ATR spectra of small, curved fibers depend strongly on contact geometry with the crystal.

What should be done to prevent damage to the MP-AES instrument after a sample analysis?

If two candidate compounds both contain esters, which region is most useful to differentiate them in this lab?

Direct transfer refers to fibers moving from the original source to another object during contact; secondary transfer involves an intermediate carrier.

Which diagnostics most directly affect “accuracy” if they fail? (select all that apply)

Which fiber type is expected to show broad O–H and strong C–O (1200–1000 cm⁻¹) but no strong amide I at 1650 cm⁻¹?

When performing a wavelength calibration, which sample tubing color is used for the calibration solution in the 4200 MP-AES instrument?

A single peak assignment (e.g., ‘I saw a carbonyl’) is sufficient to uniquely identify most organic liquids.

A high R² alone proves a calibration is valid for samples prepared in a different acid matrix than the standards.

A strong peak around 1600 cm⁻¹ in an FT-IR spectrum is indicative of an aromatic C-H stretch.