Evan has a rock. the rock has a mass of 12g and a volume of 4cm3. what is the density of the rock?

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

In which situation can a mixture always be called a solution

Identify the correct mole ratio for each substance. sodium chloride (nacl) na: cl = 1: ammonium nitrate (nhno) h: o = 4: