Express 0.00212 in scientific notation.

answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

hcl + naoh → h2o + nacl

explanation:

hcl + naoh → h2o + nacl   is the reaction that is correctly balanced.

however, pcl3 + h2 → ph3 +3hcl, 2ca+ 3cl2 → cacl3, and c5h12 + 5o2 → 5co2 + 6h2o are not correctly balanced.