By Bettelheim F.A.
The forty eight experiments during this well-conceived handbook illustrate vital strategies and rules normally, natural, and biochemistry. As in prior variants, 3 easy objectives guided the improvement of all of the experiments: (1) the experiments illustrate the options realized within the school room; (2) the experiments are essentially and concisely written in order that scholars will simply comprehend the duty handy, will paintings with minimum supervision as the guide presents sufficient details on experimental tactics, and should manage to practice the experiments in a 2 1/2-hour laboratory interval; and, (3) the experiments aren't in basic terms basic demonstrations, but in addition comprise a feeling of discovery. This version comprises many revised experiments.
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Extra resources for Laboratory Experiments For General, Organic and Biochemistry
001 g (10). Calculate the weight of the recovered sand by subtraction (11). 15. Calculate a. Percentage yield using the formula: % yield ϭ Harcourt, Inc. grams of solid recovered ϫ 100 grams of initial sample Experiment 4 43 b. 132 g (original sample) Chemicals and Equipment 1. 2. 3. 4. 5. 6. 7. 8. 9. 44 Unknown mixture Balances Boiling chips Evaporating dish, 6 cm Filter paper, 15 cm Mortar and pestle Oven (if available) Ring stands (3) Rubber policeman Experiment 4 Harcourt, Inc. NAME SECTION PARTNER GRADE DATE Experiment 4 PRE-LAB QUESTIONS 1.
Weight of ﬁlter paper and copper, Cu ______________ g 4. Weight of Cu: (3) Ϫ (2) ______________ g 5. Weight of Cl in sample: (1) Ϫ (4) ______________ g 6. Gram atomic weight of Cu ______________ g 7. Gram atomic weight of Cl ______________ g 8. Number of moles of Cu atoms in sample: (4)/(6) ______________ moles 9. Number of moles of Cl atoms in sample: (5)/(7) ______________ moles 10. Mole ratio of Cu atoms to Cl atoms: (8)/(9) ______________ 11. Simple whole number mole ratio of Cu atoms to Cl atoms ______________ 12.
Wear gloves when working with this acid. 8. Place in separate clean, dry test tubes (100 ϫ 13 mm) 2 mL of distilled water and 2 mL of the residue liquid from the boiling ﬂask. Obtain a clean nickel wire from your instructor. In the hood, dip the wire into concentrated nitric acid and hold the wire in a Bunsen burner ﬂame until the yellow color in the ﬂame disappears. Dip the wire into the distilled water sample. Put the wire into the Bunsen burner ﬂame. Record the color of the ﬂame. Repeat the above procedure, cleaning the wire, dipping the wire into the liquid from the boiling ﬂask, and observing the color of the Bunsen burner ﬂame.