For a chemical reaction in a closed system, mass cannot be or . We can say that throughout the reaction mass is . A rearranged; destroyed; gained
B created; destroyed; lost
C rearranged; created; conserved
D created; destroyed; conserved

D created; destroyed; conserved

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.