Worksheet Chapter 2-3 - Key
Name ________________
Period # ___
SHOW YOUR WORK ON CALCULATIONS 1 – 5.
1.
What is the density of a piece of cork that has a mass of
0.650g and a volume of 2.71cm3?
D = 0.650g ÷ 2.71cm3 = 0.23985g/cm3 = 0.240g/cm3
2.
Barium perchlorate has a density of 2.74g/cm3.
What is the mass of 27.2cm3 of this substance?
M = (2.74g/cm3)(27.2cm3) = 74.528g = 74.5g
3.
Bismuth phosphate has a density of 6.32g/cm3.
What is the mass of 25.9L of this substance?
25.9L = 25,900cm3
M = (6.32g/cm3)(25,900cm3) = 163688g = 164,000g
4.
Cerium sulfate has a density of 3.17g/cm3.
What is the volume of 599g of this substance?
V = 599g ÷ 3.17g/cm3 = 188.95899cm3 = 189cm3
5.
Chromium sulfide has a density of 5.50g/cm3.
What is the volume of 35.9kg of this substance?
35.9kg = 35,900g
V = 35,900g ÷ 5.50g/cm3 = 6527.27cm3 = 6530cm3
6.
What weighs more a pound of feathers or a pound of lead?
They both weigh the same (1 pound).
7.
What is different between the pound of feathers and the
pound of lead?
A pound of lead would take up less space and be more dense than a pound of feathers.
8.
The density of an object is the mass of a unit volume, usually
one cubic centimeter, of the material of which the object is
made. A solid piece of copper and a solid piece of aluminum
have the same mass. If the density of copper is 8.9 grams/cm 3
and the density of aluminum is 2.7 grams/cm3, which of the
following statements is true:
a. Both objects will have the same volume.
b. The volume of the copper piece is larger than that of the
aluminum piece.
c. The volume of the aluminum piece is larger than that
of the copper piece.
d. Not enough information is provided in order to compare
the two volumes.
9.
Four solid objects are made from the same exact plastic
material. The density of the plastic material is 0.95 grams/cm3.
Object A weighs 0.5 lbs, object B weighs 1 lbs, object C
weighs 10 lbs and object D weighs 1000 lbs. If density of
water is 1.0 grams/cm3, which one of the following statements
is true?
a. Only A & B will float
b. Only object A will float
c. All objects will float
d. All objects will sink.
IN PROBLEMS 10-16 ROUND EACH OF YOUR ANSWERS TO THE CORRECT
NUMBER OF SIGNIFICANT DIGITS.
10.
(10.18m)(0.00740m) = 0.075332m2 = 0.0753m2
11.
(302,000mm)(3.5mm) = 1,057,000mm2 = 1,100,000mm2
12.
3120.14g ÷ 4.2 L = 742.89g/L = 740g/L
13.
701.2g + 4.24g + 57.397g = 762.837 = 762.8g
14.
9.662kg – 0.25692kg = 9.40508kg = 9.405kg
15.
(2.63 x 10-9cm)(5 x 103cm) = 1.315 x 10-5 = 1 x 10-5 cm2
16.
(6.12 x 102ml)(4.92 x 103ml) ÷ (8.4 x 10-7ml)
= 3.58457 x 1012 = 3.6 x 1012ml