lab_1_report_sheet

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San Diego State University *

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Chemistry

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Jan 9, 2024

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Cumberland High School Pre-AP Chemistry Name __________________________________ Period ________ Date ___ /___ /___ 1  Fundamentals of Chemistry Basic Laboratory Techniques: Report Sheet A. The Meterstick Length of this report sheet ______ in. ______ cm ______ mm ______ m Width of this report sheet ______ in. ______ cm ______ mm ______ m Using an equation (including units), show that the above measurements are equivalent Area of this report sheet ______ cm 2 B. The Graduated Cylinder Volume of water in graduated cylinder ______ mL Volume of water contained in largest test tube ______ mL C. The Thermometer and Its Calibration Observed temperature of water-and-ice mixture ______ o C Temperature of boiling water ______ o C Observed atmospheric pressure ______ mm Hg True (corrected) temperature of boiling water ______ o C Thermometer correction ______ o C D. Using the Balance to Calibrate Your 10 mL Pipet Temperature of water used in pipet ______ o C Corrected temperature ______ o C Trial 1 Trial 2 Trial 3 Mass of Erlenmeyer plus ______ ______ ______g ~ 10 mL H 2 O (gross mass) Mass of Empty Erlenmeyer (tare mass) ______ ______ ______g Mass of ~ 10 mL H 2 O (net mass) ______ ______ ______g Volume delivered by 10 mL pipet ______ ______ ______mL (show calculations) Mean volume delivered by 10 mL pipet (show calculations) ______mL Individual deviations from the mean ______ ______ ______ Average deviation from the mean (show calculations) ______mL Calibrated Volume delivered by your 10mL pipet: __________ mL ± ________mL

E. Measuring the Density of Antifreeze Temperature of antifreeze ______ o C Trial 1 Trial 2 Trial 3 Mass of flask + antigreeze ______ ______ ______ g Mass of empty flask ______ ______ ______ g Mass of antifreeze ______ ______ ______ g Density of antigreeze ______ ______ ______ g/mL (show calculations) Mean (average ) density Average deviation from the mean (show calculations) F. Post Lab Questions (to be answered in your lab notebook) 1. Identify each of the following as measurements of length, area, volume, mass, density, time or temperature. (a) ns (b) 10.0 kg/m 3 (c)1.2 pm (d) 750 km 2 (e)83 K ( f) 4.0 mm 3 2. Carry out the following operations and express the answer with the appropriate number of significant figures and units: (a) (5.231 mm)(6.1mm) (b) 72.3g/1.5 mL (c)31.03g / 0.0132g (d) 31.03 g + 12 mg 3. Drug medications are often prescribed on the basis of body weight. The adult dosage of Elixophyllin, a drug used to treat asthma, is 6 mg/kg of body mass. Calculate the dose in milligrams for a 150 lb person. 4. A man who is 5 ft 8 in tall weighs 160 lb. What is his height in centimeters and his mass in kilograms? 5. Determine the boiling point of water at 620 mm Hg. 6. A pipet delivers 9.98 g of water at 20 o C. What volume does the pipet deliver? 7. A pipet delivers 10.4 mL, 10.2 mL, 10.8 mL and 10.6 mL in consecutive trials. find the mean volume and the average deviation from the mean. 8. A 141 mg sample was placed on a watch glass that weighed 9.203 g. What is the weight of the watch glass and sample in grams? 9. Using the defined freezing and boiling points of water, make a plot of degrees Fahrenheit versus degrees Celsius on the graph paper provided.

10. (a) Determine the Celsius equivalent of 40 o F using your graph. The relationship between these two temperature scales is linear (that is it is of the form y = mx + b). consult the appendix in your book regarding linear relationships and determine the equation that relates degrees Fahrenheit to degrees Celsius. (b) Compute the Celsius equivalent of 40 o F using this relationship.

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