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27 Οκτ 2013 (πριν από 3 χρόνια και 9 μήνες)

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Thermodynamics:

Density Unknowns

10 pts


Name _________
_________
__


Introduction and Purpose:

According to Archimedes’ Principle, we should be able to
distinguish between unknown objects of known volume and mass by determining the
density of each one.
Volume of the density cube = 16.4 cm
3


Procedure:

Weigh each of the numbered cubes, recording the mass to the greatest
accuracy possible. Enter the data
for mass only

on the board so that not every pair
has to weigh each one. Use the formula for calculatin
g density and the chart of
densities to propose the material each cube is made of.


(
2
)
Data

and observations
:

Cube
#

Mass in g

Density
in
g/cm3

Observations that may
help identify the substance


Proposed identity
based on Density


1





2





3





4





5





6





7





8






(5
)
Calculations

(show all steps for FOUR sets)
: Dens
ity = mass / volume

D = M / V










(2) What

pairs or sets of materials

are the most difficult to identify using density

ALONE
, and
why
.




(1)
T
he materials that should
sink

in water include ____________________________ and those
that should
float

in water include ______________________________________ .