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3. Using a balance, find the mass of each piece of aluminum foil' Recordthe masses in Table 1. Again, be careful to be as precise as possible. Askyour instructor if you are unsune of the precision to which yourbalance can be read'

REAGENT DISPOSAL

Place the used aluminum foil in the wastepaper basket'

POST LAB DISCUSSION

Accuracy is the closeness of an experimental value to an accepted value.

For example, if you wene measuring the length of a 100 m track' theacceptedvaluewouldbe 100 m. Ifyourmeasul€mentwas close to 100.0 m,

then your measunement would be considered to be accurate. Precision is

the cioseness of your repeated measunements to each other' Using thesame example, ifyou measured the track three times and each time foundthe length io be 9s.6 m, your measunements would be precise' but notaccurate.

In ttris experiment, the accepted values for the thickness might be

available on the aluminum foil packages, or your instructor might have

determined what (s)he believes are the accepted values. The closeness tothese accepted values will determine the accuracy ofyour measul€ments'If you do two or three trials with the same gpe of aluminum foil' you candetermine the precision of your measurements'

Exponential notation is used in the calculations because of the magni-tude of the thickness measurements. whenever very large or very smallnumbers are encountered in scientific work, it is best to express thosenumbers in exPonential notation.

DATA AND OBSERVATIONS

Tatrle I

SUESTIONS AN D CALCULATIONSl-. For each of the pieces of aluminum foil, you will need to calculate the following:

Area (A)

Volume (V)

Thickness (T)

a.

b.c.

2.

Refer to the beginning of this experiment for the formulas to be used. The density of aluminumis2.ZO g/crrrz.Strowaiofyourworkandresults.Youranswersshouldhavethecorrectnumberof significant figures and be expnessed in exponential notation, where appropriate'

Compare your answers with those of other students or'aluminum foil. How do your answers compare? Can youurements are? (WtrY orwhY not?)

ExPeriment 3A

if available, look at the box from thedetermine howaccurate Your meas-

SHEET NO. TYPE LENGTH (cm) $TIDTH (cm) MASS (g)

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