A student strongly heats copper metal in air and obtains a black solid
CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
A student strongly heats copper metal in air and obtains a black solid. To justify that a chemical change has occurred, the student considers the following particle-level claims.
I. New Cu–O bonds are present in the black solid.
II. The mass of the sample increases due to incorporation of oxygen atoms.
III. The interaction between adjacent Cu atoms within the metal lattice is weakened by heating.
Which set of claims provides the strongest justification?
(a) I only
(b) II only
(c) I and II only
(d) I and III only