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):

Capacity of Desk Top Loading Balance: _______________g

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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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

Top Loader (0.01g) ____________g ____________g

Top Loader (0.001g) ____________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:

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:

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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