Which statement best describes why the internal standard (tridecane) is used in this lab?

What safety precaution should you take when heating nitric acid solutions in the fume hood?

The concentration of Dodecane in the unknown sample can be determined by comparing its peak area with those of the calibration standards.

Choose ALL items that belong in the “as-made record” for stocks and standards:

The solvent used in this experiment (Hexane) is flammable and should be handled with care.

A calibration residual plot shows systematic curvature (positive residuals at mid-range). Best interpretation:

Which solvent’s spectrum shows a C=O band near 1715 cm⁻¹ but no C–O stretch?

When converting mL to L, divide by ________.

What steps should you take if your calibration curve does not produce a linear relationship?

Which are defensible reasons to reject and remake a calibration?  (Select all that apply)