13. A student mixes two colorless solutions together and notices that the new solution turns yellow. The student's reaction is an example of which of the following?
Answer: A
The student's reaction is an example of an observation.
The new solution turning yellow after mixing two colorless solutions is a direct observation made by the student. This change in color is a measurable and visible event that does not require further interpretation.
A) An observation
This option is correct as the student directly perceives the color change in the solution, which is a fundamental aspect of observation in scientific inquiry. Observations are the initial step in the scientific method, allowing students to gather data based on their senses.
B) A hypothesis
This option is incorrect because a hypothesis is a proposed explanation for a phenomenon that can be tested. The student's reaction does not involve making a prediction or assumption about the outcome; rather, it is simply noticing what happens when the solutions are mixed.
C) A conclusion
This option is incorrect as a conclusion is drawn after analyzing data and making interpretations based on observations. In this scenario, the student has not yet analyzed or interpreted the results; they have merely observed a change in the solution.
D) An inference
This option is incorrect because an inference involves making a logical interpretation or assumption based on observations. While the student observes the color change, they have not inferred the cause or implications of this change, which would be necessary to categorize it as an inference.
Conclusion
The correct answer, "an observation," highlights the importance of directly perceiving changes as the first step in scientific investigation. Options B, C, and D fail to accurately describe the student's action, as they involve stages of reasoning or interpretation that go beyond mere observation.