You can take two liquids of different densities (how much mass is in a given volume) and pour them into a funnel. An example is oil and water. When the mixture settles, the denser liquid will be at the bottom, and drips through the funnel first. This is a separation that you can just let occur naturally.
Answer:
Because it went through a chemical change which changes its atomic form
Aluminum is 26.982 grams per mole, so 26.982/19.9 will give you the moles 1.3558794
Answer: Arsenic has five valence electrons.
Explanation: Good luck!
