Which of the following describes what happens in a chemical reaction? A. The atoms in the reactants stay together to make the products.
B. Some of the original atoms disappear and others are added to make products.
C. Atoms of the molecules in the reactants are rearranged to make new substances.
D. New atoms are formed that are put together to make new substances.

In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.