The text structure of the passage you provided is sequential or chronological. This structure outlines the steps of an experiment in the order they occurred.
Clues that indicate this structure:
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Use of Time-Order Words/Phrases: Words like "first," "then," "next," and "immediately" signal a sequence of events.
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Step-by-Step Description: The passage describes actions in a specific order, showing the process of performing an experiment.
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Focus on Events: The text focuses on what the scientist did first and what happened as a result of those actions, emphasizing the progression from one step to the next.
Overall, the sequential structure helps readers understand the flow of the experiment and the cause-and-effect relationships between the steps.