Experiment: Two colorless liquids (ethanol and water) were mixed and the temperature increased.Observation: The beaker felt warm to touch.Question: What kind of process occurred?
Correct answer: D. Exothermic process due to bond formation.
- A. Endothermic process due to energy absorption.
- B. Neutralization reaction between acid and base.
- C. Cooling due to evaporation.
- D. Exothermic process due to bond formation.
Explanation
The correct answer is Option D: Exothermic process due to bond formation. The increase in temperature and the warmth observed indicate that heat was released during the process, which is characteristic of an exothermic reaction. In this case, the mixing of ethanol and water led to the formation of new bonds between the molecules, releasing energy in the form of heat. The other options are incorrect because there is no indication of energy absorption, neutralization reaction, or cooling due to evaporation in the experiment and observation provided.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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