A chemical equation is a way of describing how
A.
a mixture of substances are separated into two or more pure substances that do not react with each other.
B.
pure substances are combined into a mixture that has the same properties as the original substances.
C.
pure substances change to produce one or more pure substances with different properties from the original substances.
D.
a mixture of substances change to produce one or more mixtures with the same properties as the original substances.