Explain. how you would separate a mixture of water, sand, salt, and iron feelings into its four component parts

If a || b and e || f, what is the value of y ?

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?

What is a metal replacement reaction