(2.19) Determining the Density of 3 Unknown Alloys

Directions: In the table below are 9 solid objects that look and feel like they’re made of the same material. They are not. There are 3 different metal alloys: Jasonicium (Density = 4.8 g/cm3), Paulaboly (Density = 5.4 g/cm3) and Murrayury (Density = 6.2 g/cm3). All 3 of these new metal alloys were named after the genius’s that developed them. Two other alloys, Vincenebeany & Geardiardy, that have been recently developed, were not included here, due to time constraints. Your challenge; to identify what alloy each object is made of. Use the table provided on the next page to show all of your calculations. LABEL every number.

Some Physical Properties of 9 Solid Objects
Object A / Object B / Object C
Mass: 47.8 g / Mass: 58.1 g / Mass: 22.5 g
H2O Displacement: 10.0 ml / H2O Displacement: 10.8 ml / H2O Displacement: 4.7 ml
Object D / Object E / Object F
Mass: 32.7 g / Mass: 101.8 g / Mass: 60.7 g
1.2 cm x 1.2 cm x 3.7 cm / H2O Displacement: 18.9 ml / Radius: .9 cm, L: 5.0 cm
Object G / Object H / Object I
Mass: 80.2 g / Mass: 65.6 g / Mass: 24.7 g
H2O Displacement: 12.9 ml / 4.1 cm x 1.6 cm x 1.6 cm / Volume: 4.6 cm3
Show ALL Calculations: LABEL EVERY NUMBER!
Calculate to the hundredth place (.00)
Object A / Object B / Object C
Density = / Density = / Density =
Object D / Object E / Object F
Density = / Density = / Density =
Object G / Object H / Object I
Density = / Density = / Density =

Have you figured out what is what yet? You should of. Remember, density is a physical property of matter. Just like color, texture, length, weight, mass, viscosity, hardness, fat, skinny, tall, short, conductivity, malleability, ugly, pretty, big nose, small nose, blonde, brunet; need I go on? Density is just one way you can describe and identify all of the stuff that exists in the world.

Directions:

  1. Construct a graph showing the mass (Y axis) versus the volume (X axis). Use a straight best fit line to connect the points. Make sure you label everything properly.
  1. Use the information in the above table to complete the table on the next page. Sketch each object to scale in the big box.
  1. Answer the questions on the last page.

The Density of 9 Solid Objects
More
Mass / Less Dense More Dense / More
Vol.
Alloy = / Alloy = / Alloy =
/ Object = / Object = / Object = /
Density = / Density = / Density =
Object = / Object = / Object =
Density = / Density = / Density =
Object = / Object = / Object =
Density = / Density = / Density =

Questions:

  1. Does the shape of an object have anything to do with density? Explain.
  1. Does the size or amount of an object affect its density?
  1. Why was the volume of some of the objects measured by water displacement?
  1. Would any of the objects float in water? Explain.
  1. Would any of the objects sink in water? Explain.
  1. Look at your graph, why are all of the lines straight?
  1. Pick a random point on each line and calculate that objects density using the concept of slope. (Rise over Run) Show all work below.
  1. Compare your answers above to the densities you calculated earlier. Why are they close or not close?