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The Learning Station
Science Grade 8
Density
This learning station is to be completed ion your computer and posted on the
wiki.
1. Reminder: Density is the amount of mass in a certain volume of a
substance.
Use the densities given in the table below to answer the following questions.
Fluid
Density (g/mL)
Solid
Density (g/mL)
(Note that 1 cm3 is equivalent to 1 mL)
Helium
0.0002
Wood (Western red cedar)
0.37
Nitrogen
0.00125
Wood (Birch)
0.66
Air
0.0013
Sugar
1.59
Oxygen
0.0014
Salt
2.16
Carbon dioxide
0.002
Aluminium
2.70
Isopropanol
0.79
Iron
7.87
Vegetable oil (Varies)
0.9
Nickel
8.90
Water
1.00
Copper
8.92
Glycerol
1.26
Lead
11.34
Mercury
13.55
Gold
19.32
2. Complete the following:
a. What is the most dense substance listed in the above table?
b. What is the least dense substance listed in the above table?
3. Complete the following:
a. Name two gases that are less dense than air.
4. Complete the following:
a. Name two objects in the table that will float on liquid mercury.
b. Name two objects that will sink if placed on liquid mercury.
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5. If three liquids: glycerol, mercury and water were placed in the same
container, in which order would you expect to find them (From top to
bottom)?
6. A block of an unknown metal is 5 cm x 3 cm x 2 cm. The block has a
mass of 235 g. Of what metal do you think the block is made? Give
reason(s) to support your answer. (Note that 1 cm3 is equivalent to 1 mL)
7. Design an experiment that will enable you to determine the density of 25cent coins, as well as the metal used to manufacture these coins. Outline
the material, the procedure and the calculations you will use to divulge the
identity of the metal. For the calculations, use fictional numbers of your
choice, for example: the mass can be 30.5 g and the volume 20 mL.
8. Find the concentration in g/mL of a solution knowing that you dissolved 2
g of solid in 250 mL of liquid.
9. Find the concentration in g/mL of a solution knowing that you dissolved 10
g of solid in 180 mL of liquid.
10. Find the concentration in g/mL of a solution knowing that you dissolved
245 mg of solid in 180 mL of liquid.
11. Find the concentration in g/mL of a solution knowing that you dissolved
300 g of solid in 5 L of liquid.
12. Find the concentration in g/L of a solution knowing that you dissolved 200
g of solid in 350 cL of liquid.
13. Find the concentration in g/L of a solution knowing that you dissolved 100
cg of solid in 8 hL of liquid.
14. Find the mass in g of a solution knowing that you used 250 mL of liquid to
get a concentration of 2 g/mL.
15. Find the mass in Kg of a solution knowing that you used 100 mL of liquid
to get a concentration of 10 g/mL
16. Find the mass in g of a solution knowing that you used 2 L of liquid to get
a concentration of 3 g/mL
17. Find the volume in mL of a solution knowing that you used 200 g of solid
to get a concentration of 5 g/mL.
18. Find the volume in L of a solution knowing that you used 55 g of solid to
get a concentration of 7.5 g/mL.
19. Find the volume in mL of a solution knowing that you used 8 decag of
solid to get a concentration of 15 g/mL.
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