Density by Water Displacement



Name______________Density LabPart 1: Density of metalsProcedure:Obtain a small graduated cylinder.Fill the graduated cylinder approximately half full. Record the volume in the chart below for the initial volume of water. *Remember to round to the appropriate significant figures!! (either 3 or 4)Obtain a piece of aluminum and measure its mass using an electronic balance.Record the mass below in the column Mass of Metal.Gently lower the metal piece into the graduated cylinder and determine the final volume of water. **The volume of metal can be determined by the Displacement Method. It is the difference between the final and initial volume of water.REPEAT THE PROCEDURE WITH TWO DIFFERENT PIECES OF THE SAME TYPE OF METAL.Repeat the whole procedure for the other two types of metal.AluminumMass (g)Initial volume of water (ml)Volume of Water and Metal (ml)Volume of Metal (ml)Density of Aluminum(g/ml)CopperMass (g)Initial volume of water (ml)Volume of Water and Metal (ml)Volume of Metal (ml)Density of Copper(g/ml)ZincMass (g)Initial volume of water (ml)Volume of Water and Metal (ml)Volume of Metal (ml)Density of Zinc(g/ml)How do the three measured values for the density of Aluminum compare?How do the three measured values for the density of Copper compare?How do the three measured values for the density of Zinc compare?What conclusion can be drawn about the density of an individual type of metal?Part 2: Finding the Density of WaterUse a 50-ml cylinder, scale, and calculatorComplete the following chartRemember to read the cylinder to the bottom of the meniscus(The meniscus is the lens of water with a glass cylinder) Experimental Data:Mass of empty cylinder (g)Mass of cylinder plus water (g)Mass ofWater* (g)Volume of water (ml)**5 ml10 ml15 ml20 ml25 ml30 ml35 ml40 ml45 ml50 mlAnalysis of Data:1) Open LoggerPro 3.x and Graph Mass of Water in grams (g)* on the Y-axis against Volume of Water in milliliters (ml) on the X-axis** using your experimental data. 2) What type of function best fits the data? (Linear, pos curve, Inverse curve).3) The slope of a line is “rise over run”.a) What is being measured by the rise?b) What is being measured by the run?c) What is being measured by the slope rise/run?5) Create a calculated column in LoggerPro called Density. In the Formula spot put “mass”/”volume”.6) Display both (Density vs. mass) and (Volume vs. mass) on the same graph.7) 7) Print a copy of the graph for each person in your group.Density of PenniesProcedures:Obtain ten pennies that were minted earlier than 1982 and record their mass (all together). *See the back side for chart*Fill a 100 mL graduated cylinder partially with water and record the initial volume with the appropriate significant figures.Place ALL 10 pennies into the graduated cylinder and record the new volume.Repeat the procedure using 10 pennies minted AFTER 1982.Record the masses and volumes in the chart below.1837-1981 Pennies1982 - PenniesMass of 10 Pennies (g)Average Mass of 1 PennyInitial Volume of Water (mL)Final Volume of Water (mL)Volume of All 10 PenniesAverage Volume of 1 Penny (mL)Average Density of 1 Penny (g/mL)AnalysisIs there a significant difference between the densities of older and newer pennies? Is there a difference between their volumes?Compare the densities of the pennies to the densities in the table below.Known Metal DensitiesMetalDensity (g/mL)MetalDensity (g/mL)Aluminum2.6Silver10.5Zinc7.1Copper8.9Gold19.3Steel7.7Stainless Steel8.0Titanium4.5Lead11.4Brass8.6 According to density, what metal are the older pennies likely made of?What metal are the newer pennies likely made of?Why were 10 pennies used in part 2 instead of just one penny?Perhaps a graduated cylinder was not available for this experiment. What other method(s) might be used to determine the density of a penny?Which method would give the most accurate results and why? ................
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