Which statement describes a physical property related to the particles that make up a material?
A. A fruit has a sour taste because some of the compounds that
make it up are acids.
B. A vegetable has a bitter taste because some of the compounds
that make it up are bases.
C. Salt crystals are hard and brittle because they are made up of
atoms that combine by ionic bonding.
D. An iron nail has a reddish color because iron atoms on its surface
combine with oxygen atoms.