Which of the following are pure substances? Explain.(a) Calcium chloride, used to melt ice on roads, consists of twoelements, calcium and chlorine, in a fixed mass ratio.(b) Sulfur consists of sulfur atoms combined into octatomicmolecules.(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 Oatoms bonded in a specific arrangement.

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Q: Which of the following are pure substances? Explain.(a) Calcium chloride, used to melt ice on roads,…

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.