A student wanted to create an investigation that showed how chemical weathering affects building materials. How would the student simulate this experiment?

What’s the percent by mass of carbon in c10h14n2

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.