midterm problems 2

midterm problems 2 - Lecture 2 Problems 1. Which of the...

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1. Which of the following procedures can be used to determine purity of an unknown compound? a) preparative column chromatography b) elemental analysis c) extraction d) recrystallization 2. Which method is most suitable for quantitatively establishing the composition of a sample? a) High Pressure Liquid Chromatography b) Crystallization c) Thin Layer Chromatography d) Preparative Column Chromatography 3. The melting point for a compound is defined as: a) the excitation of the molecules to break intermolecular forces b) the necessary heat required for a solid to convert to a liquid c) a pressure change which disturbs the solid lattice formation d) the temperature at which the vapor pressure of the liquid and solid are the same For questions 4-8, use the following temperature-composition phase diagram: 4. Which point(s) represent a mixture(s) consisting of both a solid and liquid phase? a) 1 only
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midterm problems 2 - Lecture 2 Problems 1. Which of the...

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