3. Evaluate your predicted densities of liquids A and B in ACTIVITY 3 based on their percent differences from those valu

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3. Evaluate your predicted densities of liquids A and B in ACTIVITY 3 based on their percent differences from those values you found experimentally. Consider less than 2% to be excellent agreement, less than 5% to be very good agreement, and less than 10% to be good agreement LD 10 Fluids 175
Table 10.2: Liquid A. Mass of the beaker: 0.245 kg m W=mg W'= m'g (N) Sample F=W-W' (N) Wi= mg (N) % diff. (kg) (N) (kg) 1 0.314 10.0878/0.860 0.05570,546. 10,2721/2,67 0,1727 1.69 0.300 +4167 0.951 2 0.98 +3.05 Table 10.3: Liquid B. m (kg) % diff. Sample W = mg (N) m' (kg) W'=m'g (N) F=W-W' (N) W=mg (N) 1 0.08780.860 bolal 0.609 0251 b2721 2.67 0.1925 1.887 0.783 10.232 +8.19 0.757 13:43 2
ACTIVITY 3: DENSITY OF LIQUIDS You will use Equation 6 to predict the value of the densities of liquids A and B and Equation 1 to calculate these densities experimentally. MATERIALS Laboratory balance . Graduated cylinder Liquid samples (A and B) PREDICTION Use your results from Tables 10.1, 10.2 and 10.3 and Equation 6 to calculate the densities of liquids A and B. Use the metal-sample densities you found experimentally. Show your calculations below Table 10.4 on the LAB REPORT. EXPERIMENTAL VERIFICATION Record the following measurements in Table 10.4. 1. Measure the mass of the graduated cylinder and record this value. 2. Pour liquid A into the graduated cylinder and measure its volume (V.). 3. Measure the combined mass of the graduated cylinder and liquid A and calculate the mass of liquid A (m.). 4. Calculate the density of the liquid (p.). Compare your result with the predicted value and calculate the percent difference between these values. 5. Repeat the same procedure for liquid B. 6. Answer QUESTIONS 3, 4, and 5.
When an object is placed in a fluid, it will float or sink depending on the relative magnitudes of its weight and the buoyant force acting on it. This can be shown as follows. The weight of any object whose mass is m, is given by W. = meg = p. Ves Equation 5 where V, is the volume of the object and p its density If the object is completely submerged in the fluid, then Vo = V. Dividing Equation 4 by Equation 5 yields F w PE Po Equation 6 Equation 6 will be used in ACTIVITY 3. Solving Equation 6 for F, one obtains 5- (A) PE Po Wo Equation 7 You can use Equation 7 to draw the following conclusions concerning the conditions that must exist for an object to float, sink, or float completely immersed in a fluid: 1. If po <Pr, then Fg > W., and the object will rise to the surface until it floats. 2. If po> Pr, then F, <W., and the object will sink. 3. If po = Pc, then Fn = W, and the object will float completely immersed in the fluid.