Laboratory Techniques and Measurements

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Name: Kensley Shelley|Date: 9-17-12|
Exp 2: Laboratory Techniques & Measurements|Lab Section: 0000|

Data Tables:

Step 1: Length and Measurements

Object Measured|Length in cm|Length in mm|
Key|5.15 cm|51.5 mm|
CD|12.0 cm|120.0 mm|
Spoon|18.05 cm
16.30 cm|180.5 mm
163.0 mm|

Step 2: Warm Temperature Measurements

Hot tap water temperature49.50_˚C
Boiling water temperature __immediately:104.5; after 5 minutes: 103.0__˚C

Step 3: Cold Temperature Measurements

Cold tap water temperature_24.5_˚C
Ice water temperature after 1 min:4.5, after 5 min:1.0 ˚C

Step 4: Volume Measurements

Volume of half filled graduated cylinder__12.5__mL
Volume of completely filled small test tube __n/a__mL
Number of drops in 1 mL___14_drops
Volume of the micro pipet __28__ drops_2___mL

Step 6: Density Measurements
Part A
Mass of empty graduated cylinder_16.9_g
Mass of graduated cylinder and water 21.1_g
Net mass of the water __4.2_g
Density of the water_0.84_ g/mL

Part B
Mass of graduated cylinder and alcohol _20.4_g
Net mass of the alcohol __3.5_g
Density of the alcohol__0.7__ g/mL

Part C
Mass of graduated cylinder and salt solution ____g
Net mass of the salt solution____g
Density of the salt solution____ g/mL

Part D
Volume of half filled graduated cylinder__8.0__mL
Volume of half filled graduated cylinder and metal bolt_9.1__mL Volume of the metal bolt_1.1_mL
Mass of the metal bolt __7.2__g
Density of the metal bolt__6.55__g/mL

Part E
Mass of half filled beaker__89.0__g
Mass of water displaced by metal bolt__90.1__g
Volume of the metal bolt__1.1__cc
Density of the metal bolt__6.55__g/cc

Mass of half filled beaker__89.0__g
Mass of water displaced by magnet__89.8__g
Volume of the magnet _0.8_cc Mass of the magnet __4.0_g Mass when dropping the magnet in the beaker__92.9__g

Density of the magnet__5.00__g/cc

Calculated volume of the magnet using dimensions
of length x width x height__0.78__cc
Density of magnet using the calculated volume_5.13___g/cc


Questions and Problems:

A. Which method of determining density is more accurate, the water displacement method in Part D or Archimedes’ principle method in Part E? Why? For the metal bolt, I received the same answer for both experiments, so I would say both were equally accurate in my experiment.

B. What is the relationship between mL and cm3?
They equal each other; mL = cc

C. Everyone knows that water is supposed to boil at 100° C. Why did your water sample boil at a different temperature? Water boils at different temperatures depending on the altitude. The higher pressure in the air keeps the molecules from escaping as easily.

D. 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? 64.86 kg
2. What weighs approximately 1 g?
dollar bill, paper clip
3. What is approximately 1 cm long, wide or thick?
fingernail is 1 cm wide
4. What weighs about 100 g?
20 nickels, 40 pennies
5. What weighs about 1000 g?
1 liter of water


The experiment was designed to help acquaint the student with proper laboratory measurements and techniques. This was done by allowing the student to use the different lab tools in a variety of ways, such as: heating, measurements, volume, and density. In completing this lab, I am better aware of the different tools which will be used and how to properly use...
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