CHM 1025C/1032C Experiment #2 Measurement Data Sheet

Name: __________________ Section: ____________ Instructor_______________

Mass (or other similar objects) (use the top loader Balances):

1^st pre1980 penny: _____________g 1^st post 1980 Penny: ________________g

2^nd pre 1980 penny: _____________g 2^nd post 1980 Penny: ________________g

3^rd pre 1980 Penny: _____________g 3^rd post 1980 Penny: ________________g

Total Mass: __________________g Total Mass: ____________________g

Average pre1980: ______________g Average post 1980: _________________g

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Length: (You may work in pairs)

With Meter Stick:

Person#1

Height in Inches: _____________in Height in Centimeters: _______________cm

Person#2

Height in Inches: _____________in Height in Centimeters: _______________cm

Calculation:

#1:___________cm = 1 inch #2:___________cm = 1 inch (two meter)

Accepted Value: 2.5356 cm = 1 in

#1 Deviation from Correct: __________ cm #2 Deviation from Correct: _________cm

% Error : Deviation/Accepted Value X 100 = #1___________% #2__________%

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With Two Meter Stick:

Height in Inches: _____________in Height in Centimeters: _______________cm

Calculation:

___________cm = 1 inch Accepted Value: 2.5356 cm = 1 in

Deviation from Correct: __________ cm

% Error : Deviation/Accepted Value X 100 = ___________________%

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Discussion: Precision versus Accuracy of Length and Mass Above:

Experiment #2 Page 2

Volume:

10 mL Graduated Cylinder:

_________drops = 1 mL

_________drops = 5 mL Calculate: _____drops = 1 mL ( # in 5/5)

_________drops = 10 mL Calculate: _____drop = 1 mL (# in 10/10)

Accepted Value : 20 drops = 1 mL

Discussion: Was their variation between three above measurements?

What can you say about accuracy versus precision?

250 or 500 mL Cylinder

1^st Measurement: _________mL = 16/20 oz water bottle (Fill to the marked line)

2^nd Measurement: _________mL

3^rd Measurement: _________mL

Average: _________mL

Calculation:

___________mL = 1 ounce

Accepted value Calculation (946 mL = 1 qt ; 32 oz = 1 qt)

___________mL = 1 ounce

___________% error

Comments about Precision & Accuracy: