Lab Techniques and Measurements
Lab Techniques and Measurement
Adam Cristman
07/05/12
Garage workbench
DPP-340 Chemistry
Abstract
Experiment and Observation
Length measurement of 3 objects
Object
Length (cm)
Length (mm)
Swiss army knife
iphone with case
118.0
galvanized nail
Temperature measurement
Hot water from tap (ÂșC)
Boiling water (ÂșC)
Boiling water – 5 minute (ÂșC)
48.0 ÂșC
101.5 ÂșC
67.7 ÂșC
Cold water from tap (ÂșC)
Ice water (ÂșC)
Ice water – 5 minutes (ÂșC)
23.6 ÂșC
4.4 ÂșC
2.7 ÂșC
Volume measurement
Test tube Volume (mL)
Number of drops in 1mL
Pipet volume (mL)
10.1 mL
22 drops
4.25 mL
Mass measurement
Object
Estimated Mass (g)
Actual Mass (g)
small washer
2.0 g
key Chain
12.4 g
outlet cover
0.25 g
1.8 g
screw
0.5 g
0.9 g
iphone with cover
250 g
161.6 g
lighter
21.3 g
swiss army knife
250 g
124.3 g
Did your hypotheses become more accurate with practice?
On certain objects yes, but other objects based on their shape and feel sometimes led me to believe they were heavier or lighter than they actually were.
Density measurements
Mass A
Mass B
Mass A -B
Object
Graduated Cylinder + Substance
Graduated Cylinder 16.7 g
Substance
Substance Volume
Density
Water
21.7 g
16.7 g
1 g/mL
Isopropyl
alcohol
21.0 g
16.7 g
4.3 g
0.86 g/mL
Saturated salt solution
22.5 g
16.7 g
5.8 g
1.16 g/mL
Develop a hypothesis as to whether the density of the salt solution should be greater or less then the density of pure