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# Laboratory Techniques & Measurements Essay

Exp 2: Laboratory Techniques & Measurements|Lab Section: |

Data Tables:

Length Measurements

Object Measured|Length in cm|Length in mm|Length in m|
IPhone 5||||
House Key|5.0|50|0.050|
Body Mist Bottle|6.9|69|0.069|

Warm Temperature Measurements

Hot tap water temperature__48_˚C _118.3_˚F __321__K
Boiling water temperature at 5 min____˚C____˚F ____K

Cold Temperature Measurements

Cold tap water temperature____˚C____˚F ____K
Ice water temperature at 5 minutes____˚C____˚F ____K

Mass Measurements

Object Measured|Mass in g|Mass in kg|
|||
|||
|||

Volume Measurements and Density Measurements with liquids

Water:
Volume of water in graduated cylinder____mL
Mass of graduated cylinder and water ____g
Net mass of the water ____g
Density of the water____ g/mL
Percent error____%

Alcohol:
Volume of alcohol in graduated cylinder____mL
Mass of graduated cylinder and alcohol ____g
Net mass of the alcohol ____g
Density of the alcohol____ g/mL
Percent error____%

Volume Measurements and Density Measurements with solids

Mass of magnet ____g
Length of magnet ____cm
Width of magnet____ cm
Height of magnet ____cm
Calculated Volume of magnet ____cc
Density of the magnet____ g/cc

Water Displacement and Density Measurements

Magnet:
Mass of magnet ____g
Volume of water in graduated cylinder____mL
Volume of water and magnet in graduated cylinder____mL
Volume of magnet (subtract the two volumes)____mL
Density of the magnet____ g/mL

Bolt:
Mass of bolt ____g
Volume of water in graduated cylinder____mL
Volume of water and bolt in graduated cylinder____mL
Volume of bolt (subtract the two volumes)____mL
Density of the bolt____ g/mL

Archimedes’ Method
Bolt:
Mass of bolt ____g
Mass of Displaced Water ____g
Calculated Volume of Displaced Water ____mL
Density of the bolt____ g/mL

Magnet:
Mass of magnet ____g
Mass of Displaced Water ____g
Calculated Volume of Displaced Water ____mL
Density of the magnet____ g/mL

Density of Sugar Solution

Net mass of the original sugar solution____g
Volume of the original sugar solution____mL
Density of the original sugar solution____ g/mL

Net mass of the diluted sugar solution____g
Volume of the diluted sugar solution____mL
Density of the diluted sugar solution____ g/mL

Conclusion:

Questions and Problems:

A. Which method of determining density is more accurate, the water displacement method or Archimedes’ principle method? Why?

B. What is the relationship between mL and cm3 (cc stands for cubic centimeters)?

C. To help you get a feel for metric measurements, you need to know the relative magnitude of a few basic measurements. For example: 1 mm = thickness of a dime, a penny weighs 2 ½ grams, and 20°C = normal room temperature. Determine the following:

1. What is the mass in kilograms (kg) of a person who weighs 143 lb?

2. What weighs approximately 1 g?

3. What is approximately 1 cm long, wide or thick?

4. What weighs about 100 g?

D. An object has a density of 11.3 g/cm3. If it weighs 7.0 g and you added it to a graduated cylinder with 5.0 mL of water, what will be the new volume of water in the cylinder after the object is added?

E. If you were to dilute the sugar solution one more time, would the density of the solution increase or decrease?

F. Is the dissolving of a sugar in water to form a solution a chemical change or physical change?

Essay Topics:

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