Elements and compounds Original Scenario-Based Download PDF

Questions

1. 1.

   During an interstellar survey mission, an automated probe analyzes two newly discovered pure samples, designated Specimen Zenith and Specimen Nadir. High-energy chemical tests reveal that Specimen Zenith cannot be decomposed into simpler substances by any physical or chemical process, and spectroscopic analysis confirms it contains only one type of atom. In contrast, passing an electric current through molten Specimen Nadir causes it to break down into two distinct pure substances in an exact, invariant mass ratio. Based on these findings, which conclusion correctly classifies these two specimens?

   • A) Specimen Zenith is an element because it cannot be broken down into simpler substances by chemical means, whereas Specimen Nadir is a compound because it decomposes into simpler substances in a fixed ratio.
   • B) Both Specimen Zenith and Specimen Nadir are elements because both samples were verified to be pure materials collected in a natural state.
   • C) Specimen Zenith is a compound because it resists chemical degradation, whereas Specimen Nadir is an element because electrical currents can liberate its internal components.
   • D) Specimen Zenith is a homogeneous mixture because its composition remains completely uniform under stress, whereas Specimen Nadir is an element that produces multiple gases.