1000 900 800 700 600 500 400 300 200 100 A sample of liquid has a measured volume of 561 mL. 1. How many significant figures does the measurement have? 2. Suppose the volume measurement was made with a graduated cylinder just as you see above. How far apart were the scale divisions on the cylinder, in mL? 3. Which of the digits in the measurement is uncertain?

Wire Wire 1 0.0404 0,610 Wire 2 0.0195 ? 0.0105 (r) (in) 0.0193 Length(in) 0.0114 0.0136 (lbs) (lbs/in³) ? 0.324 4.42E-4 0.698 The volume of a cylindrical piece of wire can be approximated using V = pi r² L What is the density of Wire 2 in kg/mL? See the next few questions below to help answer this question! Metal Cu-Copper Unknown

5. Perform the following unit conversions. Show the setups for each conversion (cancel units). Give your answers to the correct number of significant figures. a) 275 yd to m b) 0.0053 gall to L c) 5.788 x 108 µg to lb d) 355 m/s to miles/hr

Accurate? Precise? Density= Measurement, Significant Figures, Rounding, Precision and Accuracy 1. How many significant figures in each of the following measurements? 3.121 m 4 2 1.4 X 104g. 2 0.051 L 120 ft 2. Round the following numbers to 3 significant figures. 2.35500 23 9.385 9.59 2 Group A 12.348 g 12.441 g 12.367 g 12.392 g 3. Solve the following and express the answer in the correct number of significant figures. a. The average mass of 3 objects whose individual masses are 10.3 g, 9.334 g, 9.25 g. 10.39 + 9.334 + 9.25 +3= 28.8849, or 28.9 b. The volume of a metal block whose dimensions are 2.44 cm by 4.2 cm by 3.571 cm. 2.44 4.2.3.54= 36.60 Group B 12.412 g 12.420 g 12.418 g 12.415 g 0.0150 L 3 3 200. K c. Carry out the following operations and express your answer in the correct number of significant figures. (12.8+ 12.71)/0.560 = 45.55 155./(43.25-7.1) = 4,288 4. Four groups of students where charged with measuring the mass of 10.0 mL of a solution of sugar water and from there…