Density Notes & Practice Problems
[ ] - ratio that compares the mass of an object to its volume
โIndicates how โ[ ]โ an object is.
โIts units include [ ] and [ ].
โFormula for calculating density:
Example:
โA piece of metal with a mass of 147 g is placed in a 50-mL graduated cylinder. The water level rises from 20 mL
to 41 mL. What is the density of the metal?
[ ]
Practice Problems:
1. Suppose a sample of aluminum is placed in a 25-mL graduated cylinder containing 10.5 mL of water. The level
of the water rises to 13.5 mL. What is the mass of the aluminum sample? (The density of aluminum is 2.7 g/cm3.)
[ ]
2. What is the volume of a sample that has a mass of 20 g and a density of 4 g/mL?
[ ]
3. A metal cube has a mass of 20 g and a volume of 5 cm3. Is the cube made of pure aluminum? Explain your
answer. (The density of aluminum is 2.7 g/cm3.)
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4. A 2.00-mL sample of substance A has a density of 18.4 g/mL and a 5.00-mL sample of substance B has a density
of 35.5 g/mL. Do you have an equal mass of substances A and B?
[ ]
**The Density Practice Problems on the next page are what you need to turn in to the Dropbox.**
(Make sure to show all work for full credit.)
