Which of the following are also compounds? Select all that apply. A.
H2O

B.
CuFeS2

C.
Cl

D.
Mg

E.
KCl

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore