INSTRUMENTAL ANALYSIS ACS ACTUAL EXAM PAPER 2026 QUESTIONS WITH SOLUTIONS GRADED A+

INSTRUMENTAL ANALYSIS ACS ACTUAL
EXAM PAPER 2026 QUESTIONS WITH
SOLUTIONS GRADED A+

●● S/N relationships.
Answer: -increase S/N, increase run time
-decrease noise, increase S/N


●● Beer's Law.
Answer:


●● Beer's Law Calculations.
Answer:


●● Hard ionization vs soft ionization.
Answer: -hard: no M+ peak (or small)
-soft: M+ peak is visible


●● MS: hard ionization sources.
Answer: -impart high quantities of residual energy in the subject
molecule invoking large degrees of fragmentation

, ●● MS: hard ionization sources examples.
Answer: -electron impact


●● Electron Impact (EI).
Answer: -Uses electron impact to ionize a molecule
-gas phase
-energetic electrons
-possibility of over fragmentation
-hard
-most common


●● EI advantages.
Answer: -good stability
-universal ionization
-reproducible spectra


●● EI disadvantages.
Answer: -MW can be hard to determine
-compatible only with volatiles (GCMS)
-Hard to make negative ions


●● MS: soft ionization sources.