Question

Analysis and Questions showa setup for each problem When reading a ruler, the precision is good to about +/-0.05 cm. Suppose you read the diameter of the sphere (part 2) as 1.20 instead of the correct 1.15 cm. What would the % error be in the calculated volume ? 1. 2. If you have a grad cylinder which weighed 78.35 g when empty, and you filled it to the 26.5 mL mark with carbon tetrachloride (CCl4 (liq)), with a density of 1.61 g/mL, calculate the mass of the cylinder with the liquid. 3. Compare the density calculations of water in part 3 and 4. In which device, the pipet or buret do you have a greater confidence in giving consistent and accurate results? Explain, based on your results. 4. a) What was the room temperature when you read it on the thermometer. Calculate the temperature in Fahrenheit and Kelvin. °C b) At what temperature will the Fahrenheit and Celsius reading be the same ? (hint it's below 0 on both scales).

Answer 1

Ans 1

If dia of sphere D1 = 1.20 cm

Volume of sphere V1 = (4/3)*3.14*(D1/2)^3

= (4/3)*3.14*(1.20/2)^3

= 0.904 cm3

Correct dia D2 = 1.15 cm

Volume of sphere V2 = (4/3)*3.14*(D2/2)^3

= (4/3)*3.14*(1.15/2)^3

= 0.7959 cm3

% error = (V1 - V2)*100/V2

= (0.904 - 0.7959)*100/0.7959

= 13.58%