappear, they are still there, but recombined!

Question 1

4 grams of H and 32 grams of O are combined together. What is the final mass of the H2O that results?

Answer 1

36 grams of water. (Just add the masses together.)