The densities are given at 20 °C: water, 0.998 g / c m 3 ; iron, 7.86 g / c m 3 ; aluminum, 2.70 g / c m 3 . Arrange the following items interms of increasing mass. a. a rectangularbarof iron, 81.5 c m × 2.1 c m × 1.6 c m b. a sheet of aluminum foil, 12.12 m × 3.62 m × 0.003 c m c. 4.051 Lofwater
The densities are given at 20 °C: water, 0.998 g / c m 3 ; iron, 7.86 g / c m 3 ; aluminum, 2.70 g / c m 3 . Arrange the following items interms of increasing mass. a. a rectangularbarof iron, 81.5 c m × 2.1 c m × 1.6 c m b. a sheet of aluminum foil, 12.12 m × 3.62 m × 0.003 c m c. 4.051 Lofwater
The densities are given at 20 °C: water,
0.998
g
/
c
m
3
; iron,
7.86
g
/
c
m
3
; aluminum,
2.70
g
/
c
m
3
. Arrange the following items interms of increasing mass. a. a rectangularbarof iron,
81.5
c
m
×
2.1
c
m
×
1.6
c
m
b. a sheet of aluminum foil,
12.12
m
×
3.62
m
×
0.003
c
m
c. 4.051 Lofwater
III. Perform these calculations and express the result with the proper number of
significant figures.
a. (4.850 g – 2.34 g)/1.3 mL
b. (4.66 x 10-3) × 4.666
c. 0.003400/65.2
Bud N. Chemist must determine the density of a mineral sample. His five trials yield densities of 5.15 g/cm3, 4.83 g/cm3, 5.08 g/cm3, 4.97 g/cm3, 5.12 g/cm3. Independent studies found the correct density to be 5.06 g/cm3. Which of the following is incorrect?
a. The mean of his analysis is 5.03 g/cm3 indicating an error of 0.03 g/cm3 from the correct density
B.His data has a standard deviation of 0.017 g/cm3
C.His data has a relative standard deviation of 2.60%
D. He can report his analyzed density as 5.0±0.2 g/cm3 at a 95% confidence level
E. The true value (population mean) is found within the confidence interval of Bud’s work
2. Calculate the volume of 435 g block of copper.
d=m
=V=Mv =H359
8.939lcm3
48.712
3D
5. A rectangular block of lead has a mass of 1523 g. Calculate the height of the block if the
length is 4.15 cm and the width is 3.75 cm.
An nickel ore weighing 85.245 g was placed in a flask having a volume of 45.25 mL.
The flask with the nickel ore was then filled with water and weighed. The nickel ore and
the water weighed 113.571 g. The density of water is 0.9976 g/mL. Calculate the
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell