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This question asks us to determine whether a diagram represents a physical or chemical change. A physical change is defined as a change where a substance alters its physical appearance but not its chemical composition. A chemical change occurs when a substance chemically transforms into a different substance. The diagram contains first two molecules of water, and one molecule of hydrogen gas. However, after some change, the diagram contains only two molecules of hydronium. Since hydronium is now present, but was not present before, we can conclude that the original substance chemically transformed into a different substance. This means that a chemical change occurred.