Density Applications
Calculating Density
Lab Equipment
Difficult Density Calculations
A Bit of This, A Bit of That
100
Liquid Density If each of these four liquids A 0.89 have a volume of 5 ml, what B 1.64 can you infer about the C 0.83 density of liquid B if you had D 0.77 10 ml of it?
The density would be the same.
100
What is the formula for finding the density of something?
D = M/V
100
This tool is used to measure the mass of a substance.
triple beam balance
100
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
2.7 g/mL
100
If two substances have the same volume, but the first one has greater mass, which one will have the greater density?
The first one because if density = m/v, and the first one has more mass, this would make the density greater.
200
If there are two liquids, A and B, in a beaker and B is floating on top of A, what is true about their density?
B is less dense than A
200
If the density of water is 1 gram/cm3, this means that the mass of 10 cm3 of water should be...
100 grams
200
This tool is used to measure the length, width, and height of a cube
a ruler
200
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.
13.6 g/mL
200
Glass jars are much more dense than plastic jars. What can you guess about the mass, size, and arrangement of the molecules that make up glass compared to the molecules that make up plastics?
atoms that are close together which would give glass a higher density.
300
If two samples of H2O have different densities, what is true about the samples...think state of matter.
The state of matter is different. For example, one might be ice and the other might be liquid water.
300
You have a rock with a volume of 15cm3 and a mass of 45 g. What is its density?
3 g/cm3
300
This tool is used in the water displacement method to measure the volume of an irregular-shaped item.
graduated cylinder
300
What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.
157.8 g
300
What is the volume of an object that made the water level rise in a graduated cylinder from 50 mL to 59 mL?
9 mL
400
Alcohol is less dense than water. If you measured the mass of the same volume of alcohol and water then the mass of the water would...
be lower than the alcohol
400
You decide you want to carry a boulder home from the beach. It has a volume of 27,000 cm3. It is made of granite, which has a typical density of 2.8 g/cm3. How much will this boulder weigh?
75,600 grams
400
This tool has a spout, is shaped like a cylinder, and can hold liquids or solids.
a beaker
400
A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?
8.92 g/cm3
400
Will different volumes of water always have the same density? Why or why not?
They should if their temperatures are the same. The amount of water doesn’t matter but the temperature does.
500
A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old science book and look up gold in the mineral table, and read that its density is 19.3 g/cm3. You measure the cube and find that it is 2 cm on each side, and weighs 40 g. What is its density? Is it gold? Should you buy it?
The density is 5. It is not gold. NO!
500
Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,000 kilograms (about 2 tons) in order not to be shifted by waves, how big (what volume) does it need to be? You are using basalt, which has a typical density of 3200 kg/m3.
the volume will be 0.625 m3
500
This tool is used to carry liquids. It has a wide bottom and a narrow top.
Erlenmeyer Flask
500
A flask that weighs 345.8 g is filled with 225 mL of carbon tetrachloride. The weight of the flask and carbon tetrachloride is found to be 703.55 g. From this information, calculate the density of carbon tetrachloride.
1.59 g/mL
500
Will an object with a density of 0.86 g/cm3 sink or float in water? How do you know?
It will float because its density is less than the density of water, which is 1 g/cm3.
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