TA Name Lab Section: Day _Time _
OPTICAL ISOMERISM 1. Construct a model that has a central carbon atom with 4 different colored spheres attached to it, representing four different atoms or groups. Draw a solid/dashed-wedge structure of this model he
When doing an extrac'on an emulsion layer may form. Adding a solu'on of saturated NaCl to the mix will o=en break up the emulsion. This is due to: A. The NaCl making the aqueous solu'on more ionic disfavoring miscibility of the solvent
STEREOCHEMISTRY AN EXERCISE WITH MOLECULAR MODELS Objective: To learn about the three-dimensional aspects of chemical structures and isomerism by using molecular models. Stereochemistry is a very important and reasonably subtle structural aspect of organi
Experiment 2: Recrystalliza4on
Calibra4on Curve Ques4on
Using the calibra4on curve shown below, the correct mel4ng point for a sample that has an observed mel4ng point of 100 C is
A.85 C B.92 C C.100 C D.108 C E.120 C
130 120 110 10
Experiment 7: Limonene
Steam Distillation and Optical Rotation
in citrus fruits (most abundant in oranges).
Limonene bp 176 oC d = 0.840 g/mL
can we separate limonene from other components?
Chem 51LA Fall `10
Lecture 1: Mel5ng Point
Sec5ons start Tuesday, Sep 28 WriFen Final Exam is Wednesday, Dec 1, 5-6:50 (loca5on TBA). Contact head TA immediately (email) if you have a class conflict! Mini-prac5cals in lab sec5ons (see
If crystals don't form during a recrystallization you should: A. give up and go home B. tell the TA C. scratch the inside of the glass flask to initiate crystallization D. add some more of the solvent
A student developed three normal TLC plate with same samples but different developing solvents. A<er the visualiza)on of samples, he could not remember which TLC plate corresponds to each solvent. Can you guess the correct
EXPERIMENT 7 ISOLATION OF LIMONENE FROM ORANGE PEELS
Tuesday, November 9 - Thursday, November 18, 2010 Technique: Steam Distillation Category: Purification Technique: Polarimetry Category: Identification Steam distillation is used to isolate organic compo
EXPERIMENT #5 Using Extraction to Separate a Mixture
Tuesday, October 26 Monday, November 1, 2010 Techniques: Extraction (acid-base), Recrystallization, Melting Point, TLC In this experiment, we will use an acid-base variation of the extraction technique
EXPERIMENT #4 Thin-Layer Chromatography
Tuesday, October 19 Monday, October 25, 2010 Technique: Thin-Layer Chromatography Category: Identification Thin-layer chromatography is a widely used identification technique. This method can be used to determine th
EXPERIMENT #3 Extraction and Drying Agents: Extraction of Caffeine from Tea.
Tuesday, October 12 - Monday, October 18, 2010 Techniques: Extraction, Filtration, Drying and Evaporation of Solvents Category: Purification In this experiment we will extract ca
EXPERIMENT #2 Recrystallization of Salicylic Acid and Bromoacetanilide
Tuesday, October 5 Monday, October 11, 2010 Technique: Recrystallization Category: Purification Recrystallization is one of the major techniques for purifying solid organic compounds.
EXPERIMENT #1 Identification of a White Solid
Tuesday, September 28 Monday, October 4 Technique: Melting Point Category: Identification The melting point of a compound is useful in establishing its identity and is a criterion of its purity. By finishing E