Final answer:
The best research question to identify whether the sample is gas or plasma is: Do the particles in the sample have an electric charge?
Step-by-step explanation:
The best research question that would help identify whether the sample is gas or plasma is: Do the particles in the sample have an electric charge? Gases consist of neutral particles, whereas plasmas consist of charged particles. By determining whether the particles in the sample have an electric charge, the researcher can differentiate between gas and plasma.
Learn more about identifying gas or plasma