1. Why is it necessary to heat the samples prior to collection of the headspace samples?

2. Was your unknown accelerant a pure substance or a mixture? What compounds) made up your accelerant?

3. Based on your accelerant identification, do the compounds you observe in the GC-MS match to expected compounds for this substance?

4. If the C/MS chromatographic elution peaks in the sample are far apart and analysis takes a relatively long time, should you increase or decrease the column temperature program to improve analysis time? Explain your reasoning.

5. Can paper chromatography be used to determine conclusively whether two ink marks came from the same pen?

6. Compare the retention factors of the spots from the different pens. Do any of the pens contain the same components in their black ink? Explain your reasoning.

7. Identify the brand of the unknown pen. Explain your reasoning.

\begin{tabular}{ll} Analyzed & \multicolumn{2}{c}{ Sample In } \\ Sample Type & :6/16/2014 3:03:26 PM \\ Sample Name & : Unknown \\ Sample ID & :4 \\ Vial \# & :4 \end{tabular} Lines:1 R.Time:1.565(Scandit:54) MassPeaks:251 RawMode-Averaged 1.560-1.570(53-55) BasePeake43.00(221362) BG Mode.Calc. froms Peak Group 1 - Event 1 Hiti:1 Entry:979 Library:NIST11.lib SI:97 Formula:C4H8O2 CAS:141-78-6 MolWeight:88 Retindex:586 CompName: Ethyl Acetate \$S Acetic acid, ethyl ester SS Acetic ether $5 Acetidin S\$ Acetoxyethan Hitin:2 Entry.980 Library-NIST11. lib SI:89 Formula:C4H8O2 CAS:590-90-9 MolWeight:88 Retindex:798 CompName: CH3C(O)CH2CH2OH$52-Butanone, 4-hydroxy- 55 Methylolacetone $5 Monomet Hit\#:3 Entry:4473 Library:NISTI1.lib SI:88 Formula:C5H8O3 CAS:617-35-6 MolWeight:116 Retlndex:822 CompName:Propanoic acid, 2-oxo-, ethyl ester SS Pyruvic acid, ethyl ester 55 Ethyl pyruvate 5S1 RInt Lane 1 is the pen brand BeGreen, lane 2 is the brand Bic, lane 3 in the brand PaperMat (1pts) Brand of pens: Pen \#1 brand: BeGreen Pen \#2 brand: Bic Pen \#3 brand :PaperMate Pen \#4 brand: Unknown