"Two images and two photos are shown and labeled, ""a,"" and ""b."" Image a shows a ball-and-stick model of a carbon atom single bonded to two oxygen atoms. The ball-and-stick model is labeled, ""C O subscript 2."" Above this model is a photo of dry ice in a mason jar of a clear liquid. The dry ice is sublimating. The photo is labeled, ""dry ice."" Image b shows four connected ring structures made up of alternating silicon and oxygen atoms that are single bonded to one another. The model is labeled, ""S i O subscript 2."" Above the model is a photo labeled, ""quartz."" It shows a solid crystal."
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