I need help on number 5. Here is the whole experiment.

volod of EXPERIMENT 4 DENSITY Density, I, is the relationship of an object's mass, m, to its volume, V. r = m We remember that mass is the measure of the quantity of matter that an object contains, and volume is the amount of space occupied by an object. In this experiment, we will relate the mass and volume to the density of an object. OBJECTIVE To identify an unknown substance by determining its density, the ratio of its mass to its volume. . EQUIPMENT Ioval to unknown substance (aluminum, brass, copper, steel) graduated cylinder balance PROCEDURE Measurement of mass 1. Set the balance to read zero. woled aldi erdt oini emulov mi sonsoflib shi bas acet sgarovr, od oruni-due . 2. Place the unknown substance on the balance and measure its mass. vd mumm on gibivib vd viensb off setupled .SI 3. Record this mass measurement in the following table. Surged of Imie novaos of ansilgillum fiau sat .81 MASS Ou , mo I or molaviups of lon Trial Mass, g ORDISVA #2 #3 59 9 nwordmus sdi vilinebi of isbio ai Torfobet Average 40:3910 Is of vliensb bomluolso eidl sisqmod .et nolai inonineq ark brood . soncindua 4. Repeat Steps 1, 2, and 3 two more times. 5. Calculate the average mass of the substance and record it in the table. joinin 12sad Measurement of volume sonniedue 6. Fill the graduated cylinder 2/3 full with water. due way to nobisogmos orli vinev of radoset woy rhiw wood PHYSICS LABORATORY EXPERIMENTSDENSITY NT 4 7. Read the initial water level. One of the units for volume in the metric system is the milliliter, abbreviated ml. The milliliter is regularly used when measuring small volumes. To measure larger quantities, we use the liter, abbreviated L. There are 1000 ml in 1 L. Record the initial water level in the table below. NOTE Be sure to read the water level at the lowest point of the meniscus. Meniscus I - - 8. Slightly tilt the graduated cylinder and gently allow the substance to slide down the interior edge of the graduated cylinder until it reaches the bottom. NOTE We tilt the cylinder so that the substance can slide down rather than drop to the bottom and cause the cylinder to break. 9. Place the graduated cylinder on a flat surface and read the final water level. Record it in the table below. DO 10. Calculate the difference in water levels, and record it in the table below. This is the volume displaced by the substance. VOLUME ThaMqIUOH Water level Volume, ml Initial 50 ml sondied Final 52 ml Difference Determination of density 11. Substitute the average mass and the difference in volume into the table below. 12. Calculate the density by dividing the mass by the volume. resem bas sousted arb no gonedue mumtru lyat (00che) 13. Use unit multipliers to convert g/ml to kg/m3. 1 kq oldsi gaiwollot 30 8 HINT 1 ml is equivalent to 1 cm', so 1 g/ml = 1 g/cm3. DENSITY Average Difference in mass, g volume, ml Density, ml Density, 3 40, 39 2ml 30 9mi | 30, 000 / 3 14. Compare this calculated density to a table of densities provided by the teacher in order to identify the unknown substance. Record the pertinent information below. Calculated density 30,000 kg/m' om ovi's & bus . s, 1 29012 masqost + Best matched density 30,00 0 n kg/m3 fr 10 2zem ggunisys oil olslugla!) .e Substance Stainless Steel Necklacesjov to ismoreDoM 15. Check with your teacher to verify the composition of your substance. dilw llul &\\S isbailyo boisuberg orb lit .0 PHYSICS LABORATORY EXPERIMENTS 80EXPERIMENT 4 ECTRIC PO ANALYSIS AME: 1. List some reasons why your experimental density may differ from the currently accepted density value. One reason could be the accuracy of measurement pertaing to the instrument used . Another reason when experimenting with liquid is taking the substance in and out of the liquid could result in ligned lossed. Elec 2. How would repeating this experiment numerous times increase the accuracy of the calculated density ? energy. So Repeating the experiment multiple times results in in space he light bulbs precision due to getting around the same number if not amount of the exact number or result . 3. Why would this procedure not work well in determining densities of very light objects? Since cu A object with a light color results in having a less density than a dark color object . The reason dark color object Using C have more density is because it's saturation or attribute of value are high 4. How would you calculate the density of an object which would not be totally submerged in the water? OBJE I would use this formilla : Fe = M displacement water xq = ( p water . V water displaced) x q P = V -> m=p . v. EQU AAblack Fivet = m. a = Fg- FB : m. M blockx = Pwater x V w displac x o/= Pwater XVwater ofdisplacement 5. Explain why this method cannot be used to identify the components of a substance composed of two or more different materials. PR Ca 195 PHYSICS LABORATORY EXPERIMENTS 81