Mixtures typically melt at different temperatures than the pure substances they are composed of. Brass is a mixture composed of copper and zinc, and it melts at temperatures between 820 degrees Celsius ( oC) and 1030 degrees Celsius ( oC). Why might different samples of brass melt at different temperatures? A. The samples are different in size and in volume.
B. The samples have different shapes and masses.
C. The samples are composed of different proportions of copper and zinc.
D. The samples have the same amounts of copper and zinc melting at different temperatures.