DENSITY
Review DENSITY_COMPUTATION
slide found on the SCIENCE weebly
site. Graded Worksheet tom.
DENSITY = MASS / VOLUME
DENSITY= grams/ mL or kg/L
VOLUME= MASS / DENSITY
MASS= DENSITY X VOLUME
Note: Higher density sinks/ stays at the bottom
and lower density stays on top/ floats.
Lowest Density = Lamp Oil
Highest Density = Honey
The substance that stays on top has the lowest density
and
he substance that stays at the bottom has the highest dens
PROBLEM I
1. What is the density of CO gas if
0.196 g occupies a volume of 100
ml?
PROBLEM II
2) Mercury metal is poured into a graduated
cylinder that holds exactly 22.5 mL. The mercury
used to fill the cylinder weighs 306.0 g. From
this information, calculate the density of
mercury.
PROBLEM III
3. An irregularly shaped stone was
lowered into a graduated cylinder
holding a volume of water equal to 2
ml. The height of the water rose to 7
ml. If the mass of the stone was 25
g, what was its density?
PROBLEM IV
4. Silver has a density of 10.5
grams/cm3 and gold has a density
of 19.3 g/cm3. Which would have
the greater mass, 5cm3 of silver or
5cm3 of gold?
PROBLEM V
5. Five mL of ethanol has a mass of
3.9 g, and 5.0 mL of benzene has a
mass of 44 g. Which liquid is
denser?
DENSITY OF WATER = 1 g/mL
FORMULA
MASS
VOLUME
DENSITY
SINK/FLOAT
?
30 grams
80 mL
?
?
1
II
6 mL
2.5 g/mL
III
IV
50 grams
V
0.5 g/mL
VI
VII
77 grams
140 mL
VIII
IX
X
XI
38 mL
4.5 g/mL
XII
PROBLEM I
1. What is the density of CO gas if 0.196 g
occupies a volume of 100 ml?
Density= Mass/ Volume
Density= 0.196g / 100 mL
Density= 0.00196 g/ mL
PROBLEM II
2) Mercury metal is poured into a graduated
cylinder that holds exactly 22.5 mL. The mercury
used to fill the cylinder weighs 306.0 g. From
this information, calculate the density of
mercury.
Density= Mass / Volume
Density= 306 g/ 22.5 mL
Density= 13.6 g/ mL
PROBLEM III
3. An irregularly shaped stone was lowered into
a graduated cylinder holding a volume of water
equal to 2 ml. The height of the water rose to 7
ml. If the mass of the stone was 25 g, what was
its density?
Density= Mass / Volume
Density= 25 g/ (7 mL - 2 mL) = 25 g/ 5 mL
Density= 5 g/ mL
PROBLEM IV
4. Silver has a density of 10.5 grams/cm3 and
gold has a density of 19.3 g/cm3. Which would
have the greater mass, 5cm3 of silver or 5cm3
of gold?
Mass= Density x Volume
Mass (silver)= 10.5 g/cm3 x 5 cm3= 52.5 cm3
Mass (gold)= 19.3 g/ cm3 x 5 cm3= 96.5 cm3
(greater)
PROBLEM V
5. Five mL of ethanol has a mass of 3.9 g, and
5.0 mL of benzene has a mass of 44 g. Which
liquid is denser?
Density= Mass / Volume
Density ethanol = 3.9 g/ 5 mL= 0.78 g/mL
Density benzene = 44 g/ 5 mL= 8.8 g/mL
Benzene is denser than ethanol.
DENSITY OF WATER = 1 g/mL
FORMULA
MASS
VOLUME
DENSITY
SINK/FLOA
T
D=M/V
30 grams
80 mL
0.375 g/mL
float
M=D x V
15 grams
6 mL
2.5 g/mL
sink
V= M/D
50 grams
100 mL
0.5 g/mL
float
D=M/V
77 grams
140 mL
0.55 g/mL
float
M=D x V
171 grams
38 mL
4.5 g/mL
sink