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Females are more apprehensive when talking in class, but more nonverbally immediate, and prefer a collaborative learning style. Males prefer independent and avoidant learning styles, and report learning less than females.

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NBS Sta nd a rd Sa mple Polystyre ne 705 is s hown to exhibit a s mall , hut signific!mt , hypochromi s m in th e 38,300 c m -I region in se ve ra l so lve nt s c umpa red 10 th e mode l co m po und , e th ylbe nze n e. Bee r's law is not ubey e d for su luti un s uf th e pulyme r in a ll so lv e nt s. T he co nce ntra ti on depe nd e nce of th e ex tin ct ion coe ffi c ie nt is re late d to th e sca tt e re d li ght a nd it s de pe nde nce on th e ac ti vit y coefli cie nt of th e so lve nt. The s pec ific ex tin c ti on coe ffi c ie nts fo r polys t yren e 705 in c'yclo hexa ne a nd in ca rbon te trac hlo rid e a re 20 .89 an d 27.38, res pec ti vely.Key Word s: Caroll n te trac hlorid e, cyc lohexa ne, e th ylb e nze ne , ex tin c tion coe ffic ie nt , pulym e r, -po lys tyre ne. sol ve nt effec ts, ultra vi ole t a bso rpti on .