ATR–FTIR is avoided in forensic fiber analysis because it permanently alters the sample and prevents later testing.

If method blank is elevated, the most likely effect is:

The main reason to run a final CCV is to:

The nitric acid solution used for digestion should be added to ___________ (substance), never the reverse, to prevent a violent reaction.

A high intercept often indicates:

Why is it important to clean the FT-IR crystal with isopropanol and a Q-tip between samples?

Which is the BEST reason volumetric flasks are used for standards?

The mid-IR region commonly collected in this course is about ________ to ________ cm^-1.

You observed 6 key diagnostic bands for an unknown and 5 match the polyester reference. Compute percent agreement.

Which observations support the conclusion “Unknown 1 is cellulosic/cotton-type”?