Experiment 2: Measurements and Graphing Experiment 1: Units and Measurements A. Mass You would have learnt by now, that the mass of an object is the quantity of matter contained in that object. The...

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Experiment 2: Measurements and Graphing Experiment 1: Units and Measurements A. Mass You would have learnt by now, that the mass of an object is the quantity of matter contained in that object. The weight, on the other hand, is the force with which earth (or any other planet where the object is located) attracts the object due to gravity. A given object has a certain mass which is independent of gravity, but the weight depends on gravity. If gravity is constant, weight is proportional to gravity, and the two terms are sometimes used synonymously. Look at the labels on the packages/boxes of five solid materials (of different sizes) in your household or a grocery store (e.g., sugar, baking powder, coffee, ….) and copy down the weights both in ounces and grams (If the label shows ounces, and not pounds, convert the ounces to pounds using the fact that 1 lb = 16 oz. Similarly, if the label shows kilograms, convert it to grams using the fact that 1 kg = 1000 g). Enter the information in the data sheet provided in this handout. For each material, calculate the grams-to-pounds ratios (i.e., Divide the weight in grams by the weight in pounds).. Compare those ratios for all the materials. Also calculate an average for those ratios. What do you expect? Should the grams-to-pounds ratios be the same or different for different materials? B. Volume While the mass is the quantity of matter contained in an object, the volume is the amount of space the object occupies. The volume is expressed as drams, fluid ounces, pints, quarts, gallons, etc., in the English system, and as milliliters, deciliters, liters, etc ., in the Metric system. Look at the labels on the bottles/jugs of five liquid materials (of different quantities) in your household or a grocery store (e.g., milk, oil, beverages, vinegar, ….) and copy down their volumes in both English and Metric systems. For each system, convert the data to a common basis, fluid ounces in the English system and milliliters in the Metric system (1 gallon = 4 quarts = 8 pints = 128 fl. Oz, and 1 L = 1000 mL). Enter the information in the data sheet provided in this handout. For each material, calculate the milliliters-to-fluid ounces ratios (i..e, Divide the volume in milliliters by the volume in fluid ounces). Compare those ratios for all the materials. Also calculate an average for those ratios. What do you expect? Should the mililiters-to-fluid ounces ratios be the same or different for different materials? C. Length (or distance) Print this page and follow instructions. This page contains six pairs of points shown as “x”s and labeled as (A1 and B1, A2 and B2, … A6 and B6). To do this part, you will a ruler that is marked both in inches and in centimeters (or two separate rulers one for inches and one for centimeters). Draw a line connecting the two points in each pair, and measure the distance between the points both in inches and centimeters, as precisely as possible (If you are using a ruler in which each inch is divided into 8 or 16 divisions, then measure the distances precisely to one-sixteenths of an inch; you will have to convert them later into decimal values. If, on the other hand, each inch is divided into 10 divisions in your ruler, measure directly in decimal values (you can be precise to 0.05 th of an inch). In all rulers, each centimeter is divided into ten little divisions (i.e., millimeters). Also measure the length and width of the printed sheet in both inches and centimeters.. Record the distances in the appropriate data table shown in the data sheet(s) provided, and carry out the analysis as suggested in the instructions sheet. x (A1) x (A2) x (A3) x (A4) x (A5) x (A6) x (B6) x (B5) x (B4) x (B3) x (B2) x (B1) Data Sheet A. Mass Material English Metric grams/pounds Label data Pounds Label data Grams Mean (Average) B. Volume Material English Metric mL / fl.Oz Label data Fl Ounces Label data Milliliters Mean (Average) C. Length (Distance) Line English Metric centimeters ---------------- inches Inches (in 1/16ths) Inches (as decimal fractions) Centimeters A1, B1 A2, B2 A3, B3 A4, B4 A5, B5 A6, B6 Length Width Mean (Average) Post-lab questions: 1. How do the grams/poundss ratios compare with each other for the various materials tested? What do you expect? Should they be the same or different? Why? Calculate an average for those ratios? What information do you get from it? What is the accepted value? Calculate the percent error for your experimental average.. . 2. ow do the milliliters/fluid ounces ratios compare with each other for the various materials tested? What do you expect? Should they be the same or different? Why? Calculate an average for those ratios? What information do you get from it? What is the accepted value? Calculate the percent error for your experimental average.. 3. How do the centimeters/inches ratios compare with each other in your length measurements What do you expect? Should they be the same or different? Why? Calculate an average for those ratios? What information do you get from it? What is the accepted value? Calculate the percent error for your experimental average.. 4. Do the following conversions, using your experimental average ratios. 12.5 kg to pounds 12.5 pounds to kilograms. 390 milliliters to fluid ounces 0.390 fluid ounces to milliliters 66.0 inches to centimeters 66 centimeters to inches
Aug 21, 2021
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