CHM 1025C Experiment #3 Measurement Data Sheet

Name: __________________   Section: ____________ Instructor_______________

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   =   ___________________%

Volume from Length:

Object: _________________________(description)

Length: __________cm       Width: __________cm    Height: ___________cm

Volume = length x width x height.                   V =  _______ cm3

Length: __________in         Width: __________in     Height: ___________in

Volume = length x width x height.                   V =  = ________ in3

Calculation:    _____________ cm3 = 1.000  in3

The correct value is 16.48 cm3 = 1.000 in3

Deviation:  ____________ cm3                   % Error =  ____________%

Mass (Large object-beyond capacity of top loader)

Capacity of Triple Bean Balance: _______________g

Mass of Object =   __________g (triple beam) (Car keys-cell phone)

Mass of Object =  __________oz (some ounce measuring device, if available)

__________g = 1.00 oz    (The true value is 1 oz. = 28.35 g. )

Calculate the deviation and percent error.

Mass (Smaller object within capacity of Deak Top Loader)

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

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

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

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

Total Mass:    __________________g           Total Mass:        ____________________g

Average pre1980:   ______________g           Average post 1980: _________________g

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Finding the True Value:

If available from your instructor, find the mass of a pre 1962 penny (Wheat penny) and a 1943 penny (Zinc Penny) using four different balances:

Balance                    Wheat Penny             Zinc Penny

Triple Beam                 ____________g          ____________g

(only one in the lab at the front desk)

Analytical Balance     ____________g           ____________g

(only one in the lab at the front desk)

Discussion: Precision vs Accuracy vs Uncertainty:

Volume:

_________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

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

2nd Measurement: _________mL

3rd Measurement: _________mL

Average: _________mL

Calculation:

___________mL = 1 ounce

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

___________mL = 1 ounce

___________% error

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Discussion: Precision versus Accuracy of Length and Mass Above:

Count (Optional)

Your instructor will give you the Data Page for the Bean Jar Experiment, if time permits