What is the percent by mass of Ca in calcium chloride, CaCI2 (show your work)

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

How much energy is made when a pice of wood burns. how do you know

What is a metal replacement reaction