Review+3+density

Name: Date: 8th Grade Science – STEM Middle Academy – Mr. Condon Block:

Review #3 for Test on Density and Scientific Method
 * 1) A company has made a new material for insulating houses. The material has a density of 0.057g/cm3. A truck is loaded with 50,000cm3 of this material. What would be the final **density** of the material on the truck? (Do not count the truck)


 * 1) The material mentioned in the question above is then cut into 13 inch wide sections and installed in the walls of a house being constructed. What is the **density** of the material placed in these walls?


 * 1) If 3000 cm3 of this new insulating material (D=0.057g/cm3) is needed to fill the space in the walls, how much mass is added to the walls? **Show your work**.


 * 1) When making milk, dairy workers say “the cream always rises to the top.” If the density of milk is 1.4 g/cm3, what is the density of cream?

a. source of error b. percent error c. amount of error
 * 1) When calculating density, the difference between your answer and that tested by scientists many times is called . ..


 * 1) Which would provide a more accurate measure of 6ml. of a liquid, a 100ml. beaker or a 10ml. graduated cylinder?

a. curve b. meniscus c. liquid d. cylinder
 * 1) When using a graduated cylinder, you measure the volume at the bottom of the ..


 * 1) Mass is most accurately measured with a . ..
 * 2) `metric ruler b. triple beam balance c. electric scale


 * 1) Why is density a better property of matter to use to identify a material than mass or volume?
 * 2) In 1849 gold was discovered near Sutter’s Mill in California. Americans flocked to the state with a simple tool, a miner’s pan. Miners would scoop up sand from the bed of rivers throughout the state and swirl it with water. Slowly, the sand would wash from the pan and all that would be left was gold. This simple tool worked because gold is more  than sand.


 * 1) The formula for calculating tne volume of a cylinder is: V = p r2h. If you had a cylinder with a radius of 4.1 cm and a height of 8.0 cm, what would be its volume to the correct number of significant digits? **Show your work**.


 * 1) If the above mentioned cylinder has a mass of 50 grams, what would be the density of the cylinder? **Show your work**.


 * 1) You have another cylinder with the exact same dimensions but a mass of 100 grams. Does it have a higher or lower density?


 * 1) Before the Big Bang, it was thought that all the universe’s matter was contained in an infinitely small area. What then was the density of the universe prior to the Big Bang?


 * 1) Some scientists believe that universe will continue to expand for its entire existence. As its volume increases, what happens to its density?


 * 1) In the space below, diagram how the density of hot air allows for a balloon to rise.