Answer:
C. Xenon
Explanation:
The question only requires you to use your visual skills to identify the unknown gas. Look at the spectra of unknown gas and xenon, are they not identical? SInce they are same, the unknown sample must be xenon.
Answer:
fractional distillation since ot depends on the different liquids to have different boiling points
Answer:
friction
Explanation:
the resistance that one surface or object encounters when moving over another.
