![]() ![]() For example, there are many compounds other than isooctane that also have a carbon-to-hydrogen mass ratio of 5.33:1.00.ĭalton also used data from Proust, as well as results from his own experiments, to formulate another interesting law. That is, samples that have the same mass ratio are not necessarily the same substance. It is worth noting that although all samples of a particular compound have the same mass ratio, the converse is not true in general. (In this case, atoms appear to have been destroyed.) This violates Dalton’s postulate that atoms are neither created nor destroyed during a chemical change, but are merely redistributed. The products consist of only one green sphere and one purple sphere. The starting materials consist of two green spheres and two purple spheres. Does the following chemical change represented by these symbols violate any of the ideas of Dalton’s atomic theory? If so, which one? ![]() If the spheres touch, they are part of a single unit of a compound. The purple spheres represent atoms of another element. In the following drawing, the green spheres represent atoms of a certain element. A macroscopic sample of an element contains an incredibly large number of atoms, all of which have identical chemical properties.
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