Density And Significant Figures Lab

Eamon Barkhordarian 5/17/09

Density and Significant Figures Lab Purpose: 1. To practice proper techniques in making and recording measurements 2. To use significant figures in calculating the derived value density Materials: – – – –

Density Samples Metric Ruler Graduated Cylinder Balance

–

Conduct lab procedure in a mature and safe manner

Safety:

Procedure: Sample #

Physical Description

Length (cm)

Width (cm)

Height (cm)

Volume (cm3 or mL)

Mass (g)

Density (g/cm3 or g/mL)

1

Cone Tip

X

X

X

0.6 mL

7.80

13 g/mL

2

Blue Ball

X

X

X

1.1 mL

1.85

1.68 g/mL

3

Gold Cube

0.9

0.95

0.975

0.83 cm3

7.36

8.87 g/mL

4

Silver Cube

0.9

0.9

0.9

0.73 cm3

2.44

3.34 g/cm3

5

Wood Cube

1.0

1.0

1.0

1.0 cm3

0.47

0.47 g/cm3

6

Black Cube

1.1

0.8

1.1

0.96 cm3

1.49

1.55 g/cm3

7

Cork

2.0

1.55

0.6

1.86 cm3

0.55

0.30 g/cm3

8

Clear Cylinder

X

X

0.9

0.02 cm3

1.30

1.27 g/cm3

Eamon Barkhordarian 5/17/09

Calculations:

Eamon Barkhordarian 5/17/09

6. The density of 10 mL of water is 0.89 g/mL. Analysis: 1. From greatest to least dense: Cone tip

Gold Cube

Silver Cube

Blue Ball

Black

Cube Clear Cylinder Wood Cube Cork. In this experiment we only worked with solids. I believe that the density of solids and liquids tend to be the same. There will be some solids that denser and some liquids that are denser. Conclusion: 1.

2. Experiments show that the volume of most substances increases as the temperature

increases. Meanwhile, the mass remains the same despite the temperature and volume changes. Because density is mass divided by volume, the density of a substance generally decreases as its temperature decreases. 3. Density is a physical property. A physical property can be observed, measured, or changed without changing the makeup of a substance. This is one method chemists use to classify different items. The density does not change as size changes, unless one piece of a substance has undergone a change which the other pieces have not undergone, the densities of pieces of different sizes will all be the same. 4.