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Which of the following are pure substances? Calcium chloride, used to melt ice on roads, consists of two elements, calcium and chlorine, in a fixed mass ratio. Sulfur consists of sulfur atoms combined into octatomic molecules. Cytosine, a component of DNA, consists of H, C, N, and O atoms bonded in a specific arrangement. Baking powder, a leavening agent, contains 26% to 30% sodium hydrogen carbonate and 30% to 35% calcium dihydrogen phosphate by mass.