Dominic made the table below to organize his notes about mixtures. what mistake did dominic make? the title should read “properties of solutions” because some mixtures do not have all of the properties listed. there is a definite recipe to make each mixture, so the composition of a mixture is set. although it is possible to have more than one state, it is also possible to have only one state. a single substance can be used to make a mixture if the substance is composed of more than one element.

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.