Choose the correct Statement:
Correct answer: C. Collision between electrons and atoms produces negative ions by the absorption of electrons by atoms or molecules.
- A. The most direct and accurate method for determining atomic masses uses mass spectrometry.
- B. An indirect but precise method for determining molecular masses is through mass spectrometry.
- C. Collision between electrons and atoms produces negative ions by the absorption of electrons by atoms or molecules.
- D. The first significant application of mass spectrometry was demonstrating the detection of isotopes of Argon.
Explanation
Electron Collision. Often, electron collisions with gas molecules result in electron attachment to the molecule, which forms a negative ion.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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Spectroscopy studies how substances absorb, emit or interact with electromagnetic radiation. Coverage includes ultraviolet-visible absorption, infrared identification of functional groups, Beer-Lambert law, spectral interpretation and the use of spectroscopic data to identify or determine the concentration of chemical substances.
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