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By Frank Brescia (Auth.)

ISBN-10: 0123955831

ISBN-13: 9780123955838

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29] E x p e r i m e n t 2: D A T A (Indicate Units) A . Aluminum bar No. (2) How many significant figures should you use in writing the density obtained by method (1)? , by method (2)? [31] EXPERIMENT 2: DATA Calculate the relative average deviation for your density measurements. What information would you require to calculate the error in your density measurement? Describe the modifications of method (1) that would be required in determining the density of a substance which is (a) soluble in water: (b) less dense than water: On the basis of your observations, list two specific properties of aluminum: If you had read the upper instead of the lower portion of the meniscus in the cylinder during both readings, the error in density would have been ( + , —, or 0) If you had read the upper portion for the first reading only If you had read the upper portion for the second reading only B.

When the insulation is an air space, a refrigerating head of at least 15 °C below the expected freezing point should be established. 8) Alcohol or acetone + dry ice As adjusted 0 -21 -30 -40 - 7 2 to - 7 9 Note: Material to be mixed with snow (or with finely crushed ice) should be precooled to ice temperature. Observation of the cooling curve: The observer should record temperature and time at regular intervals of about 30 sec. He should also note the time and temperature at which crystals first appear, and at which the curve passes through any maximum or minimum value.

Calibration of Volumetric Pipet and Volumetric Flask Volumetric pipet Volumetric flask Indicated volume (ml) Water temperature Density of water at Corrected weight of water (g) True volume (ml) Correction (ml) NAME [41] Experiment 3: A N S W E R SHEET Are the following corrections needed? (yes or no) Experiment Calibration of weights Buoyancy correction Calibration of volumetric ware (1) A standard (high-precision) solution of barium hydrox­ ide is made by weighing a specified amount of the powder into a given volume of solution (2) A piece of brass pipe is weighed before and after 10-min immersion in acid to determine any small weight change; brass weights are used (3) Same as (2); stainless steel weights are used (4) Same as (2), but different sets of brass weights are used before and after the immersion (5) The acid content of a sample of "sour salt" is determined by titrating it with the solution prepared in Experiment (1) above NAME GRADE CHEMISTRY CLASS INSTRUCTOR'S INITIALS DATE [42] Boyle's law states that, for a gas at constant temperature, the pressure times the volume (PV) is constant.

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Fundamentals of Chemistry Laboratory Studies by Frank Brescia (Auth.)


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