Circle the choice that gives the best evidence that a chemical reaction occurred. A. The molecules were separated into individual atoms.
B. The mass of the magnesium changed.
C. Smoke that was trapped between the magnesium atoms was given off.
D. A new substance was formed.

Why does a cake rise when you bake it? ♡

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.