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explain why the mass of a rusted nail would be greater than the mass of the nail before it rusted?
Rust is iron oxide, a molecule consisting of iron and oxygen. The mass of the iron in the rust molecules comes from the original nail, but the mass of the oxygen has come from the air. [ When rust forms on iron, the mass of the iron object is increased by the mass of the oxygen that has combined with some of the iron. ]
Expert answered|lamont|Points 86|
Asked 5/9/2010 5:09:43 PM
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How might you cause an endothermic chemical change to begin and keep going?
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A plastic box is 15.3 cm long, 9.0 cm wide, and 4.5 cm high. What is its volume? Includ units in your answer.
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Updated 5/9/2010 7:55:52 PM
1 Answer/Comment
Volume = L*W*H
So V= 15.3*9*4.5 = 619.65
Added 5/9/2010 7:55:52 PM
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For a homogeneous object, the mass divided by the volume gives the density. The mass is normally measured with an appropriate scale or balance; the volume may be measured directly (from the geometry of the object) or by the displacement of a fluid. Hydrostatic weighing is a method that combines these two.

If the body is not homogeneous, then the density is a function of the position: , where dv is an elementary volume at position . The mass of the body then can be expressed as

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propose a way to determaine the densilty of air?
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Updated 5/9/2010 9:05:15 PM
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