Labpaq Lab Techniques and Measurements Essay

1512 Words Mar 13th, 2013 7 Pages
Title: Observations of Chemical Changes
Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.
Procedure: Measure the volume, mass, length and temperature of a variety of items. Create dilution of sugar water.

Data Tables and Observation: Fill out the data sheet (below) for the experiment and submit with this form. Recording data carefully
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Measure the mass and calculate the density of the magnet using the correct significant figures and units. Show work for full credit. (2 points)

2x0.8x0.8=1.28 mL=cubic centimeters
4.3 g/1.28 mL= 3.36 g/mL

(0.5 point)
Data Table 6: Displacement Method
Object:
Mass (g)
Initial volume in the graduated cylinder (mL)
Final volume in the graduated cylinder (mL)
Object Volume (mL)
Density (g/mL)
Magnet

4.3 g
7.0 mL
8.0 mL
1.0 mL
4.3 g/mL
Metal Bolt
8.0 g
7.0 mL
8.0 mL
1.0 mL
8.0 g/mL

Determine the volume of the magnet and metal bolt to +/- 0.1 mL using units and sig figs carefully. Measure the mass and calculate the density of the magnet and metal bolt using the correct significant figures and units. Show work for full credit. (2 points)

8.0-7.0=1.0

because each of the objects displaced the water by 1 mL, their mass over that mL is their density.

Magnet= 4.3 g/mL
Bolt= 8.0 g/mL

(0.5 point)
Data Table 7: Archimedes Method
Object:
Mass (g)
Mass of displaced water (g)
Volume of displaced water (mL)
Density (g/mL)
Magnet

123.0 g
124.0 g
7.5 mL

Metal