Transcript Document

Density questions
TAKS formula chart
Density formula is here.
Finding volumes of regular objects
and irregular objects.
1) Measure the volume
of liquid in a partially
filled graduated
cylinder,
2) Add the solid (making
sure it is submerged)
and note how the level
of the liquid goes up,
3) Measure the combined
volume of the solid and
liquid. The difference
between the initial and
final volumes is the
volume of the solid.
http://www.syvum.com/cgi/online/serve.cgi/members/gillilandd/quizzes/density.tdf
Try this hyperlink’s 10 questions to see if you understand the concept of density.
Metal
Density
Gold
19.3
Silver
10.5
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to
12.7
14ct
12.9 to
14.6
18ct Yellow
15.2 to
15.9
18ct White
14.7 to
16.9
22ct
17.7 to
17.8
Sterling Silver
10.2 to
10.3
950 Platinum
20.1
Density less than ‘1’ floats on water.
Density more than ‘1’ sinks in water.
What is the mass of a 600.00 mL sample of
seawater with a density of 1.025 g/mL?
• 781.25 g
• 615.0 g
• 585.4 g
D=m÷v
1.025 = ? ÷ 600
• 0.002 g
1.025 x 600 = ? ÷ 600 x 600
= 0.0017
volume
What is the density at 20oC of 16.0 milliliters
mass
of a liquid that has a mass of 3.05 grams?
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5.25 g/mL
48.8 g/mL
0.191 g/mL
0.320 g/mL
3.05 / 16 = .1906
• A sample of an element has a volume of
68.0 mL and a density of 1.85 g/mL. What
is the mass in grams of the sample?
1.85 x 68 = 125.8 grams
A block of maple wood with a volume of 8.05
cubic centimeters and a density of 0.67
g/cm3 is sawed in half. The density of the
two smaller blocks is now—
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One fourth the original density.
The same as the original density.
One half the original density.
Two times the original density.
Which of the following objects will float in water?
The one who’s density is less than 1.
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a cube with a mass of 25 g and a volume of 20 mL
a cube with a mass of 36 g and a volume of 35 mL
a pyramid with a mass of 29 g and a volume of 32 mL
a pyramid with a mass of 28 g and a volume of 26 mL
If the properties of water were to
change so that the solid form was
denser than the liquid form,
organisms living in a cold pond
environment would be less likely to
survive because water would no
longer –
●Dissolve enough oxygen from the air.
●Produces solutions containing vital
nutrients.
●Remain neutral, instead becoming
highly acidic.
●Produce a floating insulation layer of
ice.
The table shows the physical
properties of selected metals.
A cube of an unknown metal has
a volume of 2.25 cm3 and a
mass of 16.2 g. Based on data
in the table above, what is the
identity of this metal?
A. bismuth. Mass / volume= density 16.2/2.25 = 7.2
B. chromium.
C. polonium.
D. ruthenium.
Use this hyperlink to practice doing
more density problems.
Have a calculator handy.
Click on 'New Problem'
http://www.psigate.ac.uk/newsite/re
ference/chemlecs/densitycs.html