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

Respuesta :

Answer:

they are pure substances: (b) and (d)

Explanation:

sulfur and cytosine are pure substances, since its composition does not changes even if the physical condition in which it is found changes.

These can not be broken down into othwer simpler substances using physical methods.

Pure substances have their own and definite characteristics.

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