Wednesday, February 20, 2013

Density Math Questions

Density Math Questions?
I was giving a sheet with about 15 questions on it about Density but can't figure out how to get these last three questions. Can someone please answer these to help and tell me how they got it so I understand how to do them? 15 points to whoever helps me! 5. In an old trunk, you find a piece of metal that you think may be aluminum, silver or lead. In lab you find it has a mass of 217g and a volume of 19.2cm. What is the metal you have found? 7. Suppose you have two 100ml graduated cylinders. In each cylinder there are 40ml of water. You also have two cubes: one is lead and the other is aluminum. Each cube measure 2.0 on each side. After you carefully lower each into the water its own cylinder what will the new water level be in each cylinder? 8. What is the density of each of the following sample? a. A medication, if 3.00ml has a mass of 3.85g b. The Fluid in a car battery, if it has a volume of 125ml and mass of 155g c. A 5.00ml urine sample from a patient suffering from symptoms resembling those of diabetes mellitus. The mass of the urine sample is 5.025g I got Lead for number 5, I wasn't sure if it was correct though.
Chemistry - 2 Answers
Random Answers, Critics, Comments, Opinions :
1 :
Number 5 is lead.
2 :
5) you are correct, 217/19.2 is 11.3, the density of lead 7) If each cube is 2cm on each side, they will each displace 8mL or 8 cm^3 (you take 2x2x2 to get the volume) and the new volume will be 48mL. They will both sink and displace the same amount of water despite the difference in their mass. 8) 3.85/3.00= density of med. units are g/cm^3 b) 155/125= c)5.025/5= you should remember that 1 mL and 1 cm^3 are the same size, its just people tend to use mL for liquid, and cm^3 for solids and in the unit for density which is g/cm^3

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