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 9.0 90.0

iphone with case 11.8 118.0

galvanized nail 8.8 88.0

Temperature measurement

Hot water from tap (ºC) Boiling water (ºC) Boiling water - 5 minute (ºC)

48.0 ºC 101.5 ºC 67.7 ºC

Cold water from tap (ºC) Ice water (ºC) Ice water - 5 minutes (ºC)

23.6 ºC 4.4 ºC 2.7 ºC

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 1 g 2.0 g

key Chain 4 g 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 5 g 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

M/V

Water 21.7 g 16.7 g 5 g 5 mL 1 g/mL

Isopropyl

alcohol 21.0 g 16.7 g 4.3 g 5 mL 0.86 g/mL

Saturated salt solution 22.5 g 16.7 g 5.8 g 5 mL 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