Answer
A material that is composed of only one type of particle is a pure substance.
Calcium chloride consists of calcium and chlorine, in a fixed mass ratio, so it is not a pure substance.
Sulfur consists of sulfur atoms combined into octatomic molecules is a pure substance.
Baking powder containing sodium hydrogen carbonate and calcium dihydrogen phosphate is not a pure substance.
Cytosine, a component of DNA, consists of H, C, N, and O atoms bonded in a specific arrangement and is not a pure substance.
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