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. ]
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How might you cause an endothermic chemical change to begin and keep going?
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Updated 10/4/2011 9:11:10 PM
hahaha
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
Volume = L*W*H
So V= 15.3*9*4.5 = 619.65
How can you determaane wether a solid object is dense or less dense than water?
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Updated 5/10/2010 12:34:25 AM
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

The density of a solid material can be ambiguous, depending on exactly how its volume is defined, and this may cause confusion in measurement. A common example is sand: if it is gently poured into a container, the density will be low; if the same sand is compacted into the same container, it will occupy less volume and consequently exhibit a greater density. This is because sand, like all powders and granular solids, contains a lot of air space in between individual grains. The density of the material including the air spaces is the bulk density, which differs significantly from the density of an individual grain of sand with no air included

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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