In water conservation, chemists spread a thin film of a certain inert material over the surface of water to cut down on the rate of evaporation of water in reservoirs, this technique was pioneered by benjamin franklin three centuries ago. franklin found that 0.10 ml of oil could spread over the surface of water of about 40 m2in area. assuming that the oil forms a monolayer, that is, a layer that is only one molecule thick, estimate the length of each oil molecule in nanometers.
extremely tiny clusters of atoms or molecules are often called nano-particles due to the small scale of their dimensions. the specific gravity of gold is 19.3 and the mass of one gold atom is 197 amu (where 1 amu = 1.66 x 10-24g). calculate the number of gold atomsin a sphere-shaped nano-particle of gold that is 2.00 nanometers in diameter. [hint: recall that the volume of a sphere is (4/3)πr3where r is the sphere's radius and π= 3.1416.]
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The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.
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In water conservation, chemists spread a thin film of a certain inert material over the surface of w...
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