How many elements are there in the periodic table?

What is the definition of planetary differentiation? mixing of materials to produce a new compound divisions of planets based on constituent materials separation of materials based on density categorization based on chemical formula?

What happens to the chemical energy in fireworks as they explode

The [H3O+] concentration in the rainwater of pH = 4.35 is:

Calculate the percentage by mass of water in magnesium sulfate heptahydrate, MgSO4•7H2O Enter your answer with 3 significant figures

What are the thin fibers of the human nervous system that send messages between different parts of the body? A. nerves B. brain C. spinal cord D. eye

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.